10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2011

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from            to            

Commission file number 0 - 10200

SEI INVESTMENTS COMPANY

(Exact name of registrant as specified in its charter)

Pennsylvania	23-1707341
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1 Freedom Valley Drive, Oaks, Pennsylvania	19456-1100
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code 610-676-1000

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

Title of each class	Name of each exchange on which registered
Common Stock, par value $.01 per share	The NASDAQ Stock Market LLC (The NASDAQ Global Select Market®)

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

None

(Title of class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yesx    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.    Yes  ¨    No  x

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 whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) 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 this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  x

The aggregate market value of the voting common stock held by non-affiliates of the registrant was approximately $3.2 billion based on the closing price of $22.51 as reported by NASDAQ on June 30, 2011 (the last business day of the registrant’s most recently completed second fiscal quarter). For purposes of making this calculation only, the registrant has defined affiliates as including all executive officers, directors and beneficial owners of more than ten percent of the common stock of the registrant.

The number of shares outstanding of the registrant’s common stock, as of the close of business on January 31, 2012:

Common Stock, $.01 par value 176,591,930

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the following documents are incorporated by reference herein:

1. The definitive proxy statement relating to the registrant’s 2012 Annual Meeting of Shareholders, to be filed within 120 days after the end of the fiscal year covered by this annual report, is incorporated by reference in Part III hereof.

SEI Investments Company

Fiscal Year Ended December 31, 2011

TABLE OF CONTENTS

		Page
PART I
Item 1.	Business.		2
Item 1A.	Risk Factors.		11
Item 1B.	Unresolved Staff Comments.		13
Item 2.	Properties.		13
Item 3.	Legal Proceedings.		13
Item 4.	Mine Safety Disclosures.		14
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.		15
Item 6.	Selected Financial Data.		16
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations.		17
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk.		35
Item 8.	Financial Statements and Supplementary Data.		36
Item 9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.		80
Item 9A.	Controls and Procedures.		80
Item 9B.	Other Information.		80
PART III
Item 10.	Directors, Executive Officers and Corporate Governance.		81
Item 11.	Executive Compensation.		82
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.		82
Item 13.	Certain Relationships and Related Transactions, and Director Independence.		84
Item 14.	Principal Accounting Fees and Services.		84
PART IV
Item 15.	Exhibits, Financial Statement Schedules.		85

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PART I

Forward Looking Statements

This Annual Report on Form 10-K contains certain “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements involve certain known and unknown risks, uncertainties and other factors, many of which are beyond our control, and are not limited to those discussed in Item 1A, “Risk Factors.” All statements that do not relate to historical or current facts are forward-looking statements. These statements may include words such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” and other words and terms of similar meaning in connection with any discussion of future operating or financial performance. In particular, these include statements relating to present or anticipated products and markets, future revenues, capital expenditures, expansion plans, future financing and liquidity, personnel, and other statements regarding matters that are not historical facts or statements of current condition.

Any or all forward-looking statements contained within this Annual Report on Form 10-K may turn out to be wrong. They can be affected by inaccurate assumptions we might make, or by known or unknown risks and uncertainties. Many factors mentioned in the discussion below will be important in determining future results. Consequently, we cannot guarantee any forward-looking statements. Actual future results may vary materially.

We undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law. You are advised, however, to consult any further disclosures we make on related subjects in our filings with the U.S. Securities and Exchange Commission (SEC).

Item 1. Business.

Overview

SEI (NASDAQ: SEIC) is a leading global provider of investment processing, investment management, and investment operations solutions. We help corporations, financial institutions, financial advisors, and ultra-high-net-worth families create and manage wealth by providing comprehensive, innovative, investment and investment-business solutions. As of December 31, 2011, through its subsidiaries and partnerships in which the company has a significant interest, SEI manages or administers $403.6 billion in mutual fund and pooled or separately managed assets, including $172.0 billion in assets under management and $231.6 billion in client assets under administration.

Our wealth management business solutions include:

• Investment processing outsourcing solutions for banks, trust companies, independent wealth advisers, and investment managers;

• Investment management programs for affluent individual investors and for institutional investors, including retirement plan sponsors, and not-for-profit organizations; and

• Investment operations outsourcing solutions for investment management firms, banks and investment companies that sponsor and distribute mutual funds, hedge funds, and alternative investments.

General Development of the Business

For over 40 years, SEI has been a leading provider of wealth management business solutions for the financial services industry.

We began doing business in 1968 by providing computer-based training simulations to instruct bank loan officers in credit lending practices. We developed an investment accounting system for bank trust departments in 1972, and became a leading provider of investment processing outsourcing services to banks and trust institutions.

SEI became a public company in 1981. In the 1980s, we entered the asset management business and launched a series of money market mutual funds. We also expanded our business processing outsourcing services to bank clients by providing mutual fund accounting services, and investment operations outsourcing services.

In the 1990s, we introduced our “Manager-of-Managers” investment process, and delivered these programs to investment advisors who manage wealth for their high-net-worth clients. We also began to provide asset

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management services to retirement plan sponsors and institutional investors in selected global markets, including the United States, Canada, the United Kingdom, continental Europe, South Africa and East Asia.

We have continued to deliver broader, more strategic solutions for clients and markets including a complete life and wealth platform for operating an investment advisory business, a total operational outsourcing solution for investment managers, a fully-integrated pension management system for retirement plan sponsors, and a complete life and wealth solution for ultra-high-net-worth families. Recently, we introduced Global Wealth Services, a next generation business solution integrating investment processing technology, operating processes, and investment management programs.

Strategy

We seek to achieve growth in earnings and shareholder value by strengthening our position as a provider of global wealth management solutions. To achieve this objective, we have implemented these strategies:

Create broader solutions for wealth service firms. Banks, investment managers and financial advisors seek to enter new markets, expand their service offerings, provide a differentiated experience to their clients, improve efficiencies, reduce risks, and better manage their businesses. We have developed and continue to develop next generation business solutions integrating technology, operating processes, and financial products designed to help these institutions better serve their clients and provide opportunities to improve their business success.

Help institutional investors manage retirement plans and operating capital. Retirement plan sponsors, not-for-profit organizations, and other institutional investors strive to meet their financial objectives while reducing business risk. We deliver customized investment management solutions, as part of a complete solution offering, that enable investors to make better decisions about their investments and to manage their assets more effectively.

Help affluent individual investors manage their life and wealth goals. These investors demand a holistic wealth management experience that focuses on their life goals and provides them with an integrated array of financial services that includes substantially more than traditional wealth management offerings. We help these investors identify their goals and offer comprehensive life and wealth advisory services including life planning, investments, and other financial services.

Expand globally. Global markets are large and present significant opportunities for growth. We have evolved U.S. business models for the global wealth management marketplace, focusing on the needs of institutional investors, private banks, independent wealth advisers, investment managers, investment advisors, and affluent individual investors.

Fundamental Principles

We are guided by these fundamental principles in managing the business and adopting these growth strategies:

• Achieve organic growth in revenue and earnings. We seek to grow the business by providing additional services to clients, adding new clients, introducing new products, and adapting products for new markets.

• Forge long-term client relationships. We strive to achieve high levels of customer satisfaction and to forge close and long lasting client relationships. We believe these relationships enable us to market additional services, and acquire knowledge and insights that fuel the product development process.

• Invest in product development. We continually enhance products and services to keep pace with industry developments, regulatory requirements, and the emerging needs of markets and clients. We believe ongoing investments in research and development give us a competitive advantage in our markets.

• Maintain financial strength. We adopt business models that generate recurring revenues and positive cash flows. Predictable cash flows serve as a source of funds for continuing operations, investments in new products, common stock repurchases, and dividend payments.

• Leverage investments across the business. We create scalable, enterprise-wide solutions designed to serve the needs of multiple markets, potentially offering operating efficiencies that can benefit corporate profitability.

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• Create value for shareholders. The objective of achieving long-term sustainable growth in revenues and earnings strongly influences the management of the business. This philosophy guides corporate management practices, strategic planning activities, and employee compensation practices.

Products and Services

Investment Processing

Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. We deliver these solutions to providers of institutional and private client wealth management services, including banks, trust companies, independent wealth advisers, and other financial services firms. We also deliver these solutions, combined with our investment management programs, to investment advisory firms and other financial services firms that provide wealth management services to their advisory clients.

Our investment processing solutions are enabled through two platforms, TRUST 3000® and the Global Wealth Platform. TRUST 3000® is a comprehensive trust accounting and investment system that provides securities processing and investment accounting for all types of domestic and global securities, and support for multiple account types, including personal trust, corporate trust, institutional trust, and non-trust investment accounts. The Global Wealth Platform is an investment accounting and securities processing system with capabilities that include global securities processing, trade-date and multi-currency accounting and reporting. The platform is designed around the client and portfolio management processes. This enables financial firms to institutionalize their client processes around an investor’s investment objectives, facilitating a transition to model-based portfolio management, providing an improved client experience, while minimizing the expense and risk associated with investment operations. The Global Wealth Platform also offers enhanced client experience capabilities and improved operating efficiencies. We began delivering the Global Wealth Platform to private banks and independent wealth advisers in the United Kingdom in 2007 and are currently preparing to deliver the platform to private banks and wealth managers in the United States.

Application and business process outsourcing revenues from investment processing services are earned as monthly fees from contracted services including software licenses, information processing, and investment operations. These revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, and are primarily earned based upon the type and number of investor accounts serviced. Investment processing revenues may also be earned as a percentage of the clients’ assets processed on the platforms. Professional services revenues are earned from contracted, project-oriented services, including client implementations, and are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Transaction-based revenues are earned from trade execution services and are recognized as Transaction-based and trade execution fees on the accompanying Consolidated Statements of Operations.

Investment Management Programs

Investment management programs consist of money market, fixed-income and equity mutual funds and other collective investment products, alternative investment portfolios, and separately managed accounts. We serve as the sponsor, administrator and investment advisor for many of these products. We distribute these programs primarily through investment advisory firms, including investment advisors and banks, and directly to institutional or individual investors.

We have expanded these investment management programs to include other consultative, operational, and technology components, and have created comprehensive solutions tailored to the needs of a specific market. These components may include investment strategies, consulting services, administrative and processing services, and technology tools.

Investors in our investment programs typically follow an investment strategy constructed according to our disciplined investment process and invest in a globally diversified portfolio that consists of multiple classes and investment styles. Our investment process is based on five principles: asset allocation and appropriate diversification, both of which are important to investment performance; a portfolio design process that identifies the drivers of investment returns for each asset class; manager selection, where we act as a manager-of-managers, selecting style-specific managers from a global network of money managers; a portfolio construction process implemented through selected managers, and properly diversified among asset classes and drivers of investment returns; and risk management processes that monitor portfolios to ensure risk objectives are met.

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As of December 31, 2011, we managed $118.3 billion in assets including: $92.7 billion invested in fixed-income and equity funds, or through separately managed account programs; $12.1 billion invested in liquidity or money market funds; and $13.5 billion invested in collective trust fund programs. An additional $53.7 billion in assets is managed by our unconsolidated affiliate LSV Asset Management (LSV), a registered investment advisor that specializes in value equity management for their institutional clients.

Revenues from investment management programs are primarily earned as a contractual percentage of net assets under management. These revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Our interest in the earnings of LSV is recognized in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.

Investment Operations

Investment operations outsourcing solutions consist of accounting and administration services, and distribution support services. We deliver these solutions to investment management firms that offer traditional and alternative products. We support traditional managers who advise a variety of investment products including mutual funds, UCITS schemes, collective investment trusts (CITs), exchange-traded funds (ETFs), institutional accounts and separately managed accounts. We also provide comprehensive solutions to investment managers worldwide that sponsor and distribute alternative investments such as hedge funds, funds of hedge funds, private equity funds and real estate funds, across both registered and partnership structures.

Accounting and administration services include account and fund administration, investment portfolio and fund accounting; cash administration and treasury services; trade capture, settlement and reconciliation; trustee and custodial services; legal, audit and tax support; and investor services. Distribution support services may include access to distribution platforms and market and industry analyses to identify specific product distribution opportunities. These solutions are delivered by utilizing a highly integrated, robust, and scalable technology platform adapted to fit the specific business needs of our investment manager clients.

As of December 31, 2011, we administered $231.6 billion in assets for traditional and alternative investment fund products, including mutual funds, CITs, hedge funds, and private equity funds. Revenues from these products are primarily earned based on a contractual percentage of net assets under administration.

Revenues for the processing of institutional separate accounts and separately managed accounts are generally earned on the number of investor accounts serviced. Assets associated with this separate account processing are not included in reported assets under administration. Both revenue categories are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Business Segments

Business segments are generally organized around our target markets. Financial information about each business segment is contained in Note 13 to the Consolidated Financial Statements. Our business segments are:

Private Banks – provides investment processing and investment management programs to banks and trust institutions worldwide, independent wealth advisers located in the United Kingdom, and financial advisors in Canada;

Investment Advisors – provides investment management programs to affluent investors through a network of independent registered investment advisors, financial planners, and other investment professionals in the United States;

Institutional Investors – provides investment management programs and administrative outsourcing solutions to retirement plan sponsors, hospitals, and not-for-profit organizations worldwide;

Investment Managers – provides investment operations outsourcing solutions to investment managers, fund companies and banking institutions located in the United States, and to investment managers worldwide of alternative asset classes such as hedge funds, funds of hedge funds, and private equity funds across both registered and partnership structures; and

Investments in New Businesses – provides investment management programs to ultra-high-net-worth families residing in the United States through the SEI Wealth Network® and conducts other research and development activities.

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The percentage of consolidated revenues generated by each business segment for the last three years was:

	2011			2010			2009
Private Banks		37	%		38	%		34	%
Investment Advisors		20	%		20	%		16	%
Institutional Investors		23	%		23	%		16	%
Investment Managers		19	%		18	%		13	%
Investments in New Businesses		1	%		1	%		1	%
LSV (1)		N/A			N/A			20	%
		100	%		100	%		100	%

(1) Beginning in 2010, we deconsolidated the assets, liabilities and operations of LSV Asset Management in our financial statements. As a result, LSV is no longer considered a reportable business segment.

Private Banks

The Private Banks segment delivers a comprehensive outsourcing solution integrating investment processing services, investment management and distribution programs, and business expertise to banks and trust institutions worldwide, independent wealth advisers and other wealth managers located in the United Kingdom, and financial advisors in Canada. Our investment processing solutions are provided to private banks and trust organizations in the United States through our TRUST 3000® platform and to private banks, independent wealth advisers and other wealth managers located in the United Kingdom through our Global Wealth Platform. We intend to provide investment processing solutions enabled by the Global Wealth Platform to private banks and wealth managers in the United States. We own, maintain and operate the software applications and information processing facilities for all of our investment processing solutions.

Private banks and other trust organizations in the United States who utilize our TRUST 3000® application solution outsource investment processing technology software and computer processing, but retain responsibility for investment operations, client administration, and investment management. These clients operate our TRUST 3000® application remotely while fully supported by our data center using dedicated telecommunications networks. The TRUST 3000® application solution includes a dedicated relationship team that supports our client’s business. We assist our clients by strategically evaluating their systems and process needs as their businesses change.

Our TRUST 3000® business solution was designed for private banks and other trust organizations in the United States that prefer to outsource their entire investment operation. With the TRUST 3000® business solution, we assume the entire back-office processing function. This comprehensive solution includes: investment processing; account access and reporting; audit, compliance and regulatory support data generation; custody and safekeeping of assets; income collections; securities settlement; and other related trust activities.

New clients undergo a business transformation process which can take a few months for smaller institutions and up to 15 months or more for larger institutions. During the transformation process, we collaborate with new clients to understand their strategic business goals and objectives. During this transformation, systems, operations, and business processes are evaluated and optimized to meet client objectives. We typically earn a one-time implementation fee for these business transformation services.

Client contracts for investment processing solutions offered through TRUST 3000® have initial terms that are generally three to seven years in length. At December 31, 2011, we had significant relationships with 113 banks and trust institutions in the United States. Our principal competitors for this business are: Fidelity National Information Services, Inc.; SunGard Data Systems Inc.; State Street Corporation; Fi-Tek LLC; and Pershing LLC, a subsidiary of The Bank of New York Mellon Corporation. Many large financial institutions develop, operate and maintain proprietary investment and trust accounting systems. We consider these “in-house” solutions to be a form of competition.

Investment processing solutions enabled by the Global Wealth Platform provide an integrated, scalable operating infrastructure allowing our clients to better adjust to the changing needs of their clients and their business by offering advanced global processing capabilities, client and portfolio management processes, an open-architecture, modular design, and continuous worldwide operation. The implementation of new clients onto the platform follows either a conversion of existing client assets or a business transition process which moves new client assets onto the platform as the client grows their business with a contractual minimum fee in place. Currently,

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these investment processing solutions offered through the Global Wealth Platform are only available to private banks, independent wealth advisers and other wealth managers located in the United Kingdom.

At December 31, 2011, we had significant relationships with 15 banks, independent wealth advisers and other wealth managers located in the United Kingdom. Our principal competitors for this business are: Temenos Group AG; FNZ UK Ltd.; Avaloq; TD Direct Investing (Europe) Ltd., and smaller technology firms. We also consider “in-house” solutions to be a form of competition.

Our investment management programs for banks and distribution partners are offered worldwide. At December 31, 2011, there were approximately 325 investment management clients worldwide. We also had single-product relationships with approximately 85 additional banks and trust institutions. The principal competitors for this business are: Federated Investors, Inc.; Russell Investment Group, a subsidiary of The Northwestern Mutual Life Insurance Company; Fidelity Investments; Franklin Templeton Investments; discretionary portfolio managers and various multi-manager investment programs offered by other firms. We also consider “in-house” internal asset management capabilities to be a form of competition.

Investment Advisors

The Investment Advisors segment offers wealth management solutions to registered investment advisors, many of whom are affiliated with or are registered as independent broker-dealers, financial planners, and life insurance agents located throughout the United States. These wealth management solutions include our investment management programs and back-office investment processing outsourcing services and are usually offered on a bundled basis. We also help advisors manage and grow their businesses by giving them access to our marketing support programs, business assessment assistance and recommended management practices. Our solutions aim to help investment advisors reduce risk, improve quality, and gain operational efficiency to devote more of their resources to servicing their clients and acquiring new clients.

Advisors are responsible for the investor relationship which includes creating financial plans, implementing investment strategies and educating and servicing their customers. Advisors may customize portfolios to include separate account managers provided through our programs as well as SEI-sponsored mutual funds. Our wealth and investment programs are designed to be attractive to affluent or high-net-worth individual investors with over $250 thousand of investable assets and small to medium-sized institutional plans.

We continually enhance our offering to meet the emerging needs of our advisors and their end clients. For example, in September 2011, we converted a small, select group of advisors onto the Global Wealth Platform. We expect to continue the rollout in 2012 and 2013. We anticipate the enhanced service offerings enabled through the Global Wealth Platform will provide a more diverse range of back-office investment processing outsourcing services and investment management solutions.

We estimate we have business relationships with over 4,900 financial advisors at December 31, 2011. In 2011, we modified our definition of a client for this segment and only include financial advisors who have exceeded a minimal level of customer assets invested in our investment products. Our business is primarily based on approximately 1,000 investment advisors who, at December 31, 2011, had at least $5.0 million each in customer assets invested in our mutual funds and separately managed accounts. Revenues are earned largely as a percentage of average assets under management.

The principal competition for our investment management products is from other money managers, other turnkey asset management providers, mutual fund companies and custody service providers. In the advisor distributor channel, the principal competitors include AssetMark Investment Services Inc., Brinker Capital, EnvestNet Asset Management, Inc., Fidelity Investments, Lockwood Advisors, Inc., a subsidiary of The Bank of New York Mellon, Charles Schwab & Co., Inc., and other broker-dealers. As we introduce the Global Wealth Platform, we expect to more directly compete with custody service providers.

Institutional Investors

The Institutional Investors segment offers investment management programs and administrative outsourcing solutions for retirement plan sponsors, hospitals, and not-for-profit organizations globally. Clients can outsource their investment management needs and the administration for defined benefit plans, defined contribution plans, endowments, foundations and other balance sheet assets, as well as the administration of endowment and foundation asset pools.

The fiduciary management outsourcing program provides a strategic platform integrating the Manager-of-Managers investment process, plan administration services, and consulting services. Plan administration services include trustee, custodial, benefit payment services, record-keeping services, and donor administration.

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Consulting services include actuarial services, asset liability modeling, and the customization of an asset allocation plan that is designed to meet long-term objectives.

By outsourcing retirement plan services, we believe clients benefit from an investment approach built around an investment strategy designed to meet the client’s long-term business and plan objectives and an investment process that removes the responsibility of manager selection, ongoing monitoring and termination. This approach is designed to reduce business risk, provide ongoing due diligence, and increase operational efficiency. Nonprofit organizations can manage volatility through more diversified portfolios and focus more resources on achieving their overall mission. Healthcare organizations benefit from customized asset allocations that help provide improved balance sheet protection and overall financial risk management.

Fees are primarily earned as a percentage of average assets under management. At December 31, 2011, we had relationships with approximately 475 investment management clients. In 2011, we modified our definition of a client for this segment and no longer include relationships which solely consist of our liquidity management products. The principal competitors for this segment are Frank Russell Company, a subsidiary of The Northwestern Mutual Life Insurance Company, Northern Trust Corporation, and investment consultants. We also consider consulting firms with investment advisory or actuarial capabilities who offer discretionary management services to be competitors.

Investment Managers

The Investment Managers segment provides comprehensive investment operations outsourcing solutions to investment managers globally. This array of front-, middle- and back-office investment processing services integrate best-in-class industry tools and technology to support a manager’s diverse business needs across multiple products and asset classes. We offer managers a diverse suite of services for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. We also provide comprehensive solutions to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas.

Over the past few years, investors have had to face multiple market crises and rising volatility. Fund managers have responded with a range of innovative products designed to better manage volatility and offer alternatives to pure long-only investing historically used in traditional markets. The clear line that had once separated traditional and alternative investment products has blurred significantly. Anticipating this long-term trend and that of an increasingly empowered investor base, we have focused on the needs of the investor and manager rather than provide services aligned to specific products or asset classes. We also continually enhance our solutions to anticipate and adapt to economic, regulatory and industry changes.

By applying operating services, market-leading technologies, and business and regulatory knowledge, our comprehensive array of investment operations solutions help investment managers focus on their core competencies of portfolio management and client service. We provide managers with more than just the required data they need to run their investment products successfully; we also strive to deliver the information and insight necessary to allow them to better manage their business.

Contracts for our investment operations outsourcing services generally have terms ranging from three to five years. Fees for the business segment are primarily earned as a percentage of average assets under management and administration. A portion of the revenues for this segment are earned as account servicing fees. At December 31, 2011, we had relationships with approximately 200 investment management companies and alternative investment managers. Our competitors vary according to the asset class or solution provided and include large global custodian banks such as State Street Bank and Trust Company, Citicorp and BNY Mellon and smaller more specialized firms.

Investments in New Businesses

The Investments in New Businesses segment represents other business ventures or research and development activities intended to expand our solutions to new or existing markets including ultra-high-net-worth families who reside in the United States. This segment includes the costs associated with business development in the Middle East through our Dubai office and the development of a new internet-based investment management application. The family wealth management solution offers flexible family-office type services through a highly personalized solution while utilizing the Manager-of-Managers investment process.

The principal competitors for the family wealth solution are diversified financial services providers focused on the ultra-high-net-worth market.

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Research and Development

We are devoting significant resources to research and development, including expenditures for new technology platforms, enhancements to existing technology platforms, and new investment products and services. We spent approximately $118.6 million in 2011, $105.6 million in 2010, and $103.9 million in 2009, of which we capitalized approximately $41.0 million in 2011, $38.7 million in 2010, and $43.9 million in 2009 relating to the development of new technology platforms. Total research and development expenditures as a percentage of revenues were 12.8 percent in 2011, 11.7 percent in 2010, and 12.2 percent in 2009. All percentages exclude the revenues of LSV.

The majority of our research and development spending is related to building our Global Wealth Platform (GWP). GWP combines business service processing with asset management and distribution services. The platform offers to our customers a client-centric, rather than an account-centric, process with model-based portfolio management services through a single platform. The platform utilizes our proprietary applications with those built by third-party providers, and integrates them into a single technology solution, providing a common user experience. This integration supports straight-through business processing and enables the transformation of our clients’ trust services from operational investment processing services to client value-added services.

The solution will serve markets in the United Kingdom, United States, Canada and continental European markets. GWP provides the technology platform for the business solutions now being marketed to private banks and independent wealth adviser organizations in the United Kingdom. In U.S. markets, we believe the demand for the advanced capabilities of the new platform will enable us to market our services to global wealth managers and existing clients in the Private Banks segment and significantly extend, expand and improve the services we offer in the Investment Advisors segment. We have implemented a small, select group of advisors in the United States onto the platform and plan to provide a new suite of services not previously offered to an additional select group in 2012. This new suite of services also positions us to start the implementation of our first U.S. bank client.

GWP will eventually be used at some level by all business segments representing a significant upgrade to our infrastructure. The platform will enable both SEI and our clients to manage the entire lifecycle of wealth services through a single solution. The workflow automation, firm’s business rules and straight through processing to the street will dramatically change the client experience, help firms manage risk and allow for total transparency.

Marketing and Sales

Our business solutions are directly marketed to potential clients in our target markets. We employ approximately 90 sales representatives who operate from offices located throughout the United States, Canada, the United Kingdom, continental Europe, South Africa, Asia and other locations.

Customers

In 2011, no single customer accounted for more than ten percent of revenues in any business segment.

Personnel

At January 31, 2012, we had approximately 2,365 full-time and 65 part-time employees. None of our employees is unionized. Management considers employee relations to be generally good.

Regulatory Considerations

SEI is a savings and loan holding company subject to supervision and regulation by the Federal Reserve. SEI is not subject to specific statutory capital requirements. However, SEI is required to maintain capital that is sufficient to support the holding company and its subsidiaries’ business activities, and the risks inherent in those activities. To manage capital adequacy, SEI currently utilizes a target Tier 1 Leverage Ratio as defined by the Board of Governors of the Federal Reserve System.

