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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

For the fiscal year ended December 31, 2004

or

For the transition period from              to             

Commission File Number: 1-14925

STANCORP FINANCIAL GROUP, INC.

(Exact name of registrant as specified in its charter)

1100 SW Sixth Avenue, Portland, Oregon, 97204

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (503) 321-7000

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: NONE

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x      No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of the 10-K or any amendment to the Form 10-K.  ¨

Indicate by check mark whether the Registrant is an accelerated filer (as defined in Rule 12b-2 of the Securities Exchange Act of 1934).    Yes  x      No  ¨

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of June 30, 2004, was approximately $1.88 billion based upon the closing price of $67.00 on June 30, 2004. For this purpose, directors and executive officers of the corporation are considered to be affiliates; the aggregate market value of their collective holdings of voting and non-voting common equity has been excluded accordingly.

As of February 25, 2005, there were 28,438,972 shares of the Registrant’s common stock, no par value, outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s definitive Proxy Statement for its 2005 Annual Meeting of Shareholders are incorporated by reference in Parts I and III.

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As used in this Form 10-K, the terms “StanCorp,” “Company,” “we,” “us” and “our” refer to StanCorp Financial Group, Inc. and its subsidiaries, unless the context otherwise requires.

AVAILABLE INFORMATION

StanCorp files its annual, quarterly and current reports, proxy statements and other information with the United States Securities and Exchange Commission (“SEC”). You may read and copy any document StanCorp files with the SEC at the SEC’s Public Reference Room at 450 Fifth Street, NW, Washington, DC 20549, U.S.A. You may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330 (or 1-202-942-8090). The SEC maintains an Internet site that contains annual, quarterly and current reports, proxy and information statements and other information regarding issuers that file electronically with the SEC. StanCorp’s electronic SEC filings are available to the public at www.sec.gov.

StanCorp’s Internet site for investors is www.stancorpfinancial.com/investors. StanCorp makes available free of charge through its Internet site its annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as soon as reasonably practicable after it electronically files such material with, or furnishes it to, the SEC.

StanCorp also makes available on www.stancorpfinancial.com/investors (i) its Corporate Governance Guidelines, (ii) its Codes of Business Ethics (including any waivers therefrom granted to executive officers or directors), and (iii) the charters of the Audit, Organization and Compensation, and Nominating and Corporate Governance Committees of its Board of Directors. These documents are also available in print without charge to any person who requests them by writing or telephoning:

Shareholder Relations Department

StanCorp Financial Group, Inc.

1100 SW Sixth Avenue

Portland, OR 97204

(800) 378-8360

FORWARD-LOOKING STATEMENTS

Some of the statements contained or incorporated by reference in this Annual Report on Form 10-K, including those relating to the Company’s strategy and other statements that are predictive in nature, that depend upon or refer to future events or conditions, or that include words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “estimates” and similar expressions, are forward-looking statements within the meaning of Section 21E of the Exchange Act. These statements are not historical facts but instead represent only management’s expectations, estimates and projections regarding future events. These statements are not guarantees of future performance and involve certain risks and uncertainties that are difficult to predict, which may include, but are not limited to, the factors listed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Forward-looking Statements” in Part II, Item 7, of this Report.

As a provider of financial products and services, our results of operations may vary significantly in response to economic trends, interest rate changes, investment performance and claims experience. Caution should be used when extrapolating historical results to future periods. Our actual results and financial condition may differ, perhaps materially, from the anticipated results and financial condition in any forward-looking statements and, accordingly, readers are cautioned not to place undue reliance on such statements. We undertake no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

GENERAL

StanCorp is a leading provider of employee benefit products and services serving the life and disability insurance needs of employer groups and individuals. Through our subsidiaries, we have the authority to underwrite insurance products in all 50 states. We also provide accidental death and dismemberment (“AD&D”) and dental insurance, annuity products and retirement plan products and services. Our mortgage business originates and services small fixed-rate commercial mortgage loans for the investment portfolios of our insurance subsidiaries and for sale to institutional investors. We operate through three segments: Employee Benefits, Individual Insurance, and Retirement Plans, each of which is described below.

MISSION AND STRATEGY

Our mission is to exceed customers’ needs for financial products and services in growing markets where the application of specialized expertise creates potential for superior shareholder returns. Our vision is to lead the financial services industry in service, in expertise, and in doing what matters for customers. We operate in select financial product and services growth markets and seek to

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compete on expertise, differentiation, and customer service, while maintaining a strong financial position.

StanCorp’s strategy includes:

Our ability to accomplish this strategy is dependent on a number of factors, some of which involve risks or uncertainties that we are unable to predict. See “Competition” and “Critical Factors Affecting Results of Operations,” below, and “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Forward-looking Statements” in Part II, Item 7, of this Report for further information.

DEVELOPMENT OF STANCORP

We were incorporated under the laws of Oregon in 1998. We conduct business through our subsidiaries, Standard Insurance Company (“Standard”); The Standard Life Insurance Company of New York; StanCorp Mortgage Investors, LLC (“StanCorp Mortgage Investors”); StanCorp Investment Advisers, Inc. (“StanCorp Investment Advisers”); and StanCorp Equities, Inc. We are headquartered in Portland, Oregon.

Standard, our largest subsidiary, underwrites group and individual disability insurance and annuity products, group life, AD&D, and dental insurance. Founded in 1906, Standard is domiciled in Oregon and licensed in 49 states, the District of Columbia and the U.S. Territories of Guam and the Virgin Islands. Standard expanded its business in 2000 by reinsuring a block of individual disability insurance business from Minnesota Life Insurance Company (“Minnesota Life”), and in 2002 by reinsuring a block of group life and disability business from Teachers Insurance and Annuity Association of America (“TIAA”).

The Standard Life Insurance Company of New York was organized in 2000, and is licensed to provide long term and short term disability, life, AD&D, and dental insurance for groups in New York.

StanCorp Investment Advisers is a SEC registered investment adviser providing performance analysis, fund selection support, and model portfolios to our retirement plan clients and other third parties. It also provides investment management services to third parties and subsidiaries of StanCorp.

StanCorp Mortgage Investors originates and services small fixed-rate commercial mortgage loans for investment portfolios of our insurance subsidiaries. It also generates additional fee income from the origination and servicing of commercial mortgage loans sold to institutional investors.

StanCorp Equities, Inc. is a licensed broker-dealer. For the sale of registered contracts, a broker-dealer must serve as principal underwriter and distributor, providing supervision and oversight that is required by the National Association of Securities Dealers. Standard has developed a registered contract to expand its market to 403(b) plans, 457 tax exempt plans, and nonqualified deferred compensation plans of private employers. StanCorp Equities, Inc. will act as the principal underwriter and distributor of registered contracts for Standard. In February of 2005, the registered contracts became available for sale.

MARKET POSITION

Based on 2004 insurance industry in force premium statistics in the United States, provided by John Hewitt & Associates and LIMRA International, we have leading market positions, with single digit market share in these product lines:

FINANCIAL STRENGTH RATINGS

Financial strength ratings, which rate claims paying ability, are an important factor in establishing the competitive position of insurance companies. Ratings are important in maintaining public confidence in our company and in our ability to market our products. Rating organizations continually review the financial performance and condition of insurance companies, including our company. In addition, our debt ratings on our senior notes are tied to our financial strength ratings. A ratings downgrade could increase our surrender levels, adversely affect our ability to market our products, and also could increase future debt costs. Financial strength ratings are based primarily on statutory financial information. Standard & Poor’s, Moody’s Investors Service, Inc., Fitch, Inc., and A.M. Best Company provide assessments of our overall financial position.

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Standard’s financial strength ratings as of February 2005 were:

SEGMENTS

We operate through three segments: Employee Benefits, Individual Insurance, and Retirement Plans. Measured as a percentage of total revenues, revenues for each of our three segments for the year ended December 31, 2004 were 84.5% for Employee Benefits, 9.7% for Individual Insurance and 4.0% for Retirement Plans. See Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Consolidated Results of Operations—Revenues—Premiums” and Item 8, “Financial Statements and Supplementary Data—Notes to Consolidated Financial Statement—Segments.”

Employee Benefits Segment

The Employee Benefits segment sells disability, life, AD&D and dental insurance products to employer groups ranging in size from two lives to over 180,000 lives, and has more than 29,500 group insurance policies in force, covering about 6.7 million employees as of December 31, 2004.

Our group insurance products are sold by sales representatives through independent employee benefit brokers and consultants. The sales representatives, who are employees of the Company, are compensated through salary and incentive compensation programs and are located in 42 field offices in principal metropolitan areas of the United States. The field offices also provide sales support, customer service and limited underwriting through a field administrative staff. The Company’s arrangements with brokers include compensation earned at the time of sale, and, in some situations, also include compensation related to the overall performance of a block of business (performance related compensation). In most cases, the overall performance of a block of business is measured in terms of volume and persistency (customer retention).

Group long term disability insurance contributed approximately 46% of 2004 premiums for the segment. Group long term disability insurance provides partial replacement of earnings to insured employees who become disabled for extended periods of time. The Company’s basic long term disability product covers disabilities that occur during the policy period both at work and elsewhere. In order to receive disability benefits, an employee must be continuously disabled for a specified waiting period, which generally ranges from 30 to 180 days. The benefits usually are reduced by other income that the disabled employee receives from sources such as social security disability, workers compensation, and sick leave. The benefits also may be subject to certain maximum amounts and benefit periods. Historically, approximately 50% of all claims filed under our long term disability policies close within 24 months. However, claims caused by more severe disabling conditions may be paid over much longer periods, including up to normal retirement age or longer.

Generally, group long term disability policies offer rate guarantees for periods from one to three years. While we can prospectively re-price and re-underwrite coverages at the end of these guarantee periods, we must pay benefits with respect to claims incurred during these periods without being able to increase guaranteed premium rates.

Group life and AD&D insurance contributed approximately 39% of 2004 premiums for the segment. Group life insurance products provide coverage to insured employees for a specified period and have no cash value (amount of cash available to an insured employee on the surrender of, or withdrawal from, the life insurance policy). Coverage is offered to insured employees and their dependents. AD&D insurance is usually provided in conjunction with group life insurance, and is payable after the accidental death or dismemberment of the insured in an amount based on the face amount of the policy or dismemberment schedule.

Group short term disability insurance contributed approximately 11% of 2004 premiums for the segment. Group short term disability insurance provides partial replacement of earnings to insured employees who are disabled. Short term disability insurance generally requires a short waiting period, ranging from one to 30 days, before an insured employee may receive benefits. Maximum benefit periods generally do not exceed 26 weeks. Group short term disability benefits also may be reduced by other income, such as sick leave, that a disabled insured employee may receive. Our basic short term disability products generally cover only non-occupational disabilities.

Group dental insurance contributed approximately 4% of 2004 premiums for the segment. Group dental products provide coverage to insured employees and their dependents for preventive, basic and major dental expenses, and an option to purchase orthodontia benefits. We offer three dental plans including a traditional plan, a reduced cost plan and a cost containment plan, which are differentiated by the levels of service and cost. Standard has a strategic marketing alliance with Ameritas Life Insurance Corp. (“Ameritas”), which offers Standard’s policyholders flexible dental coverage options and access to Ameritas’ nationwide preferred provider organization panel of dentists.

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Individual Insurance Segment

The Individual Insurance segment sells disability insurance and fixed-rate annuities to individuals. Our disability insurance products are sold nationally through master general agents and brokers, primarily to physicians, lawyers, executives, other professionals and small business owners. The compensation paid to master general agents and brokers consists primarily of a percentage of premiums. Master general agents and some brokers are eligible for a bonus based on sales volume and persistency of business written by them. This segment also sells business overhead expense coverage, which reimburses covered operating expenses when the insured is disabled, and business equity buy-out coverage, which provides funds for the purchase, by other owners or partners, of the insured’s ownership interest in a business in the event of total disability. Non-cancelable policies, guaranteeing the customer a fixed premium rate for the life of the contract, represented 88% of sales based on annualized new premiums for 2004.

Fixed-rate annuities are distributed through master general agents, brokers, and financial institutions. The compensation paid to master general agents, financial institutions, and brokers consists primarily of a percentage of premiums and deposits. Master general agents are eligible for a bonus based on the volume of annuity business sold by the financial institutions and brokers. The target market is any individual seeking conservative investments to meet their retirement or other financial goals. The fixed-rate annuity product portfolio includes deferred annuities with initial interest rate guarantees generally ranging from one to six years and a full array of single premium immediate annuity income payment options.

Retirement Plans Segment

The Retirement Plans segment offers full-service 401(k), 457, defined benefit, money purchase pension, and profit sharing plan products and services to small and medium sized employers. Subsequent to December 31, 2004, this segment began offering 403(b) and non-qualified deferred compensation products through an affiliated broker-dealer. Our 401(k) product, which is our primary retirement plan product, offers participants a stable value investment option, managed by Standard, and third-party brand name mutual funds through a separate account. Mutual funds offered as of December 31, 2004 are from ABN AMRO, AMR Investments, American Century, Brandywine, California Investment Trust, Davis New York, Dodge and Cox, Federated, Fidelity, Franklin Templeton, GE, Harbor, Harris, Hotchkis and Wiley, JP Morgan, Munder, Neuberger Berman, Oppenheimer, PIMCO, Rainier, Sterling, T. Rowe Price, TCW Galileo, UMB Scout, Vanguard, and William Blair. Funds offered in our retirement plans are continuously evaluated for performance, expense ratios, risk statistics, style consistency, industry diversification and management through the investment advisory service we provide to our customers. Funds are added and removed as part of this evaluation process. Approximately 80% of plan sponsors use StanCorp Investment Advisers to provide fund performance analysis and selection support.

The Retirement Plans segment sells products and services primarily through brokers, employee benefit consultants, and other distributors served by our sales representatives throughout the United States. Brokers are compensated based on a percentage of the combination of deposits and assets. Generally, compensation is disclosed to the customer by the Company. Most of our retirement plan customers receive financial, record-keeping and administrative services, although financial services only or financial and record-keeping services only are also available.

The primary sources of revenue for the Retirement Plans segment include plan administration fees, fees on separate account assets under management, and investment margin on general account assets under management, which is a fixed-income investment option. The investment margin is the excess of net investment income over related interest credited to policyholders. In addition, premiums and benefits to policyholders reflect the conversion of retirement plan assets into life contingent annuities, which can be selected by plan participants at the time of retirement.

In two recent surveys for 2004, the Retirement Plans segment was recognized as an outstanding 401(k) provider. It earned 32 Best in Class awards in PLANSPONSOR magazine’s 2004 defined contribution plan survey, almost doubling last year’s total of 18 awards, and more than any other company in the survey with plans under $50 million in assets. In the Boston Research Group’s 2004 survey of small defined contribution plans under $5 million in assets, Standard was rated number one in terms of overall satisfaction by plan sponsors, beating out all other providers in the categories of overall satisfaction, employee education, participant Web site, recordkeeping, ERISA services, telephone representatives, and satisfaction with relationship manager and plan coordinator.

Other

In addition to our three segments, we conduct other financial service businesses that are generally non-insurance related. These include StanCorp Mortgage Investors, our commercial mortgage lending business, and StanCorp Investment Advisers, our registered investment adviser. This

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category also includes net capital gains and losses on investments, return on capital not allocated to the product segments, other financial service businesses, holding company expenses, interest on senior notes and adjustments made in consolidation.

COMPETITION

Competition for sale of our products comes primarily from other insurers and financial services companies such as banks, broker-dealers, and mutual funds. Some competitors have greater financial resources, offer a broader array of products, and may have higher financial strength ratings. Pricing is a competitive issue in the markets we serve. We do not seek to compete primarily on price. While we believe our products and service provide superior value to our customers, a significant price difference between our products and those of some of our competitors may result in periods of declining new sales, reduced persistency (customer retention), lower premium growth, and increased sales force attrition. See “Critical Factors Affecting Results of Operations—Pricing.”

CRITICAL FACTORS AFFECTING RESULTS OF OPERATIONS

Group employee benefits insurance (our Employee Benefits segment) is our largest business and represented 92.7%, 93.2% and 92.8% of total premiums for the years ended December 31, 2004, 2003 and 2002, respectively. In addition to competition, three factors can have a critical impact on the financial results of our Employee Benefits operations: claims experience, economic conditions and pricing.

Claims experience. We have a large and well-diversified group insurance business. However, short term fluctuations in our claims experience can cause our financial results to be volatile when measured on a quarterly basis.

Economic Conditions. The rate of wage and employment growth can influence premium growth in our Employee Benefits segment. In addition, our financial results are sensitive to changing interest rates and their effect on product pricing because premiums collected today must be invested to provide a return sufficient to meet the future claims of policyholders. For that reason, we closely monitor changes in interest rates and make changes to our pricing, as appropriate. Interest rates also affect the discount rates we use to establish reserves.

Pricing. One of the key components of our pricing decisions for our insurance products is the investment return available to us. In periods of decreasing interest rates, the returns available to us from our primary investments, fixed maturity securities and commercial mortgage loans, decline. This requires us to increase the price of some of our products in order to maintain our targeted returns. If our competitors do not make similar adjustments to their product pricing or if they have a higher return on investments, our products may be more expensive than those offered by competitors. Alternatively, in periods when interest rates are increasing, we can reduce premium rates, and therefore reduce pricing pressure to customers. Given the cyclical nature of interest rates and the negative financial consequences of under-pricing, we believe that our practice of maintaining a disciplined approach to product pricing provides the best long term pricing stability, stable renewal pricing for our customers, higher levels of persistency, and therefore, the best long term financial success for our company.

RISK MANAGEMENT

We manage risk through sound product design and underwriting, effective claims management, disciplined pricing, distribution expertise, broad diversification of risk by customer geography, industry, size and occupation, maintenance of a strong financial position, maintenance of reinsurance and risk pool arrangements, and sufficient alignment of assets and liabilities to meet financial obligations.

Diversification of Products

We achieve earnings diversification by offering insurance products such as group life, group long term disability, and individual disability products. These products have differing price, market and risk characteristics. We plan to further diversify our earnings so that income before income taxes from other products such as group dental, individual fixed-rate annuities, retirement plans, investment management and commercial mortgage loan originations constitute approximately 25% of income before income taxes. We plan to accomplish this diversification in a disciplined fashion over the next few years through continued growth in these businesses and consideration of acquisitions in these businesses that fit our mission statement and return objectives.

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Diversification of Customer Industry, Geography and Size

We seek to diversify risk by customer industry, geography and size measured by the number of insured employees. In force premium distribution by industry, geography, and customer size for group long term disability and group life products was as follows as of December 31, 2004:

Reinsurance

In order to limit our losses from large exposures, we enter into reinsurance agreements with other insurance companies. During 2004, we reviewed our retention limits and, based on our current size and recent experience, increased our maximum retention limits for our group and individual disability and group life and AD&D contracts. Effective October 1, 2004, we increased our maximum retention limits per individual for group life and AD&D combined from $500,000 to $750,000. Our maximum retention for group disability insurance increased from $10,000 to $15,000 monthly benefit per individual. Except for certain policies in the block of business we assumed from Minnesota Life, our maximum retention increased generally from $3,500 to $5,000 monthly benefit per individual for individual disability policies with effective dates on or after October 1, 2004. On certain Minnesota Life business, we have a maximum retention of $6,000 monthly benefit per individual.

Standard participates in a reinsurance and third party administration arrangement with The Northwestern Mutual Life Insurance Company (“Northwestern Mutual”) under which group long term and short term disability products are sold using Northwestern Mutual’s agency distribution system. Generally, Standard assumes 60% of the risk, and receives 60% of the premiums for the policies issued. Premiums assumed by Standard for the Northwestern Mutual business accounted for 3.5%, 3.5%, and 3.6% of the Company’s total premiums for 2004, 2003, and 2002, respectively. In addition to assuming risk, Standard provides product design, pricing, underwriting, legal support, claims management, and other administrative services under the arrangement. If Standard were to become unable to meet its obligations, Northwestern Mutual would retain the reinsured liabilities. Therefore, in accordance with an agreement with Northwestern Mutual, Standard established a trust for the benefit of Northwestern Mutual with the market value of assets in the trust equal to Northwestern Mutual’s reinsurance receivable from Standard. The market value of assets required to be maintained in the trust at December 31, 2004 was $200.1 million.

During 2002, Standard formed a strategic marketing alliance with Ameritas that offers Standard’s policyholders new and more flexible dental coverage options and access to Ameritas’ nationwide preferred provider organization panel of dentists. As part of this alliance, Standard and Ameritas entered into a reinsurance agreement that provides for approximately 15% of the net dental premiums written by Standard and the risk associated with these premiums, to be ceded to Ameritas.

In addition to product-specific reinsurance arrangements, we maintain reinsurance coverage for certain catastrophe losses related to group life and AD&D. Through a combination of our participation in a catastrophe reinsurance pool and a catastrophe reinsurance agreement, we have coverage of up to approximately $300 million per event.

Catastrophe Reinsurance Pool

Subsequent to the terrorist events of September 11, 2001, the availability of reinsurance for catastrophe coverage became less certain and more expensive. Accordingly, we entered into a catastrophe reinsurance pool with other insurance companies. This pool spreads catastrophe losses on group life and AD&D over approximately 35 participating members. The annual fees paid by the Company to participate in the pool and claims to date have been minor. As a member of the pool, we are exposed to potential losses experienced by other participating members of approximately $65 million for a single event for losses submitted by a single company, and approximately $160 million for a single

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event for losses submitted by multiple companies. If we had been a member of the pool on September 11, 2001, the estimated pre-tax charges related to the terrorist events would have been approximately $15 million compared to pre-tax charges of $5 million incurred. The Company’s percentage share of losses experienced by pool members will change over time as it is a function of our group life and AD&D in force relative to the total group life and AD&D in force for all pool participants. The reinsurance pool does not exclude war, or nuclear, biological and chemical acts of terrorism.

Catastrophe Reinsurance Agreement

Effective October 1, 2004, we maintain reinsurance coverage for catastrophe losses related to group life and AD&D through a catastrophe reinsurance agreement. This agreement excludes nuclear, biological and chemical acts of terrorism.

The Terrorism Risk Insurance Act of 2002 (“TRIA”) provided for federal government assistance to property and casualty insurers in the event of material losses due to terrorist acts on behalf of a foreign person or foreign interest. In June 2004, TRIA was extended through the end of 2005. Group life insurance is not currently covered under TRIA. Group life insurance represents a significant portion of our revenues and income. Concentration of risk is inherent in the group life insurance products we offer and we have group life insurance exposure to certain customers in amounts significantly in excess of our catastrophe reinsurance coverage. Because of our concentration of risk, an occurrence of a significant catastrophe or a change in the on-going nature and availability of reinsurance and catastrophe reinsurance could have a material adverse effect on the Company’s business, financial position, results of operations or cash flows.

Asset/Liability and Interest Rate Risk Management

See Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Asset/Liability and Interest Rate Risk Management.”