Our principal, regulated wholly-owned subsidiaries are SEI Investments Distribution Co., or SIDCO, SEI Investments Management Corporation, or SIMC, SEI Private Trust Company, or SPTC, SEI Trust Company, or STC, and SEI Investments (Europe) Limited, or SIEL. SIDCO is a broker-dealer registered with the SEC under the Securities and Exchange Act of 1934 and is a member of the Financial Industry Regulatory Authority, Inc. (FINRA). SIMC is an investment advisor registered with the SEC under the Investment Advisers Act of 1940. SPTC is a limited purpose federal thrift chartered and regulated by the Office of the Comptroller of the Currency. STC is a Pennsylvania trust company, regulated by the Pennsylvania Department of Banking. SIEL is an investment manager and financial institution subject to regulation by the Financial Services Authority of the United Kingdom. In addition, various SEI subsidiaries are subject to the jurisdiction of regulatory authorities in Canada, the Republic of Ireland and other foreign countries. The Company has a minority ownership interest in LSV, which is also an investment advisor registered with the SEC.

The Company, its regulated subsidiaries, their regulated services and solutions and their customers are all subject to extensive legislation, regulation and supervision that recently has been subject to, and continues to experience, significant change and increased regulatory activity. These changes and regulatory activities could have a material adverse affect on us and our clients.

The various governmental agencies and self-regulatory authorities that regulate or supervise the Company and various of its subsidiaries have broad administrative powers. In the event of a failure to comply with laws, regulations and requirements of these agencies and authorities, the possible sanctions that may be imposed include the suspension of individual employees, limitations on our ability to engage in business for specified periods of time, the revocation of applicable registration as a broker-dealer, investment advisor or other regulated entity, and, as the case may be, censures and fines. Additionally, certain securities and banking laws applicable to us and our subsidiaries provide for certain private rights of action that could give rise to civil litigation. Any litigation could have significant financial and non-financial consequences including monetary judgments and the requirement to take action or limit activities that could ultimately affect our business.

Governmental scrutiny from regulators, legislative bodies and law enforcement agencies with respect to matters relating to our regulated subsidiaries and their activities, services and solutions, our business practices, our past actions and other matters has increased dramatically in the past several years. Responding to these examinations, investigations, actions and lawsuits, regardless of the ultimate outcome of the proceeding, is time consuming and expensive and can divert the time and effort of our senior management from our business. Penalties and fines sought by regulatory authorities have increased substantially over the last several years, and certain regulators have been more likely in recent years to commence enforcement actions or to advance or support legislation targeted at the financial services industry. Governmental scrutiny and legal and enforcement proceedings can also have a negative impact on our reputation and on the morale and performance of our employees, which could adversely affect our businesses and results of operations.

We are subject to the USA PATRIOT Act of 2001, which contains anti-money laundering and financial transparency laws and requires implementation of regulations applicable to financial services companies, including standards for verifying client identification and monitoring client transactions and detecting and reporting suspicious activities. Anti-money laundering laws outside the United States contain similar requirements.

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We offer investment and banking solutions that also are subject to regulation by the federal and state securities and banking authorities, as well as foreign regulatory authorities, where applicable. Existing or future regulations that affect these solutions could lead to a reduction in sales of these solutions or require modifications of these solutions.

Compliance with existing and future regulations and responding to and complying with recent increased regulatory activity affecting broker-dealers, investment advisors, investment companies, financial institutions and their service providers could have a significant impact on us. We periodically undergo regulatory examinations and respond to regulatory inquiries and document requests. In addition, recent legislative activity in the United States (including the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 and attendant rule making activities) and in other jurisdictions (including the European Union and the United Kingdom) have made and continue to make, extensive changes to the laws regulating financial services firms. As a result of these examinations, inquiries and requests, as a result of increased civil litigation activity, and as a result of these new laws and regulations, we engage legal counsel, review our compliance procedures, solution and service offerings, and business operations, and make changes as we deem necessary. These additional activities and required changes may result in increased expense or may reduce revenues.

Our bank clients are subject to supervision by federal and state banking authorities concerning the manner in which such clients purchase and receive our products and services. Our plan sponsor clients and our subsidiaries providing services to those clients are subject to supervision by the Department of Labor and compliance with employee benefit regulations. Investment advisor and broker-dealer clients are regulated by the SEC, state securities authorities, or FINRA. Existing or future regulations applicable to our clients may affect our clients’ purchase of our products and services.

In addition, see the discussion of governmental regulations in Item 1A “Risk Factors” for a description of the risks that proposed regulatory changes may present for our business.

Available Information

We maintain a website at www.seic.com and make available free of charge through the Investors section of this website our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and all

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amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. We include our website in this Annual Report on Form 10-K only as an inactive textual reference and do not intend it to be an active link to our website. The material on our website is not part of this Annual Report on Form 10-K.

Item 1A. Risk Factors.

We believe that the risks and uncertainties described below are those that impose the greatest threat to the sustainability of our business. However, there are other risks and uncertainties that exist that may be unknown to us or, in the present opinion of our management, do not currently pose a material risk of harm to us. The risk and uncertainties facing our business, including those described below, could materially adversely affect our business, results of operations, financial condition and liquidity.

Our revenues and earnings are affected by changes in capital markets. A majority of our revenues are earned based on the value of assets invested in investment products that we manage or administer. Significant fluctuations in securities prices may materially affect the value of these assets and may also influence an investor’s decision to invest in and maintain an investment in a mutual fund or other investment product. As a result, our revenues and earnings derived from assets under management and administration could be adversely affected.

A majority of the securities held by our investment products are valued using quoted prices from active markets gathered by external pricing services. Securities for which market prices are not readily available are valued in accordance with procedures applicable to that investment product. These procedures may utilize unobservable inputs that are not gathered from any active markets and involve considerable judgment. If these valuations prove to be inaccurate, our revenues and earnings from assets under management could be adversely affected.

We are exposed to product development risk. We continually strive to increase revenues and meet our customers’ needs by introducing new products and services. As a result, we are subject to product development risk, which may result in loss if we are unable to develop and deliver fully functional products to our target markets that address our clients’ needs and that are developed on a timely basis and reflect an attractive value proposition. New product development is primarily for the purpose of enhancing our competitive position in the industry. In the event that we fail to develop products or services at an acceptable cost or on a timely basis or if we fail to deliver functional products and services which are of sound, economic value to our clients and our target markets, or an inability to support the product in a cost-effective manner, we could suffer significant financial loss.

Consolidation within our target markets may affect our business. Merger and acquisition activity between banks and other financial institutions could reduce the number of existing and prospective clients or reduce the amount of revenue we receive from retained clients. Consolidation activities may also cause larger institutions to internalize some or all of our services. These factors may negatively impact our ability to generate future growth in revenues and earnings.

We are dependent upon third-party service providers in our operations. We utilize numerous third-party service providers located in the United States and offshore locations in our operations, in the development of new products, and in the maintenance of our proprietary systems. A failure by a third-party service provider could expose us to an inability to provide contractual services to our clients in a timely basis. Additionally, if a third-party service provider is unable to provide these services, we may incur significant costs to either internalize some of these services or find a suitable alternative.

We serve as the investment advisor for many of the products offered through our investment management programs and utilize the services of investment sub-advisers to manage the majority of these assets. A failure in the performance of our due diligence processes and controls related to the supervision and oversight of these firms in detecting and addressing conflicts of interest, fraudulent activity, noncompliance with relevant securities and other laws could cause us to suffer financial loss, regulatory sanctions or damage to our reputation.

Poor fund performance may affect our revenues and earnings. Our ability to maintain our existing clients and attract new clients may be negatively affected if the performance of our mutual funds and other investment products, relative to market conditions and other comparable competitive investment products, is lower. Investors may decide to place their investable funds elsewhere which would reduce the amount of assets we manage resulting in a decrease in our revenues.

Our Company and our clients are subject to extensive governmental regulation. Our various business activities are conducted through entities which may be registered with or regulated by the Securities and Exchange Commission (SEC) as an investment advisor, a broker-dealer, a transfer agent, or an investment company, with

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federal or state banking authorities as a trust company, or with federal banking authorities as a savings association holding company. Our broker-dealer is also a member of the Financial Industry Regulatory Authority and is subject to its rules and oversight. In addition, some of our foreign subsidiaries are registered with, and subject to the oversight of, regulatory authorities primarily in the United Kingdom, the Republic of Ireland and Canada. Many of our clients are subject to substantial regulation by federal and state banking, securities or insurance authorities or the Department of Labor. Compliance with existing and future regulations, responding to and complying with recent regulatory activity affecting broker-dealers, investment advisors, investment companies and their service providers and financial institutions, and examination or other supervisory activities of our regulators or of the regulators of our clients, could have a significant impact on our operations or business.

We offer investment and banking products that also are subject to regulation by the federal and state securities and banking authorities, as well as foreign regulatory authorities, where applicable. Existing or future regulations that affect these products could lead to a reduction in sales of these products or an increase in the cost of providing these products.

The fees and assessments imposed on our regulated subsidiaries by federal, state and foreign regulatory authorities could have a significant impact on us. In the current regulatory environment, the frequency and scope of regulatory reform may lead to an increase in fees and assessments resulting in increased expense, or an increase or change in regulatory requirements which could affect our operations and business.

We are exposed to systems and technology risks. Through our proprietary systems, we maintain and process data for our clients that is critical to their business operations. An unanticipated interruption of service may have significant ramifications, such as lost data, damaged software codes, or inaccurate processing of transactions. As a result, the costs necessary to rectify these problems may be substantial.

We are exposed to data security risks. A failure to safeguard the integrity and confidentiality of client data and our proprietary data from the infiltration by an unauthorized user that is either stored on or transmitted between our proprietary systems or to other third party service provider systems may lead to modifications or theft of critical and sensitive data pertaining to us or our clients. The costs incurred to correct client data and prevent further unauthorized access to our data or client data could be extensive.

We are dependent upon third party approvals. Many of the investment advisors through which we distribute our investment offerings are affiliated with independent broker-dealers or other networks, which have regulatory responsibility for the advisor’s practice. As part of the regulatory oversight, these broker-dealers or networks must approve the use of our investment products by affiliated advisors within their networks. Failure to receive such approval, or the withdrawal of such approval, could adversely affect the marketing of our investment products.

We are exposed to operational risks. Operational risk generally refers to the risk of loss resulting from our operations, including, but not limited to, improper or unauthorized execution and processing of transactions, deficiencies in our operating systems, inefficiencies in our operational business units, business disruptions and inadequacies or breaches in our internal control processes. We operate different businesses in diverse markets and are reliant on the ability of our employees and systems to process large volumes of transactions often within short time frames. In the event of a breakdown or improper operation of systems, human error or improper action by employees, we could suffer financial loss, regulatory sanctions or damage to our reputation. In order to mitigate and control operational risk, we continue to enhance policies and procedures that are designed to identify and manage operational risk.

Changes in, or interpretation of, accounting principles could affect our revenues and earnings. We prepare our consolidated financial statements in accordance with generally accepted accounting principles. A change in these principles can have a significant effect on our reported results and may even retrospectively affect previously reported results.

Changes in, or interpretations of, tax rules and regulations may adversely affect our effective tax rates. Unanticipated changes in our tax rates could affect our future results of operations. Our future effective tax rates could be adversely affected by changes in tax laws or the interpretation of tax laws. We are subject to possible examinations of our income tax returns by the Internal Revenue Service and state and foreign tax authorities. We regularly assess the likelihood of outcomes resulting from these examinations to determine the adequacy of our provision for income taxes, however, there can be no assurance that the final determination of any examination will not have an adverse effect on our operating results or financial position.

Currency fluctuations could negatively affect our future revenues and earnings as our business grows globally. We operate and invest globally to expand our business into foreign markets. Our foreign subsidiaries use the

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local currency as the functional currency. As these businesses evolve, our exposure to changes in currency exchange rates may increase. Adverse movements in currency exchange rates may negatively affect our operating results, liquidity and financial condition.

We rely on our executive officers and senior management. Most of our executive officers and senior management personnel do not have employment agreements with us. The loss of these individuals may have a material adverse affect on our future operations.

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

Our corporate headquarters is located in Oaks, Pennsylvania and consists of nine buildings situated on approximately 90 acres. We own and operate the land and buildings, which encompass approximately 486,000 square feet of office space and 34,000 square feet of data center space. We lease other offices which aggregate 58,000 square feet. We also own a 3,400 square foot condominium that is used for business purposes in New York, New York.

Item 3. Legal Proceedings.

One of SEI’s principal subsidiaries, SIDCO, has been named as a defendant in certain putative class action complaints (the Complaints) related to leveraged exchange traded funds (ETFs) advised by ProShares Advisors, LLC. The first complaint was filed on August 5, 2009. To date, the Complaints have been filed in the United States District Court for the Southern District of New York and in the United States District Court for the District of Maryland. The three complaints filed in the District of Maryland have been voluntarily dismissed by the plaintiffs. Two of them were subsequently re-filed in the Southern District of New York. Two of the complaints filed in the Southern District of New York have also been voluntarily dismissed by plaintiffs. The Complaints are purportedly made on behalf of all persons that purchased or otherwise acquired shares in various ProShares leveraged ETFs pursuant or traceable to allegedly false and misleading registration statements, prospectuses and statements of additional information. The Complaints name as defendants ProShares Advisors, LLC; ProShares Trust; ProShares Trust II, SIDCO, and various officers and trustees to ProShares Advisors, LLC; ProShares Trust and ProShares Trust II. The Complaints allege that SIDCO was the distributor and principal underwriter for the various ProShares leveraged ETFs that were distributed to authorized participants and ultimately shareholders. The complaints allege that the registration statements for the ProShares ETFs were materially false and misleading because they failed adequately to describe the nature and risks of the investments. The Complaints allege that SIDCO is liable for these purportedly material misstatements and omissions under Section 11 of the Securities Act of 1933. The Complaints seek unspecified compensatory and other damages, reasonable costs and other relief. Defendants have moved to consolidate the complaints, which motion has been granted. The Court appointed lead plaintiff on July 13, 2010, and an amended consolidated class action complaint was filed on September 25, 2010 asserting substantially the same claims. Defendants moved to dismiss on November 15, 2010. On December 16, 2010, lead plaintiff informed the Court and Defendants that lead plaintiff elected to file a second amended consolidated complaint, which was filed on January 31, 2011. Defendants filed a motion to dismiss the second complaint on March 17, 2011. Oral argument on this motion was held on February 2, 2012. While the outcome of this litigation is uncertain given its early phase, SEI believes that it has valid defenses to plaintiffs’ claims and intends to defend the lawsuits vigorously.

SEI has been named in six lawsuits filed in Louisiana. Five lawsuits were filed in the 19th Judicial District Court for the Parish of East Baton Rouge, State of Louisiana. One of the five actions purports to set forth claims on behalf of a class and also names SPTC as a defendant. Two of the other actions also name SPTC as a defendant. All five actions name various defendants in addition to SEI, and, in all five actions, the plaintiffs purport to bring a cause of action under the Louisiana Securities Act. The putative class action originally included a claim against SEI and SPTC for an alleged violation of the Louisiana Unfair Trade Practices Act. Two of the other five actions include claims for violations of the Louisiana Racketeering Act and possibly conspiracy. In addition, another group of plaintiffs have filed a lawsuit in the 23rd Judicial District Court for the Parish of Ascension, State of Louisiana, against SEI and SPTC and other defendants asserting claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Securities Act and Louisiana Racketeering Act and conspiracy. The underlying allegations in all the actions are purportedly related to the role of SPTC in providing back-office services to Stanford Trust Company. The petitions allege that SEI and SPTC aided and abetted or otherwise participated in the sale of “certificates of deposit” issued by Stanford International Bank. Two of the five actions filed in East Baton Rouge have been removed to federal court, and plaintiffs’ motions to remand are pending. These two cases have been transferred by the Judicial Panel on Multidistrict Litigation to United States District Court for the Northern District of Texas. On August 31, 2011, the United States District Court for the Northern District of Texas issued an order and judgment that the causes of action alleged against SEI and SPTC in the two remanded actions were preempted by federal law and the Court dismissed these cases with prejudice. The Court of Appeals for the Fifth Circuit has granted an expedited appeal of the United States District Court’s order and judgment. The appeal has been fully briefed, and oral argument was held on February 7, 2012. The case filed in Ascension was also removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas. The schedule for responding to that complaint has not yet been established. The plaintiffs in the remaining two cases in East Baton Rouge have granted SEI an extension to respond to the filings. SEI and SPTC filed exceptions in the putative class action pending in East Baton Rouge, which the Court granted in part and dismissed the claims under the Louisiana Unfair Trade Practices Act and denied in part as to the other

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exceptions. SEI and SPTC filed an answer to the East Baton Rouge putative class action; plaintiffs filed a motion for class certification; and SEI and SPTC also filed a motion for summary judgment against certain named plaintiffs which the Court stated will not be set for hearing until after the hearing on the class certification motion. Following the decision by the United States District Court for the Northern District of Texas, the Court in the East Baton Rouge action issued an order staying the proceedings in the East Baton Rouge class action pending the outcome of the appeal of the order and judgment of the United States District Court for the Northern District of Texas. While the outcome of this litigation is uncertain given its early phase, SEI and SPTC believe that they have valid defenses to plaintiffs’ claims and intend to defend the lawsuits vigorously.

Because of the uncertainty of the make-up of the classes, the specific theories of liability that may survive a motion to dismiss, the lack of discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the foregoing lawsuits.

Executive Officers of the Registrant

Information about our executive officers is contained in Item 10 of this report and is incorporated by reference into this Part I.

Item 4. Mine Safety Disclosures.

None.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Price Range of Common Stock and Dividends:

Our common stock is traded on The Nasdaq Global Select Market® (NASDAQ) under the symbol “SEIC.” The following table shows the high and low sales prices for our common stock as reported by NASDAQ and the dividends declared on our common stock for the last two years. Our Board of Directors intends to declare future dividends on a semiannual basis.

2011	High		Low		Dividends
First Quarter	$	24.87	$	21.64	$	—
Second Quarter		24.24		21.19		.12
Third Quarter		23.11		14.63		—
Fourth Quarter		17.52		13.73		.15

2010	High		Low		Dividends
First Quarter	$	22.12	$	16.77	$	—
Second Quarter		24.41		19.93		.10
Third Quarter		22.14		17.35		—
Fourth Quarter		24.28		20.07		.10

As of January 31, 2012, we estimate that we had approximately 400 shareholders of record.

For information on our equity compensation plans, refer to Note 8 to the Consolidated Financial Statements and Item 12 of this Annual Report on Form 10-K.

Comparison of Cumulative Total Return of Common Stock, Industry Index and Nasdaq Market Index:

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Issuer Purchases of Equity Securities:

Our Board of Directors has authorized, under multiple authorizations, the repurchase of up to $1.928 billion of our common stock. Currently, there is no expiration date for our common stock repurchase program.

Information regarding the repurchase of common stock during the three months ended December 31, 2011 is:

Period	Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Program		Approximate Dollar Value of Shares that May Yet Be Purchased Under the Program
October 1 – 31, 2011		850,000	$	16.09		850,000	$	35,079,000
November 1 – 30, 2011		1,400,000		16.09		1,400,000		12,559,000
December 1 – 31, 2011		975,000		16.70		975,000		96,276,000
Total		3,225,000	$	16.27		3,225,000

Item 6. Selected Financial Data.

(In thousands, except per-share data)

This table presents selected consolidated financial information for the five-year period ended December 31, 2011. This data should be read in conjunction with the financial statements and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in this Annual Report on Form 10-K.

Year Ended December 31,	2011			2010 (A)			2009			2008			2007
Revenues	$	929,727		$	900,835		$	1,060,548		$	1,247,919		$	1,369,028
Total expenses		725,662			683,302			696,841			751,570			775,053
Income from operations		204,065			217,533			363,707			496,349			593,975
Other income (expense)		114,422			152,248			(1,389	)		(142,119	)		(8,556	)
Income before income taxes		318,487			369,781			362,318			354,230			585,419
Income taxes		111,837			136,461			89,886			86,703			151,182
Net income		206,650			233,320			272,432			267,527			434,237
Less: Net income attributable to the noncontrolling interest		(1,691	)		(1,633	)		(98,097	)		(128,273	)		(174,428	)
Net income attributable to SEI Investments		204,959			231,687			174,335			139,254			259,809
Basic earnings per common share	$	1.12		$	1.23		$	0.91		$	0.73		$	1.32
Shares used to calculate basic earnings per common share		182,547			188,468			190,821			192,057			196,120
Diluted earnings per common share	$	1.11		$	1.22		$	0.91		$	0.71		$	1.28
Shares used to calculate diluted earnings per common share		184,127			190,321			191,783			195,233			202,231
Cash dividends declared per common share	$	.27		$	.20		$	.17		$	.16		$	.14
Financial Position as of December 31,
Cash and cash equivalents	$	420,986		$	496,292		$	590,877		$	416,643		$	360,921
Total assets	$	1,294,559		$	1,377,223		$	1,533,808		$	1,341,715		$	1,252,365
Long-term debt (including current portion)	$	0		$	95,000		$	253,552		$	31,532		$	51,971
SEI Investments Shareholders’ equity	$	1,025,316		$	1,041,570		$	909,723		$	769,152		$	756,383

(A) Beginning in 2010, we discontinued consolidating the accounts and operations of LSV and LSV Employee Group in our financial statements (See Note 2 to the Consolidated Financial Statements for information regarding LSV and LSV Employee Group).

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

(In thousands, except per-share data)

This discussion reviews and analyzes the consolidated financial condition at December 31, 2011 and 2010, the consolidated results of operations for the years ended December 31, 2011, 2010, and 2009, and other factors that may affect future financial performance. This discussion should be read in conjunction with the Selected Financial Data included in Item 6 of this Annual Report and the Consolidated Financial Statements and Notes to the Consolidated Financial Statements included in Item 8 of this Annual Report.

Overview

Consolidated Summary

We are a leading global provider of investment processing, investment management, and investment operations solutions. We help corporations, financial institutions, financial advisors, and ultra-high-net-worth families create and manage wealth by providing comprehensive, innovative, investment and investment-business solutions. Investment processing fees are earned as monthly fees for contracted services, including computer processing services, software licenses, and investment operations services, as well as transaction-based fees for providing securities valuation and trade-execution. Investment operations and investment management fees are earned as a percentage of average assets under management or administration. As of December 31, 2011, through our subsidiaries and partnerships in which we have a significant interest, we manage or administer $403.6 billion in mutual fund and pooled or separately managed assets, including $172.0 billion in assets under management and $231.6 billion in client assets under administration.

Our Condensed Consolidated Statements of Operations for the years ended 2011, 2010 and 2009 were:

Year Ended December 31,	2011			2010 (A)			Percent Change			2009			Percent Change
Revenues	$	929,727		$	900,835			3	%	$	1,060,548			(15	%)
Expenses		725,662			683,302			6	%		696,841			(2	%)
Income from operations		204,065			217,533			(6	%)		363,707			(40	%)
Net gain (loss) from investments		3,360			48,533			(93	%)		(4,926	)		N/A
Interest income, net of interest expense		5,244			4,848			8	%		3,537			37	%
Other expense, net		0			(590	)		N/A			0			N/A
Equity in earnings of unconsolidated affiliate		105,818			99,457			6	%		0			N/A
Income before income taxes		318,487			369,781			(14	%)		362,318			2	%
Income taxes		111,837			136,461			(18	%)		89,886			52	%
Net income		206,650			233,320			(11	%)		272,432			(14	%)
Less: Net income attributable to the noncontrolling interest		(1,691	)		(1,633	)		4	%		(98,097	)		N/A
Net income attributable to SEI Investments Company	$	204,959		$	231,687			(12	%)	$	174,335			33	%
Diluted earnings per common share	$	1.11		$	1.22			(9	%)	$	.91			34	%

(A) Beginning in 2010, we discontinued consolidating the accounts and operations of LSV and LSV Employee Group in our financial statements (See Note 2 to the Consolidated Financial Statements).

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Significant Items Impacting Our Financial Results in 2011

Revenues increased $28.9 million, or three percent, to $929.7 million in 2011 compared to 2010. Net income attributable to SEI decreased $26.7 million, or 12 percent, to $205.0 million and diluted earnings per share decreased to $1.11 per share in 2011 compared to $1.22 per share in 2010. We believe the following items were significant to our business during 2011:

• Revenue growth was primarily driven by higher Asset management, administration and distribution fees across the business segments from improved capital market conditions. The majority of our asset-based revenues are based upon average assets, which increased during the year despite the sharp decline experienced during the third quarter. Our average assets under management, excluding LSV, increased $9.8 billion, or nine percent, to $117.0 billion during the year as compared to $107.2 billion during 2010.

• New business coupled with asset funding from existing clients for our hedge fund solutions and increased accounts for our separately managed accounts solutions in our Investment Managers segment also served to drive revenue growth.

• Revenues in our Private Banks segment were negatively impacted by lower investment processing fees from price reductions provided to existing clients that recontracted for longer periods, lower transaction volumes and lower one-time project-related fees. Furthermore, the full impact of previously-announced client losses in the segment were reflected in 2011 as the associated recurring and one-time revenues from the client losses were recognized in the preceding year.

• Our proportionate share in the earnings of LSV in 2011 was $105.8 million as compared to $99.5 million in 2010, an increase of six percent. The net market appreciation in LSV’s average assets under management during the first half of 2011 as well as increased performance fees resulted in an overall increase in their revenues. Although ending assets under management declined to $53.7 billion, LSV’s average assets under management increased $5.2 billion, or ten percent, to $58.5 billion during the year as compared to $53.3 billion during the prior year.

• Our operating expenses related to servicing new and existing clients of our Global Wealth Services solution implemented on the Global Wealth Platform has increased as we continue to build out the operational infrastructure and add new functionality to the platform. A higher portion of these costs are not capitalized. These increased operational costs primarily impacted the Private Banks and Investment Advisors segments. The increased operational costs are included in Compensation, benefits and other personnel, Consulting, outsourcing and professional fees, and Data processing and computer related expenses on the accompanying Consolidated Statements of Operations.