INVESTMENTS

Investment management is an integral part of our business. Investments are maintained to ensure that asset types and maturities are appropriate for the Company’s policy reserves and other liabilities so that we can meet our obligations to policyholders under a wide variety of economic conditions. A substantial portion of our insurance subsidiaries’ policy liabilities result from long term disability reserves that have proven to be very stable over time, and annuity products on which interest rates can be adjusted periodically, subject to minimum interest rate guarantees. Policyholders or claimants may not withdraw funds from the large block of disability reserves. Instead, claim payments are issued monthly over periods that may extend for many years. Holding these stable long term reserves makes it possible to allocate a significant portion of invested assets to long term fixed-rate investments, including commercial mortgage loans. The ability to allocate a significant portion of investments to commercial mortgage loans, combined with StanCorp Mortgage Investors’ unique expertise with respect to its market niche for small, fixed-rate commercial mortgage loans, provides the ability to achieve a higher yield on the overall investment portfolio. See Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Investing Cash Flows” and Item 8, “Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements.”

REGULATION

State and Federal Laws and Regulations

The insurance industry in the United States is subject to extensive regulation. Standard is regulated in all states other than New York, and in the District of Columbia. The Standard Life Insurance Company of New York is regulated in New York. Such regulation relates to, among other things, terms and provisions of insurance policies, market conduct practices, maintenance of capital and payment of distributions, and financial reporting on a statutory basis of accounting.

Beginning in 2005, certain investment funds we manage related to registered group variable annuity products are registered investment companies under the Investment Company Act of 1940. Those funds and the StanCorp entity that serves as the funds’ investment adviser are subject to that act and the rules thereunder, which, among other things, regulate the relationship between a registered investment company and its investment adviser.

Registered investment advisers are subject to regulation under the Investment Advisers Act of 1940. This Act requires, among other things, recordkeeping and reporting requirements, disclosure requirements, limitations on agency cross and principal transactions between an adviser and advisory clients, as well as general anti-fraud prohibitions.

The Sarbanes-Oxley Act of 2002 and rules promulgated by the SEC and the New York Stock Exchange thereunder have imposed substantial new or enhanced regulations and disclosure requirements in the areas of corporate governance (including director independence, director selection and audit, corporate governance and compensation committee responsibilities), equity compensation plans, auditor

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independence, pre-approval of auditor fees and services and disclosure and internal control procedures. We are committed to industry best practices in these areas and believe we are in compliance with the relevant rules and regulations.

Violation of applicable laws and regulations can result in legal or administrative proceedings which can result in fines, penalties, cease and desist orders or suspension or expulsion.

Capital Requirement—Risk-Based Capital

The National Association of Insurance Commissioners (“NAIC”) has a tool to aid in the assessment of the statutory capital and surplus of life and health insurers. This tool, known as Risk-Based Capital (“RBC”), augments statutory minimum capital and surplus requirements. RBC employs a risk-based formula that applies prescribed factors to the various risk elements inherent in an insurer’s business to arrive at minimum capital requirements in proportion to the amount of risk assumed by the insurer.

State insurance departments require insurance enterprises to maintain minimum levels of capital and surplus. Our target is generally to maintain capital at 265% to 275% of the minimum company action level of RBC required by state regulators to avoid remedial action by our insurance subsidiaries (this equates to 530% to 550% of the authorized control level RBC by our states of domicile).

Broker Compensation Issues

During the third quarter of 2004, two significant insurance industry issues surfaced surrounding compensation of insurance brokers. The first related to issues of bid-rigging, or deceptive sales practices used to steer customers to certain insurance companies or coverages. The second pertained to payment and disclosure of insurance broker compensation. Related to these issues:

The Company will continue to monitor developments around broker compensation. We look forward to the clarification in both regulations and disclosure that will come as these matters develop.

EMPLOYEES

At December 31, 2004, StanCorp and its subsidiaries had 2,770 full-time equivalent employees. Approximately 75% of the Company’s operations are located in Portland, Oregon.

Principal properties owned by Standard and used by the Company consist of two office buildings in downtown Portland, Oregon: the Standard Insurance Center, with approximately 457,000 square feet; and the Standard Plaza, with approximately 216,000 square feet. In addition, Standard leases 160,000 square feet of office space in a third office building, also located in downtown Portland, Oregon, and 60,000 square feet of offsite storage. All three of our business segments use the facilities described above. The Company also leases 56 offices under commitments of varying terms to support its sales and regional processing offices throughout the United States. Late in 2004, the Company acquired 72,000 square feet of office space in Hillsboro, Oregon. Two of our investment businesses are expected to move to the Hillsboro location in the first quarter of 2005. Management believes that the capacity and types of facilities are suitable and adequate. Management may evaluate additional square footage in 2005 to accommodate its increasing workforce. See Item 8, “Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Summary of Significant Accounting Policies—Property and equipment, net.” See also Item 8, “Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements—Contingencies and Commitments.”

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In the normal course of business, the Company is involved in various legal actions and other state and federal proceedings. A number of actions or proceedings were pending as of December 31, 2004. In some instances, lawsuits include claims for punitive damages and similar types of relief in unspecified or substantial amounts, in addition to amounts for alleged contractual liability or other compensatory damages. In the opinion of management, the ultimate liability, if any, arising from the actions or proceedings is not expected to have a material adverse effect on the Company’s business, financial position, results of operations or cash flows.

There were no matters submitted to a vote of StanCorp’s shareholders during the fourth quarter of 2004.

EXECUTIVE OFFICERS OF THE REGISTRANT

Information relating to Directors of StanCorp is set forth under the captions “Election of Directors” and “Corporate Governance—Committees of the Board” in the 2005 Proxy Statement and is incorporated herein by reference.

The information with respect to executive officers is set forth, pursuant to General Instruction G of Form 10-K, under Part I of this Report.

Information relating to beneficial ownership reporting compliance by directors and executive officers of the Company pursuant to Section 16(a) of the Exchange Act is set forth under the caption “Section 16(a) Beneficial Ownership Reporting Compliance” in the 2005 Proxy Statement, and is incorporated herein by reference.

We have Codes of Business Ethics for all Directors, senior executive officers including the Chairman, President and Chief Executive Officer and the Senior Vice President and Chief Financial Officer of StanCorp (its principal executive officer and principal financial and accounting officer, respectively), and employees of the Company. The Codes of Business Ethics are available on the Company’s web site at www.stancorpfinancial.com/investors. A copy of the Codes of Ethics will be provided without charge to any person who requests them by writing to the address or telephoning the number indicated under “Available Information” on page 3. We will disclose on our web site any amendments to or waivers from our Codes of Business Ethics applicable to Directors or executive officers of StanCorp, including the Chairman, President and Chief Executive Officer and the Senior Vice President and Chief Financial Officer, in accordance with all applicable laws and regulations.

The executive officers of StanCorp are as follows:

Set forth below is biographical information for the executive officers of StanCorp:

John M. Bernard has been senior vice president, operational excellence since February of 2004. Mr. Bernard also oversees the Company’s Information Technology function. Prior to joining Standard, Mr. Bernard served as president, chief executive officer and co-founder of StoriedLearning, Inc. since 2000. From 1998 to 2000, Mr. Bernard served as president, chief executive officer and co-founder of Capabiliti Incorporated.

Kim W. Ledbetter, FSA, CLU, has been senior vice president, asset management and individual disability since June of 2004, in charge of all of Standard’s investment operations, including StanCorp Mortgage Investors, StanCorp Investment Advisers and our real estate department. Mr. Ledbetter also continues to oversee the individual insurance and retirement plans divisions, positions he has held since 1997 and 1994, respectively.

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Cindy J. McPike, CPA, has been senior vice president and chief financial officer of StanCorp and Standard since July of 2004. Prior to this, Ms. McPike was vice president and chief financial officer since July of 2002. Ms. McPike was vice president, controller and treasurer of StanCorp and Standard since July of 2001. Ms. McPike served in officer positions at StanCorp and Standard since 1999 and was manager, corporate accounting of Standard from 1998 to 1999. Prior to joining Standard, Ms. McPike served in various management positions at NW Natural, most recently as director of Internal Audit.

J. Gregory Ness, LLIF, has been senior vice president, employee benefits division since April of 2004. Previously, Mr. Ness was senior vice president, investments of Standard since 1999. Mr. Ness was vice president and corporate secretary of StanCorp from its incorporation until 2000. From 1997 to 1999, Mr. Ness was vice president and corporate secretary of Standard.

Eric E. Parsons has been chairman, president and chief executive officer of StanCorp and Standard since May of 2004. Prior to this, Mr. Parsons was president since May 2002 and chief executive officer since January 2003. Mr. Parsons was senior vice president and chief financial officer of StanCorp from its incorporation until 2002 and was senior vice president and chief financial officer of Standard from 1998 through 2002. From 1997 to 1998, Mr. Parsons was senior vice president and chief financial and investment officer of Standard.

Michael T. Winslow, JD, has been senior vice president, general counsel and corporate secretary of StanCorp and Standard since July of 2004. Prior to this, Mr. Winslow was vice president, general counsel and corporate secretary since 2001. Prior to joining StanCorp, Mr. Winslow served as assistant general counsel and chief compliance officer for PacifiCorp.

AUDIT COMMITTEE

StanCorp has a separately-designated standing Audit Committee established in accordance with Section 3(a)58(A) of the Exchange Act. The members of the Audit Committee are Virginia L. Anderson, Wanda G. Henton, Jerome J. Meyer, Ralph R. Peterson, and Michael G. Thorne.

AUDIT COMMITTEE FINANCIAL EXPERT

Information regarding the audit committee financial expert is reported under the caption “Committees of the Board” in the Company’s 2005 Proxy Statement and is incorporated herein by reference.

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(c) The following table sets forth share purchases made, for the periods indicated:

StanCorp’s common stock is listed on the New York Stock Exchange under the symbol “SFG.” As of February 25, 2005, there were 46,694 shareholders of record of common stock.

The high and low sales prices as reported by the New York Stock Exchange and cash dividends paid per share of common stock were as follows by calendar quarter:

The declaration and payment of dividends in the future is subject to the discretion of StanCorp’s board of directors. It is anticipated that annual dividends will be paid in December of each year depending on StanCorp’s financial condition, results of operations, cash requirements, future prospects, regulatory restrictions on the distributions from the insurance subsidiaries, the ability of the insurance subsidiaries to maintain adequate capital and other factors deemed relevant by StanCorp’s board of directors. See Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Capital Management.”

From time to time, the board of directors has authorized share repurchase programs. Share repurchases are to be

effected in the open market or in negotiated transactions in compliance with the safe harbor provisions of Rule 10b-18 under regulations of the Securities Exchange Act of 1934. Execution of the share repurchase program is based upon management’s assessment of market conditions for its common stock and other potential growth opportunities. On November 8, 2004, the board of directors authorized a new share repurchase program of up to 1.5 million shares of StanCorp common stock. The new share repurchase program expires on December 31, 2005, and replaced the Company’s previous share repurchase program.

During 2004, the Company repurchased approximately 1.2 million shares of common stock at a total cost of $74.7 million for a volume weighted-average price of $63.38 per common share. At December 31, 2004, the Company had 1,453,600 shares remaining under its current share repurchase program. Also during 2004, the Company acquired 26,749 shares of common stock from executive officers to cover tax liabilities resulting from the release of performance-based shares at a total cost of $1.8 million for a volume weighted-average price of $67.40 per common share.

During 2003, the Company repurchased 185,700 shares of common stock at a total cost of $9.3 million for a volume weighted-average price of $50.35 per common share. Also during 2003, the Company acquired 22,986 shares of common stock from executive officers to cover tax liabilities resulting from the release of performance-based shares at a total cost of $1.1 million for a volume weighted-average price of $47.76 per common share.

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The following financial data at or for the years ended December 31, should be read in conjunction with Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Item 8, “Financial Statements and Supplementary Data.”