• Our operating expenses related to servicing new and existing clients of our hedge fund and separately managed accounts solutions of our Investment Managers segment increased during the year. These increased operational costs are also included in Compensation, benefits and other personnel, Consulting, outsourcing and professional fees, and Data processing and computer related expenses on the accompanying Consolidated Statements of Operations.

• We recognized $3.4 million in gains from structured investment vehicles (SIV) securities in 2011 as compared to $44.2 million in gains in 2010. Of the net gains recognized during 2011, gains of $10.6 million resulted from cash payments received from the SIV securities that had been previously written down offset by losses of $7.2 million which resulted from a decrease in fair value at December 31, 2011 (See Notes 5 and 6 to the Consolidated Financial Statements).

• Stock-based compensation costs declined in 2011 and reflect the return to normal levels of expense amortization as compared to the level in 2010. Stock-based compensation costs decreased during the year due to the acceleration of stock-based compensation in 2010 due to a change in management’s estimates of the attainment of certain performance vesting targets, net of the reversal of $6.2 million in stock-based compensation costs in the third quarter 2010.

• We continued our stock repurchase program during 2011 and purchased approximately 11,109,000 shares at an average price of $19.01 per share for a total cost of $211.2 million.

• We made principal payments of $95.0 million during 2011, including a final payment of $20.0 million in the fourth quarter, to fully repay the outstanding balance of our credit facility.

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• Our effective tax rate in 2011 declined to 35.2 percent from 37.0 percent in 2010. Our tax rate in 2011 was favorably impacted by tax planning strategies implemented during 2011.

Significant Items Impacting Our Financial Results in 2010

Revenues decreased $159.7 million, or 15 percent, to $900.8 million in 2010 compared to 2009. Net income attributable to SEI increased $57.4 million, or 33 percent, to $231.7 million and diluted earnings per share increased to $1.22 per share in 2010 compared to $0.91 per share in 2009. We believe the following items were significant to our business during 2010:

• Revenues in 2010 reflect the impact of deconsolidating LSV. Excluding the revenues from LSV in 2009, our revenues increased $52.2 million, or six percent, in 2010. This increase was primarily due to higher average asset balances under management and administration from improved capital markets. Our assets under management and administration, excluding LSV, increased $16.7 billion, or five percent, to $356.0 billion at December 31, 2010 from $339.2 billion at December 31, 2009.

• New business activity in our Institutional Investors and Investment Managers segments also contributed to increased revenues. New client asset funding, as well as asset funding from existing clients, for our retirement and not-for-profit solutions in our Institutional Investors segment and for our hedge fund solution in our Investment Managers segment positively impacted revenues during 2010.

• Our revenues from Transaction-based and trade execution fees fell $14.8 million, or 27 percent. This decline was a result of lower trading volumes in the capital markets. Our direct costs related to trade execution fees also declined, resulting in minimal impact to our earnings.

• Revenues from investment processing fees in our Private Banks segment were negatively affected by the loss of two large U.S. bank clients involved in mergers and acquisitions as well as lost clients and fee concessions for contract renewals with U.S. regional and community banks. An increase in recurring revenues from new U.K. clients partially offset the decline in revenues; however, profitability improvement from this new business was limited due to developmental and operational costs related to the support of the Global Wealth Platform, as well as increased personnel expenses such as stock-based compensation and sales compensation costs.

• Our percentage ownership of LSV remained at approximately 42 percent. Our proportionate share in the earnings of LSV in 2010 was $99.5 million, as compared to $75.4 million in 2009, an increase of 32 percent. LSV’s revenues significantly increased because of market appreciation in the value of assets under management from existing clients. LSV’s assets under management were $60.1 billion at December 31, 2010, as compared to $52.5 billion at December 31, 2009, an increase of 14 percent.

• We recognized $44.2 million in gains from structured investment vehicles (SIV) securities in 2010 as compared to $5.8 million in losses in 2009. Approximately $27.5 million of the gain in 2010 resulted from cash payments received from the SIV securities that had been previously written down. During 2010, we sold three of the SIV securities originally purchased from our money market funds in 2009. Realized gains from these sales were not significant.

• Stock-based compensation costs in 2010 increased $12.3 million to $26.8 million as compared to $14.5 million in 2009. This increase was primarily due to the accelerated recognition of stock-based compensation expense from a change in our estimate of the attainment of performance vesting targets made during the year.

• Compensation, benefits and other personnel costs increased $14.7 million in 2010 as compared to our costs in 2009 excluding LSV. This increase was due to increased salary and incentive compensation costs primarily from additions to our workforce.

• We continued to invest in the development of the Global Wealth Platform and its operational infrastructure. During 2010, we capitalized $38.7 million for significant enhancements and new functionality for the platform, as compared to $43.9 million in 2009. Amortization expense related to the Global Wealth Platform was $22.5 million in 2010.

• In 2010, we made principal payments of $138.0 million to reduce the outstanding balance of our credit facility. As of December 31, 2010, the outstanding balance of the credit facility was $95.0 million.

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• We continued our stock repurchase program during 2010 and purchased approximately 5,814,000 shares at an average price of approximately $20.81 per share for a total cost of $121.0 million.

• Our effective tax rate in 2010 rose to 37.0 percent as compared 33.9 percent in 2009. Our tax rate in 2009 was favorably impacted by the recognition of certain tax benefits related to the conclusion of federal and state income tax audits.

Forward Looking Information and Risk Factors

Certain information contained in this discussion is or may be considered forward-looking. Forward-looking statements relate to future operations, strategies, financial results or other developments. Forward-looking statements are based upon estimates and assumptions that involve certain risks and uncertainties, many of which are beyond our control or are subject to change. Although we believe our assumptions are reasonable, they could be inaccurate. Our actual future revenues and income could differ materially from our expected results. We have no obligation to publicly update or revise any forward-looking statements.

Among the risks and uncertainties which may affect our future operations, strategies, financial results or other developments are those risks described in Item 1A “Risk Factors” of this Annual Report. The following items are, in our opinion, anticipated to occur in the next 12 to 18 months:

• We will continue to invest in the Global Wealth Platform and its operational infrastructure because it is vital to our future growth strategy. Our current developmental and operational efforts are primarily focused on expanding the functionality of the platform for existing private bank and wealth managers in the United Kingdom as well as building the necessary functionality in order to service financial institutions and investment advisors in the United States. In 2011, we converted a small, select group of advisors onto the Global Wealth Platform. We expect to continue the rollout in 2012 and 2013. We are also investing in automation aimed at enhancing our operational efficiency and scale. A significant portion of the costs for these efforts will not be capitalized and; therefore, our operational costs related to the platform are expected to remain at current levels or increase, primarily impacting the operating margins of the Private Banks and Investment Advisors segments.

• We expect continued pressure on our operating margin for the Private Banks segment in 2012 by the extended lead time required to fully realize recurring revenues from new Global Wealth Services clients serviced on the Global Wealth Platform. About half of our new clients will transfer assets onto the platform over time rather than a complete conversion of an existing book of business as of a specific date. As stated earlier, we will continue our efforts to improve the operational efficiency and scale of the Global Wealth Services solution as we gain new clients; however, we do not expect profitability gains for the Private Banks segment in 2012.

• The majority of our revenues are based on the value of our assets under management and administration which are affected by changes in the capital markets. The sharp market volatility experienced during 2011 substantially offset our overall revenue growth gained from new business and increased business from our existing clients. If the instability of the capital market environment continues throughout 2012, our revenues and profits could be negatively impacted. Also, the current economic environment has slowed decision making in some of our target markets. We are actively engaged with new prospects in our target markets, but expect the current economic environment may make it difficult to generate substantial new client activity. If these economic conditions persist, we would expect extended sales cycles to continue throughout 2012, which could further impede revenue growth.

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Ending Asset Balances

This table presents ending asset balances of our clients, or of our clients’ customers, for which we provide management or administrative services through our subsidiaries and partnerships in which we have a significant interest. These assets are not included in our balance sheets because we do not own them.

Ending Asset Balances
(In millions)	As of December 31,
					Percent					Percent
	2011		2010		Change			2009		Change
Private Banks:
Equity and fixed-income programs	$	16,435	$	13,512		22	%	$	12,690		6	%
Collective trust fund programs		450		626		(28	%)		1,067		(41	%)
Liquidity funds		5,553		5,120		8	%		6,035		(15	%)
Total assets under management	$	22,438	$	19,258		17	%	$	19,792		(3	%)
Client proprietary assets under administration		10,355		10,672		(3	%)		11,213		(5	%)
Total assets	$	32,793	$	29,930		10	%	$	31,005		(3	%)
Investment Advisors:
Equity and fixed-income programs	$	26,639	$	27,680		(4	%)	$	25,392		9	%
Collective trust fund programs		1,298		1,820		(29	%)		2,423		(25	%)
Liquidity funds		2,505		1,641		53	%		1,929		(15	%)
Total assets under management	$	30,442	$	31,141		(2	%)	$	29,744		5	%
Institutional Investors:
Equity and fixed-income programs	$	49,051	$	48,699		1	%	$	44,322		10	%
Collective trust fund programs		492		623		(21	%)		684		(9	%)
Liquidity funds		3,888		3,382		15	%		3,370		0	%
Total assets under management	$	53,431	$	52,704		1	%	$	48,376		9	%
Investment Managers:
Equity and fixed-income programs	$	57	$	1		N/A		$	4		(75	%)
Collective trust fund programs		11,255		8,177		38	%		7,428		10	%
Liquidity funds		152		313		(51	%)		412		(24	%)
Total assets under management	$	11,464	$	8,491		35	%	$	7,844		8	%
Client proprietary assets under administration		221,198		233,079		(5	%)		221,680		5	%
Total assets	$	232,662	$	241,570		(4	%)	$	229,524		5	%
Investments in New Businesses:
Equity and fixed-income programs	$	515	$	569		(9	%)	$	520		9	%
Liquidity funds		37		65		(43	%)		75		(13	%)
Total assets under management	$	552	$	634		(13	%)	$	595		7	%
LSV:
Equity and fixed-income programs	$	53,712	$	60,058		(11	%)	$	52,488		14	%
Consolidated:
Equity and fixed-income programs	$	146,409	$	150,519		(3	%)	$	135,416		11	%
Collective trust fund programs		13,495		11,246		20	%		11,602		(3	%)
Liquidity funds		12,135		10,521		15	%		11,821		(11	%)
Total assets under management	$	172,039	$	172,286		0	%	$	158,839		8	%
Client proprietary assets under administration		231,553		243,751		(5	%)		232,893		5	%
Total assets under management and administration	$	403,592	$	416,037		(3	%)	$	391,732		6	%

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Average Asset Balances

This table presents average asset balances of our clients, or of our clients’ customers, for which we provide management or administrative services through our subsidiaries and partnerships in which we have a significant interest. These assets are not included in our balance sheets because we do not own them.

Average Asset Balances
(In millions)	For the Year Ended December 31,
					Percent					Percent
	2011		2010		Change			2009		Change
Private Banks:
Equity and fixed-income programs	$	15,891	$	12,579		26	%	$	11,115		13	%
Collective trust fund programs		526		772		(32	%)		1,145		(33	%)
Liquidity funds		5,145		5,247		(2	%)		7,809		(33	%)
Total assets under management	$	21,562	$	18,598		16	%	$	20,069		(7	%)
Client proprietary assets under administration		10,672		10,907		(2	%)		10,638		3	%
Total assets	$	32,234	$	29,505		9	%	$	30,707		(4	%)
Investment Advisors:
Equity and fixed-income programs	$	27,274	$	25,832		6	%	$	22,217		16	%
Collective trust fund programs		1,497		2,118		(29	%)		2,597		(18	%)
Liquidity funds		1,970		1,986		(1	%)		2,752		(28	%)
Total assets under management	$	30,741	$	29,936		3	%	$	27,566		9	%
Institutional Investors:
Equity and fixed-income programs	$	49,895	$	45,926		9	%	$	38,024		21	%
Collective trust fund programs		542		649		(16	%)		796		(18	%)
Liquidity funds		3,453		3,358		3	%		4,128		(19	%)
Total assets under management	$	53,890	$	49,933		8	%	$	42,948		16	%
Investment Managers:
Equity and fixed-income programs	$	39	$	2		N/A		$	4		(50	%)
Collective trust fund programs		9,978		7,687		30	%		7,081		9	%
Liquidity funds		199		467		(57	%)		722		(35	%)
Total assets under management	$	10,216	$	8,156		25	%	$	7,807		4	%
Client proprietary assets under administration		235,096		225,045		4	%		219,097		3	%
Total assets	$	245,312	$	233,201		5	%	$	226,904		3	%
Investments in New Businesses:
Equity and fixed-income programs	$	545	$	520		5	%	$	456		14	%
Liquidity funds		47		73		(36	%)		122		(40	%)
Total assets under management	$	592	$	593		0	%	$	578		3	%
LSV:
Equity and fixed-income programs	$	58,478	$	53,345		10	%	$	42,136		27	%
Consolidated:
Equity and fixed-income programs	$	152,122	$	138,204		10	%	$	113,952		21	%
Collective trust fund programs		12,543		11,226		12	%		11,619		(3	%)
Liquidity funds		10,814		11,131		(3	%)		15,533		(28	%)
Total assets under management	$	175,479	$	160,561		9	%	$	141,104		14	%
Client proprietary assets under administration		245,768		235,952		4	%		229,735		3	%
Total assets under management and administration	$	421,247	$	396,513		6	%	$	370,839		7	%

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In the preceding tables, assets under management are total assets of our clients or their customers invested in our equity and fixed-income investment programs, collective trust fund programs, and liquidity funds for which we provide asset management services. Assets under management and administration also include total assets of our clients or their customers for which we provide administrative services, including client proprietary fund balances for which we provide administration and/or distribution services.

Business Segments

Revenues, Expenses, and Operating Profit (Loss) for our business segments for the year ended 2011 compared to the year ended 2010, and for the year ended 2010 compared to the year ended 2009 are:

Year Ended December 31,	2011			2010			Percent Change			2009			Percent Change
Private Banks:
Revenues	$	348,122		$	346,668			0	%	$	361,273			(4	%)
Expenses		339,339			310,633			9	%		309,300			0	%
Operating Profit		8,783			36,035			(76	%)		51,973			(31	%)
Operating Margin		3	%		10	%					14	%
Investment Advisors:
Revenues		189,780			183,378			3	%		166,097			10	%
Expenses		110,438			110,388			0	%		109,418			1	%
Operating Profit		79,342			72,990			9	%		56,679			29	%
Operating Margin		42	%		40	%					34	%
Institutional Investors:
Revenues		210,027			206,531			2	%		177,721			16	%
Expenses		106,585			106,934			0	%		99,924			7	%
Operating Profit		103,442			99,597			4	%		77,797			28	%
Operating Margin		49	%		48	%					44	%
Investment Managers:
Revenues		177,975			160,159			11	%		139,004			15	%
Expenses		115,963			103,421			12	%		93,074			11	%
Operating Profit		62,012			56,738			9	%		45,930			24	%
Operating Margin		35	%		35	%					33	%
Investments in New Businesses:
Revenues		3,823			4,099			(7	%)		4,492			(9	%)
Expenses		11,559			12,676			(9	%)		11,625			9	%
Operating Loss		(7,736	)		(8,577	)		(10	%)		(7,133	)		20	%
Operating Margin		N/A			N/A						N/A

For additional information pertaining to our business segments, see Note 13 to the Consolidated Financial Statements.

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Private Banks

Year Ended December 31,	2011		2010		Percent Change			2009		Percent Change
Revenues:
Investment processing and software servicing fees	$	220,684	$	229,247		(4	%)	$	230,214		0	%
Asset management, administration & distribution fees		96,531		87,288		11	%		84,529		3	%
Transaction-based and trade execution fees		30,907		30,133		3	%		46,530		(35	%)
Total revenues	$	348,122	$	346,668		0	%	$	361,273		(4	%)

Revenues increased slightly in 2011 compared to the prior year. Revenues during 2011 were primarily affected by:

• Increased investment management fees from existing international clients due to higher average assets under management from improved capital markets in late 2010 into the first half of 2011, positive cash flows and favorable exchange rates; and

• Increased net investment processing fees from new Global Wealth Services clients implemented onto the Global Wealth Platform; partially offset by

• Lower recurring investment processing fees due to price reductions provided to existing clients that recontracted for longer periods, lower transaction volumes and client losses occurring in 2010; and

• Lower one-time project-related investment processing fees.

Revenues decreased $14.6 million, or four percent, in 2010 compared to the prior year. Revenues during 2010 were primarily affected by:

• Decreased trade execution fees due to lower trading volumes in the capital markets;

• Decreased investment processing fees for our Global Wealth Services solution; including non-recurring deconversion and contract buyout fees, due to the loss of two large U.S. bank clients involved in mergers and acquisitions;

• Lower investment processing fees from both lost clients and fee concessions for contract renewals with U.S. regional and community banks for our Global Wealth Services solution; and

• Lower fees from our liquidity products due to voluntary fee waivers; partially offset by

• Increased investment processing fees for our Global Wealth Services solution, including non-recurring project fees, because of new United Kingdom wealth advisory firms implemented onto the Global Wealth Platform; and

• Increased investment management fees from existing international clients due to higher average assets under management from improved capital markets.

Operating margins were three percent in 2011 and ten percent in 2010. Operating income decreased $27.3 million, or 76 percent, in 2011 compared to the prior year. Operating income in 2011 was primarily affected by:

• Increased non-capitalized development costs, mainly consulting fees, and amortization expense relating to the Global Wealth Platform;

• Increased operational costs, mainly personnel and data processing and computer-related expenses, for servicing new and existing Global Wealth Services clients implemented onto the Global Wealth Platform; and

• Increased direct expenses associated with increased investment management fees from existing international clients; partially offset by

• Decreased stock-based compensation costs due to the acceleration in 2010, net of the reversal of stock-based compensation costs in the third quarter 2010;

• Decreased one-time termination costs associated with a workforce reduction in first quarter 2010; and

• An increase in revenues.

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Operating margins were 10 percent in 2010 and 14 percent in 2009. Operating income decreased $15.9 million, or 31 percent, in 2010 compared to the prior year. Operating income in 2010 was primarily affected by:

• The decrease in revenues;

• Increased non-capitalized development costs as well as operating costs relating to the Global Wealth Platform;

• Increased direct expenses associated with increased investment management fees from existing international clients;

• An increase in stock-based compensation costs primarily due to the acceleration in recognition of stock-based compensation, net of the reversal of stock-based compensation costs, due to a change in management’s estimate of the attainment of certain performance vesting targets; and

• Increased sales compensation expenses due to sales of new business; partially offset by

• Decreased direct expenses associated with the decreased trade execution fees;

• Additional amortization expense of $10.1 million in 2009 related to the shortening in useful life of certain components related to the Global Wealth Platform; and

• Decreased one-time termination costs associated with the workforce reduction in first quarter 2009, net of one-time termination costs in first quarter 2010.

Investment Advisors

Revenues increased $6.4 million, or three percent, in 2011 compared to the prior year. Revenues during 2011 were primarily affected by:

• Increased investment management fees from existing clients due to higher average assets under management caused by improved capital markets during the latter half of 2010 and through the first half of 2011 and an increase in net cash flows in 2011 from new advisors.

Revenues increased $17.3 million, or ten percent, in 2010 compared to the prior year. Revenues during 2010 were primarily affected by:

• Increased investment management fees from existing clients due to higher average assets under management caused by improved capital markets; and

• An increase in the average basis points earned on assets due to client-directed shifts from liquidity products to our equity and fixed income programs.

Operating margins were 42 percent in 2011 and 40 percent in 2010. Operating income increased $6.4 million, or nine percent, in 2011 compared to the prior year. Operating income in 2011 was primarily affected by:

• An increase in revenues;

• Decreased stock-based compensation costs due to the acceleration in 2010, net of the reversal of stock-based compensation costs in the third quarter 2010; and

• A charge of approximately $1.0 million related to a processing error in third quarter 2010; partially offset by

• Increased non-capitalized development costs and amortization expense relating to the Global Wealth Platform as well as spending associated with building the necessary functionality and infrastructure for servicing financial institutions and investment advisors in the United States; and

• Increased compensation and other personnel expenses.

Operating margins were 40 percent in 2010 and 34 percent in 2009. Operating income increased $16.3 million, or 29 percent, in 2010 compared to the prior year. Operating income in 2010 was primarily affected by:

• An increase in revenues;

• Additional amortization expense of $3.7 million in 2009 related to the shortening in useful life of certain components related to the Global Wealth Platform; and

• Decreased one-time termination costs associated with the workforce reduction in first quarter 2009; partially offset by

• An increase in stock-based compensation costs primarily due to the acceleration in recognition of stock-based compensation, net of the reversal of stock-based compensation costs, due to a change in management’s estimate of the attainment of certain performance vesting targets; and

• A charge of approximately $1.0 million related to a processing error in the third quarter 2010.

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Institutional Investors

Revenues increased $3.5 million, or two percent, in 2011 compared to the prior year. Revenues during 2011 were primarily affected by:

• Increased investment management fees from existing clients due to higher average assets under management caused by improved capital markets during the latter half of 2010 and through the first half of 2011 as well as additional asset funding from existing clients; and

• Asset funding from new sales of our retirement and not-for-profit solutions; partially offset by client losses.

Revenues increased $28.8 million, or 16 percent, in 2010 compared to the prior year. Revenues during 2010 were primarily affected by:

• Increased investment management fees from existing clients due to higher average assets under management caused by improved capital markets as well as additional asset funding from existing clients; and

• Asset funding from new sales of our retirement and not-for-profit solutions; partially offset by client losses.

Operating margins were 49 percent in 2011 and 48 percent in 2010. Operating income increased $3.8 million, or four percent, in 2011 compared to the prior year. Operating income during 2011 was primarily affected by:

• An increase in revenues;

• Decreased stock-based compensation costs due to the acceleration in 2010, net of the reversal of stock-based compensation costs in the third quarter 2010; and

• Decreased discretionary marketing and promotion expenses; partially offset by

• Increased compensation and other personnel expenses; and

• Increased direct expenses associated with higher investment management fees.

Operating margins were 48 percent in 2010 and 44 percent in 2009. Operating income increased $21.8 million, or 28 percent, in 2010 compared to the prior year. Operating income during 2010 was primarily affected by:

• An increase in revenues; and

• A charge of approximately $2.2 million related to an operational error in the third quarter of 2009; partially offset by

• An increase in stock-based compensation costs primarily due to the acceleration in recognition of stock-based compensation, net of the reversal of stock-based compensation costs, due to a change in management’s estimate of the attainment of certain performance vesting targets;

• An increase in personnel expenses; and

• Increased direct expenses associated with higher investment management fees.

Investment Managers

Revenues increased $17.8 million, or 11 percent, in 2011 compared to the prior year. Revenues during 2011 were primarily affected by:

• Cash flows from new clients of our hedge funds and collective trust fund solutions;

• Net positive cash flows from existing hedge fund clients mainly due to higher valuations from capital market increases mostly during the first half of 2011; and

• Increased accounts from our separately managed account program due to new clients and existing clients involved in mergers; partially offset by client losses.

Revenues increased $21.2 million, or 15 percent, in 2010 compared to the prior year. Revenues during 2010 were primarily affected by:

• Cash flows from new clients, primarily hedge fund clients; and

• Net positive cash flows from existing hedge fund clients mainly due to higher valuations from capital market increases; partially offset by client losses.

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Operating margins were 35 percent in 2011 and 2010. Operating income increased $5.3 million, or nine percent, in 2011 compared to the prior year. Operating income during 2011 was primarily affected by:

• An increase in revenues; and

• Decreased stock-based compensation costs due to the acceleration in 2010, net of the reversal of stock-based compensation costs in the third quarter 2010; partially offset by

• Increased personnel expenses, technology and other operational costs to service new clients of our hedge fund and separately managed accounts solutions.

Operating margins were 35 percent in 2010 and 33 percent in 2009. Operating income increased $10.8 million, or 24 percent, in 2010 compared to the prior year. Operating income during 2010 was primarily affected by:

• An increase in revenues; partially offset by

• An increase in stock-based compensation costs primarily due to the acceleration in recognition of stock-based compensation, net of the reversal of stock-based compensation costs, due to a change in management’s estimate of the attainment of certain performance vesting targets;

• An increase in personnel expenses; and

• Increased technology and other investment spending for the development of new products and services.

Other

Other Income and Expense Items

Other income and expense items on the accompanying Consolidated Statements of Operations consist of:

Year Ended December 31,	2011			2010			2009
Net gain (loss) from investments	$	3,360		$	48,533		$	(4,926	)
Interest and dividend income		5,829			6,326			7,281
Interest expense		(585	)		(1,478	)		(3,744	)
Other expense, net		0			(590	)		0
Equity in earnings of unconsolidated affiliate		105,818			99,457			0
Total other income and expense items, net	$	114,422		$	152,258		$	(1,389	)

Net gain (loss) from investments

Net gain (loss) from investments consists of:

Year Ended December 31,	2011			2010		2009
Gains (losses) from SIV securities	$	3,390		$	44,247	$	(5,778	)
Net realized and unrealized (losses) gains from marketable securities		(25	)		1,214		1,753
Other-than-temporary declines in market value		0			0		(901	)
Other (losses) gains		(5	)		3,072		0
Net gain (loss) from investments	$	3,360		$	48,533	$	(4,926	)

We record our SIV securities at fair value and recognize unrealized gains and losses of the securities in current earnings. During 2011 and 2010, we recognized net gains from SIV securities of $3.4 million and $44.2 million, respectively. Of the net gains recognized during 2011, gains of $10.6 million resulted from cash payments received from the SIV securities offset by losses of $7.2 million which resulted from a decrease in fair value at December 31, 2011. During 2010, we recognized gains from SIV securities of $44.2 million, of which $27.5 million resulted from cash payments received from the SIV securities and $16.5 million was from a net increase in fair value at December 31, 2010. In addition, we recognized a net gain of $0.2 million from sales of three SIV securities during 2010. These gains and losses are included in Gains (losses) from SIV securities in the preceding table.