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The following management assessment of the financial condition and results of operations should be read in conjunction with the consolidated financial statements and related notes thereto. See Item 8, “Financial Statements and Supplementary Data.” Our consolidated financial statements and certain disclosures made in this Form 10-K have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and require us to make estimates and assumptions that affect reported amounts of assets and liabilities and contingent assets and contingent liabilities at the dates of the financial statements and the reported amounts of revenues and expenses during each reporting period. The estimates most susceptible to material changes due to significant judgment are identified as critical accounting policies. The results of these estimates are critical because they affect our profitability and may affect key indicators used to measure the Company’s performance. See “Critical Accounting Policies and Estimates.”

We have made in this Form 10-K, and from time to time may make in our public filings, news releases and oral presentations and discussions, certain statements which are not based on historical facts. These statements are “forward-looking” and, accordingly, involve risks and uncertainties that could cause actual results to differ materially from those discussed. Although such forward-looking statements have been made in good faith and are based on reasonable assumptions, there is no assurance that the expected results will be achieved. See “Forward-looking Statements.”

EXECUTIVE SUMMARY

Financial Results Overview

Our financial results for 2004 were strong despite challenging economic conditions, including slow job growth and low interest rates. Net income for the full year 2004 was $6.90 per diluted share, a 29.5% increase compared to $5.33 per diluted share for the full year 2003. Net income for the full year 2004 was $199.4 million, a 27.6% increase compared to $156.3 million for 2003. These results represent growth in all of our business segments fueled by strong sales and favorable business retention. Other factors contributing to the solid results included favorable claims experience, the resolution of certain income tax matters, and a continued high level of commercial mortgage loan prepayment fees.

Outlook for 2005

It has been our long-term objective to grow premiums in the range of 10% to 12% annually. Economic conditions, including low interest rates and limited job growth, together with the rising cost of medical premiums faced by our customers, negatively impacted our sales and premium growth in 2004. We believe that improving economic conditions will positively affect our results in 2005. Significant factors that are likely to influence our 2005 financial results when compared to 2004 include:

CONSOLIDATED RESULTS OF OPERATIONS

Revenues

Revenues consist primarily of premiums and net investment income. Total revenues increased $82.9 million, or 4.0%, for 2004 compared to 2003, and $312.2 million, or 17.8%, for 2003 compared to 2002. Revenue growth for 2003 includes the effect of the reinsurance of a block of group disability and group life business from TIAA. Effective October 1, 2002, Standard entered into a reinsurance agreement with TIAA to assume TIAA’s group disability and group life insurance business. This business included approximately 1,800 group insurance contracts, representing 650,000 insured individuals. Standard paid a ceding commission of approximately $75 million and received approximately $705 million in assets and corresponding statutory liabilities.

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Premiums

The following table sets forth premium growth as a percentage by segment for the years ended December 31:

Group employee benefits insurance (our Employee Benefits segment) is our largest business and represented 92.7%, 93.2% and 92.8% of total premiums for 2004, 2003 and 2002, respectively. As a result, premium growth from the Employee Benefits segment is the most significant driver of consolidated premium growth. We exceeded our long-term objective of 10% to 12% premium growth for 2003 and 2002 primarily due to strong premium growth in the Employee Benefits segment. In 2003, consolidated premium growth was also benefited by the assumption of the TIAA block of business. For 2004, consolidated premium growth was below our long-term objective primarily due to slower premium growth from the Employee Benefits segment, which was due largely to slower growth in our in force block of business as a result of slower employment and wage growth, commensurate with overall economic conditions, and correspondingly slower sales growth for this same segment for 2003 and the first half of 2004. See “Business Segments.”

Net Investment Income

Net investment income increased $10.8 million, or 2.4%, for 2004 compared to 2003. The net increase resulted from a combination of higher invested assets, offset in part by a decrease in yield on invested assets. Average invested assets increased 9.2% for 2004, compared to 2003. Due to new investments, including normal portfolio turnover, at the comparably lower interest rates available during 2004, the portfolio yield for fixed maturity securities decreased to 5.81% at the end of 2004, from 5.94% at the end of 2003. Similarly, the portfolio yield for commercial mortgage loans decreased to 6.71% at the end of 2004, from 7.28% at the end of 2003.

Net investment income increased $56.7 million, or 14.7%, for 2003 compared to 2002. This increase included continuing investment of proceeds from the assumption of the TIAA block of business and approximately $200 million of the related proceeds from the issuance of long-term debt (see “Business Segments—Employee Benefits Segment”) and higher commercial mortgage loan prepayment fees. The portfolio yield for fixed maturity securities decreased to 5.94% at the end of 2003 from 6.22% at the end of 2002. Due to new investments, including normal portfolio turnover, at the comparable lower interest rates available during 2003, the portfolio yield for commercial mortgage loans decreased to 7.28% at the end of 2003, from 7.94% at the end of 2002.

Commercial mortgage loan prepayment fees were $14.9 million, $17.0 million, and $9.0 million for 2004, 2003 and 2002, respectively. The level of commercial mortgage loan prepayment fees will vary depending on the overall interest rate environment. If interest rates rise, we could see a decrease in prepayment fees. Currently, 72% of our commercial mortgage loan portfolio has a provision that requires the borrower to pay a prepayment fee that assures that the Company’s expected cash flow from commercial mortgage loan investments will be fully protected in the event of prepayment. Since 2001, all new commercial mortgage loans contain the new prepayment provision. The remainder of our commercial mortgage loans contain fixed prepayment fees such that total cash flows may be more than or less than those originally expected at the time the loans were made.

Net Capital Gains (Losses)

Net capital gains and losses occur as a result of sale or impairment of the Company’s invested assets, neither of which is likely to occur in regular patterns. While impairments are generally not controllable, management has significant discretion over the timing of sales of invested assets. Net capital gains and losses are reported in “Other.” Net capital gains were $11.5 million and $9.3 million for 2004 and 2003, respectively, while 2002 had net capital losses of $19.7 million. Net capital gains for both 2004 and 2003 included gains on bond sales. Net capital losses for 2002 were primarily related to impairments of our holdings of WorldCom, Lukens, Sprint, and AT&T bonds. For 2003 and 2004, there were no significant impairments.

Benefits and Expenses

Benefits to Policyholders (including interest credited)

Three primary factors drive benefits to policyholders: premium growth (reserves are established in part based on premium levels), claims experience, and the assumptions used to establish related reserves. The predominant factors affecting claims experience are incidence (number of claims) and duration (length of time a disability claim is paid). The assumptions used to establish the related reserves consider incidence and duration, as well as new investment interest rates, which affect the discount rate used to establish reserves. See “Critical Accounting Policies and Estimates—Reserves.”

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The following table sets forth benefits to policyholders, including interest credited, by segment for the years ended December 31:

While premiums increased 4.3% for 2004 compared to 2003, benefits to policyholders decreased $5.1 million, or 0.4%, for the same comparative periods primarily due to favorable claims experience in the Employee Benefits segment during 2004. In addition, we continued to experience favorable and sustained claims recovery patterns for Employee Benefits group long term disability insurance, and as a result of our on-going assessment of those recovery patterns, we released reserves totaling $12.0 million for 2004, which decreased benefits to policyholders. If the favorable and sustained claims recovery patterns in our group long term disability insurance continue, we may release up to an additional $9 million of reserves in the first three quarters of 2005. Partially offsetting the release of $12 million of reserves for 2004 was a $9 million reserve established as a result of a pricing miscalculation on long term disability contracts with one large Employee Benefits customer.

Benefits to policyholders, including interest credited, increased $182.8 million, or 15.4% for 2003, compared to 2002 primarily related to our assumption of the TIAA block of business.

Claims experience can be volatile from quarter to quarter. For an additional discussion of factors affecting benefits to policyholders see “Business Segments”.

Operating Expenses

Operating expenses increased $23.6 million, or 8.4% for 2004 compared to 2003, and $32.3 million, or 13.0% for 2003 compared to 2002. The increases for both comparative periods primarily were to support business growth, as evidenced by premium growth. In addition, operating expenses for 2004 included $9.0 million for enhancements of our customer service and product delivery systems, $3.4 million to support compliance with Sarbanes-Oxley legislation, a $2.7 million increase in employee medical benefit expenses, and a $1.3 million increase in stock-based compensation expense.

In 2003, we began expensing the cost related to stock-based compensation in the determination of net income by adopting fair value recognition provisions for all director and employee grants and awards after January 1, 2003. Total stock-based compensation expense as a result of this adoption was $3.6 million and $2.3 million for 2004 and 2003, respectively. Operating expenses for 2003 also included transitional administrative fees related to the TIAA block of business totaling $8.1 million.

Consolidated operating expenses in 2005 are likely to exceed historical levels to support enhanced investment in customer service systems technology and processes.

Commissions and Bonuses

Commissions and bonuses primarily represent sales-based compensation, which varies depending on the product, the structure of the commission program and factors such as persistency and profitability of business. Commissions and bonuses increased $10.3 million, or 7.1%, for 2004 compared to 2003, and $11.5 million, or 8.7% for 2003 compared to 2002. Increases for both comparative periods were primarily due to renewals and sales in each of our segments.

Interest Expense

Interest expense (recorded in “Other”) was $17.7 million, $17.5 million, and $5.0 million for 2004, 2003, and 2002, respectively. Increases for the comparative periods were primarily due to interest expense on senior notes. Late in the third quarter of 2002, we completed an initial public debt offering of $250.0 million of 6.875%, 10-year senior notes. Prior to that, our debt consisted mainly of periodic short term borrowings. See “Liquidity and Capital Resources—Financing Cash Flows.”

Net Increase in Deferred Acquisition Costs (“DAC”) and Value of Business Acquired (“VOBA”)

We defer certain policy acquisition-related commissions and incentive payments, certain costs of policy issuance and underwriting, and certain printing costs related to obtaining new business and acquiring business through reinsurance agreements. These costs are then amortized into expenses

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over a period not to exceed the life of the related policy. VOBA primarily represents the discounted future profits of business assumed through reinsurance agreements. See “Critical Accounting Policies and Estimates—Deferred Acquisition Costs and Value of Business Acquired.” The net increase in DAC and VOBA for 2004, 2003, and 2002 was $15.2 million, $12.1 million and $15.8 million, respectively.

Income Taxes

Total income taxes may differ from the amount computed by applying the federal corporate tax rate of 35% because of the net result of permanent differences and the inclusion of state and local income taxes, net of the federal benefit. The combined federal and state effective tax rates were 31.7%, 34.8%, and 35.5% for 2004, 2003, and 2002, respectively. Income taxes for 2004 were reduced approximately $7 million for the favorable resolution of uncertainties related to the Internal Revenue Service examination of the Company’s tax years through 2001, and favorable outcomes on state tax return matters. In addition, income taxes for 2004 were $1.8 million lower than 2003 due to a higher permanent deduction allowed for dividends received by equity investments in separate account assets under management in the Retirement Plans segment (see “Business Segments—Retirement Plans Segment”). At December 31, 2004, years open for audit by the Internal Revenue Service were 2002, 2003 and 2004.

BUSINESS SEGMENTS

We operate through three segments: Employee Benefits, Individual Insurance, and Retirement Plans.

Employee Benefits Segment

As measured by premiums, the Employee Benefits segment is our largest segment and substantially influences our consolidated financial results. This segment sells disability, life, AD&D, and dental insurance to employer groups. Income before income taxes for the Employee Benefits segment increased 24.5% to $242.0 million for 2004 compared to 2003, and 22.7% to $194.4 million for 2003 compared to 2002. The increases for the comparative periods were driven primarily by premium growth and decreased benefits to policyholders as a result of favorable claims experience. In addition, the increase for 2003 compared to 2002 was affected by the assumption of the TIAA block of business.