We recognized a $3.1 million gain in 2010 due to the sale of our ownership interest in a small company that was involved in a merger. This gain is reflected in Other gains (losses) in the preceding table.

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Interest and dividend income

Interest and dividend income is primarily based upon the amount of our cash balances and cash equivalents that are invested daily. The decreases in interest income in 2011 and 2010 compared to the prior years were due to declines in interest rates earned on our cash balances and lower yields earned from our cash equivalents.

Interest expense

Interest expense includes the interest charges and fees related to the borrowings under our credit facility. The decrease in interest expense in 2011 was due to the reduced level of outstanding debt from principal repayments. The decline in interest expense in 2010 was primarily due to the deconsolidation of LSV Employee Group since our interest expense in 2009 also included the interest charges related to their borrowings. We incurred interest expense of approximately $0.6 million, $1.4 million and $1.9 million in 2011, 2010 and 2009, respectively, related to our borrowings under the credit facility. Interest expense for the debt associated with LSV Employee Group included in our interest expense in 2009 was approximately $1.5 million.

Equity in earnings of unconsolidated affiliate

Equity in earnings of unconsolidated affiliate includes our less than 50 percent ownership in LSV. Our total partnership interest in LSV was approximately 41 percent during 2011 and was approximately 42 percent during 2010 and 2009. Our proportionate share in the earnings of LSV was $105.8 million and $99.5 million in 2011 and 2010, respectively. The increase in 2011 was primarily due to increased assets under management by LSV from existing clients because of the general improvement in capital markets and increased performance fees. We deconsolidated the accounts and operations of LSV in January 2010. In 2009, LSV was a business segment and, therefore, our proportionate share in the earnings of LSV was included in the results of our business segments. On a proforma basis, if our investment in LSV had been recorded under the equity method in 2009, our proportionate share in the earnings of LSV would have increased by $24.1 million to $99.5 million in 2010 from $75.4 million in 2009, an increase of 32 percent. This increase on a proforma basis was due to higher assets under management from existing clients from market appreciation.

Noncontrolling interest

Noncontrolling interest includes the interest of other shareholders in a joint venture of the Company in an asset management firm located in South Korea. Noncontrolling interest in 2009 primarily includes the amount owned by other partners of LSV and LSV Employee Group.

Income Taxes

Our effective tax rate was 35.2 percent in 2011, 37.0 percent in 2010, and 33.9 percent in 2009. Our tax rate in 2011 was favorably impacted by determination that SEI was eligible for the Domestic Production Activities Deduction. The effective rate for 2011 reflects the benefit of this deduction for 2007 through 2011. Excluding the benefit for the Domestic Production Activities Deduction, our effective tax rate would be 37.4 percent. The 2009 effective tax rate is lower than 2010 due to the recognition of certain tax benefits related to the conclusion of federal and state income tax audits. Our effective tax rate for 2009, excluding the net reduction relating to tax uncertainties, was 37.0 percent. We expect our effective tax rate to be between 36.0 and 37.0 percent in 2012 with the assumption that we are able to utilize the research and development tax credit.

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Stock-Based Compensation

During 2011 and 2010, we recognized approximately $14.1 million and $26.8 million, respectively, in stock-based compensation expense, a decrease of $12.7 million. This decrease consisted of the following components:

	Change in Stock-Based Compensation Expense
Stock-based compensation cost recognized in 2011 for grants made in December 2010	$	4,752
Reversal of previously recognized stock-based compensation expense in third quarter 2010		6,161
Stock-based compensation cost associated with options that vested in 2010		(22,892	)
Other items		(691	)
	$	(12,670	)

Based upon our current view of how many options will vest and when they will vest, we estimate that stock-based compensation expense will be recognized according to the following schedule:

Period	Stock-Based Compensation Expense
2012	$	14,398
2013		12,704
2014		12,510
2015		3,846
2016		2,355
2017		2,310
	$	48,123

Fair Value Measurements

The fair value of our financial assets is determined in accordance with the fair value hierarchy. The fair value of most of our financial assets is determined using Level 1 or Level 2 inputs and consist mainly of investments in equity and fixed-income mutual funds that are quoted daily and Government National Mortgage Association and other U.S. government agency securities that are single issuer pools that are valued based on current market data of similar assets. Level 3 financial assets primarily consist of SIV securities. We did not have any financial liabilities at December 31, 2011 or 2010. See Note 5 to the Consolidated Financial Statements for more information pertaining to the valuation of SIV securities.

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Liquidity and Capital Resources

Year Ended December 31,	2011			2010			2009
Net cash provided by operating activities	$	256,962		$	229,326		$	345,471
Net cash used in investing activities		(31,950	)		(41,475	)		(338,912	)
Net cash (used in) provided by financing activities		(300,318	)		(282,436	)		167,675
Net (decrease) increase in cash and cash equivalents		(75,306	)		(94,585	)		174,234
Cash and cash equivalents, beginning of year		496,292			590,877			416,643
Cash and cash equivalents, end of year	$	420,986		$	496,292		$	590,877

Cash requirements and liquidity needs are primarily funded through our cash flow from operations and our capacity for additional borrowing. We borrowed $254.0 million through our five-year, $300.0 million credit facility with JPMorgan Chase Bank, N.A. in 2009 to purchase SIV securities from our money market funds. In 2009, 2010 and 2011, we made principal payments of $21.0 million, $138.0 million and $95.0 million, respectively, to fully repay the balance of the credit facility (See Note 7 to the Consolidated Financial Statements). At December 31, 2011, our unused sources of liquidity consisted of cash and cash equivalents and the full amount available under the existing credit facility which was scheduled to expire in July 2012.

In February 2012, we replaced our credit facility with a new five-year credit facility agreement which provides for borrowings of up to $300.0 million. The new credit facility is a senior unsecured revolving line of credit with Wells Fargo Bank, National Association, and a syndicate of other lenders and is scheduled to expire in February 2017. The availability of the new credit facility is subject to the compliance with certain covenants set forth in the agreement. The credit facility contains covenants which restrict our ability to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. In the event of a default under the credit facility, we would also be restricted from paying dividends on, or repurchasing, our common stock. Currently, our ability to borrow from the credit facility is not limited by any covenant of the agreement. We currently have no borrowings under the new credit facility.

Our cash and cash equivalents include accounts managed by our subsidiaries and minority-owned subsidiaries that are used in their operations or to cover specific business and regulatory requirements. The availability of this cash for other purposes beyond the operations of these subsidiaries may be limited. As of January 31, 2012, the amount of cash and cash equivalents considered free and immediately accessible for other general corporate purposes was $226.0 million.

Cash flows from operations increased $27.6 million in 2011 compared to 2010 due to the partnership distribution payments received from LSV, non-cash adjustments for net realized gains from marketable securities in 2011 as opposed to 2010, and the net change in our working capital accounts.

Cash flows from investing activities increased $9.5 million in 2011 compared to 2010 primarily due to the net reduction of $37.1 million in our cash and cash equivalents during the first quarter of 2010 from the deconsolidation of the accounts of LSV. Net cash used in investing activities also includes:

• Purchases, sales and maturities of marketable securities. We had cash outflows of $74.0 million for the purchase of marketable securities in 2011 as compared to $39.1 million in 2010. Marketable securities purchased in 2011 consisted of investments in U.S. government agency and commercial paper securities with maturity dates less than one year by SIDCO, additional GNMA securities to satisfy applicable regulatory requirements of SPTC and investments for the start-up of new investment products. Marketable securities purchased in 2010 consisted of investments for the start-up of new investment products and GNMA securities for SPTC regulatory requirements. We had cash inflows of $99.8 million from sales and maturities of marketable securities, including principal prepayments received from our GNMA and SIV securities, in 2011 as compared to $87.0 million in 2010. Marketable securities sold in 2011 and 2010 primarily include the proceeds from the sales of SIV securities.

• The capitalization of costs incurred in developing computer software. We will continue the development of the Global Wealth Platform through a series of releases to expand the functionality of the platform. We capitalized $41.0 million of software development costs in 2011 as compared to $38.7 million in 2010. Amounts capitalized in 2011 and 2010 include costs for significant enhancements and upgrades to the platform.

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• Capital expenditures. Our capital expenditures in 2011 and 2010 primarily include equipment for our data center operations.

Cash flows from financing activities decreased $17.9 million in 2011 compared to 2010. Net cash used in financing activities includes:

• The repurchase of our common stock. Our Board of Directors has authorized the repurchase of up to $1.928 billion worth of our common stock through multiple authorizations. As of January 31, 2012, we had approximately $95.8 million of authorization remaining for the purchase of our common stock under this program. Currently, there is no expiration date for our common stock repurchase program. The following table lists information regarding repurchases of our common stock during 2011, 2010, and 2009:

Year	Total Number of Shares  Repurchased		Average Price Paid per Share		Total Cost (in thousands)
2011		11,109,000	$	19.01	$	211,165
2010		5,814,000		20.81		120,982
2009		3,198,000		16.92		54,114

• Principal payments of our debt. Principal payments in 2011 and 2010 include payments of $95.0 million and $138.0 million, respectively, to reduce the outstanding debt associated with our credit facility. We fully repaid our existing credit facility with the final payment of $20.0 million made in December 2011.

• Dividend payments. Cash dividends paid were $22.0 million or $.12 per share in 2011, $54.6 million or $.29 per share in 2010 and $30.6 million or $.16 per share in 2009. Our Board of Directors declared a cash dividend of $.15 per share on December 13, 2011. The dividend was paid on January 6, 2012 for $26.5 million. The decrease in dividends paid in 2011 was due to the payment date of the dividend declared in December 2010 occurring in the calendar year as compared to the payment date of the dividend declared in December 2011 which occurred in January of 2012.

We believe our operating cash flow, available borrowing capacity, and existing cash and cash equivalents should provide adequate funds for ongoing operations; continued investment in new products and equipment; our common stock repurchase program and future dividend payments.

Significant Arrangement

On January 24, 2006, we entered into a Guaranty and Collateral Agreement with LSV Employee Group, Bank of America, N.A. and certain other lenders. We entered into the agreement in order to facilitate the acquisition of certain partnership interests of LSV by LSV Employee Group. Additional information pertaining to the agreement is presented in Note 2 to the Consolidated Financial Statements.

Contractual Obligations and Contingent Obligations

As of December 31, 2011, the Company is obligated to make payments in connection with its lines of credit, operating leases, maintenance contracts and other commitments in the amounts listed below. The Company has no unrecorded obligations other than the items noted in the following table:

	Total		2012		2013		2014 to 2015		2016 and Thereafter
Line of credit (a)	$	2,323	$	457	$	457	$	914	$	495
Operating leases and maintenance agreements (b)		50,790		17,892		13,527		8,952		10,419
Other commitments (c)		1,768		1,768		0		0		0
Total	$	54,881	$	20,117	$	13,984	$	9,866	$	10,914

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(a) Amounts include estimated commitment fees for our credit facility. We had no debt outstanding at December 31, 2011. See Note 7 to the Consolidated Financial Statements.

(b) See Note 11 to the Consolidated Financial Statements.

(c) Amount includes the portion of uncertain tax liabilities classified as a current liability. The actual cash payment associated with these commitments may differ. See Note 12 to the Consolidated Financial Statements.

Critical Accounting Policies

The accompanying consolidated financial statements and supplementary information were prepared in accordance with accounting principles generally accepted in the United States. Our significant accounting policies are discussed in Note 1 to the Consolidated Financial Statements. Inherent in the application of many of these accounting policies is the need for management to make estimates and judgments in the determination of certain revenues, expenses, assets and liabilities. Materially different financial results can occur as circumstances change and additional information becomes known. We believe that the following accounting policies require extensive judgment by our management to determine the recognition and timing of amounts recorded in our financial statements.

Revenue Recognition:

Revenues are recognized in the periods in which the related services are performed provided that persuasive evidence of an agreement exists, the fee is fixed or determinable, and collectibility is reasonably assured. Cash received by us in advance of the performance of services is deferred and recognized as revenue when earned. Our principal sources of revenues are: (1) asset management, administration and distribution fees calculated as a percentage of the total average daily net assets under management or administration; (2) information processing and software servicing fees that are recurring in nature and earned based upon the number of trust accounts being serviced and non-recurring project fees that are earned based upon contractual agreements related to client implementations; and (3) transaction-based fees for providing trade-execution services. The majority of our revenues are based on contractual arrangements. Certain portions of our revenues require management’s consideration of the nature of the client relationship in determining whether to recognize as revenue the gross amount billed or net amount retained after payments are made to vendors for certain services related to the product or service offering.

Fair Value of Financial Assets and Liabilities:

We determine the fair value of our financial assets and liabilities in accordance with the fair value hierarchy. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting standard also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The fair value hierarchy describes three levels of inputs that may be used to measure fair value:

Level 1 – Quoted prices in active markets for identical assets and liabilities without adjustment;

Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data; and

Level 3 – Unobservable inputs that are supported by little or no market activity and are significant to the fair value of those assets or liabilities.

The use of Level 3 inputs to determine the fair value of our financial assets requires considerable judgment by management. Our Level 3 financial assets primarily consist of SIV securities we own. We did not have any financial liabilities at December 31, 2011 or 2010 (See Fair Value Measurements section earlier in this discussion).

We review our investments in marketable securities on a quarterly basis with regard to impairment. Some of the factors considered in determining other-than-temporary impairment for our equity securities include, but are not limited to, significant or prolonged declines in the fair value of our investments, our ability and intent to retain the investment for a period sufficient to allow the value to recover, and the financial condition of the investment. Some of the factors considered in determining other-than-temporary impairment for our debt securities include, but are not limited to, our intent to sell the security, the likelihood that we will be required to

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sell the security before recovering its cost, and our expectation to recover the entire amortized cost basis of the security even if we do not intend to sell the security. After considering these factors, if we believe that a decline is other-than-temporary, the carrying value of the investment is written down to its fair value through current period earnings.

Computer Software Development Costs:

We utilize internally developed computer software as part of our product offering. In the development of a new software product, substantial consideration must be given by management to determine whether costs incurred are research and development costs, or internal software development costs eligible for capitalization. Management must consider a number of different factors during their evaluation of each computer software development project that includes estimates and assumptions. Costs considered to be research and development are expensed as incurred. After meeting specific requirements, internal software development costs are capitalized as incurred. The capitalization and ongoing assessment of recoverability of software development costs requires considerable judgment by management with respect to certain external factors, including, but not limited to, technological and economic feasibility, and estimated economic life. Amortization of capitalized software development costs begins when the product is ready for its intended use. Capitalized software development costs are amortized on a product-by-product basis using the straight-line method over the estimated economic life of the product or enhancement.

We evaluate the carrying value of our capitalized software when circumstances indicate the carrying value may not be recoverable. The review of capitalized software for impairment requires significant assumptions about operating strategies, underlying technologies utilized, and external market factors. Our capitalized software was developed using mainstream technologies that are industry standards and are based on technology developed by multiple vendors that are significant industry leaders. External market factors include, but are not limited to, expected levels of competition, barriers to entry by potential competitors, stability in the target market and governmental regulations. In 2011, we determined that no events or change in circumstances had occurred that would indicate that our capitalized software development costs were impaired (See Note 1 to the Consolidated Financial Statements).

Income Tax Accounting:

We use the asset and liability method of accounting for income taxes. Under this method, income tax expense is recognized for the amount of taxes payable or refundable for the current year. In addition, deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities, and for operating losses and tax credit carryforwards. Management must make assumptions, judgments and estimates to determine our current provision for income taxes and also our deferred tax assets and liabilities and any valuation allowance to be recorded against a deferred tax asset.

Our assumptions, judgments and estimates relative to the current provision for income taxes take into account current tax laws, our interpretation of current tax laws and possible outcomes of current and future audits conducted by foreign and domestic tax authorities. We have established reserves for income taxes to address potential exposures involving tax positions that could be challenged by tax authorities. Although we believe our assumptions, judgments and estimates are reasonable, changes in tax laws or our interpretation of tax laws and the resolution of any future tax audits could significantly impact the amounts provided for income taxes in our consolidated financial statements.

Our assumptions, judgments and estimates relative to the value of a deferred tax asset take into account predictions of the amount and category of future taxable income, such as income from operations or capital gains income. Actual operating results and the underlying amount and category of income in future years could render our current assumptions, judgments and estimates of recoverable net deferred taxes inaccurate. Any of the assumptions, judgments and estimates mentioned above could cause our actual income tax obligations to differ from our estimates, thus materially impacting our financial position and results of operations.

Stock-Based Compensation:

Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which is the vesting period. We currently use the Black-Scholes option pricing model to determine the fair value of stock options. The determination of the fair value of stock-based payment awards on the date of grant using an option-pricing model is affected by our stock price as well as various other assumptions. These assumptions include our expected stock price volatility over the term of the awards, actual and projected employee stock option exercise behaviors, risk-free interest rate and expected dividends. We are required to estimate forfeitures at the time of grant and revise those estimates

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in subsequent periods if actual forfeitures differ from those estimates. The amount of stock-based compensation expense that is recognized in a given period is dependent upon management’s estimate of when the earnings per share targets are expected to be achieved. If this estimate proves to be inaccurate, the remaining amount of stock-based compensation expense could be accelerated, spread out over a longer period, or reversed. We currently base our expectations for these assumptions from historical data and other applicable factors. These expectations are subject to change in future periods.

The assessment of critical accounting policies is not meant to be an all-inclusive discussion of the uncertainties to financial results that can occur from the application of the full range of our accounting policies. Materially different financial results could occur in the application of other accounting policies as well. Also, materially different results can occur upon the adoption of new accounting standards.

New Accounting Pronouncements

In May 2011, the Financial Accounting Standards Board (FASB) issued a final Accounting Standards Update which represents the converged guidance of the FASB and the International Accounting Standards Board on fair value measurement. The guidance clarifies how a principal market is determined, addresses the fair value measurement of instruments with offsetting market or counterparty credit risks, addresses the concept of valuation premise and highest and best use, extends the prohibition on blockage factors to all three levels of the fair value hierarchy and requires additional disclosures. The guidance is effective for interim and annual periods beginning after December 15, 2011 and is applied prospectively. We do not expect the adoption of the guidance to have a significant impact on our consolidated financial statements.

In June 2011, the FASB issued a final Accounting Standards Update to amend the presentation of comprehensive income in financial statements. This new guidance allows companies the option to present other comprehensive income in either a single continuous statement or in two separate but consecutive statements. Under both alternatives, companies will be required to present each component of net income and comprehensive income. The guidance is effective for interim and annual periods beginning after December 15, 2011 and is applied retrospectively. We do not expect the adoption of the guidance to have any impact on our consolidated financial statements.

See the discussion of New Accounting Pronouncements in Note 1 to the Consolidated Financial Statements.

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Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

None.

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Item 8. Financial Statements and Supplementary Data.

	Page
Index to Financial Statements:
Report of Independent Registered Public Accounting Firm		37
Consolidated Balance Sheets — December 31, 2011 and 2010		38
Consolidated Statements of Operations — For the years ended December 31, 2011, 2010, and 2009		40
Consolidated Statements of Comprehensive Income — For the years ended December  31, 2011, 2010, and 2009		41
Consolidated Statements of Changes in Equity — For the years ended December  31, 2011, 2010, and 2009		42
Consolidated Statements of Cash Flows — For the years ended December 31, 2011, 2010, and 2009		43
Notes to Consolidated Financial Statements		45
Schedule II — Valuation and Qualifying Accounts and Reserves - For the years ended December  31, 2011, 2010, and 2009		79

All other schedules are omitted because they are not applicable, or not required, or because the required information is included in the Consolidated Financial Statements or notes thereto.

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Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders

of SEI Investments Company:

In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material respects, the financial position of SEI Investments Company and its subsidiaries (“the Company”) at December 31, 2011 and 2010, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2011 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the accompanying index presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2011, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements and financial statement schedule, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control over Financial Reporting under Item 9A. Our responsibility is to express opinions on these financial statements, on the financial statement schedule, and on the Company’s internal control over financial reporting based on our integrated 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 audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 27, 2012

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	Consolidated Balance Sheets (In thousands)		SEI Investments Company and Subsidiaries
	December 31,	2011		2010
Assets	Current Assets:
	Cash and cash equivalents	$	420,986	$	496,292
	Restricted cash		6,000		4,000
	Receivables from regulated investment companies		25,800		29,282
	Receivables, net of allowance for doubtful accounts of $924 and $1,195 (Note 4)		142,109		136,490
	Deferred income taxes, net		1,150		1,387
	Securities owned		20,949		0
	Other current assets		17,957		16,268
	Total Current Assets		634,951		683,719
	Property and Equipment, net of accumulated depreciation of $182,453 and $166,816 (Note 4)		129,548		140,568
	Capitalized Software, net of accumulated amortization of $117,100 and $90,947		309,133		294,332
	Investments Available for Sale (Note 6)		83,008		74,770
	Trading Securities (Note 6)		56,325		104,594
	Investment in Unconsolidated Affiliate (Note 2)		60,954		64,409
	Other Assets, net		20,640		14,831
	Total Assets	$	1,294,559	$	1,377,223

The accompanying notes are an integral part of these financial statements.

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	Consolidated Balance Sheets (In thousands, except par value)		SEI Investments Company and Subsidiaries
	December 31,	2011		2010
Liabilities and Shareholders’ Equity	Current Liabilities:
	Accounts payable	$	1,999	$	4,582
	Accrued liabilities (Note 4)		147,044		121,410
	Deferred revenue		2,030		1,608
	Total Current Liabilities		151,073		127,600
	Long-term Debt (Note 7)		0		95,000
	Deferred Income Taxes		93,751		92,253
	Other Long-term Liabilities (Note 12)		8,276		5,645
	Total Liabilities		253,100		320,498
	Commitments and Contingencies (Note 11)
	Equity:
	SEI Investments shareholders’ equity:
	Series Preferred stock, $.05 par value, 50 shares authorized; no shares issued and outstanding		0		0
	Common stock, $.01 par value, 750,000 shares authorized; 176,506 and 186,141 shares issued and outstanding		1,765		1,861
	Capital in excess of par value		577,949		565,393
	Retained earnings		443,702		471,159
	Accumulated other comprehensive income, net		1,900		3,157
	Total SEI Investments Shareholders’ Equity		1,025,316		1,041,570
	Noncontrolling interest		16,143		15,155
	Total Equity		1,041,459		1,056,725
	Total Liabilities and Equity	$	1,294,559	$	1,377,223

The accompanying notes are an integral part of these financial statements.

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Consolidated Statements of Operations	SEI Investments Company
(In thousands, except per-share data)	and Subsidiaries

Year Ended December 31,	2011			2010			2009
Revenues:
Asset management, administration and distribution fees	$	669,788		$	628,535		$	773,186
Information processing and software servicing fees		222,417			231,529			231,807
Transaction-based and trade execution fees		37,522			40,771			55,555
Total revenues		929,727			900,835			1,060,548
Expenses:
Subadvisory, distribution and other asset management costs		103,134			101,722			94,449
Software royalties and other information processing costs		27,437			24,419			21,509
Brokerage commissions		27,022			28,882			41,146
Compensation, benefits and other personnel		289,445			269,165			274,675
Stock-based compensation		14,112			26,783			14,503
Consulting, outsourcing and professional fees		113,171			89,033			81,694
Data processing and computer related		47,003			41,064			45,403
Facilities, supplies and other costs		55,579			56,284			57,323
Amortization		27,288			24,048			44,608
Depreciation		21,471			21,902			21,531
Total expenses		725,662			683,302			696,841
Income from operations		204,065			217,533			363,707
Net gain (loss) from investments		3,360			48,533			(4,926	)
Interest and dividend income		5,829			6,326			7,281
Interest expense		(585	)		(1,478	)		(3,744	)
Other expense, net		0			(590	)		0
Equity in earnings of unconsolidated affiliate		105,818			99,457			0
Net income before income taxes		318,487			369,781			362,318
Income taxes		111,837			136,461			89,886
Net income	$	206,650		$	233,320		$	272,432
Less: Net income attributable to the noncontrolling interest		(1,691	)		(1,633	)		(98,097	)
Net income attributable to SEI Investments Company	$	204,959		$	231,687		$	174,335
Basic earnings per common share	$	1.12		$	1.23		$	0.91
Diluted earnings per common share	$	1.11		$	1.22		$	0.91

The accompanying notes are an integral part of these financial statements.

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Consolidated Statements of Comprehensive Income	SEI Investments Company
(In thousands)	and Subsidiaries

Year Ended December 31,	2011			2010			2009
Net income	$	206,650		$	233,320		$	272,432
Other comprehensive (loss) gain, net of tax:
Foreign currency translation adjustments		(3,195	)		2,205			8,734
Unrealized holding gain on investments:
Unrealized holding gains during the period, net of income taxes of $(811), $(486) and $(1,065)		1,369			484			2,124
Less: reclassification adjustment for (gains) losses realized in net income, net of income taxes of $77, $56 and $(222)		(134	)		(105	)		360
Total other comprehensive (loss) gain, net of taxes		(1,960	)		2,584			11,218
Comprehensive income		204,690			235,904			283,650
Less: Comprehensive income attributable to noncontrolling interest		(988	)		(2,318	)		(99,894	)
Comprehensive income attributable to SEI Investments	$	203,702		$	233,586		$	183,756

The accompanying notes are an integral part of these financial statements.