Following are key indicators that management uses to manage and assess the performance of the Employee Benefits segment at or for the years ended December 31:

Premiums

Three primary factors drive premium growth for the Employee Benefits segment:

Organic growth. The rate of growth in our in force block of business decreased in 2003 and 2004, compared to 2002, in part due to lower wage rate increases and slower employment growth, commensurate with current economic conditions.

Persistency. Persistency for the Employee Benefits segment has historically exceeded industry averages, which we believe demonstrates our commitment to customer service and pricing discipline for new sales. Our persistency remained relatively stable for 2004, 2003 and 2002.

Sales. In 2003 and the first half of 2004, sales for this segment decreased as a result of competitive pressure in the market, including the effects of decreasing interest rates and their effect on our pricing competitiveness (see Item 1, “Business—Competition”). During 2004, we reviewed our pricing and lowered rates for our group insurance products in select market segments and industries in order to compete more effectively for new business. We also realigned our compensation plan for field representatives and are continuing to enhance our product offerings. Through these actions we are better using our market data to focus on customers, industries, and sectors where we can be more competitive and still reach our return objectives. As a result, sales reached record highs in the second half of 2004, and annual sales for 2004 were 25.1% higher than 2003.

Premium growth for 2003 included premiums assumed from the TIAA block of business. When assumed, this block of business represented premiums of approximately $180 million.

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Benefits to Policyholders (including interest credited)

While premiums for the Employee Benefits segment increased 3.7% for 2004 compared to 2003, benefits to policyholders decreased $14.8 million or 1.2% for the same comparative periods primarily due to favorable claims experience during 2004. The favorable claims experience resulted from a combination of lower incidence and duration across product lines and industries. In addition, we continued to experience favorable and sustained claims recovery patterns for Employee Benefits group long term disability insurance, and as a result of our on-going assessment of those recovery patterns, we released reserves, which decreased benefits to policyholders, totaling $12.0 million for 2004. If the favorable and sustained claims recovery patterns in our group long term disability insurance continue, we may release up to an additional $9 million of reserves in the first three quarters of 2005. Partially offsetting the release of $12.0 million of reserves for 2004 was a $9 million reserve established as a result of a pricing miscalculation on long term disability contracts with one large Employee Benefits customer.

Premiums for the Employee Benefits segment increased 16.8% for 2003 compared to 2002, while benefits to policyholders (including interest credited) increased $185.8 million, or 18.0% for the same comparative periods. Claims experience, for both incidence and duration across product lines and industry sectors, was slightly less favorable for 2003 compared to 2002. In addition, benefits to policyholders increased for 2003 as a result of our assumption of the TIAA block of business late in 2002.

Benefits to policyholders are also affected by changes in reserves. The establishment of reserves includes discounting expected future benefits to their present value. The discount rate used, which is determined quarterly, is based on our average new money investment rate for a quarter less a margin to allow for reinvestment risk and credit quality exposure. Given the current low interest rate environment, and correspondingly lower reinvestment risk, our targeted margin range for newly incurred claims is approximately 20-30 basis points over a 12-month period. As interest rates increase, we expect to also increase our targeted margin to allow for higher levels of reinvestment risk.

During 2004, we reduced the discount rate used to establish new long term disability reserves in the Employee Benefits segment from 5.20% to 5.00%. We expect the average new money investment rate, including some expansion in the spread earned on those investments, to increase up to 1% in 2005. Given that we discount new reserves established in each quarter using our average new money investment rate less a margin, the expected increase in our average new money investment rate may result in an increase in the discount rate used to establish new reserves in 2005, and therefore, also may reduce the expense of benefits to policyholders. Based on our current size, a 0.25% change in the discount rate would result in a quarterly change of approximately $2 million in the expense of benefits to policyholders and pre-tax earnings, until related adjustments are made to premium rates (generally group long term disability policies offer rate guarantees for periods from one to three years). An increase in the discount rate will result in recording lower benefits to policyholders while a decrease in the rate will result in recording higher benefits to policyholders.

Should reinvestment rates ultimately prove to be lower than provided for in the margin between the new money investment rate and the reserve discount rate, we could be required to increase reserves which would cause benefits to policyholders to increase. The duration of our invested assets is well matched to the duration of our liabilities in total. Our investments are generally not callable or have prepayment penalties. Based on these factors, we believe the current margin in our overall block of business between invested assets yield and weighted average reserve discount rate of 0.44% is adequate to cover potential reinvestment risk. See “Liquidity and Capital Resources.”

We expect the benefit ratio for the Employee Benefits segment for 2005 to be lower than the average over the past few years due to the effects of expected increases in new investment interest rates and the potential $9 million release of reserves. In the Employee Benefits segment, the benefit ratio can fluctuate widely from quarter to quarter.

Operating Expenses

Operating expenses as a percentage of premiums were 14.8%, 14.2%, and 14.5% for 2004, 2003 and 2002, respectively. See “Consolidated Results of Operations—Benefits and Expenses—Operating Expenses.”

Individual Insurance Segment

The Individual Insurance segment sells disability insurance and fixed-rate annuities, including life contingent annuities, to individuals. Most of the deposits on our annuity business are not recorded as premiums. Annuity premiums consist of premiums on life contingent annuities, which are a small portion of sales. Annuity deposits are recorded as a liability and therefore not reflected as premiums. Annuity deposits earn investment income, a portion of which is credited to policyholders.

Income before income taxes for the Individual Insurance segment was $34.0 million, $37.4 million, and $31.7 million for 2004, 2003, and 2002, respectively. The following table

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sets forth key indicators that management uses to manage and assess the performance of the Individual Insurance segment at or for the years ended December 31:

Premiums

Premium growth in our Individual Insurance segment is driven largely by sales of individual disability insurance. Premiums increased $9.5 million, or 11.1%, for 2004 compared to 2003, and $5.4 million, or 6.8%, for 2003 compared to 2002. Sales of individual disability products reached record highs in 2004, growing 18.1% compared to 2003. Sales growth for 2003 was 39.1% compared to 2002. Increases in sales, and therefore premiums, for both comparative periods resulted from an expansion of distribution channels in recent years and the continuation of a national marketing agreement with Minnesota Life for individual disability products. Increased persistency in our individual disability insurance products also contributed to premium growth for this segment.

Premiums for this segment can fluctuate from year to year due in part to an experience rated reinsurance agreement, entered into in 2002, on a block of disability policies related to the Minnesota Life reinsurance agreement. Reinsurance premiums under this agreement, which are recorded as an adjustment to premiums, reduced premiums by $6.2 million and $3.8 million for 2004 and 2003, respectively. If claims experience is consistent with our expectations, this reinsurance agreement is expected to reduce annual premiums by approximately $9 million and annual income before income taxes by approximately $1 million. As the block of business matures over a period of years, the annual effects on premiums and income before income taxes are expected to decrease.

Individual fixed-rate annuity deposits increased $44.6 million, or 32.0% for 2004, compared to 2003, and $30.3 million, or 27.8% for 2003 compared to 2002. Fixed-rate annuity sales have been strong for 2004 due to growth in our independent brokerage and financial institution distribution channels. Individual annuity assets under management reached a record $1.09 billion as of December 31, 2004.

Benefits to Policyholders

While premiums for the Individual Insurance segment increased 11.1% for 2004 compared to 2003, benefits to policyholders increased 10.7% for the same comparative periods. For 2003 compared to 2002, premiums increased 6.8%, yet benefits to policyholders decreased 6.0% for the same comparative periods, due to favorable claims incidence and duration during 2003.

Generally, we expect benefits to policyholders measured as a percentage of premiums (benefit ratio) to trend down over time to reflect the growth in this segment outside of the large block of disability business assumed in 2000 from Minnesota Life, and the corresponding shift in revenues from net investment income to premiums. The expected decrease from year to year in the expected benefit ratio as a percentage of total premiums does not necessarily indicate an increase in profitability; rather it reflects a change in the mix of revenues from the segment. Measured as a percentage of premiums, benefits to policyholders were 87.5%, 87.8% and 99.8% for 2004, 2003 and 2002, respectively.

We believe that the annual trend indicated by our past experience in the Individual Insurance segment is a reasonable indicator for the benefit ratio trend for that segment. We expect the volatility in the benefit ratio for this segment to continue, especially when measured on a quarterly basis.

Interest Credited

In many states, we are required to credit a minimum rate of interest to annuity contract holders. In the low interest rate environment of 2003, we were unable to achieve sufficient margin over minimum interest crediting rates on certain annuity products and therefore ceased offering those products. We resumed sales of these products in 2004. Recent changes in regulation have allowed us to begin to offer new products with lower interest rate guarantees. Factors affecting the level of sales of annuity deposits include movement in interest rates and the equity markets, which make alternative investments more or less attractive.

Retirement Plans Segment

The primary sources of revenue for the Retirement Plans segment include plan administration fees, fees on separate account assets (equity investments) under management, and investment margin on general account assets under management, which is a fixed-income investment option. In

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addition, premiums and benefits to policyholders reflect the conversion of retirement plan assets into life contingent annuities, which can be selected by plan participants at the time of retirement.

Income before income taxes for the Retirement Plans segment was $7.9 million, $5.3 million and zero for 2004, 2003 and 2002, respectively. During 2003, we surpassed $2.5 billion of assets under management, our expected level at which we estimated we could maintain consistent profitability. Following are key indicators that management uses to manage and assess the performance of the Retirement Plans segment:

Premiums

Premiums for the Retirement Plans segment are generated from three sources: plan administration fees, fees on separate account assets that are primarily based on average daily market values of assets under management, and life contingent annuities sold, which can vary significantly from year to year. Premium growth in our Retirement Plans segment was $4.0 million, or 17.2% for 2004 compared to 2003, and $4.3 million, or 22.6% for 2003 compared to 2002. The increases for both comparative periods were primarily from fees on separate account assets. At December 31, 2004, assets under management for this segment reached a record $3.37 billion, a 30.6% increase compared to $2.58 billion at December 31, 2003. The growth in assets under management was primarily from strong underlying business fundamentals including continuing deposits, strong customer retention, new sales growth, and an increase in the market value of equity investments in the separate account.

Premiums for life contingent annuities were $2.6 million, $3.0 million, and $2.5 million for 2004, 2003, and 2002, respectively.

Benefits to Policyholders

Benefits to policyholders for the Retirement Plans segment consist primarily of the effects of changes in reserves for life contingent annuities, which closely approximate the premiums recorded less benefits paid. Life contingent annuity sales can vary widely from quarter to quarter.

Interest Credited

Interest credited as a percentage of net investment income declined for 2004, compared to 2003 and 2002. The decreases correlate with the change in interest rates on invested assets as the investment margin becomes more significant relative to the total return on invested assets.

OTHER

Other businesses include StanCorp Mortgage Investors, which originates and services small fixed-rate commercial mortgage loans for investment portfolios of our insurance subsidiaries and generates additional fee income from the origination and servicing of commercial mortgage loans sold to institutional investors. StanCorp Mortgage Investors contributed income before income taxes of $12.1 million, $11.2 million, and $7.7 million for 2004, 2003, and 2002, respectively, before intercompany eliminations. Supporting both internal and external investor demand, StanCorp Mortgage Investors originated a record $1.17 billion of commercial mortgage loans for 2004, a 25.8% increase over 2003. The increase in commercial mortgage loan originations also was driven by originations for Standard to allocate more invested assets to commercial mortgage loans. See “Liquidity and Capital Resources—Investing Cash Flows.”

At December 31, 2004, StanCorp Mortgage Investors was servicing $2.95 billion in commercial mortgage loans for subsidiaries of StanCorp and $747.9 million for other institutional investors. Capitalized mortgage servicing rights associated with commercial loans serviced for other institutional investors were $2.1 million at December 31, 2004. We have specialized expertise in the origination and servicing of small fixed-rate commercial mortgage loans and have generated average annual growth in commercial mortgage loan originations of 40.5% in recent years.

LIQUIDITY AND CAPITAL RESOURCES

Asset/Liability and Interest Rate Risk Management

It is management’s objective to align generally the cash flow characteristics of assets and liabilities to ensure that the Company’s financial obligations can be met under a wide variety of economic conditions. From time to time, management may choose to liquidate certain investments and reinvest in alternate investments to better match the cash flow characteristics of assets to liabilities. See “—Investing Cash Flows.”

The Company manages interest rate risk, in part, through asset/liability duration analyses. As part of this strategy, detailed actuarial models of the cash flows associated with each type of insurance liability and the financial assets related to the liability are generated under various interest rate scenarios. Both interest rate risk and investment strategies are

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examined. The actuarial models include those used to support the statutory Statement of Actuarial Opinion required annually by insurance regulators. According to presently accepted actuarial standards of practice, statutory reserves of Standard and related items at December 31, 2004 made adequate provision for the anticipated cash flows required to meet contractual obligations and related expenses, in light of the assets held.

The duration of our invested assets was well matched to the duration of our liabilities in total, approximating 4.9 and 5.8, respectively, at December 31, 2004. Generally, duration is a measure of the price sensitivity of assets or liabilities to changes in interest rates. For example, a duration of 5 indicates that a 1% change in interest rates would result in a change of approximately 5% in the economic value of the asset or liability. Our investments generally have prepayment penalties or are not callable. As a percentage of our fixed maturity investments, callable bonds were 1.87% at December 31, 2004.

The Company’s financial instruments are exposed to financial market volatility and potential disruptions in the market that may result in certain financial instruments becoming less valuable. Financial market volatility includes interest rate risk. The Company has analyzed the estimated loss in fair value of certain market sensitive financial assets held at December 31, 2004 and 2003, given a hypothetical 10% increase in interest rates, and related qualitative information on how the Company manages interest rate risk. The interest rate sensitivity analysis was based upon the Company’s fixed maturity securities and commercial mortgage loans held at December 31, 2004 and 2003. Interest rate sensitivity of the Company’s financial assets was measured assuming a parallel shift in interest rates. All security yields were increased by 10% of the year end 10-year U.S. Government Treasury bond yield, or 0.42% for both the 2004 and 2003 analyses. The change in fair value of each security was estimated as the change in the option adjusted value of each security. Option adjusted values were computed using Company payment models and provisions for the effects of possible future changes in interest rates. The analyses did not explicitly provide for the possibility of non-parallel shifts in the yield curve, which would involve discount rates for different maturities being increased by different amounts. The actual change in fair value of the Company’s financial assets can be significantly different from that estimated by the model. The hypothetical reduction in the fair value of the Company’s financial assets that resulted from the model was estimated to be $162 million and $154 million at December 31, 2004 and 2003, respectively.

Operating Cash Flows

Net cash provided by operations is net income adjusted for non-cash items and accruals. Net cash provided by operating activities was $404.8 million, $337.4 million, and $380.4 million for 2004, 2003, and 2002, respectively. Adjustments to reconcile net income to net cash provided by operating activities for 2002 included a $20.0 million federal tax refund due to changes in temporary differences associated with a change in tax return filing status in prior years.

Investing Cash Flows

The Company maintains a diversified investment portfolio consisting primarily of fixed maturity securities and fixed-rate commercial mortgage loans. Investing cash inflows consist primarily of the proceeds of investments sold, matured, or repaid. Investing cash outflows consist primarily of payments for investments acquired or originated.

The insurance laws of the states of domicile and other states in which the insurance subsidiaries conduct business regulate the investment portfolios of the insurance subsidiaries. Relevant laws and regulations generally limit investments to bonds and other fixed maturity securities, mortgage loans, common and preferred stock, and real estate. Decisions to acquire and dispose of investments are made in accordance with guidelines adopted and modified from time to time by the insurance subsidiaries’ boards of directors. The Company does not currently use derivatives, such as interest rate swaps, currency swaps, futures, or options, to manage interest rate risk or for speculative purposes, but may use such instruments to manage interest rate risk in the future. Each investment transaction requires the approval of one or more members of senior investment staff, with increasingly higher approval authorities required for transactions that are more significant. Transactions are reported quarterly to the finance and operations committee of the board of directors for Standard and to the audit committee of the board of directors for The Standard Life Insurance Company of New York.

Net cash used in investing activities was $594.7 million, $743.6 million, and $637.9 million for 2004, 2003, and 2002, respectively. Net cash used in investing activities for 2004 and 2003 helped us to achieve our target investment portfolio allocation and included commercial mortgage loan originations of $1.17 billion and $930.6 million, respectively. Our target investment portfolio allocation is approximately 60% fixed maturity securities and 40% commercial mortgage loans. At December 31, 2004, our portfolio consisted of 59.3% fixed maturity securities and 39.6% commercial mortgage loans, with the remainder in real estate. We anticipate that commercial mortgage loans will continue to

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represent approximately 40% of our investment portfolio in the future. Net cash used in investing activities for 2003 and 2002 included investments in fixed maturity securities related to proceeds from the TIAA business and approximately $200 million in proceeds received from the issuance of long term debt (see “—Financing Cash Flows”).

Fixed Maturity Securities

Our fixed maturity securities totaled $4.41 billion at December 31, 2004. We believe that we maintain prudent diversification across industries, issuers, and maturities. The overall credit quality of our fixed maturity securities investment portfolio was A (Standard & Poor’s) as of December 31, 2004. The percentage of fixed maturity securities below investment-grade was well below industry averages at 3.9% and 3.5% at December 31, 2004 and 2003, respectively. Our corporate bond industry diversification targets are based on the Lehman Investment Grade Credit Index which is reasonably reflective of the mix of issuers broadly available in the market. We also target a specified level of government, agency and municipal securities in our portfolio for credit quality and additional liquidity.

Our fixed maturity securities portfolio had gross unrealized capital gains of $225.8 million and gross unrealized capital losses of $8.9 million at December 31, 2004. Unrealized losses primarily result from holding fixed maturity securities with interest rates lower than those currently available. Bonds on our credit quality watch list totaled approximately $1.2 million in carrying value at December 31, 2004. Should the credit quality of our fixed maturity securities decline, there could be a material adverse effect on the Company’s business, financial position, results of operations or cash flows.

Commercial Mortgage Loans

Commercial mortgage loans in our investment portfolio totaled $2.95 billion at December 31, 2004. We currently have a portfolio of over 3,500 commercial mortgage loans. The average loan to value ratio in the overall portfolio was 59% at December 31, 2004, and the average loan size was approximately $0.8 million. The Company receives personal recourse on almost all loans.

At December 31, 2004, we had commercial mortgage loans totaling $7.5 million that were more than sixty days delinquent and in the process of foreclosure, most of which have been reinstated since year end. We do not anticipate losses on these mortgages should they proceed through foreclosure. We had a net balance of restructured loans of $2.1 million at December 31, 2004, and a commercial mortgage loan loss reserve of $2.3 million. The delinquency rate and loss performance of our commercial mortgage loan portfolio has historically been better than industry averages as reported by the American Council of Life Insurers. The performance of our commercial mortgage loan portfolio may fluctuate in the future. Should the delinquency rate or loss performance of our commercial mortgage loan portfolio increase, the increase could have a material adverse effect on the Company’s business, financial position, results of operations or cash flows.

At December 31, 2004, our commercial mortgage loan portfolio was collateralized by properties with the following characteristics:

At December 31, 2004, our commercial mortgage loan portfolio was diversified regionally as follows:

Commercial mortgage loans in California account for 33.3% of our commercial mortgage loan portfolio at December 31, 2004. Due to this concentration, we are exposed to potential losses resulting from the risk of an economic downturn in California as well as to certain catastrophes, such as earthquakes, that may affect the region. Although we diversify our commercial mortgage loan portfolio within California by both location and type of property in an effort to reduce earthquake exposure, such diversification may not eliminate the risk of such losses. We do not require earthquake insurance for properties on which we make commercial mortgage loans, but do consider the potential for earthquake loss based upon seismic surveys and structural information specific to each property when new loans are underwritten.

Historically, the delinquency rate of our California-based commercial mortgage loans has been substantially below the industry average and consistent with our experience in other states. However, if economic conditions in California worsen, we could experience a higher delinquency rate on the portion of our commercial mortgage loan portfolio located in California, which could have a material adverse effect on the Company’s business, financial position, results of operations or cash flows.

Under the laws of certain states, contamination of a property may give rise to a lien on the property to secure recovery of the costs of cleanup. In some states, such a lien has priority over the lien of an existing mortgage against such property. As a commercial mortgage lender, we customarily conduct environmental assessments prior to making

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commercial mortgage loans secured by real estate and before taking title through foreclosure on real estate collateralizing delinquent commercial mortgage loans held by us. Based on our environmental assessments, we believe that any compliance costs associated with environmental laws and regulations or any remediation of affected properties would not have a material adverse effect on the Company’s business, financial position, results of operations or cash flows. However, we cannot provide assurance that material compliance costs will not be incurred by us, which could have a material adverse effect on the Company’s business, financial position, results of operations or cash flows.

In the normal course of business, we commit to fund commercial mortgage loans generally up to 90 days in advance. At December 31, 2004, the Company had outstanding commitments to fund commercial mortgage loans with fixed interest rates ranging from 4.875% to 7.0%, totaling $186.0 million. These commitments generally have fixed expiration dates. A small percentage of commitments expire due to the borrower’s failure to deliver the requirements of the commitment by the expiration date. In these cases, we will retain the commitment fee and good faith deposit. Alternatively, if we terminate a commitment due to our disapproval, the commitment fee and deposit will be refunded to the borrower, less an administrative fee.

Financing Cash Flows

Financing cash flows consist primarily of policyholder fund deposits and withdrawals, borrowings and repayments on the line of credit, borrowings and repayments on long-term debt, repurchase of common stock, and dividends paid on common stock. Net cash provided by financing activities was $200.7 million, $233.9 million, and $252.0 million for 2004, 2003, and 2002, respectively. The increase in policyholder fund deposits net of withdrawals for 2004 and 2003 primarily reflected higher individual annuity sales in the Individual Insurance segment and higher deposits into the Retirement Plans segment general account assets, both of which reflected distribution system growth during those time periods. Net cash provided by financing activities in 2002 included our initial public debt offering and repayment of our line of credit.

We currently have two unsecured credit agreements for $75 million each, with credit availability totaling $150 million. The agreements expire on June 27, 2005. Under the credit agreements, we are subject to customary covenants that take into consideration the impact of material transactions, changes to the business, compliance with legal requirements and financial performance. The financial covenants include limitations on indebtedness, financial liquidity and RBC. We are not required to maintain compensating balances, but pay commitment fees. Interest charged for use of the facilities is based on the federal funds rate, the bank’s prime rate, or the London Interbank Offered Rate at the time of borrowing plus an incremental basis point charge that varies by agreement, type of borrowing, and the amount outstanding on the lines. At December 31, 2004, we were in compliance with all covenants under the credit agreements and had no outstanding balance on the lines of credit. We currently have no commitments for standby letters of credit, standby repurchase obligations, or other related commercial commitments under the credit agreements.

StanCorp filed a $1.0 billion shelf registration statement with the SEC, which became effective on July 23, 2002, registering common stock, preferred stock, debt securities, and warrants. On September 25, 2002, we completed an initial public debt offering of $250.0 million of 6.875%, 10- year senior notes, pursuant to the shelf registration statement. The principal amount of the senior notes is payable at maturity and interest is payable semi-annually in April and October. Approximately $200 million was used to support payment of the $75 million ceding commission to TIAA to assume the block of business and to maintain Standard’s RBC ratio at our targeted level. The remaining proceeds were used to pay our annual dividend to shareholders, to fund a modest level of share repurchases and for general corporate purposes.