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Consolidated Statements of Changes in Equity	SEI Investments Company
(In thousands)	and Subsidiaries

Year Ended December 31,	2011			2010			2009
Shares of Common Stock
Beginning balance		186,141			190,208			191,195
Purchase and retirement of common stock		(11,109	)		(5,814	)		(3,198	)
Issuance of common stock under the employee stock purchase plan		110			114			156
Issuance of common stock upon exercise of stock options		1,364			1,633			2,055
Ending balance		176,506			186,141			190,208
Common Stock
Beginning balance	$	1,861		$	1,902		$	1,912
Purchase and retirement of common stock		(111	)		(58	)		(32	)
Issuance of common stock under the employee stock purchase plan		1			1			2
Issuance of common stock upon exercise of stock options		14			16			20
Ending balance	$	1,765		$	1,861		$	1,902
Capital In Excess of Par Value
Beginning balance	$	565,393		$	522,080		$	485,721
Purchase and retirement of common stock		(27,196	)		(13,426	)		(6,970	)
Issuance of common stock under the employee stock purchase plan		1,892			1,902			2,035
Issuance of common stock upon exercise of stock options		22,314			26,177			21,607
Stock-based compensation		14,112			26,783			13,962
Tax benefit on stock options exercised		1,434			1,877			5,725
Ending balance	$	577,949		$	565,393		$	522,080
Retained Earnings
Beginning balance	$	471,159		$	384,483		$	289,682
Net income attributable to SEI Investments Company		204,959			231,687			174,335
Purchase and retirement of common stock		(183,858	)		(107,498	)		(47,112	)
Dividends declared		(48,558	)		(37,513	)		(32,422	)
Ending balance	$	443,702		$	471,159		$	384,483
Accumulated Other Comprehensive (Loss) Income
Beginning balance	$	3,157		$	1,258		$	(8,163	)
Other comprehensive (loss) income		(1,257	)		1,899			9,421
Ending balance	$	1,900		$	3,157		$	1,258
Total SEI Investments Shareholders’ Equity	$	1,025,316		$	1,041,570		$	909,723
Noncontrolling interest	$	16,143		$	15,155		$	121,895
Total Equity	$	1,041,459		$	1,056,725		$	1,031,618

The accompanying notes are an integral part of these financial statements.

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Consolidated Statements of Cash Flows	SEI Investments Company
(In thousands)	and Subsidiaries

Year Ended December 31,	2011			2010			2009
Cash flows from operating activities:
Net income	$	206,650		$	233,320		$	272,432
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization		27,288			24,048			44,608
Depreciation		21,471			21,902			21,531
Equity in earnings of unconsolidated affiliate		(105,818	)		(99,457	)		0
Cash received from unconsolidated affiliate		109,273			72,060			0
Payments to partners of LSV		0			0			(87,337	)
Stock-based compensation		14,112			26,783			14,503
Provision for losses on receivables		(271	)		(1,004	)		692
Deferred income tax expense		1,001			6,461			67,265
Net realized (gains) losses from investments		(3,360	)		(48,533	)		178,007
Other-than-temporary declines in market value		0			0			901
Change in other long-term liabilities		2,631			(81	)		1,659
Other		(2,833	)		2,473			3,508
Change in current assets and liabilities:
Decrease (increase) in:
Restricted cash for broker-dealer operations		0			16,000			0
Receivables from regulated investment companies		3,482			(1,148	)		230
Receivables		(11,474	)		(11,032	)		(3,885	)
Other current assets		(1,689	)		(1,101	)		197
Increase (decrease) in:
Accounts payable		(2,583	)		1,734			(9,457	)
Capital Support Agreements		0			0			(173,983	)
Payable to regulated investment companies		0			0			(97	)
Accrued liabilities		(1,340	)		(13,847	)		15,367
Deferred revenue		422			748			(670	)
Total adjustments		50,312			(3,994	)		73,039
Net cash provided by operating activities	$	256,962		$	229,326		$	345,471

The accompanying notes are an integral part of these financial statements.

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Consolidated Statements of Cash Flows	SEI Investments Company
(In thousands)	and Subsidiaries

Year Ended December 31,	2011			2010			2009
Cash flows from investing activities:
Additions to restricted cash		(2,000	)		0			(6,000	)
Additions to property and equipment		(12,271	)		(13,611	)		(19,272	)
Additions to capitalized software		(40,954	)		(38,729	)		(43,944	)
Purchases of marketable securities		(73,960	)		(39,085	)		(322,528	)
Prepayments and maturities of marketable securities		61,582			58,174			32,002
Sales of marketable securities		38,247			28,859			20,830
Purchases of other investments		(7,500	)		0			0
Sales of other investments		4,906			0			0
LSV and LSV Employee Group cash balances, net (A)		0			(37,083	)		0
Net cash used in investing activities		(31,950	)		(41,475	)		(338,912	)
Cash flows from financing activities:
Proceeds from borrowings on long-term debt		0			0			254,000
Payments on long-term debt		(95,000	)		(138,000	)		(31,980	)
Purchase and retirement of common stock		(208,932	)		(119,775	)		(53,136	)
Proceeds from issuance of common stock		24,221			28,096			23,664
Tax benefit on stock options exercised		1,434			1,877			5,725
Payment of dividends		(22,041	)		(54,634	)		(30,598	)
Net cash (used in) provided by financing activities		(300,318	)		(282,436	)		167,675
Net (decrease) increase in cash and cash equivalents		(75,306	)		(94,585	)		174,234
Cash and cash equivalents, beginning of year		496,292			590,877			416,643
Cash and cash equivalents, end of year	$	420,986		$	496,292		$	590,877
Interest paid	$	559		$	1,488		$	4,676
Income taxes paid	$	116,483		$	145,553		$	9,052
Non-cash financing activities
Dividends declared but not paid	$	26,518		$	0		$	17,121

(A) Cash balances, net of the partnership distribution payment received in January 2010, of LSV and LSV Employee Group at December 31, 2009 removed due to the deconsolidation of the accounts and operations of LSV and LSV Employee Group in January 2010 (See Note 2).

The accompanying notes are an integral part of these financial statements.

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Notes to Consolidated Financial Statements	SEI Investments Company
(all figures are in thousands except per-share data)	and Subsidiaries

Note 1 – Summary of Significant Accounting Policies:

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations solutions to corporations, financial institutions, financial advisors, and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe, and other various locations throughout the world. Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing solutions are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, except for fees earned associated with trade execution services.

Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations solutions offer investment managers support for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. These solutions also provide support to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas. Revenues from investment operations solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Principles of Consolidation

The Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries and entities in which it holds a controlling financial interest. The Company determines whether it has a controlling financial interest either by its decision-making ability through voting interests or by the extent of the Company’s participation in the economic risks and rewards of the entity through variable interests. The Company accounts for noncontrolling interests in consolidated entities for which the Company’s controlling financial interest is less than 100 percent. The Company’s principal subsidiaries are SEI Investments Distribution Co. (SIDCO), SEI Investments Management Corporation (SIMC), SEI Private Trust Company (SPTC), SEI Trust Company (STC), SEI Global Services, Inc. (SGSI) and SEI Investments (Europe) Limited (SIEL). All intercompany accounts and transactions have been eliminated.

In January 2010, new accounting guidance pertaining to the consolidation of VIEs became effective. Under the new guidance, the Company was not considered the primary beneficiary of LSV Employee Group (See Note 2). The Company, therefore, discontinued consolidating the accounts and operations of LSV Asset Management (LSV) and LSV Employee Group in its financial statements. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheet and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statement of Operations. The deconsolidation of LSV had no effect on Net income attributable to SEI. Prior period financial statements are not reclassified for the new accounting guidance.

Noncontrolling interest on the accompanying Consolidated Balance Sheets includes the interest of other shareholders in a joint venture of the Company in an asset management firm located in South Korea.

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Variable Interest Entities

The Company has involvement with various variable interest entities (VIE or VIEs). These VIEs consist of LSV Employee Group and investment products established for clients created in the form of various types of legal entity structures. In June 2009, the Financial Accounting Standards Board (FASB) issued guidance related to the consolidation of VIEs. This guidance changed how a company determines when an entity that is insufficiently capitalized or is not controlled through voting common stock should be consolidated. The determination of whether a company is required to consolidate an entity is based on, among other things, an entity’s purpose and design, a company’s ability to direct the activities of the entity that most significantly impact the entity’s economic performance, and whether a company is obligated to absorb losses or receive benefits that could be potentially significant to the entity. The guidance requires ongoing reassessments of whether an enterprise is the primary beneficiary of a VIE and requires disclosures about an enterprises involvement in VIEs.

Under the new guidance, LSV Employee Group remains a VIE. However, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group either directly or through any financial responsibility from the Guaranty Agreement. As of January 1, 2010, the Company discontinued consolidating the accounts of LSV Employee Group. The Company does not have any direct equity interest in LSV Employee Group.

In January 2010, the FASB deferred the new guidance for certain types of investment entities. The deferral allows asset managers that have no obligation to fund potentially significant losses of an investment entity to continue to apply the previous guidance to investment entities that have attributes of entities defined in the “Investment Company Guide.” The deferral applies to many mutual funds, hedge funds, private equity funds, venture capital and certain other types of entities. Also, money market funds subject to rule 2a-7 of the Investment Company Act of 1940 qualify for deferral. However, the deferral does not apply to the new disclosure requirements. All of the Company’s investment products where the Company is the sponsor and/or investment manager that are VIEs qualify for the deferral; therefore, the Company will continue to apply the previous guidance for the consolidation of VIEs (See Note 3).

Management’s Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Revenue Recognition

The Company’s principal sources of revenues are: (1) asset management, administration and distribution fees earned based upon a contractual percentage of net assets under management or administration; (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or non-recurring and based upon project-oriented contractual agreements related to client implementations; and (3) transaction-based fees for providing trade-execution services. The majority of the Company’s revenues are based on contractual arrangements. Revenues are recognized in the periods in which the related services are performed provided that persuasive evidence of an agreement exists, the fee is fixed or determinable, and collectibility is reasonably assured. Cash received by the Company in advance of the performance of services is deferred and recognized as revenue when earned. Reimbursements received for out-of-pocket expenses incurred are recorded as revenue. Certain portions of the Company’s revenues require management’s consideration of the nature of the client relationship in determining whether to recognize as revenue the gross amount billed or net amount retained after payments are made to suppliers for certain services related to the product or service offering.

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Cash and Cash Equivalents

The Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents include $281,760 and $383,946 at December 31, 2011 and 2010, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds.

Restricted Cash

Restricted cash includes $5,000 and $3,000 at December 31, 2011 and 2010, respectively, segregated for regulatory purposes related to trade-execution services conducted by SIEL. Restricted cash also includes $1,000 at December 31, 2011 and 2010 segregated in special reserve accounts for the benefit of SIDCO customers in accordance with certain rules established by the Securities and Exchange Commission for broker-dealers.

Allowances for Doubtful Accounts

The Company provides an allowance for doubtful accounts equal to the estimated uncollectible amounts. The Company’s estimate is based on historical collection experience and a review of the current status of trade accounts receivable.

Concentration of Credit Risk

Financial instruments which potentially expose the Company to concentrations of credit risk consist primarily of cash equivalents and trade receivables. Cash equivalents are principally invested in short-term money market funds or placed with major banks and high-credit qualified financial institutions. Cash deposits maintained with institutions are in excess of federally insured limits. Concentrations of credit risk with respect to our receivables are limited due to the large number of clients and their dispersion across geographic areas. No single group or customer represents greater than ten percent of total accounts receivable.

Property and Equipment

Property and Equipment are recorded at cost. Expenditures for major additions and improvements are capitalized and minor replacements, maintenance, and repairs are charged to expense as incurred. Construction in progress includes the cost of construction and other direct costs attributable to the construction. When property and equipment are retired or disposed of, the related cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is included in the results of operations for the respective period. Depreciation is provided over the estimated useful lives using the straight line method for financial statement purposes. No provision for depreciation is made for construction in progress until such time as the relevant assets are completed and put into service. The Company uses other depreciation methods, generally accelerated, for tax purposes where appropriate. Buildings and building improvements are depreciated over 25 to 39 years. Equipment, purchased software and furniture and fixtures have useful lives ranging from three to five years. Amortization of leasehold improvements is computed using the straight line method over the shorter of the remaining lease term or the estimated useful lives of the improvements.

Marketable Securities

The classification of investments in marketable securities is determined at the time of purchase and reevaluated at each balance sheet date. Debt and equity securities classified as available-for-sale are reported at fair value as determined by the most recently traded price of each security at the balance sheet date. Unrealized gains and losses, net of income taxes, are reported as a separate component of comprehensive income. SIDCO, the Company’s broker-dealer subsidiary, reports changes in fair value of marketable securities through current period earnings due to specialized accounting practices related to investments by broker-dealers. The Company records all of its trading securities on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these securities are recognized in current period earnings. The specific identification method is used to compute the realized gains and losses on all of the Company’s marketable securities (See Note 6).

The Company evaluates the realizable value of its marketable securities on a quarterly basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. Some of the factors considered in determining other-than-temporary impairment for equity securities include, but are not limited to, significant or prolonged declines in the

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fair value of the investments, the Company’s ability and intent to retain the investment for a period sufficient to allow the value to recover, and the financial condition of the investment. Some of the factors considered in determining other-than-temporary impairment for debt securities include, but are not limited to, the intent of management to sell the security, the likelihood that the Company will be required to sell the security before recovering its cost, and management’s expectation to recover the entire amortized cost basis of the security even if there is no intent to sell the security.

Fair Value of Financial Instruments

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The fair value hierarchy describes three levels of inputs that may be used by the Company to measure fair value:

Level 1 – Quoted prices in active markets for identical assets or liabilities without adjustment. The Company’s Level 1 assets primarily include investments in mutual funds sponsored by SEI and LSV that are quoted daily.

Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company’s Level 2 assets primarily include securities issued by the Government National Mortgage Association (GNMA) and other U.S. government agency securities that are single issuer pools that are valued based on current market data for the specific issue owned or pools of similar securities. The Company uses a pricing vendor to value its GNMA securities. The pricing vendor uses a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data for similar pools of GNMA securities.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, or similar techniques, as well as instruments for which the determination of fair value requires significant judgment by management. The Company’s Level 3 financial assets primarily include structured investment vehicles (SIV) securities and any change in fair value for these securities is recognized in the current period.

The fair value of an asset or liability may include inputs from more than one level in the fair value hierarchy. The lowest level of significant inputs used to value the asset or liability determines which level the asset or liability is classified in its entirety.

See Note 5 for information on related disclosures regarding fair value measurements.

Capitalized Software

Costs incurred for the development of internal use software to be offered in a hosting arrangement is capitalized during the development stage of the software application. These costs include direct external and internal costs to design the software configuration and interfaces, coding, installation, and testing. Costs incurred during the preliminary and post-implementation stages of the software application are expensed as incurred. Costs associated with significant enhancements to a software application are capitalized while costs incurred to maintain existing software applications are expensed as incurred. The capitalization of software development costs requires considerable judgment by management with respect to certain external factors, including, but not limited to, technological and economic feasibility, and estimated economic life. Capitalized software development costs in 2011, 2010 and 2009 primarily relate to the further development of the Global Wealth Platform (GWP). The initial version of GWP was placed into service in July 2007. Further enhancements and upgrades will continue to occur through a series of releases. As of December 31, 2011, the net book value of GWP was $296,687, net of accumulated amortization of $87,762. Capitalized software development costs in-progress at December 31, 2011 associated with future releases to GWP were $11,552. The Company capitalized $40,954, $38,729, and $43,944 of software development costs during 2011, 2010, and 2009, respectively.

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Amortization of capitalized software development costs begins when the product is ready for its intended use. Capitalized software development costs are amortized on a product-by-product basis using the straight-line method over the estimated economic life of the product or enhancement, which is primarily 3 to 15 years, with a weighted average remaining life of approximately 10.5 years. Amortization expense was $26,153, $23,053, and $35,894 in 2011, 2010, and 2009, respectively, and is included in Amortization expense on the accompanying Consolidated Statements of Operations. GWP has an estimated useful life of 15 years and a weighted average remaining life of 10.5 years. The Company abandoned certain components within GWP that were replaced in late 2009. The useful life of these components was shortened so that the remaining net book value of $15,502 was fully amortized commensurate with the new release. Amortization expense in 2009 on the Consolidated Statements of Operations includes $15,502 of accelerated amortization for these components.

The Company evaluates the carrying value of capitalized software development costs when circumstances indicate the carrying value may not be recoverable. The review of capitalized software development costs for impairment requires significant assumptions about operating strategies, underlying technologies utilized, and external market factors. External market factors include, but are not limited to, expected levels of competition, barriers to entry by potential competitors, stability in the target market and governmental regulations. In 2011 and 2010, the Company determined that no events or change in circumstances had occurred that would indicate that capitalized software development costs were impaired. Therefore, the Company did not recognize any impairment charges for any of its capitalized software development costs in 2011 or 2010.

Income Taxes

The Company applies the asset and liability approach to account for income taxes whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The components of the deferred tax assets and liabilities are individually classified as current and non-current based on their characteristics.

Foreign Currency Translation

The assets and liabilities and results of operations of the Company’s foreign subsidiaries are measured using the foreign subsidiary’s local currency as the functional currency. Assets and liabilities have been translated into U.S. dollars using the rates of exchange at the balance sheet dates. The results of operations have been translated into U.S. dollars at average exchange rates prevailing during the period. The resulting translation gain and loss adjustments are recorded as a separate component of comprehensive income.

Transaction gains and losses that arise from exchange rate fluctuations are included in the results of operations in the periods in which they occur, and are immaterial for each of the years in the three year period ended December 31, 2011.

Earnings Per Common Share

Basic earnings per common share is computed by dividing net income attributable to SEI Investments common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per common share is computed by dividing net income attributable to SEI Investments common shareholders by the combination of the weighted average number of common shares outstanding and the dilutive potential common shares, such as stock options, outstanding during the period. The calculations of basic and diluted earnings per share for 2011, 2010, and 2009 are:

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	For the Year ended December 31, 2011
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	204,959		182,547	$	1.12
Dilutive effect of stock options		0		1,580
Diluted earnings per common share	$	204,959		184,127	$	1.11

	For the Year ended December 31, 2010
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	231,687		188,468	$	1.23
Dilutive effect of stock options		0		1,853
Diluted earnings per common share	$	231,687		190,321	$	1.22

	For the Year ended December 31, 2009
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	174,335		190,821	$	0.91
Dilutive effect of stock options		0		962
Diluted earnings per common share	$	174,335		191,783	$	0.91

Employee stock options to purchase approximately 15,914,000, 13,181,000, and 22,997,000 shares of common stock, with an average exercise price per share of $23.07, $23.79, and $21.47, were outstanding during 2011, 2010, and 2009, respectively, but not included in the computation of diluted earnings per common share because the option’s exercise price was greater than the average market price of the Company’s common stock and the effect on diluted earnings per common share would have been anti-dilutive (See Note 8).

Stock-Based Compensation

Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which is the vesting period. The Company uses historical data to estimate pre-vesting forfeitures and record stock-based compensation expense only for those awards that are expected to vest. The amount of stock-based compensation expense that is recognized in a given period is dependent upon management’s estimate of when the vesting targets are expected to be achieved. If this estimate proves to be inaccurate, the remaining amount of stock-based compensation expense could be accelerated, spread out over a longer period, or reversed (See Note 8).

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New Accounting Pronouncements

In May 2011, the Financial Accounting Standards Board (FASB) issued a final Accounting Standards Update which represents the converged guidance of the FASB and the International Accounting Standards Board on fair value measurement. The guidance clarifies how a principal market is determined, addresses the fair value measurement of instruments with offsetting market or counterparty credit risks, addresses the concept of valuation premise and highest and best use, extends the prohibition on blockage factors to all three levels of the fair value hierarchy and requires additional disclosures. The guidance is effective for interim and annual periods beginning after December 15, 2011 and is applied prospectively. The Company does not expect the adoption of the guidance to have a significant impact on its consolidated financial statements.

In June 2011, the FASB issued a final Accounting Standards Update to amend the presentation of comprehensive income in financial statements. This new guidance allows companies the option to present other comprehensive income in either a single continuous statement or in two separate but consecutive statements. Under both alternatives, companies will be required to present each component of net income and comprehensive income. The guidance is effective for interim and annual periods beginning after December 15, 2011 and is applied retrospectively. The Company does not expect the adoption of the guidance to have any impact on its consolidated financial statements.

Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation.

Note 2 – Investment in Unconsolidated Affiliate

The Company has an investment in LSV, a general partnership and registered investment advisor that provides investment advisory services to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a number of SEI-sponsored mutual funds. As of December 31, 2011, the Company’s total partnership interest in LSV was approximately 41 percent.

LSV Employee Group is owned by several current employees of LSV and was formed for the sole purpose of owning a partnership interest in LSV. The Company does not own any interest in LSV Employee Group. In 2006, LSV Employee Group purchased an eight percent interest in LSV from two existing partners. LSV Employee Group obtained financing in the form of a term loan pursuant to the terms of a Credit Agreement to purchase the eight percent interest in LSV. The Company agreed to provide a Guaranty Agreement to the lenders of all obligations of LSV Employee Group under the Credit Agreement. The lenders have the right to seek payment from the Company of all obligations of LSV Employee Group under the Credit Agreement in the event of default. The Company’s direct interest in LSV was unchanged as a result of this transaction.

As a result of providing the Guaranty Agreement, LSV Employee Group became a VIE and the Company was considered the primary beneficiary. Also, given the Company’s direct ownership of 43 percent in LSV at the time of this transaction in 2006 and its controlling interest in LSV Employee Group through the Guaranty Agreement, the Company was required to consolidate the assets, liabilities and operations of LSV and LSV Employee Group. The partnership interest of the other existing partners of LSV was included in Noncontrolling interest.

In January 2010, new accounting guidance pertaining to the consolidation of VIEs became effective. Under the new guidance, the Company was not considered the primary beneficiary of LSV Employee Group. The Company, therefore, discontinued consolidating the accounts and operations of LSV and LSV Employee Group in its financial statements. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheet and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statement of Operations. The deconsolidation of LSV had no effect on Net income attributable to SEI. Prior period financial statements are not reclassified for the new accounting guidance.

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LSV Asset Management

At December 31, 2011, the Company’s total investment in LSV was $60,954. The investment in LSV exceeded the underlying equity in the net assets of LSV by $3,717, of which $3,062 is considered goodwill embedded in the investment. The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distribution payments from LSV for $109,273, $93,302 and $73,518 in 2011, 2010 and 2009, respectively. The partnership distribution payment of $21,242 received in January 2010 is reflected in LSV and LSV Employee Group cash balances, net on the accompanying Consolidated Statement of Cash Flows.

These tables contain condensed financial information of LSV:

Condensed Statement of Operations Year ended December 31,	2011		2010
Revenues	$	296,397	$	273,381
Net income	$	257,519	$	239,981

Condensed Balance Sheet December 31,	2011		2010
Cash and cash equivalents	$	60,728	$	64,464
Accounts receivable, net of allowance for doubtful accounts of $804 and $369		75,269		75,056
Prepaid expenses and other current assets		604		848
Non-current assets		3,880		4,159
Total assets	$	140,481	$	144,527
Current liabilities	$	13,933	$	11,199
Partners’ capital		126,548		133,328
Total liabilities and partners’ capital	$	140,481	$	144,527

LSV Employee Group

At the time of LSV Employee Group’s purchase of an eight percent interest in LSV, it was determined that $72,220 of the purchase price related to identifiable intangible assets and $19,780 was goodwill. The identifiable intangible assets have an estimated useful life of ten years and were amortized on a straight-line basis. Prior to the deconsolidation of LSV Employee Group from the Company’s financial statements, amortization expense in 2009 on the accompanying Consolidated Statement of Operations included $7,222 pertaining to the amortization of the intangible assets, but was eliminated through Noncontrolling interest and had no impact on net income.

In order to finance a portion of the purchase price, LSV Employee Group obtained financing from Bank of America, N.A. (Bank of America) and certain other lenders in the form of a term loan pursuant to the terms of a Credit Agreement. The principal amount of the term loan was $82,800. In January 2011, LSV Employee Group and Bank of America agreed to amend the Credit Agreement and extend the maturity date of the loan from January 2011 to July 2012. The Company’s obligations under the Guaranty Agreement remained in full force and effect with respect to the amended Credit Agreement. LSV Employee Group made the final principal payment of the term loan in October 2011 and the Company has no further obligation regarding the Credit Agreement. LSV Employee Group made principal payments of $10,091 and $10,461 during 2011 and 2010.

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Prior to the deconsolidation of LSV Employee Group from the Company’s financial statements, interest expense in 2009 on the Consolidated Statement of Operations includes $1,510 in interest costs related to the term loan which were eliminated through Noncontrolling interest and had no impact on net income.

LSV Employee Group II

In April 2011, a group of existing employees of LSV agreed to purchase a partnership interest of an existing LSV employee for $4,300 of which $3,655 was financed through a new term loan with Bank of America. The group of existing LSV employees formed a new limited liability company, LSV Employee Group II, LLC (LSV Employee Group II). The Company provided an unsecured guaranty to the lenders of all the obligations of LSV Employee Group II. The lenders will have the right to seek payment from the Company in the event of a default by LSV Employee Group II. The term loan has a four year term and will be repaid from the quarterly distributions of LSV. LSV Employee Group II made principal payments of $458 during 2011. As of December 31, 2011, the remaining unpaid principal balance of the term loan was $3,197. This amount is not reflected, nor is it required to be reflected, in the Company’s Consolidated Balance Sheet at December 31, 2011.

The Company’s direct interest in LSV was unchanged as a result of this transaction. The Company has determined that LSV Employee Group II is a variable interest entity (VIE); however, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group II either directly or through any financial responsibility from the guaranty.

In January 2012, LSV Employee Group II made a principal payment of $219. As of January 31, 2012, the remaining unpaid principal balance of the term loan was $2,978. The Company, in its capacity as guarantor, currently has no obligation of payment relating to the term loan of LSV Employee Group II and, furthermore, fully expects that LSV Employee Group II will meet all of their future obligations regarding the term loan.

Proforma Financial Information (Unaudited)

The unaudited proforma financial information for the year ended December 31, 2009 presents the historical results of the Company as if the accounts and operations of LSV and LSV Employee Group had not been consolidated and LSV had been accounted for under the equity method. Net income attributable to SEI was unchanged due to this transaction but is presented for the purpose of clarification.