We had a debt to total capitalization ratio of 17.0% and 19.3% at December 31, 2004 and 2003, respectively. Our ratio of earnings to fixed charges for the years ended December 31, 2004 and 2003 was 3.9x and 3.4x, respectively.

CAPITAL MANAGEMENT

State insurance departments require insurance enterprises to maintain minimum levels of capital and surplus. Our target is generally to maintain capital at 265% to 275% of the company action level RBC, the minimum required by regulators to avoid remedial action by our insurance subsidiaries (this equates to 530% to 550% of the authorized control level RBC by our states of domicile). At December 31, 2004, our statutory capital (adjusted to exclude asset valuation reserves) was $1.02 billion, or 331% of the company action level RBC (which equates to 662% of the authorized control level RBC by our states of domicile).

In addition to maintaining targeted RBC, we seek to maintain excess capital of approximately 5% of consolidated equity excluding accumulated other comprehensive income, or approximately $60 million, as well as amounts sufficient to fund holding company operating expenses, interest on our

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debt and our annual dividend to shareholders, totaling approximately $50 million annually. Maintaining capital above targeted levels provides timing flexibility should we wish to access capital markets to finance growth or acquisitions.

At December 31, 2004, our total capital in excess of targeted RBC and holding company requirements was approximately $110 million. We will continue to maintain our three priorities, in the following order, for excess capital:

The level of excess capital we generate varies in relation to our levels of premium growth primarily due to initial reserve requirements, certain regulatory capital requirements based on premium, and certain acquisition costs associated with policy issuance. At higher levels of premium growth, we generate less excess capital. At very high levels of premium growth, we could generate the need for capital infusions into our insurance subsidiaries. At lower levels of premium growth, we generate more excess capital. Recently, with premium growth levels lower than our long-term objective, we have accumulated additional excess capital. If not utilized, excess capital could reduce return on average equity for 2005, as the rate of return available from the related investments could be less than we would expect to achieve if invested in businesses meeting our return objectives.

Dividends from Subsidiaries

StanCorp’s ability to pay dividends to its shareholders, repurchase its shares, and meet its obligations substantially depends upon the receipt of distributions from its subsidiaries, including Standard. Standard’s ability to pay dividends to StanCorp is affected by factors deemed relevant by Standard’s board of directors, including the ability to maintain adequate capital (RBC) according to Oregon law. Under Oregon law, Standard may pay dividends only from the earned surplus arising from its business. It also must receive the prior approval of the Director of the Oregon Department of Consumer and Business Services – Insurance Division (the “Oregon Insurance Division”) to pay a dividend if such dividend exceeds certain statutory limitations. The current statutory limitations are the greater of (a) 10% of Standard’s combined capital and surplus as of December 31st of the preceding year, or (b) the net gain from operations after dividends to policyholders and federal income taxes and before realized capital gains or losses for the 12-month period ended on the December 31st last preceding. In each case, the limitation must be determined under statutory accounting practices. Oregon law gives the Oregon Insurance Division broad discretion to disapprove requests for dividends in excess of these limits.

In August 2003, Standard made an extraordinary distribution to StanCorp of $200 million from its paid-in capital and contributed surplus. Concurrently, Standard borrowed the distributed amount from StanCorp and issued a $200 million subordinated surplus note. These transactions have no net financial statement impact as they eliminate in consolidation. The extraordinary distribution is a reduction of the paid-in capital that was recorded in connection with StanCorp’s contribution to Standard in 2002 to fund the reinsurance agreement with TIAA to assume TIAA’s group disability and group life insurance business. The surplus note matures in August 2018 and bears an interest rate of 6.44% per annum. The form of the surplus note complies with the requirements of the NAIC with respect to surplus notes, including provisions requiring the approval of the Oregon Insurance Division for any repayments of principal or for any payments of interest and subordinating any payments with respect to the surplus note to Standard’s other obligations to policyholders, lenders and trade creditors.

During 2004, Standard’s board of directors approved distributions to StanCorp to pay accrued interest and to make partial repayment of principal on the intercompany surplus note up to $155 million. At December 31, 2004, Standard had distributed a total of approximately $140 million related to that approval. The outstanding principal balance on the surplus note was $75 million at December 31, 2004. While the surplus note is outstanding, any distributions from Standard to StanCorp will be applied to the interest and outstanding principal on the surplus note. Standard paid dividends of $65.0 million to StanCorp in 2003.

The current amount of distributions approved by the board of directors, based on excess capital at December 31, 2004, is $198 million. We anticipate seeking approval of a distribution from the Oregon Insurance Division during 2005.

There is no amount available for payment of dividends by The Standard Life Insurance Company of New York in 2005. There are no regulatory restrictions on dividends from non-insurance subsidiaries to StanCorp. StanCorp Mortgage Investors paid dividends of $10.0 million and $13.2 million to StanCorp for 2004 and 2003, respectively.

Dividends to Shareholders

On November 8, 2004, the board of directors of StanCorp declared an annual cash dividend of $1.00 per share of common stock. The dividend was paid on December 3, 2004

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to shareholders of record at the close of business on November 19, 2004. The dividend represented a 43% increase over the annual dividend of $0.70 paid per share of common stock for 2003. On November 3, 2003, the board of directors of StanCorp declared an annual dividend of $0.70 per share of common stock. The dividend was paid on December 5, 2003, to shareholders of record at the close of business on November 14, 2003. The dividend represented a 75% increase over the annual dividend of $0.40 paid per share of common stock in 2002. The declaration and payment of dividends in the future is subject to the discretion of StanCorp’s board of directors and it is anticipated that annual dividends will be paid in December of each year depending on StanCorp’s financial condition, results of operations, cash requirements, future prospects, regulatory restrictions on distributions from the insurance subsidiaries, the ability of the insurance subsidiaries to maintain adequate capital, and other factors deemed relevant by StanCorp’s board of directors.

Share Repurchases

From time to time, the board of directors has authorized share repurchase programs. Share repurchases are to be effected in the open market or in negotiated transactions in compliance with the safe harbor provisions of Rule 10b-18 under regulations of the Securities Exchange Act of 1934. Execution of the share repurchase program is based upon management’s assessment of market conditions for its common stock and other potential growth opportunities. On November 8, 2004, the board of directors authorized a new share repurchase program of up to 1.5 million shares of StanCorp common stock. The new share repurchase program expires on December 31, 2005, and replaced the Company’s previous share repurchase program.

During 2004, we repurchased approximately 1.2 million shares of common stock at a total cost of $74.7 million for a volume weighted-average price of $63.38 per common share. At December 31, 2004, the Company had 1,453,600 shares remaining under its current share repurchase program. Also during 2004, the Company acquired 26,749 shares of common stock from executive officers to cover tax liabilities resulting from the release of performance-based shares at a total cost of $1.8 million for a volume weighted-average price of $67.40 per common share. See Item 5, “Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.”

During 2003, we repurchased 185,700 shares of common stock at a total cost of $9.3 million for a volume weighted-average price of $50.35 per common share. Also during 2003, the Company acquired 22,986 shares of common stock from executive officers to cover tax liabilities resulting from the release of performance-based shares at a total cost of $1.1 million for a volume weighted-average price of $47.76 per common share. See Item 5, “Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.”

DEBT RATINGS

Standard & Poor’s, Moody’s Investors Service, Inc., Fitch, Inc., and A.M. Best Company provide debt ratings on our senior debentures. As of December 2004, ratings from these agencies were BBB+, Baa1, A-, and bbb+, respectively.

FINANCIAL STRENGTH RATINGS

Financial strength ratings, which rate claims paying ability, are an important factor in establishing the competitive position of insurance companies. Ratings are important in maintaining public confidence in our company and in our ability to market our products. Rating organizations continually review the financial performance and condition of insurance companies, including our company. In addition, our debt ratings on our senior notes are tied to our financial strength ratings. A ratings downgrade could increase our surrender levels, adversely affect our ability to market our products, and also could increase future debt costs. Financial strength ratings are based primarily on statutory financial information. Standard & Poor’s, Moody’s Investors Service, Inc., Fitch, Inc., and A.M. Best Company provide assessments of our overall financial position.

Standard’s financial strength ratings as of February 2005 were:

In January 2004, Standard & Poor’s raised its outlook on our ratings from stable to positive.

CONTINGENCIES AND LITIGATION

In the normal course of business, the Company is involved in various legal actions and other state and federal proceedings. A number of actions or proceedings were pending as of December 31, 2004. In some instances, lawsuits include claims for punitive damages and similar types of relief in unspecified or substantial amounts, in addition to amounts for alleged contractual liability or other compensatory damages. In the opinion of management, the ultimate liability, if any, arising from the actions or proceedings is not expected to have a material adverse effect on the Company’s business, financial position, results of operations or cash flows.

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CONTRACTUAL OBLIGATIONS

The Company’s financing obligations generally include debts, lease payment obligations, and commitments to fund commercial mortgage loans. The remaining obligations reflect the long-term portion of other liabilities, excluding the Company’s obligations under our insurance and annuity product contracts. The following table summarizes the Company’s contractual obligations as of December 31, 2004:

The Company’s long-term debt obligations consisted primarily of the $250.0 million 6.875%, 10-year senior notes. Interest payable related to the total long-term obligations totals $144.8 million for the periods shown in the table. The operating lease obligations include leases on certain buildings and equipment under non-cancelable operating leases, software maintenance, licensing, and telecommunication commitments, all expiring in various years through 2011 with renewal options ranging from one to five years.

In the normal course of business, the Company commits to fund commercial mortgage loans that generally have fixed expiration dates. At December 31, 2004, the Company had outstanding commitments to fund commercial mortgage loans with fixed interest rates ranging from 4.875% to 7.0%, totaling $186.0 million. These commitments generally have fixed expiration dates. A small percentage of commitments expire due to the borrower’s failure to deliver the requirements of the commitment by the expiration date. In these cases, the Company will retain the commitment fee and good faith deposit. Alternatively, if we terminate a commitment due to our disapproval, the commitment fee and deposit will be refunded to the borrower, less an administrative fee.

Other long-term liabilities reflected in the Company’s balance sheet at December 31, 2004 consisted of a $13.5 million tax reimbursement liability related to the block of life insurance business sold to Protective Life Insurance Company in 2001, $10.3 million in capital commitments related to our low income housing investments, $19.9 million in unfunded liabilities for non-qualified deferred compensation and supplemental retirement plans, an accrued liability of $12.8 million for postretirement benefits, and $0.9 million of accrued guarantee association payments. In addition to long-term liabilities recorded on the balance sheet, a $5.5 million required minimum contribution to the defined benefit pension plan in 2005 is included in this category.

INSOLVENCY ASSESSMENTS

Insolvency regulations exist in many of the jurisdictions in which subsidiaries of the Company do business. Such regulations may require insurance companies operating within the jurisdiction to participate in guaranty associations. The associations levy assessments against their members for the purpose of paying benefits due to policyholders of impaired or insolvent insurance companies. Association assessments levied against the Company from January 1, 2002, through December 31, 2004, aggregated $0.3 million. At December 31, 2004, the Company maintained a reserve of $0.9 million for future assessments with respect to currently impaired, insolvent, or failed insurers.

STATUTORY FINANCIAL ACCOUNTING

Standard and The Standard Life Insurance Company of New York prepare their statutory financial statements in accordance with accounting practices prescribed or permitted by their states of domicile. Prescribed statutory accounting practices include state laws, regulations, and general administrative rules, as well as the Statements of Statutory Accounting Practices (“SSAP”), set forth in publications of the NAIC.

As of January 1, 2003, pursuant to SSAP No.37, Mortgage Loans, an increase of $6.2 million in surplus was reported to release the unamortized mortgage prepayment penalties included in the Interest Maintenance Reserve (“IMR”). Beginning in 2003, mortgage prepayment penalties are reported as investment income instead of realized capital gains, which are subject to the IMR amortization. The effect of this accounting change on 2003 statutory net income was an increase of $5.8 million.

Statutory accounting practices differ in some respects from GAAP. The principal statutory practices which differ from GAAP are: a) bonds and commercial mortgage loans are reported principally at amortized cost; b) asset valuation and

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IMR are provided as prescribed by the NAIC; c) certain assets designated as non-admitted, principally deferred tax assets, furniture, equipment, and unsecured receivables, are not recognized as assets, resulting in a charge to statutory surplus; d) annuity considerations with life contingencies, or purchase rate guarantees, are recognized as revenue when received; e) reserves for life and disability policies and contracts are reported net of ceded reinsurance and calculated based on statutory requirements, including required discount rates; f) commissions, including initial commissions and expense allowance paid for reinsurance assumed, and other policy acquisition expenses are expensed as incurred; g) initial commissions and expense allowance received for a block of reinsurance ceded net of taxes are reported as deferred gains in surplus and recognized as income in subsequent periods; h) federal income tax expense includes current income taxes defined as current year estimates of federal income taxes and tax contingencies for current and all prior years and amounts incurred or received during the year relating to prior periods, to the extent not previously provided; i) deferred tax assets, net of deferred tax liabilities, are included in the regulatory financial statements but are limited to those deferred tax assets that will be realized within one year; and j) surplus notes are included in capital and surplus.

Statutory net gains from insurance operations before federal income taxes were $275.8 million, $214.2 million, and $111.9 million for 2004, 2003, and 2002, respectively. Statutory capital, adjusted to exclude asset valuation reserves, totaled $1.02 billion and $930.4 million at December 31, 2004 and 2003, respectively.

NEW AND ADOPTED ACCOUNTING PRONOUNCEMENTS

In November 2003, the Financial Accounting Standards Board (“FASB”) reached a partial consensus under Emerging Issue Task Force (“EITF”) 03-1, The Meaning of Other-Than-Temporary Impairment and Its Application to Certain Investments. EITF 03-1 required certain quantitative and qualitative disclosures for securities accounted for under Statement of Financial Accounting Standards (“SFAS”) No.115, Accounting for Certain Investments in Debt and Equity Securities, that are impaired at the balance sheet date but for which an other-than-temporary impairment has not been recognized. The portions of EITF 03-1 on which consensus was reached were effective for financial statements for fiscal years ending after December 15, 2003. Effective December 31, 2003, the required disclosures were included in the notes to consolidated financial statements. The portions of EITF 03-1 on which consensus was not reached are not yet final. EITF 03-1 provides more specific guidelines related to SFAS No.115 regarding when impairments need to be recognized through the income statement, as well as on the balance sheet. EITF 03-1 addresses whether a change in the interpretation of temporary impairments due to interest rate and credit spread moves is appropriate. Under EITF 03-1, companies that do not have the ability and intent to hold an asset with unrealized losses until recovery of fair value would be required to impair the asset. Impaired losses would flow through net income and accretion on the impaired assets would be recognized in investment income in later periods. Currently, the FASB is considering whether a materiality threshold for recognizing impairment may be appropriate. The effective date for EITF 03-1 has been delayed until this determination is made. The Company is evaluating the potential financial statement effect of EITF 03-1.

On December 16, 2004, the FASB issued SFAS No.123R, Share Based Payment, which amends SFAS No.123 and SFAS No.95, Statement of Cash Flows, and requires compensation costs related to share-based payment transactions to be recognized in the financial statements. With limited exceptions, the amount of compensation cost will be measured based on the grant-date fair value of the equity or liability instruments issued. In addition, liability awards will be remeasured each reporting period. Compensation cost will be recognized over the period that an employee provides service in exchange for the reward. SFAS No.123R requires the expense of all unvested grants, including grants prior to 2003, to be reported in operating expense (the “modified prospective” method). Options with graded vesting will be expensed more rapidly. The use of the modified prospective method as of the July 1, 2005 effective date will result in additional pre-tax expense of approximately $0.7 million in 2005 and $0.6 million in 2006.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Our consolidated financial statements and certain disclosures made in this Form 10-K have been prepared in accordance with GAAP and require us to make estimates and assumptions that affect reported amounts of assets and liabilities and contingent assets and contingent liabilities at the dates of the financial statements and the reported amounts of revenues and expenses during the reporting periods. The estimates most susceptible to material changes due to significant judgment (identified as the “critical accounting policies”) are those used in determining investment impairments, the reserves for future policy benefits and claims, DAC and VOBA, and the provision for income taxes. The results of these estimates are critical because they affect our profitability and may affect key indicators used to measure the Company’s performance.

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These estimates have a material effect on our results of operations and financial condition.

Investment Impairments

The Company’s investment portfolio includes fixed maturity securities. When the fair value of a fixed maturity security is below its amortized cost, and depending on the length of time the condition exists and the extent the fair market value is below amortized cost, additional analysis is performed to determine whether an impairment exists. The analysis considers the financial condition and near-term prospects of the issuer, as well as the value of any security we may have in the investment. Often, the information available to conduct these assessments is limited and rapidly changing, making estimates of fair value subject to judgment. If actual information or conditions are different than estimated, the extent of the impairment of the fixed maturity security may be different than previously estimated, which could have a material effect on our results of operations and financial condition.

Reserves

Reserves represent amounts set aside today to pay future benefits and claims. Developing the estimates for reserves (and therefore the resulting impact on earnings) requires varying degrees of subjectivity and judgment, depending upon the nature of the reserve. For most of our reserves, the calculation methodology is prescribed by various accounting and actuarial standards, although judgment is required in the determination of assumptions to use in the calculation. We also hold reserves that lack a prescribed methodology but instead are determined by a formula that we have developed based on our own experience. Because this type of reserve requires a higher level of subjective judgment, we closely monitor its adequacy. Finally, a small amount of reserves is held based entirely upon subjective judgment. These reserves are generally set up as a result of unique circumstances that are not expected to continue far into the future and are released according to pre-established conditions and timelines. Because this type of reserve requires the highest level of subjective judgment, formal documentation of reasoning is required. Currently, these reserves represent less than 1% of total reserves held.

For most of our product lines, we establish and carry as a liability actuarially determined reserves that are calculated to meet our obligations for future policy benefits and claims. These reserves do not represent an exact calculation of our future benefit liabilities, but are instead estimates based on assumptions and considerations concerning a number of factors, including:

In particular, our group and individual long term disability reserves are sensitive to assumptions and considerations regarding the following factors:

Assumptions may vary by:

Certain of these factors could be materially affected by changes in social perceptions about work ethics, emerging medical perceptions and legal interpretations regarding physiological or psychological causes of disability, emerging or changing health issues and changes in industry regulation. If there are changes in one or more of these factors or if actual claims experience is materially inconsistent with our assumptions, we could be required to change our reserves.

Quarterly, we evaluate the appropriateness of the discount rate used to establish new long term disability claim reserves. We determine the discount rate based on the average rate of return on invested assets we acquire during the quarter less a margin to allow for reinvestment risk and credit quality deterioration. If assets are subsequently reinvested at rates less than the established discount rate on the reserves or credit quality deterioration is worse than provided for in the margin, we could be required to increase our reserves.

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Deferred Acquisition Costs and Value of Business Acquired

Certain costs related to obtaining new business and acquiring business through reinsurance agreements have been deferred to accomplish matching against related future premiums or gross profits, as appropriate. We normally defer certain acquisition related commissions and incentive payments, certain costs of policy issuance and underwriting, and certain printing costs. Assumptions used in developing DAC and amortization amounts each period include the amount of business in force, expected future persistency, withdrawals, interest rates and profitability. These assumptions are modified to reflect actual experience when appropriate. The amortization of DAC is charged to current earnings to the extent it is determined that future premiums or gross profits are not adequate to cover the remaining amounts deferred. DAC totaled $132.5 million and $100.0 million at December 31, 2004 and 2003, respectively.

DAC for group disability and group life insurance products are amortized in proportion to future premiums generally over five years. DAC for individual disability insurance products are amortized in proportion to future premiums over the life of the contract averaging 20 to 25 years with approximately 50% and 75% expected to be amortized by years 10 and 15, respectively. DAC for individual deferred annuities are amortized in proportion to expected gross profits generally over 30 years with approximately 50% to 90% expected to be amortized by years 5 and 15, respectively. DAC for group annuity products are amortized in proportion to expected gross profits over 10 years with approximately 30% expected to be amortized by year five.

VOBA primarily represents the discounted future profits of business assumed through reinsurance agreements. VOBA is amortized in proportion to future premiums or future profitability, as appropriate. If actual premiums or future profitability is inconsistent with our assumptions, we could be required to make adjustments to VOBA and related amortization. For the VOBA associated with the Minnesota Life block of business reinsured, the amortization period is up to 30 years. The amortization period of the intangible asset for the marketing agreement with Minnesota Life is 23 years. The VOBA associated with the TIAA transaction is comprised of two parts with differing amortization methods. The amortization periods are up to 10 years for VOBA that is amortized in proportion to premiums and up to 20 years for VOBA that is amortized in proportion to expected gross profits, although approximately 75% is expected to be amortized within 5 years, or by the end of 2007. VOBA totaled $86.3 million and $100.7 million at December 31, 2004 and 2003, respectively.

Income Taxes

The provision for income taxes includes amounts currently payable and deferred amounts that result from temporary differences between financial reporting and tax bases of assets and liabilities as measured by current tax rates. Income taxes for 2004 were reduced approximately $7 million related to the favorable resolution of uncertainties related to the Internal Revenue Service examination of the Company’s tax years through 2001, and favorable outcomes on state tax return matters. At December 31, 2004, years open for audit by the Internal Revenue Service were 2002, 2003 and 2004.

FORWARD-LOOKING STATEMENTS

Some of the statements contained in this MD&A, including those relating to our strategy and other statements that are predictive in nature, that depend on or refer to future events or conditions or that include words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “estimates” and similar expressions, are forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended. These statements are not historical facts but instead represent only management’s expectations, estimates and projections regarding future events. Similarly, these statements are not guarantees of future performance and involve uncertainties that are difficult to predict, which may include, but are not limited to, the factors discussed below. As a provider of financial products and services, our results of operations may vary significantly in response to economic trends, interest rate changes, investment performance and claims experience. Caution should be used when extrapolating historical results or conditions to future periods.

Our actual results and financial condition may differ, perhaps materially, from the anticipated results and financial condition in any such forward-looking statements and, accordingly, readers are cautioned not to place undue reliance on such statements. We undertake no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

The following factors could cause results to differ materially from management expectations as suggested by such forward-looking statements:

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Given these uncertainties or circumstances, readers are cautioned not to place undue reliance on these forward-looking statements. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

See Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Asset/Liability and Interest Rate Risk Management.”

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Part II

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Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders of

StanCorp Financial Group, Inc.

Portland, Oregon

We have audited the accompanying consolidated balance sheets of StanCorp Financial Group, Inc. and subsidiaries (the “Company”) as of December 31, 2004 and 2003, and the related consolidated statements of income and comprehensive income, changes in shareholders’ equity, and cash flows for each of the three years in the period ended December 31, 2004. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the financial statements and financial statement schedules based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of StanCorp Financial Group, Inc. and subsidiaries as of December 31, 2004 and 2003, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2004, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the effectiveness of the Company’s internal control over financial reporting as of December 31, 2004, based on the criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated March 10, 2005 expressed an unqualified opinion on management’s assessment of the effectiveness of the Company’s internal control over financial reporting and an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

Portland, Oregon

March 10, 2005

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Part II

Consolidated Statements of Income and Comprehensive Income