Proforma Unaudited Condensed Statement of Operations Year ended December 31,	2009
Revenues	$	848,587
Expenses		(658,434	)
Income from operations		190,153
Other income, net		87
Equity in the earnings of unconsolidated affiliate		75,415
Net income before income taxes		265,655
Income taxes		89,886
Net income		175,769
Less: Net income attributable to the noncontrolling interest		(1,434	)
Net income attributable to SEI Investments	$	174,335

Note 3 – Variable Interest Entities – Investment Products

The Company has created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities.

An entity that lacks decision-making rights is a VIE. In some circumstances, the Manager or Trustee of the Company’s investment products controls the governing decisions about the investment activities with respect to the ongoing operations of the investment products without the equity investors possessing the right to remove the Manager or Trustee. Therefore, the equity investors, as a group, do not have the ability to make decisions that have an impact on the ongoing activities of such investment products. Consequently, some of the Company’s investment products have been determined to be VIEs at inception.

The VIEs are marketed with investment objectives to generate positive returns; however, the nature of such investments exposes the investors to the risk that the value of the VIEs may increase or decrease. The purpose and design of the VIEs are to achieve the investment objective by implementing strategies which are designed to minimize potential losses; however, there is no assurance given that these strategies will be successful.

The Company does not have a significant equity investment in any of the VIEs and does not have an obligation to enter into any guarantee agreements with the VIEs. The fees paid to the decision maker of a VIE are considered to be variable interests if the decision maker is not subject to substantive kick-out rights. The fees paid to the Company represent a variable interest when the decision maker is not subject to substantive kick-out rights.

The Company is not the primary beneficiary of the VIEs because the expected fees and the expected return on any investment into the VIE by the Company relative to the expected returns of the VIE to the equity investor holders does not approach 50 percent of the expected losses or gains of the VIEs.

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Therefore, the Company is not required to consolidate any investment products that are VIEs into its financial statements. The Company’s variable interest in the VIEs, which consists of management fees and in some situations, seed capital, would not be considered a significant variable interest.

The risks to the Company associated with its involvement with any of the investment products that are VIEs are limited to the cash flows received from the revenue generated for asset management, administration and distribution services and any equity investments in the VIEs. Both of these items are immaterial. The Company has no other financial obligation to the VIEs.

Amounts relating to fees received from the VIEs included in Receivables and amounts relating to equity investments in the VIEs included in Investments Available for Sale on the Company’s Consolidated Balance Sheets are immaterial to the total current assets of the Company.

Note 4 – Composition of Certain Financial Statement Captions

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:

	2011			2010
Trade receivables	$	37,822		$	34,528
Fees earned, not billed		92,916			93,506
Other receivables		12,295			9,651
		143,033			137,685
Less: Allowance for doubtful accounts		(924	)		(1,195	)
Receivables, net	$	142,109		$	136,490

Fees earned, not billed represents receivables earned but unbilled and results from timing differences between services provided and contractual billing schedules. These billing schedules generally provide for fees to be billed on a quarterly basis.

Receivables from regulated investment companies on the accompanying Consolidated Balance Sheets primarily represent fees receivable for distribution, investment advisory, and administration services to various regulated investment companies sponsored by SEI (See Note 14).

Property and Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:

	2011			2010
Buildings	$	136,949		$	135,935
Equipment		64,256			63,902
Land		9,929			9,890
Purchased software		77,971			74,720
Furniture and fixtures		17,999			18,566
Leasehold improvements		4,558			4,250
Construction in progress		339			121
		312,001			307,384
Less: Accumulated depreciation		(182,453	)		(166,816	)
Property and Equipment, net	$	129,548		$	140,568

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Depreciation expense related to property and equipment for 2011, 2010, and 2009 was $21,471, $21,902, and $21,531, respectively.

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Other Assets

Other assets consist of long-term prepaid expenses, deposits, other investments at cost and various other assets. Amortization expense for certain other assets for 2011, 2010, and 2009 was $1,135, $995 and $1,055, respectively.

The Company recognized gains of $3,072 in 2010 due to the sale of its entire ownership interest in a small, private company that was involved in a merger. The Company’s investment in the firm had been accounted for under the cost basis. The gain is reflected in Net gain (loss) on investments on the accompanying Consolidated Statements of Operations.

Accrued Liabilities

Accrued Liabilities on the accompanying Consolidated Balance Sheets consist of:

	2011		2010
Accrued employee compensation	$	48,112	$	43,747
Accrued employee benefits and other personnel		5,408		6,988
Accrued consulting, outsourcing and professional fees		17,477		16,390
Accrued brokerage fees		8,665		11,942
Accrued sub-advisory, distribution and other asset management fees		17,091		16,778
Accrued income taxes		0		2,077
Accrued dividend payable		26,518		0
Other accrued liabilities		23,773		23,488
Accrued liabilities	$	147,044	$	121,410

Note 5 – Fair Value Measurements

The fair value of the Company’s financial assets and liabilities is determined in accordance with the fair value hierarchy. The fair value of the Company’s financial assets, except for the fair value of senior notes issued by SIVs, is determined using Level 1 or Level 2 inputs and consist mainly of investments in equity and fixed-income mutual funds that are quoted daily and GNMA and other U.S. government agency securities that are single issuer pools that are valued based on current market data for the specific issue owned or pools of similar securities. Level 3 financial assets primarily consist of senior note obligations issued by SIVs. The Company did not have any Level 3 financial liabilities at December 31, 2011 or 2010. There were no transfers of financial assets between levels within the fair value hierarchy during 2011 or 2010.

Valuation of SIV Securities

The underlying collateral of the SIV securities is mainly comprised of asset-backed securities and collateralized debt obligations. The Company received prices for all of its SIV securities from two independent third party firms. Given the lack of any reliable market data on the SIV securities, the firms utilized a valuation model that employs a net asset approach which considers the value of the underlying collateral of the SIV securities to determine the fair value of the SIV securities. Management evaluates the prices received from these firms and considers other information, such as the existence of any current market activity, to determine the fair value of the SIV securities. The underlying collateral is specifically identified by its CUSIP or ISIN number. In January 2011, the Company sold the senior obligation originally issued by Stanfield Victoria. The Company’s sole remaining SIV security consists of the senior note issued by Gryphon.

The valuation model maintained by the third party firm to value the SIV securities owned as of December 31, 2010 (except the Stanfield Victoria note) obtained price quotes for each security that comprised the underlying collateral of the SIV securities. Price quotes were primarily obtained from two pricing vendors that are independent entities of the firm that maintained the valuation model. Other pricing vendors were used in limited situations when a security quote cannot be obtained from either of the two primary pricing vendors. The average of the two quotes received was used to value each security. A portion of the securities that comprised the underlying collateral of the SIV securities could

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not be priced by the pricing vendors. For these securities that lack price quotes, the last price quote received was adjusted by the weighted average percentage movement of securities held as collateral within the same sector classification or based upon the weighted average movement of all priced securities. For example, a residential mortgage-backed security that has not received a quote for an extended period of time was adjusted by the weighted average percentage movement of all quoted residential mortgage-backed securities held as collateral by the SIV security. Additionally, the securities were aggregated by type or sector (i.e. home equity line of credit, sub-prime 1^st liens, residential mortgage-backed securities, etc.) and the weighted average quote of all securities within a sector held by the SIV was compared with the range of quotes received for similar securities within the same sector from the trading desk of an affiliate of the third party firm that maintains the SIV valuation model. The weighted average quote of all securities within a sector held by the SIV must be within the range of quotes received from the trading desk within that same sector. If the weighted average quote for all securities within a sector held by the SIV was outside that range, the average quote received from the pricing vendors was adjusted. In any event, the value assigned to each security held by the SIV was the lower of (i) the average of the quotes received from the pricing vendors or (ii) the lowest quote received from the trading desk for a similar security.

The pricing vendors used by the firm that maintained the valuation model utilize widely-accepted pricing models, which are evaluated by the pricing vendor, that vary by asset class and incorporate available trade, bid, and other market information. The market inputs that these pricing vendors sought for their evaluation of securities included: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and other available market data. Broker quotes may be binding or non-binding. For certain security types, additional inputs may be used. The pricing vendors may prioritize inputs differently from time to time for any security based on current market conditions. For each asset class, the pricing vendor used a team of evaluators that gathered information from market sources and integrated relevant credit information, perceived market movements and sector news into the evaluated pricing models. For a structured security evaluation, including mortgage-backed securities, these evaluators considered various characteristics including issuer, vintage, purpose of loan, collateral attributes, prepayment speeds and credit ratings in order to properly identify trades and quotes for similar securities which are gathered for use in the evaluation process. Evaluators follow multiple review processes throughout each month that assess the available market, credit and deal level information in support of the evaluation process. If it is determined that sufficient objectively verifiable information does not exist to support a security’s valuation, the pricing vendor discontinued providing a quote on that security. As previously stated, securities that lack a quote from a pricing vendor are valued using the most recent quoted price and adjusting that price by the weighted average percentage change in the respective sector of all other similar securities that are held by the SIV.

The model used by the second independent valuation firm to determine the fair value of the Stanfield Victoria note as of December 31, 2010 and the Gryphon Note as of December 31, 2011 also utilized a net asset approach that attempts to value the underlying collateral of the SIV securities through the use of industry accepted and proprietary valuation techniques and models. This approach combines advanced analytics with real-time market information that incorporate structural and fundamental analysis, collateral characteristics, recent market developments and current trading activity for each security. Each security that makes up the underlying collateral is analyzed by using observable collateral characteristics and credit statistics in order to project future performance and expected cash flows for each individual security. The projected cash flows incorporate assumptions and expectations based upon the foregoing analysis of the collateral characteristics such as, but not limited to, default probabilities, recovery rates, prepayment speeds and loss severities. Expected future cash flows are discounted at an appropriate yield derived from the individual security, structural and collateral characteristics, trading levels and other available market data. Different modeling techniques and associated inputs and assumptions may be used to project future cash flows for each security depending upon the asset classification of that individual security (i.e. residential mortgage-backed security, commercial mortgage-backed security, collateralized debt obligations, etc.). The aggregate value of the discounted cash flows of the underlying collateral is compared to the total remaining par value of the collateral to determine the expected recovery price, or fair value, of the remaining note obligations.

Management may also consider, when available, price quotes from brokers and dealers. If a price quote is available, management will compare this number to the fair value derived from the valuation models of the two independent firms giving consideration to other market factors and risk premiums. Given the lack of any significant trading activity for any of the SIV securities owned by the Company,

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management believes that market prices for any SIV securities may not represent the implied fair value of the SIV securities owned by the Company.

Management evaluates current market transactions, if any, for each of the SIV securities. In the event a market transaction does exist for a SIV security, management evaluates the publicly available information surrounding the transaction in order to assess if the price used represents the fair value for the SIV security. In management’s opinion, the current market for SIV securities does not represent any orderly and efficient market.

The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:

			At December 31, 2011
			Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	8,010	$	8,010	$	0	$	0
Fixed-income available-for-sale securities		74,998		0		74,998		0
Fixed income securities owned		20,949		0		20,949		0
Trading securities		56,325		3,702		0		52,623
	$	160,282	$	11,712	$	95,947	$	52,623

			At December 31, 2010
			Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	5,853	$	5,853	$	0	$	0
Fixed-income available-for-sale securities		68,917		0		68,917		0
Trading securities		104,594		3,949		0		100,645
	$	179,364	$	9,802	$	68,917	$	100,645

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The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2010 to December 31, 2011:

	Trading Securities
Balance, January 1, 2010	$	120,714
Purchases		536
Issuances		0
Principal prepayments and settlements		(45,857	)
Sales		(18,995	)
Total gains or (losses) (realized/unrealized):
Included in earnings		44,247
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance, December 31, 2010	$	100,645
Purchases		1,215
Issuances		0
Principal prepayments and settlements		(17,921	)
Sales		(34,706	)
Total gains or (losses) (realized/unrealized):
Included in earnings		3,390
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance, December 31, 2011	$	52,623

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Note 6 – Marketable Securities

Investments Available For Sale

Investments available for sale classified as non-current assets consist of:

	For the Year ended December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	8,243	$	48	$	(360	)	$	7,931
Other mutual funds		69		10		0			79
Debt securities		70,604		4,394		0			74,998
	$	78,916	$	4,452	$	(360	)	$	83,008

	For the Year Ended December 31, 2010
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	5,086	$	279	$	(14	)	$	5,351
Other mutual funds		443		59		0			502
Debt securities		67,118		1,799		0			68,917
	$	72,647	$	2,137	$	(14	)	$	74,770

Net unrealized holding gains were $2,574 (net of income tax expense of $1,518) at December 31, 2011. At December 31, 2010, net unrealized holding gains were $1,339 (net of income tax expense of $784). These unrealized gains are reported as separate components of Accumulated other comprehensive income on the accompanying Consolidated Balance Sheets.

The Company recognized gross realized gains from available-for-sale securities of $255, $184 and $440 in 2011, 2010 and 2009, respectively. Gross realized losses in 2009 were $123. Gross realized losses in 2011 and 2010 were minimal.

The Company had investments in two SEI-sponsored mutual funds which primarily invest in fixed-income securities, including debt securities issued by municipalities and mortgage-backed securities. In 2009, management determined that the decline in market value for one of these mutual funds was other-than-temporary and, therefore, recorded an impairment charge for $901. The other-than-temporary impairment charge is included in Net gain (loss) on investments on the Consolidated Statements of Operations.

The Company’s debt securities are issued by the Government National Mortgage Association and are backed by the full faith and credit of the U.S. government. These securities were purchased to satisfy applicable regulatory requirements of SPTC and have maturity dates which range from 2020 to 2041.

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Trading Securities

Trading securities of the Company consist of:

	For the Year ended December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	146,363	$	0	$	(94,955	)	$	51,408
LSV-sponsored mutual funds		2,049		1,653		0			3,702
Other investments		1,215		0		0			1,215
	$	149,627	$	1,653	$	(94,955	)	$	56,325

	For the Year ended December 31, 2010
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	231,026	$	0	$	(130,381	)	$	100,645
LSV-sponsored mutual funds		2,049		1,900		0			3,949
	$	233,075	$	1,900	$	(130,381	)	$	104,594

The Company records all of its trading securities on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these securities are recognized in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations.

During 2011 and 2010, the Company recognized net gains from SIV securities of $3,390 and $44,247, respectively. Of the net gains recognized during 2011, gains of $10,614 resulted from cash payments received from the SIV securities offset by losses of $7,224 which resulted from a decrease in fair value at December 31, 2011. During 2010, the Company recognized gains from SIV securities of $44,247, of which $27,510 resulted from cash payments received from the SIV securities and $16,460 was from a net increase in fair value at December 31, 2010. In addition, the Company recognized a net gain of $277 from sales of three SIV securities during 2010. The cumulative loss recognized by the Company pertaining to these SIV securities sold in 2010 was $17,944. The net gains (losses) from the SIV securities are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations.

In January 2011, the Company sold the senior note obligation originally issued by Stanfield Victoria. There was no gain or loss recognized by the Company from the sale of the note as the fair value of the Stanfield Victoria note at December 31, 2010 was not different than the sale price received. Currently, the Company’s remaining SIV security consists of the senior note obligation issued by Gryphon.

The Company has an investment related to the startup of mutual funds sponsored by LSV. These are U.S. dollar denominated funds that invests primarily in securities of Canadian, Australian and Japanese companies as well as various other global securities. The underlying securities held by the funds are translated into U.S. dollars within the funds. During the three months ended June 30, 2010, the Company sold a portion of its investment in the LSV-sponsored funds. Additionally, the Company sold all of the equity and currency futures contracts originally purchased as part of an economic strategy to minimize exposure to price and currency risk related to the investment. The net gains recognized from the partial sale of the LSV-sponsored funds and the equity and futures contracts were minimal. As of December 31, 2011, the Company’s remaining investment in the LSV-sponsored funds had a cost value of $2,049 and a fair value of $3,702.

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Securities Owned

During 2011, the Company’s broker-dealer subsidiary, SIDCO, made investments in U.S. government agency and commercial paper securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $20,949 at December 31, 2011. The change in fair value of the securities recognized in 2011 was minimal.

Note 7 – Lines of Credit:

The Company maintained a $300,000 revolving line of credit through a Credit Agreement (Credit Facility), as amended, with JPMorgan Chase Bank, N.A. and a syndicate of other lenders which was scheduled to expire in July 2012. Outstanding borrowings under the Credit Facility accrued interest at 0.450 percent above the London Interbank Offer Rate (LIBOR) during 2011. There was also a commitment fee equal to 0.09 percent per annum on the daily unused portion of the facility charged to the Company during 2011. The Credit Facility, as amended, contained covenants that restricted the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. None of the covenants of the Credit Facility negatively affected the Company’s liquidity or capital resources. As of December 31, 2011, the Company’s ability to borrow from the Credit Facility was not limited by any covenant of the agreement.

In 2009, the Company borrowed $254,000 from the Credit Facility to finance the purchase of SIV securities from SEI-sponsored money market mutual funds (See Note 6). The Company made principal payments of $95,000, $138,000 and $21,000 during 2011, 2010 and 2009, respectively, to fully repay the outstanding balance of the Credit Facility. The Company was in compliance with all covenants of the Credit Facility during 2011.

The average rates applied to the Credit Facility during 2011, 2010 and 2009 were 0.68 percent, 0.77 percent and 1.05 percent, respectively. The Company incurred $585, $1,478, and $2,491 in interest charges and commitment fees relating to the Credit Facility during 2011, 2010, and 2009, respectively, which are reflected in Interest expense on the accompanying Consolidated Statements of Operations.

The Company considers the book value of long-term debt on the accompanying Consolidated Balance Sheet at December 31, 2010 related to the borrowings through the Credit Facility to be representative of its fair value. The Company had no borrowings through the Credit Facility at December 31, 2011.

On February 2, 2012 (the Closing Date), the Company terminated the Credit Facility agreement and entered into a new five-year $300,000 Credit Agreement (the 2012 Credit Facility) with Wells Fargo Bank, National Association, and a syndicate of other lenders. The 2012 Credit Facility became available on the Closing Date and is scheduled to expire in February 2017, at which time any aggregate principal amount of loans outstanding becomes payable in full. Any borrowings made under the 2012 Credit Facility will accrue interest at 1.250 percent above LIBOR. There is also a commitment fee equal to 0.15 percent per annum on the daily unused portion of the facility. The aggregate amount of the 2012 Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The 2012 Credit Facility contains covenants that restrict the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. In the event of a default under the 2012 Credit Facility, the Company would also be restricted from paying dividends on, or repurchasing, its common stock without the approval of the lenders. None of the covenants of the 2012 Credit Facility negatively affect the Company’s liquidity or capital resources. Both the interest rate and commitment fee prices may increase if the Company’s leverage ratio reaches certain levels. Upon the occurrence of certain financial or economic events, significant corporate events, or certain other events of default constituting an event of default under the 2012 Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the 2012 Credit Facility may be terminated.

The Company’s Canadian subsidiary has a credit facility agreement (the Canadian Credit Facility) for the purpose of facilitating the settlement of mutual fund transactions. The Canadian Credit Facility has no stated expiration date. The amount of the facility is generally limited to $2,000 Canadian dollars or

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the equivalent amount in U.S. dollars. The Canadian Credit Facility does not contain any covenants which restrict the liquidity or capital resources of the Company. The Company had no borrowings under the Canadian Credit Facility and was in compliance with all covenants during 2011.

Note 8 – Shareholders’ Equity:

Stock-Based Compensation

The Company currently has one active equity compensation plan, the 2007 Equity Compensation Plan (the 2007 Plan), which provides for the grant of incentive stock options, non-qualified stock options and stock appreciation rights with respect to up to 20 million shares of common stock of the Company, subject to adjustment for stock splits, reclassifications, mergers and other events. Permitted grantees under the 2007 Plan include employees, non-employee directors and consultants who perform services for the Company. The plan is administered by the Compensation Committee of the Board of Directors of the Company. The Company has only granted non-qualified stock options under the plan.

The Company discontinued any further grants under the Company’s 1998 Equity Compensation Plan (the 1998 Plan) as a result of the approval of the 2007 Plan. No options are available for grant from this plan. Grants made from the 1998 Plan continue in effect under the terms of the grant.

All outstanding stock options have performance-based vesting provisions that tie the vesting of stock options to the Company’s financial performance. The Company’s stock options vest at a rate of 50 percent when a specified diluted earning per share target is achieved, and the remaining 50 percent when a second, higher specified diluted earnings per share target is achieved. Stock options granted prior to 2006 fully vest after seven years from the date of grant. Beginning in 2006, the seven year vesting trigger was eliminated and, as a result, options do not vest due to the passage of time but solely as a result of achievement of the financial vesting targets. Earnings per share targets are calculated exclusive of stock-based compensation expense, net of tax. The diluted earnings per share targets are established at time of grant and are measured annually on December 31. The amount of stock-based compensation expense is based upon management’s estimate of when the earnings per share targets may be achieved. If management’s estimate of the attainment of the earnings per share targets proves to be inaccurate, the remaining amount of stock-based compensation expense could be accelerated, spread out over a longer period, or reversed. This may cause volatility in the recognition of stock-based compensation expense in future periods and could materially affect the Company’s net income and net income per share.

The Company uses the Black-Scholes option pricing model to determine the fair value of stock options. The determination of the fair value of stock options on the date of grant using an option-pricing model is affected by the price of the Company’s common stock as well as other variables. These variables include expected stock price volatility over the term of the awards, actual and projected employee stock exercise behaviors, risk-free interest rate and expected dividends. The Company primarily uses historical data to estimate the variables used in the option-pricing model except expected volatility. The Company uses a combination of historical and implied volatility. The Company estimates forfeitures at the time of grant and may revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting forfeitures and record stock-based compensation expense only for those awards that are expected to vest. Stock-based compensation is amortized over the requisite service periods of the awards, which are generally the vesting periods.

The weighted average fair value of the Company’s stock options granted during 2011, 2010 and 2009 were $5.70, $9.65 and $7.24, respectively, using the following assumptions:

	2011			2010			2009
Expected term (in years)		7.65			7.45			7.49
Expected volatility		40.43	%		36.35	%		37.44	%
Expected dividend yield		1.90	%		0.84	%		1.02	%
Risk-free interest rate		1.66	%		3.01	%		3.31	%

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The Company recognized stock-based compensation expense in its Consolidated Financial Statements in 2011, 2010 and 2009 as follows:

	2011			2010			2009
Stock-based compensation expense	$	14,112		$	26,783		$	14,503
Less: Deferred tax benefit		(5,332	)		(10,068	)		(4,636	)
Stock-based compensation expense, net of tax	$	8,780		$	16,715		$	9,867

During 2010, the Company revised its estimates of when some vesting targets are expected to be achieved. These changes in management’s estimates resulted in an increase of $11,663 in stock-based compensation expense in 2010. Additionally, during the three months ended September 30, 2010, the Company reversed $6,375 of previously-recognized stock-based compensation costs pertaining to option grants which management does not expect to vest. Management does not expect to recognize any compensation cost associated with these option grants. As of December 31, 2010, these option grants have an unrecognized compensation cost of $27,460.

The Company reduced the amount of stock-based compensation expense recognized in 2009 by $8,223 due to a change in management’s estimate of when certain vesting targets are expected to be achieved.

As of December 31, 2011, there was approximately $48,123 of unrecognized compensation cost remaining, adjusted for estimated forfeitures, related to unvested employee stock options that the Company expects will vest. The Company estimates that compensation cost will be recognized according to the following schedule:

Period	Stock-Based Compensation Expense
2012	$	14,398
2013		12,704
2014		12,510
2015		3,846
2016		2,355
2017		2,310
	$	48,123

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This table presents certain information relating to the Company’s stock option plans for 2011, 2010, and 2009:

	Number of Shares			Weighted Avg. Price
Balance as of December 31, 2008		28,883,000		$	19.90
Granted		4,222,000			17.66
Exercised		(2,055,000	)		10.53
Expired or canceled		(2,086,000	)		21.87
Balance as of December 31, 2009		28,964,000		$	20.09
Granted		2,883,000			23.84
Exercised		(1,633,000	)		16.04
Expired or canceled		(2,333,000	)		23.68
Balance as of December 31, 2010		27,881,000		$	20.42
Granted		2,534,000			15.77
Exercised		(1,364,000	)		16.37
Expired or canceled		(2,008,000	)		22.07
Balance as of December 31, 2011		27,043,000		$	20.06
Exercisable as of December 31, 2011		11,680,000		$	17.22
Available for future grant as of December 31, 2011		4,622,000

As of December 31, 2010 and 2009, there were 14,247,000 and 11,801,000 shares exercisable, respectively. The expiration dates for options outstanding at December 31, 2011 range from December 10, 2012 to December 13, 2021 with a weighted average remaining contractual life of 5.9 years.

Upon exercise of stock options, the Company will issue new shares of its common shares. The Company does not hold any shares in treasury. The total intrinsic value of options exercised during 2011 and 2010 was $8,642 and $9,961, respectively. The aggregate intrinsic value of options exercisable as of December 31, 2011 was $1,534. The total options outstanding as of December 31, 2011 had no aggregate intrinsic value due to the fact that the weighted average exercise price exceeded the market value of the Company’s common stock. The total intrinsic value for options outstanding and options exercisable is calculated as the difference between the market value of the Company’s common stock as of December 31, 2011 and the exercise price of the shares. The market value of the Company’s common stock as of December 31, 2011 was $17.35 as reported by the Nasdaq Stock Market, LLC.

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This table summarizes information relating to all options outstanding and exercisable at December 31, 2011:

	Options Outstanding at December 31, 2011						Options Exercisable at December 31, 2011
Range of Exercise Prices (Per Share)	Number of Shares		Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Life (Years)		Number of Shares		Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Life (Years)
$14.05 – 14.71		5,285,000	$	14.65		5.28		3,296,000	$	14.66		4.24
14.78 – 17.35		5,179,000		15.30		6.00		2,642,000		14.84		2.17
17.65 – 19.28		6,560,000		18.33		6.33		3,165,000		18.32		6.37
19.53 – 23.86		5,375,000		22.75		6.13		2,562,000		21.55		3.00
27.03 – 32.49		4,644,000		30.88		5.46		15,000		27.03		5.00
		27,043,000						11,680,000

As of December 31, 2011 and 2010, there was $142,872 and $141,438, respectively, available in the pool of windfall tax benefits.

Employee Stock Purchase Plan

The Company has an employee stock purchase plan that provides for offerings of common stock to eligible employees at a price equal to 85 percent of the fair market value of the stock at the end of the stock purchase period, as defined. The Company has reserved 15,600,000 shares for issuance under this plan. At December 31, 2011, 11,474,000 cumulative shares have been issued. Costs incurred by the Company related to the employee stock purchase plan were immaterial in 2011, 2010 and 2009.

Common Stock Buyback

The Board of Directors, under multiple authorizations, has authorized the purchase of the Company’s common stock on the open market or through private transactions. As of January 31, 2012, the Company had approximately $95,823 of authorization remaining for the purchase of common stock. The following table provides the total number of shares repurchased and the related total costs in 2011, 2010 and 2009:

Year	Total Number of Shares Repurchased		Total Cost
2011		11,109,000	$	211,165
2010		5,814,000		120,982
2009		3,198,000		54,114

The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value.

Rights Agreement

In December 2008, the Company’s Board of Directors declared a dividend distribution pursuant to a Rights Agreement (the Rights Agreement) which became effective on January 6, 2009. The purpose of the Rights Agreement is to deter coercive or unfair takeover tactics and to prevent a person or group (an Acquiring Person) from acquiring control of the Company without offering a fair price to all shareholders. Under the Rights Agreement, all common shareholders receive one Right for each common share outstanding. Each Right entitles the registered holder to purchase from the Company

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a unit consisting of one twenty-thousandths of a share of Series A Junior Participating Preferred Shares, $.05 par value per share, or a combination of securities and assets of equivalent value, at a purchase price of $150.00 per unit, subject to adjustment. The Rights will become exercisable and trade separately from the common stock ten days following a public announcement that an Acquiring Person has beneficial ownership of more than 20 percent of the outstanding common stock of the Company or the commencement of a tender or exchange offer that would result in an Acquiring Person owning 20 percent or more of the outstanding common stock of the Company. Upon exercise, holders, other than an Acquiring Person, will have the right to purchase the common stock of the Company equal to twice the value of the exercise price of the Rights. In lieu of requiring payment of the purchase price upon exercise of the Rights following certain events, the Company may permit the holders simply to surrender the Rights, in which event they will be entitled to receive common shares and other property, as the case may be, with a value of 50 percent of what could be purchased by payment of the full purchase price. The Rights, which do not have voting rights, will expire on January 6, 2019, and may be redeemed by the Company any time until ten days following the announcement of an Acquiring Person at a price of $.01 per Right.

Cash Dividends

On May 25, 2011, the Board of Directors declared a cash dividend of $.12 per share on the Company’s common stock, which was paid on June 28, 2011, to shareholders of record on June 20, 2011. On December 13, 2011, the Board of Directors declared a cash dividend of $.15 per share on the Company’s common stock, which was paid on January 6, 2012, to shareholders of record on December 28, 2011.

The cash dividends declared in 2011, 2010, and 2009 were $48,558, $37,513, and $32,422, respectively. The Board of Directors has indicated its intention to declare future cash dividends on a semiannual basis.

Noncontrolling Interest

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Statements of Changes in Equity:

Year Ended December 31,	2011			2010			2009
Noncontrolling interest
Beginning balance	$	15,155		$	121,895		$	109,722
Net income attributable to noncontrolling interest		1,691			1,633			98,097
Foreign currency translation adjustments		(703	)		685			1,797
Deconsolidation of LSV		0			(65,522	)		0
Deconsolidation of LSV Employee Group		0			(43,536	)		0
Distributions to noncontrolling interests		0			0			(87,337	)
Other		0			0			(384	)
Ending balance	$	16,143		$	15,155		$	121,895

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Note 9 – Accumulated Comprehensive Income (Loss)

Comprehensive income consists of net income and other gains and losses affecting shareholders’ equity that are excluded from net income. For the Company, comprehensive income includes unrealized gains and losses on available for sale securities and foreign currency translation adjustments. The Company presents comprehensive income in its Consolidated Statements of Comprehensive Income. Components of Accumulated other comprehensive income (loss) consisted of:

	Foreign Currency Translation Adjustments			Unrealized Holding Gains (Losses) On Investments			Accumulated Other Comprehensive Income (Loss)
Total accumulated comprehensive loss at January 1, 2009	$	(9,787	)	$	(1,524	)	$	(11,311	)
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at January 1, 2009		3,148			0			3,148
Total accumulated comprehensive loss attributable to SEI Investments Company at January 1, 2009	$	(6,639	)	$	(1,524	)	$	(8,163	)
Total comprehensive income		8,734			2,484			11,218
Less: Total comprehensive income attributable to noncontrolling interest		(1,797	)		0			(1,797	)
Total comprehensive income attributable to SEI Investments Company	$	6,937		$	2,484		$	9,421
Total accumulated comprehensive income (loss) at December 31, 2009		(1,053	)		960			(93	)
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2009		1,351			0			1,351
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2009	$	298		$	960		$	1,258
Total comprehensive income		2,205			379			2,584
Less: Total comprehensive income attributable to noncontrolling interest		(685	)		0			(685	)
Total comprehensive income attributable to SEI Investments Company	$	1,520		$	379		$	1,899
Total accumulated comprehensive income at December 31, 2010		1,152			1,339			2,491
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2010		666			0			666
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2010	$	1,818		$	1,339		$	3,157

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Total comprehensive loss		(3,195	)		1,235		(1,960	)
Less: Total comprehensive loss attributable to noncontrolling interest		703			0		703
Total comprehensive loss attributable to SEI Investments Company	$	(2,492	)	$	1,235	$	(1,257	)
Total accumulated comprehensive income at December 31, 2011		(2,043	)		2,574		531
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011		1,369			0		1,369
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011	$	(674	)	$	2,574	$	1,900

Note 10 – Employee Benefit Plan:

The Company has a tax-qualified defined contribution plan (the Plan). The Plan provides retirement benefits, including provisions for early retirement and disability benefits, as well as a tax-deferred savings feature. After satisfying certain requirements, participants are vested in employer contributions at the time the contributions are made. All Company contributions are discretionary and are made from available profits. The Company contributed $4,783, $4,496, and $4,327 to the Plan in 2011, 2010, and 2009, respectively.

Note 11 – Commitments and Contingencies:

The Company leases certain of its facilities, data processing equipment, and software under non-cancelable operating leases, some which contain escalation clauses for increased taxes and operating expenses. The Company has entered into maintenance agreements primarily for its data processing equipment. Rent expense was $19,760, $17,210, and $19,022 in 2011, 2010, and 2009, respectively.

The aggregate noncancellable minimum commitments at December 31, 2011 are:

2012	$	17,892
2013		13,527
2014		6,997
2015		1,955
2016 and thereafter		10,419
	$	50,790

In the ordinary course of business, the Company from time to time enters into contracts containing indemnification obligations of the Company. These obligations may require the Company to make payments to another party upon the occurrence of certain events including the failure by the Company to meet its performance obligations under the contract. These contractual indemnification provisions are often standard contractual terms of the nature customarily found in the type of contracts entered into by the Company. In many cases, there are no stated or notional amounts included in the indemnification provisions. There are no amounts reflected on the Consolidated Balance Sheets as of December 31, 2011 and 2010 related to these indemnifications.

In the normal course of business, the Company is party to various claims and legal proceedings.

One of SEI’s principal subsidiaries, SIDCO, has been named as a defendant in certain putative class action complaints (the Complaints) related to leveraged exchange traded funds (ETFs) advised by ProShares Advisors, LLC. The first complaint was filed on August 5, 2009. To date, the Complaints have been filed in the United States District Court for the Southern District of New York and in the United States District Court for the District of Maryland. The three complaints filed in the District of Maryland have been voluntarily dismissed by the plaintiffs. Two of them were subsequently re-filed in the Southern District of New York. Two of the complaints filed in the Southern District of New York have also been voluntarily dismissed by plaintiffs. The Complaints are purportedly made on behalf of all persons that purchased or otherwise acquired shares in various ProShares leveraged ETFs pursuant or traceable to allegedly false and misleading registration statements, prospectuses and statements of additional information. The Complaints name as defendants ProShares Advisors, LLC; ProShares Trust; ProShares Trust II, SIDCO, and various officers and trustees to ProShares Advisors, LLC; ProShares Trust and ProShares Trust II. The Complaints allege that SIDCO was the distributor and principal underwriter for the various ProShares leveraged ETFs that were distributed to authorized participants and ultimately shareholders. The complaints allege that the registration statements for the ProShares ETFs were materially false and misleading because they failed adequately to describe the nature and risks of the investments. The Complaints allege that SIDCO is liable for these purportedly material misstatements and omissions under Section 11 of the Securities Act of 1933. The Complaints seek unspecified compensatory and other damages, reasonable costs and other relief. Defendants have moved to consolidate the complaints, which motion has been granted. The Court appointed lead plaintiff on July 13, 2010, and an amended consolidated class action complaint was filed on September 25, 2010 asserting substantially the same claims. Defendants moved to dismiss on November 15, 2010. On December 16, 2010, lead plaintiff informed the Court and Defendants that lead plaintiff elected to file a second amended consolidated complaint, which was filed on January 31, 2011. Defendants filed a motion to dismiss the second complaint on March 17, 2011. Oral argument on this motion was held on February 2, 2012. While the outcome of this litigation is uncertain given its early phase, SEI believes that it has valid defenses to plaintiffs’ claims and intends to defend the lawsuits vigorously.

SEI has been named in six lawsuits filed in Louisiana. Five lawsuits were filed in the 19th Judicial District Court for the Parish of East Baton Rouge, State of Louisiana. One of the five actions purports to set forth claims on behalf of a class and also names SPTC as a defendant. Two of the other actions also name SPTC as a defendant. All five actions name various defendants in addition to SEI, and, in all five actions, the plaintiffs purport to bring a cause of action under the Louisiana Securities Act. The putative class action originally included a claim against SEI and SPTC for an alleged violation of the Louisiana Unfair Trade Practices Act. Two of the other five actions include claims for violations of the Louisiana Racketeering Act and possibly conspiracy. In addition, another group of plaintiffs have filed a lawsuit in the 23rd Judicial District Court for the Parish of Ascension, State of Louisiana, against SEI and SPTC and other defendants asserting claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Securities Act and Louisiana Racketeering Act and conspiracy. The underlying allegations in all the actions are purportedly related to the role of SPTC in providing back-office services to Stanford Trust Company. The petitions allege that SEI and SPTC aided and abetted or otherwise participated in the sale of “certificates of deposit” issued by Stanford International Bank. Two of the five actions filed in East Baton Rouge have been removed to federal court, and plaintiffs’ motions to remand are pending. These two cases have been transferred by the Judicial Panel on Multidistrict Litigation to United States District Court for the Northern District of Texas. On August 31, 2011, the United States District Court for the Northern District of Texas issued an order and judgment that the causes of action alleged against SEI and SPTC in the two remanded actions were preempted by federal law and the Court dismissed these cases with prejudice. The Court of Appeals for the Fifth Circuit has granted an expedited appeal of the United States District Court’s order and judgment. The appeal has been fully briefed, and oral argument was held on February 7, 2012. The case filed in Ascension was also removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas. The schedule for responding to that complaint has not yet been established. The plaintiffs in the remaining two cases in East Baton Rouge have granted SEI an extension to respond to the filings. SEI and SPTC filed exceptions in the putative class action pending in East Baton Rouge, which the Court granted in part and dismissed the claims under the Louisiana Unfair Trade Practices Act and denied in part as to the other

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exceptions. SEI and SPTC filed an answer to the East Baton Rouge putative class action; plaintiffs filed a motion for class certification; and SEI and SPTC also filed a motion for summary judgment against certain named plaintiffs which the Court stated will not be set for hearing until after the hearing on the class certification motion. Following the decision by the United States District Court for the Northern District of Texas, the Court in the East Baton Rouge action issued an order staying the proceedings in the East Baton Rouge class action pending the outcome of the appeal of the order and judgment of the United States District Court for the Northern District of Texas. While the outcome of this litigation is uncertain given its early phase, SEI and SPTC believe that they have valid defenses to plaintiffs’ claims and intend to defend the lawsuits vigorously.

Because of the uncertainty of the make-up of the classes, the specific theories of liability that may survive a motion to dismiss, the lack of discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the foregoing lawsuits.

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Note 12 – Income Taxes:

The federal and state and foreign income tax provision is summarized as follows:

Year Ended December 31,	2011			2010		2009
Current
Federal	$	99,448		$	116,388	$	16,012
State		7,067			8,698		664
Foreign		4,603			3,365		5,412
		111,118			128,451		22,088
Deferred, including current deferred
Federal		(2,317	)		6,085		61,443
State		2,477			1,509		5,822
Foreign		6			0		0
		166			7,594		67,265
Income taxes attributable to the Noncontrolling interest (1)		553			416		533
Total income taxes	$	111,837		$	136,461	$	89,886

(1) There is no income tax provision for LSV due to its partnership structure.

Annual tax provisions include amounts considered sufficient to pay assessments that may result from examination of prior year tax returns; however, the amount ultimately paid upon resolution of issues raised may differ materially from the amount accrued. The examination and the resolution process may last longer than one year.

The components of Net income before income taxes are summarized as follows:

Year Ended December 31,	2011		2010		2009
Domestic	$	309,391	$	360,937	$	255,390
Foreign		6,852		6,795		8,300
	$	316,243	$	367,732	$	263,690

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The effective income tax rate differs from the federal income tax statutory rate due to the following:

Year Ended December 31,	2011			2010			2009
Statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of Federal tax benefit		2.0			2.0			1.5
Foreign tax expense and tax rate differential		0.6			0.4			1.1
Research and development tax credit		(0.7	)		(0.5	)		(0.8	)
Domestic Production Activities Deduction		(0.7	)		0			0
Domestic Production Activities Deduction, prior years, net		(1.5	)		0			0
Net change in uncertain tax positions(2)		0.4			0.2			(2.7	)
Other, net		0.1			(0.1	)		(0.2	)
		35.2	%		37.0	%		33.9	%

(2) For 2011, 0.25 percent relates to federal issues, 0.14 percent relates to state tax issues and the remaining 0.01 relates to foreign tax issues. For 2010, 0.14 percent relates to federal issues and the remaining 0.06 percent relates to state tax issues. For 2009, 2.0 percent relates to research and development tax credit settled with the Internal Revenue Service (IRS), 0.5 percent relates to federal issues settled with the IRS and the remaining 0.2 percent relates to state tax issues.

Undistributed earnings of the Company’s foreign subsidiaries amounted to approximately $61,194 at December 31, 2011. Those earnings are considered to be indefinitely reinvested and, accordingly, no U.S. federal and state income taxes have been provided thereon. Upon distribution of those earnings, in the form of dividends or otherwise, the Company would be subject to both U.S. income taxes, subject to an adjustment for foreign tax credits, and withholding taxes payable to the various foreign countries. Determination of the amount of unrecognized deferred U.S. income tax liability is not practicable because of the complexities associated with its hypothetical calculation, including the availability, or lack thereof, of foreign tax credits to reduce a portion of the U.S. liability.

Deferred income taxes for 2011, 2010, and 2009 reflect the impact of temporary differences between the amount of assets and liabilities for financial reporting purposes and such amounts as measured by tax laws and regulations. Principal items comprising the deferred income tax provision are:

Year Ended December 31,	2011			2010			2009
Difference in financial reporting and income tax depreciation methods	$	860		$	1,381		$	(86	)
Reserves not currently deductible		651			774			394
Reserves for Capital Support Agreements and basis difference in SIV securities		(3,336	)		4,822			60,491
Capitalized software currently deductible for tax purposes, net of amortization		5,157			5,734			2,876
State deferred income taxes		1,300			1,519			2,394
Revenue and expense recognized in different periods for financial reporting and income tax purposes		(1,188	)		(562	)		(122	)
Stock-based compensation expense		(3,101	)		(7,457	)		(4,386	)
Uncertain tax positions		(182	)		(106	)		2,861
Other, net		5			1,489			2,843
	$	166		$	7,594		$	67,265

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The net deferred income tax liability is comprised of:

Year Ended December 31,	2011			2010
Current deferred income taxes:
Gross assets	$	1,151		$	1,388
Gross liabilities		(1	)		(1	)
		1,150			1,387
Valuation allowance		0			0
		1,150			1,387
Long-term deferred income taxes:
Gross assets		63,374			59,892
Gross liabilities		(148,540	)		(143,137	)
		(85,166	)		(83,245	)
Valuation allowance		(8,585	)		(9,008	)
		(93,751	)		(92,253	)
Net deferred income tax liability	$	(92,601	)	$	(90,866	)

The valuation allowances against deferred tax assets at December 31, 2011 and 2010 are related to state net operating losses from certain domestic subsidiaries. Certain state tax statutes significantly limit the utilization of net operating losses for domestic subsidiaries. Furthermore, these net operating losses cannot be used to offset the net income of other subsidiaries. As of December 31, 2010, the Company fully utilized its capital loss carryforward in the amount of $4,256.

The tax effect of significant temporary differences representing deferred tax liabilities is:

Year Ended December 31,	2011			2010
Difference in financial reporting and income tax depreciation methods	$	(13,600	)	$	(11,402	)
Reserves not currently deductible		374			472
Capitalized software currently deductible for tax purposes, net of amortization		(139,455	)		(132,030	)
State deferred income taxes		6,717			5,337
Revenue and expense recognized in different periods for financial reporting and income tax purposes		3,149			3,015
Unrealized holding loss (gain) on investments		(927	)		(5,292	)
Stock-based compensation expense		43,879			40,096
State net operating loss carryforward		14,485			16,634
Valuation allowance on deferred tax assets		(8,585	)		(9,008	)
Federal benefit of state tax deduction for uncertain tax positions		1,725			1,542
Other, net		(363	)		(230	)
Net deferred income tax liability	$	(92,601	)	$	(90,866	)

The Company recognizes tax liabilities in accordance with the applicable accounting guidance and adjusts these liabilities when management’s judgment changes as a result of the evaluation of new information not previously available. Due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different than from our current estimate of the tax liabilities. The Company’s total unrecognized tax benefit, not including interest and penalties, as of December 31, 2011 was $9,410, of which $8,320 would affect the effective tax rate if the Company were to recognize the tax benefit. The gross amount of uncertain tax liability of $1,768

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which is expected to be paid within one year is included in Current liabilities while the remaining amount of $8,276 is included in Other long-term liabilities on the accompanying Consolidated Balance Sheets. During the year ended December 31, 2011, the Company recognized $697 of previously unrecognized tax benefits relating to the lapse of the statute of limitation for certain state filings.

The Company files a consolidated federal income tax return and separate income tax returns with various states. Certain subsidiaries of the Company file tax returns in foreign jurisdictions. The Company is no longer subject to U.S. federal income tax examination for years before 2008 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2006.

A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:

	2011			2010			2009
Balance as of January 1	$	5,723		$	4,989		$	13,453
Tax positions related to current year:
Gross additions		2,392			1,372			1,905
Gross reductions		0			0			0
		2,392			1,372			1,905
Tax positions related to prior years:
Gross additions		1,992			0			0
Gross reductions		0			(104	)		0
		1,992			(104	)		0
Settlements		0			(102	)		(9,888	)
Lapses on statute of limitations		(697	)		(432	)		(481	)
Balance as of December 31	$	9,410		$	5,723		$	4,989

The above reconciliation of the gross unrecognized tax benefit will differ from the amount which would affect the effective tax rate because of the recognition of the federal and state tax benefits.

The Company classifies all interest and penalties as income tax expense. The Company has recorded $634, $690 and $864 in liabilities for tax related interest and penalties in 2011, 2010, and 2009, respectively.

The Company estimates it will recognize $1,768 of unrecognized tax benefits within the next twelve months due to lapses on the statute of limitation.

The Company includes its direct and indirect subsidiaries in its U.S. consolidated federal income tax return. The Company’s tax sharing allocation agreement provides that any subsidiary having taxable income will pay a tax liability equivalent to what that subsidiary would have paid if it filed a separate income tax return. If the separately calculated federal income tax provision for any subsidiary results in a tax loss, the current benefit resulting from such loss, to the extent utilizable on a separate return basis, is accrued and paid to that subsidiary.

Note 13 – Business Segment Information:

The Company’s reportable business segments are:

Private Banks – provides investment processing and investment management programs to banks and trust institutions worldwide, independent wealth advisers located in the United Kingdom, and financial advisors in Canada;

Investment Advisors – provides investment management programs to affluent investors through a network of independent registered investment advisors, financial planners, and other investment professionals in the United States;

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Institutional Investors – provides investment management programs and administrative outsourcing solutions to retirement plan sponsors, hospitals, and not-for-profit organizations worldwide;

Investment Managers – provides investment operations outsourcing solutions to investment managers, fund companies and banking institutions located in the United States, and to investment managers worldwide of alternative asset classes such as hedge funds, funds of hedge funds, and private equity funds across both registered and partnership structures; and

Investments in New Businesses – provides investment management programs to ultra-high-net-worth families residing in the United States through the SEI Wealth Network® and conducts other research and development activities.

In January 2010, the Company deconsolidated the assets, liabilities and operations of LSV Asset Management. As a result, LSV is no longer considered a reportable business segment beginning in 2010.

In 2011 and 2010, no single customer accounted for more than ten percent of revenues in any business segment.

The following tables highlight certain financial information about each of the Company’s business segments for the years ended December 31, 2011, 2010, and 2009:

2011

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
Revenues	$	348,122		$	189,780		$	210,027		$	177,975		$	3,823		$	929,727
Expenses		339,339			110,438			106,585			115,963			11,559			683,884
Operating profit (loss)	$	8,783		$	79,342		$	103,442		$	62,012		$	(7,736	)	$	245,843
Profit margin		3	%		42	%		49	%		35	%		N/A			26	%

2010

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
Revenues	$	346,668		$	183,378		$	206,531		$	160,159		$	4,099		$	900,835
Expenses		310,633			110,388			106,934			103,421			12,676			644,052
Operating profit (loss)	$	36,035		$	72,990		$	99,597		$	56,738		$	(8,577	)	$	256,783
Profit margin		10	%		40	%		48	%		35	%		N/A			29	%

2009

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			LSV			Total
Revenues	$	361,273		$	166,097		$	177,721		$	139,004		$	4,492		$	211,961		$	1,060,548
Expenses (1)		309,300			109,418			99,924			93,074			11,625			136,580			759,921
Operating profit (loss)	$	51,973		$	56,679		$	77,797		$	45,930		$	(7,133	)	$	75,381		$	300,627
Profit margin		14	%		34	%		44	%		33	%		N/A			36	%		28	%

(1) For the year ended December 31, 2009, LSV includes $105,471 of noncontrolling interest of the other partners of LSV.

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A reconciliation of the total reported for the business segments to income from operations in the Consolidated Statements of Operations for the years ended December 31, 2011, 2010, and 2009 is as follows:

Year Ended December 31,	2011			2010			2009
Total operating profit from segments above	$	245,843		$	256,783		$	300,627
Corporate overhead expenses		(43,398	)		(40,715	)		(36,529	)
Noncontrolling interest reflected in segments		1,620			1,465			106,905
LSV Employee Group expenses (2)		0			0			(7,296	)
Income from operations	$	204,065		$	217,533		$	363,707

(2) Includes $7,222 in 2009 of amortization expense related to intangible assets.

The following tables provide additional information for the years ended December 31, 2011, 2010, and 2009 pertaining to our business segments:

	Capital Expenditures						Depreciation
Year Ended December 31,	2011		2010		2009		2011		2010		2009
Private Banks	$	35,045	$	32,982	$	39,364	$	15,648	$	15,704	$	15,415
Investment Advisors		11,933		11,691		13,607		2,251		2,384		2,286
Institutional Investors		2,059		2,601		2,665		1,079		1,170		1,108
Investment Managers		3,081		3,659		4,306		1,809		1,891		1,580
Investments in New Businesses		577		608		831		114		148		176
LSV		0		0		1,358		0		0		395
Total from business segments	$	52,695	$	51,541	$	62,131	$	20,901	$	21,297	$	20,960
Corporate Overhead		530		799		1,085		570		605		571
	$	53,225	$	52,340	$	63,216	$	21,471	$	21,902	$	21,531

	Amortization
Year Ended December 31,	2011		2010		2009
Private Banks	$	18,081	$	15,100	$	24,058
Investment Advisors		6,201		5,467		8,550
Institutional Investors		864		1,213		927
Investment Managers		580		820		688
Investments in New Businesses		433		477		1,897
LSV		0		0		436
Total from business segments	$	26,159	$	23,077	$	36,556
LSV Employee Group		0		0		7,280
Corporate Overhead		1,129		971		772
	$	27,288	$	24,048	$	44,608

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	Total Assets
	2011		2010
Private Banks	$	457,333	$	460,261
Investment Advisors		119,053		113,111
Institutional Investors		80,133		72,867
Investment Managers		95,760		96,378
Investments in New Businesses		5,962		6,801
Total from business segments	$	758,241	$	749,418
Corporate Overhead (3)		536,318		627,805
	$	1,294,559	$	1,377,223

(3) Unallocated assets primarily consist of cash and cash equivalents, marketable securities, and certain other shared services assets.

The following table presents revenues based on the location of the use of the products or services:

For the Year Ended December 31,	2011		2010		2009
United States	$	785,506	$	767,068	$	950,891
International operations		144,221		133,767		109,657
	$	929,727	$	900,835	$	1,060,548

The following table presents assets based on their location:

	2011		2010
United States	$	1,098,643	$	1,193,775
International operations		195,916		183,448
	$	1,294,559	$	1,377,223

Note 14 – Related Party Transactions:

The Company, either by itself or through its wholly-owned subsidiaries, is a party to Investment Advisory and Administration Agreements with regulated investment companies (RICs) and other investment products which are administered by the Company. These investment products are offered to clients of the Company and its subsidiaries. Under the Investment Advisory and Administration Agreements, the Company receives a fee for providing investment advisory, administrative, and accounting services. The investment advisory and administration fee is a fixed percentage, referred to as basis points, of the average daily net assets, subject to certain limitations. Investment advisory and administration fees received by the Company totaled $364,602, $354,341 and $334,084 in 2011, 2010 and 2009, respectively. The Company is also a party to various agreements with several RICs which are advised and/or administered by the Company. The Company receives a fee for providing shareholder, administrative and distribution services pursuant to the provisions of various shareholder service, administrative service, and distribution plans adopted by the RICs. These fees totaled $39,017, $36,007 and $33,008 in 2011, 2010 and 2009, respectively. A portion of the transaction costs incurred by the RICs for securities transactions are directed to the Company’s broker-dealer subsidiary in its capacity as an introducing broker-dealer. The Company recognized $2,772, $4,875 and $4,300 in commissions during 2011, 2010 and 2009, respectively.

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Note 15 – Quarterly Financial Data (Unaudited):

	For the Three Months Ended
2011	March 31			June 30			Sept. 30			Dec. 31
Revenues	$	232,493		$	237,760		$	233,227		$	226,247
Income before income taxes	$	92,164		$	82,820		$	74,900		$	68,603
Net income attributable to SEI	$	57,728		$	53,603		$	49,232		$	44,396
Basic earnings per share	$	.31		$	.29		$	.27		$	.25
Diluted earnings per share	$	.31		$	.29		$	.27		$	.25
Effective income tax rate		37.1	%		34.7	%		33.8	%		34.7	%
Total SIV-related gains (losses)	$	6,864		$	(1,944	)	$	(792	)	$	(738	)
Diluted earnings per share (1)	$	.02		$	.01		$	.00		$	.00

(1) Attributable to SIV-related gains (losses).

	For the Three Months Ended
2010	March 31			June 30			Sept. 30			Dec. 31
Revenues	$	221,535		$	228,388		$	219,513		$	231,399
Income before income taxes	$	96,127		$	86,442		$	91,032		$	96,180
Net income attributable to SEI	$	59,420		$	53,478		$	56,389		$	62,400
Basic earnings per share	$	.31		$	.28		$	.30		$	.33
Diluted earnings per share	$	.31		$	.28		$	.30		$	.33
Effective income tax rate		37.9	%		37.8	%		37.8	%		37.0	%
Total SIV-related gains (losses)	$	17,349		$	3,913		$	8,728		$	14,257
Diluted earnings per share (2)	$	.06		$	.01		$	.03		$	.05

(2) Attributable to SIV-related gains.

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SEI INVESTMENTS COMPANY AND SUBSIDIARIES

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

FOR THE THREE YEARS ENDED DECEMBER 31, 2011, 2010, AND 2009

			Additions
Description	Balance at Beginning of Year		Charged to Costs and Expenses			Charged to Other Accounts		(Deductions)			Balance at End of Year
Allowance for doubtful accounts:
2011	$	1,195	$	0		$	0	$	(271	)	$	924
2010		3,348		0			0		(2,153	)		1,195
2009		2,656		692			0		0			3,348
Deferred income tax valuation allowance:
2011	$	9,008	$	(423	)	$	0	$	0		$	8,585
2010		6,217		1,443			1,348		0			9,008
2009		13,897		(32	)		0		(7,648	)		6,217

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Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our disclosure controls and procedures, as such term is defined under Rule 13a-15(e) promulgated under the Securities Exchange Act of 1934, as amended (the Exchange Act), as of the end of the period covered by this report. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures are effective as of the end of the period covered by this annual report to provide reasonable assurance that the information required to be disclosed by us in reports filed under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by an issuer in the reports that it files or submits under the Act is accumulated and communicated to the issuer’s management including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework in Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on our evaluation under the framework in Internal Control – Integrated Framework, our management concluded that our internal control over financial reporting was effective as of December 31, 2011.

The effectiveness of our internal control over financial reporting as of December 31, 2011 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which is included herein.

Changes in Internal Control over Financial Reporting

No change in our internal control over financial reporting occurred during the quarter ended December 31, 2011 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Item 9B. Other Information.

None.

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PART III

Item 10. Directors, Executive Officers and Corporate Governance.

Identification of Directors

Information with respect to the members of the Board of Directors of the Company is set forth under the caption “Election of Directors” in the Company’s definitive proxy statement to be filed pursuant to Regulation 14A, which information is incorporated herein by reference.

Identification of Executive Officers

The Board of Directors of the Company has determined that the Company’s executive officers within the meaning of Rule 3b-7 promulgated under the Securities Exchange Act of 1934, as amended, are as follows:

ALFRED P. WEST, JR., 69, has been the Chairman of the Board of Directors and Chief Executive Officer of the Company since its inception in 1968. Mr. West was President from June 1979 to August 1990.

KEVIN P. BARR, 46, has been an employee of the Company since May 2000. Mr. Barr has been an Executive Vice President since May 2008.

KATHY C. HEILIG, 53, has been an employee of the Company since November 1987. Ms. Heilig has been Chief Accounting Officer and Controller since May 1999. Ms. Heilig was Treasurer from May 1997 to May 2005.

N. JEFFREY KLAUDER, 59, has been Executive Vice President and General Counsel of the Company since August 2004. Prior to August 2004, Mr. Klauder was a partner of Morgan Lewis & Bockius, LLP, a law firm.

EDWARD D. LOUGHLIN, 61, has been an employee of the Company since September 1979. Mr. Loughlin has been an Executive Vice President since May 1993 and a Senior Vice President since January 1988.

DENNIS J. MCGONIGLE, 51, has been an employee of the Company since August 1985. Mr. McGonigle has been the Chief Financial Officer since December 2002 and an Executive Vice President since July 1996 and a Senior Vice President since May 1995.

STEPHEN G. MEYER, 47, has been an employee of the Company since November 1992. Mr. Meyer has been an Executive Vice President since December 2006 and a Senior Vice President since December 2005.

JOSEPH P. UJOBAI, 50, has been an employee of the Company since May 1998. Mr. Ujobai has been an Executive Vice President since May 2003 and a Senior Vice President since January 2001.

WAYNE M. WITHROW, 56, has been an employee of the Company since January 1990. Mr. Withrow has been an Executive Vice President since March 2000 and a Senior Vice President since January 1994. Mr. Withrow was Chief Information Officer from March 2000 to May 2002.

Section 16(a) Beneficial Ownership Reporting Compliance

Information with respect to the Section 16(a) compliance of the directors and executive officers of the Company is set forth under the caption “Section 16(a) Beneficial Ownership Reporting Compliance” in the Company’s definitive proxy statement to be filed pursuant to Regulation 14A, which information is incorporated herein by reference.

Code of Conduct

The Company has adopted a Code of Conduct applicable to all of its employees, including its executive officers, as well as a Code of Ethics for Senior Financial Officers. The Code of Conduct and the Code of Ethics for Senior Financial Officers is posted on our website, www.seic.com under the Corporate Governance section.

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Item 11. Executive Compensation.

Information required by this item is set forth under the caption “Executive Compensation” in the Company’s definitive proxy statement to be filed pursuant to Regulation 14A, which information is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Information required by this item is set forth under the caption “Ownership of Shares” in the Company’s definitive proxy statement to be filed pursuant to Regulation 14A, which information is incorporated herein by reference.

The following table provides information regarding the aggregate number of securities to be issued under all of our equity compensation plans upon exercise of outstanding options, warrants, and other rights and their weighted-average exercise price as of December 31, 2011. Material features of each of the plans reflected in the table are described below.

	Number of securities to be issued upon exercise of outstanding options, warrants and rights (a)		Weighted –average exercise price of outstanding options, warrants and rights (b)		Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (c)
Equity compensation plans approved by security holders (1)		27,043,291	$	20.06		4,621,878
Equity compensation plans not approved by security holders		0		0		0
Total		27,043,291	$	20.06		4,621,878

(1) Consists of: (i) the 2007 Equity Compensation Plan, and (ii) the Amended and Restated 1998 Equity Compensation Plan.

The 2007 Equity Compensation Plan:

On April 3, 2007, the Board of Directors adopted the 2007 Equity Compensation Plan (the 2007 Plan), and the Company’s shareholders approved the adoption of the 2007 Plan on May 23, 2007. The 2007 Plan provides for grants of stock options (incentive stock options and nonqualified stock options) and stock appreciation rights (SARs) to all employees (including employees who are also directors) of the Company or its subsidiaries, consultants and advisors who perform valuable services to the Company or its subsidiaries and members of the Board of Directors who are not employees of the Company. The Company has not granted any incentive stock options or stock appreciation rights under the 2007 Plan.

The 2007 Plan is administered and interpreted by the Compensation Committee; however, the Board of Directors or its delegate will make grants under the 2007 Plan to non-employee directors. The Compensation Committee has the authority to (i) determine the individuals to whom grants will be made under the 2007 Plan, (ii) determine the type, size and terms of the grants, (iii) determine the time when grants will be made and the duration of any applicable exercise or restriction period, including the exercisability and the acceleration of exercisability, (iv) amend the terms of any previously issued grant, (v) adopt guidelines separate for the 2007 Plan that set forth the specific terms and conditions for grants under the 2007 Plan, and (vi) deal with any other matters arising under the 2007 Plan.

Options granted under the 2007 Plan may be “incentive stock options,” which are intended to qualify within the meaning of Section 422 of the Internal Revenue Code, and “nonqualified stock options” which are not intended to so qualify. Options are granted under the 2007 Plan with an exercise price equal to or greater than the fair market value of the Company’s common stock on the date of grant and the term of may not exceed ten years from the date of grant. The vesting period for options commences on the date of grant, or upon the achievement of such vesting requirements, and ends on such date as is determined in each case by the

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Compensation Committee, in its sole discretion, which is specified in the grant letter. Options may be exercised only while the participant is actively employed by or actively providing service to the Company unless the Compensation Committee provides for a period after such employment or service in which the option may be exercised.

The Compensation Committee may grant SARs to anyone eligible to participate in the 2007 Plan. Upon exercise of a SAR, the participant will receive an amount equal to the excess of the fair market value of the Company’s common stock on the date of exercise over the base amount set forth in the grant letter. Such payment to the participant will be in cash, in shares of common stock, or in a combination of cash and shares of common stock. The Compensation Committee will determine the period when SARs vest and become exercisable, the base amount of the SARs, and whether SARs will be granted in connection with, or independently of, any options. SARs may be exercised only while the participant is actively employed by or actively providing service to the Company unless the Compensation Committee provides for a period after such employment or service in which the option may be exercised.

If there is any change in the number or kind of shares of common stock outstanding by reason of a stock dividend, spin-off, recapitalization, stock split, or combination or exchange of shares, by reason of a merger, reorganization or consolidation, by reason of a recapitalization or change in par value or by reason of any other extraordinary or unusual event affecting the outstanding common stock as a class without the Company’s receipt of consideration, or if the value of outstanding shares of common stock is substantially reduced as a result of a spin-off or the Company’s payment of an extraordinary dividend or distribution, the maximum number of shares of common stock available for issuance under the 2007 Plan, the maximum number of shares of common stock which any individual may receive pursuant to grants in any year, the kind and number of shares covered by outstanding grants, the kind and number of shares issued and to be issued under the 2007 Plan, and the price per share or the applicable market value of such grants shall be appropriately adjusted by the Compensation Committee, in such manner as the Compensation Committee deems appropriate, to reflect any increase or decrease in the number of, or change in the kind or value of, the issued shares of common stock to preclude, to the extent practicable, the enlargement or dilution of rights and benefits under the 2007 Plan and such outstanding grants.

In the event of a change in control, the Compensation Committee may take any of the following actions with respect to outstanding grants: (i) determine that outstanding options and SARs will be fully exercisable as of the date of the change in control or at such other time as the Compensation Committee determines, (ii) require that participants surrender their options and SARs in exchange for payment by the Company, in cash or shares of common stock as determined by the Compensation Committee, in an amount equal to the amount by which the then-fair market value subject to the participant’s unexercised options and SARs exceeds the exercise price of the option or the base amount of the SAR, as applicable, (iii) after giving participants the opportunity to exercise their options and SARs, the Compensation Committee may terminate any or all unexercised options and SARs at such time as the Compensation Committee determines appropriate, or (iv) determine that grants that remain outstanding after the change in control will be converted to similar grants of the surviving corporation.

The Board of Directors may amend or terminate the 2007 Plan at any time, subject to shareholder approval. No grants may be issued under the 2007 Plan after June 1, 2017.

As of December 31, 2011, options to acquire 14,977,746 shares were outstanding under the 2007 Plan, out of a total of 20,000,000 shares of common stock reserved for issuance under the 2007 Plan. A total of 4,621,878 shares of common stock remain available for issuance under the 2007 Plan for future grants.

The 1998 Equity Compensation Plan:

On May 21, 1998, the Board of Directors adopted the 1998 Equity Compensation Plan (the 1998 Plan), and the Company’s shareholders approved the adoption of the 1998 Plan. The Board of Directors had made certain amendments to the 1998 Plan after its adoption that did not require shareholder approval. The 1998 Plan was most recently amended and restated in May 2003. The 1998 Plan provided for grants of stock options (incentive stock options and nonqualified stock options), stock appreciation rights, restricted stock and performance units to all employees (including employees who were also directors) of the Company or its subsidiaries, consultants and advisors who performed valuable services to the Company or its subsidiaries and members of the Board of Directors who were not employees of the Company. The Company did not grant any incentive stock options, stock appreciation rights, restricted stock or performance units under the 1998 Plan. The 1998 Plan was terminated by the Board of Directors in April 2007, and no further options, stock appreciation rights, restricted stock and performance units may be granted. However, options granted under the 1998 Plan prior to its termination continue in effect under the terms of the grant and the 1998 Plan.

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All options that were granted under the 1998 Plan to employees and consultants were granted at the fair market value of the Company’s common stock on the date of grant, become exercisable ratably upon the attainment of specific diluted earnings per share targets or in their entirety after seven years from the date of grant (for grants prior to 2006), and expire ten years from the date of grant.

The 1998 Plan provided that non-employee members of the Board of Directors would receive automatic grants of nonqualified stock options. Each non-employee director who first became a member of the Board of Directors after the effective date of the 1998 Plan, but before the termination of the 1998 Plan, received a non-qualified stock option to purchase 8,000 shares. In addition, each non-employee director received a non-qualified stock option to purchase 4,000 shares pursuant to the 1998 Plan. The exercise prices for these options were equal to the fair market value of the Company’s stock on the date of grant, the term is ten years from the date of grant, and the options became exercisable ratably over the first four anniversaries of the date of grant (unless otherwise determined by the Compensation Committee).

If the Company is consolidated or merged into another corporation, each optionee with an outstanding option under the 1998 Plan will receive, upon exercise of the option, the same consideration as other shareholders of the Company received in connection with the transaction. If all or substantially all of the assets of the Company are sold or exchanged (other than by merger or consolidation), each optionee will have the right to exercise the option in full within ten days after the Compensation Committee provides notice of the right to exercise the option, and any portion of the option not exercised will lapse.

As of December 31, 2011, options to acquire 12,065,545 shares were outstanding under the 1998 Plan, out of a total of 40,444,000 shares of common stock reserved for issuance under the 1998 Plan.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

Information required by this item is set forth under the captions “Election of Directors,” “Executive Compensation,” and “Director Compensation” in the Company’s definitive proxy statement to be filed pursuant to Regulation 14A, which information is incorporated herein by reference.

Item 14. Principal Accounting Fees and Services.

Information required by this item is set forth under the caption “Ratification or Appointment of Independent Public Accountants” in the Company’s definitive proxy statement to be filed pursuant to Regulation 14A, which information is incorporated herein by reference.

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PART IV

Item 15. Exhibits, Financial Statement Schedules.

1 and 2.	Financial Statements and Financial Statement Schedules. The following is a list of the Consolidated Financial Statements of the Company and its subsidiaries and supplementary data filed as part of Item 8 hereof:
	Report of Independent Registered Public Accounting Firm
	Consolidated Balance Sheets — December 31, 2011 and 2010
	Consolidated Statements of Operations — For the years ended December 31, 2011, 2010, and 2009
	Consolidated Statements of Comprehensive Income — For the years ended December 31, 2011, 2010, and 2009
	Consolidated Statements of Changes in Equity — For the years ended December 31, 2011, 2010, and 2009
	Consolidated Statements of Cash Flows — For the years ended December 31, 2011, 2010, and 2009
	Notes to Consolidated Financial Statements
	Schedule II — Valuation and Qualifying Accounts and Reserves — For the years ended December 31, 2011, 2010, and 2009
	All other schedules are omitted because they are not applicable, or not required, or because the required information is included in the Consolidated Financial Statements or notes thereto.
3.	Exhibits, Including Those Incorporated by Reference. The exhibits to this Report are listed on the accompanying index to exhibits and are incorporated herein by reference or are filed as part of this Annual Report on Form 10-K.

Page 85 of 88

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		SEI INVESTMENTS COMPANY
Date	February 27, 2012	By	/s/ Dennis J. McGonigle
			Dennis J. McGonigle
			Chief Financial Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on dates indicated.

Date	February 27, 2012	By	/s/ Alfred P. West, Jr.
			Alfred P. West, Jr.
			Chairman of the Board,
			Chief Executive Officer,
			and Director
Date	February 27, 2012	By	/s/ Carmen V. Romeo
			Carmen V. Romeo
			Director
Date	February 27, 2012	By	/s/ Richard B. Lieb
			Richard B. Lieb
			Director
Date	February 27, 2012	By	/s/ William M. Doran
			William M. Doran
			Director
Date	February 27, 2012	By	/s/ Kathryn M. McCarthy
			Kathryn M. McCarthy
			Director
Date	February 27, 2012	By	/s/ Sarah W. Blumenstein
			Sarah W. Blumenstein
			Director

Page 86 of 88

EXHIBIT INDEX

The following is a list of exhibits filed as part of this annual report on Form 10-K. For exhibits incorporated by reference, the location of the exhibit in the previous filing is indicated in parentheses.

3.1	Articles of Incorporation of the Registrant as amended on January 21, 1983. (Incorporated by reference to exhibit 3.1 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 1982.)
3.1.2	Amendment to Articles of Incorporation of the Registrant, dated May 21, 1992. (Incorporated by reference to exhibit 3.1.2 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 1992.)
3.1.3	Amendment to Articles of Incorporation of the Registrant, dated May 26, 1994. (Incorporated by reference to exhibit 3.1.3 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 1994.)
3.1.4	Amendment to Articles of Incorporation of the Registrant, dated November 21, 1996. (Incorporated by reference to exhibit 3.1.4 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 1996.)
3.1.5	Amendment to Articles of Incorporation of the Registrant, dated February 14, 2001. (Incorporated by reference to exhibit 3.1.4 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2000.)
3.2	Amended and Restated By-Laws. (Incorporated by reference to exhibit 3.2 to the Registrant’s Current Report on Form 8-K dated January 6, 2009.)
3.2.1	Amendment of Section 3.02 of the Amended and Restated Bylaws. (Incorporated by reference to exhibit 3.2.1 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2010.)
4.1	Rights Agreement dated January 6, 2009. (Incorporated by reference to exhibit 4.1 to the Registrant’s Current Report on Form 8-K dated January 6, 2009.)
4.2	Statement with Respect to Shares of a Domestic Corporation amending the designations of Series A Junior Participating Preferred Shares as a series of the Series Preferred Stock of the Company, dated January 6, 2009. (Incorporated by reference to exhibit 4.1 to the Registrant’s Current Report on Form 8-K dated January 6, 2009.)
	Note: Exhibits 10.4 through 10.11 constitute the management contracts and executive compensatory plans or arrangements in which certain of the directors and executive officers of the Registrant participate.
10.4	1998 Equity Compensation Plan, Amended and Restated as of April 8, 2003. (Incorporated by reference to exhibit 99.1 to the Registrant’s Registration Statement on Form S-8 (No. 333-111224) filed December 16, 2003.)
10.4.1	Amendment 2006-1 to the 1998 Equity Compensation Plan, Amended and Restated as of April 8, 2003. (Incorporated by reference to exhibit 10.4.1 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2006.)
10.5	Employee Stock Purchase Plan as Amended and Restated on May 20, 2008. (Incorporated by reference to the Registrant’s Current Report on Form 8-K dated May 20, 2008.)
10.6	SEI Capital Accumulation Plan. (Incorporated by reference to exhibit 99(e) to the Registrant’s Registration Statement on Form S-8 (No. 333-41343) filed December 2, 1997.)
10.9	Employment Agreement, dated June 25, 2004, between N. Jeffrey Klauder and the Registrant. (Incorporated by reference to exhibit 10.9 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2006.)
10.10	2007 Equity Compensation Plan. (Incorporated by reference to exhibit 10.10 to the Registrant’s Current Report on Form 8-K dated April 11, 2007.)
10.21	Guaranty and Collateral Agreement, dated as of January 24, 2006 by and among SEI Investments Company, LSV Employee Group, LLC, the Grantors party thereto and LaSalle Bank National Association as Administrative Agent (including the underlying Credit Agreement dated as of January 24, 2006 by and among LSV Employee Group, LLC, LSV Asset Management, the Lenders party thereto and LaSalle Bank National Association as Administrative Agent to which the Guaranty and Collateral Agreement relates). (Incorporated by reference to exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated January 30, 2006.)
10.21.1	Third Amendment to Credit Agreement dated as of January 18, 2011 by and among LSV Employee Group, LLC, LSV Asset Management, and Bank of America, N.A. (Incorporated by reference to exhibit 10.21.1 to the Registrant’s Current Report on Form 8-K dated January 18, 2011.)

Page 87 of 88

10.22	Credit Facility, dated January 14, 2003 between Royal Bank of Canada and SEI Investments Canada Company, a subsidiary of SEI Investments Company. (Incorporated by reference to exhibit 10.22 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005.)
10.22.1	First Amendment, dated June 15, 2005 to Credit Facility, dated January 14, 2003 between Royal Bank of Canada and SEI Investments Canada Company, a subsidiary of SEI Investments Company. (Incorporated by reference to exhibit 10.22.1 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005.)
10.22.2	Second Amendment, dated February 20, 2006 to Credit Facility, dated January 14, 2003 between Royal Bank of Canada and SEI Investments Canada Company, a subsidiary of SEI Investments Company. (Incorporated by reference to exhibit 10.22.2 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005.)
10.23	$200,000 Credit Agreement, dated July 25, 2007, among SEI Investments Company, the Lenders Party thereto, JPMorgan Chase Bank, N.A., Wachovia Bank, National Association, Bank of America, N.A., Manufacturers and Traders Trust Company and PNC Bank, National Association. (Incorporated by reference to exhibit 99.2 to the Registrant’s Current Report on Form 8-K dated July 24, 2007.)
10.23.1	First Amendment, dated November 7, 2007, to $200,000 Credit Agreement, dated July 25, 2007. (Incorporated by reference to exhibit 10.3 to the Registrant’s Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2007.)
10.23.2	Second Amendment, dated March 19, 2008, to $200,000 Credit Agreement, dated July 25, 2007. (Incorporated by reference to exhibit 10.23.2 to the Registrant’s Current Report on Form 8-K dated March 19, 2008.)
10.23.3	Third Amendment, dated November 5, 2008, to $200,000 Credit Agreement, dated July 25, 2007. (Incorporated by reference to exhibit 10.23.3 to the Registrant’s Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2008.)
10.23.4	Fourth Amendment, dated November 26, 2008, to $200,000 Credit Agreement, dated July 25, 2007. (Incorporated by reference to exhibit 10.23.4 to the Registrant’s Current Report on Form 8-K dated November 26, 2008.)
10.24	$300,000 Credit Agreement, dated February 2, 2012, among SEI Investments Company, the Lenders Party thereto, U.S. Bank National Association, as Syndication Agent, Citizens Bank of Pennsylvania and Manufacturers and Traders Trust Company, each as Documentation Agent, and Wells Fargo Bank, National Association, as Administrative Agent (Incorporated by reference to exhibit 10.24 to the Registrant’s Current Report on Form 8-K dated February 2, 2012.)
14	Code of Ethics for Senior Financial Officers. (Incorporated by reference to exhibit 14 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2003.)
21*	Subsidiaries of the Registrant.
23.1*	Consent of Independent Registered Public Accounting Firm.
23.2*	Consent of Independent Registered Public Accounting Firm relating to the financial statements of LSV Asset Management.
31.1*	Rule 13a-15(e)/15d-15(e) Certification of Chief Executive Officer.
31.2*	Rule 13a-15(e)/15d-15(e) Certification of Chief Financial Officer.
32*	Section 1350 Certifications.
99	Financial Statements of LSV Asset Management dated December 31, 2005 and 2004. (Incorporated by reference to exhibit 99.1 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005.)
99.1	Financial Statements of LSV Asset Management dated December 31, 2010 and 2009. (Incorporated by reference to exhibit 99.1 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2010.)
99.2*	Financial Statements of LSV Asset Management dated December 31, 2011 and 2010.
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document

* Filed herewith as an exhibit to this Annual Report on Form 10-K.

Page 88 of 88

EX-21

Exhibit 21

SUBSIDIARIES OF THE REGISTRANT

NAME	JURISDICTION OF ORGANIZATION OR INCORPORATION
SEI Investments Distribution Co.	Pennsylvania
SEI Investments Management Corporation	Delaware
SEI Investments Developments, Inc.	Delaware
SEI Investments Global Funds Services	Delaware
SEI Custodial Operations Company, LLC	Delaware
SEI Trust Company	Pennsylvania
SEI Funds, Inc.	Delaware
SEI Investments, Inc.	Delaware
SEI Global Investments Corporation	Delaware
SEI Investments Canada Company	Canada (Federal)
SEI Advanced Capital Management, Inc.	Delaware
SEI Global Capital Investments, Inc.	Delaware
SEI Investments Global (Cayman), Ltd.	Cayman Islands, B. W. I.
SEI Investments Global, Limited	Ireland
SEI Investments Global Fund Services, Ltd.	Ireland
SEI Global Holdings (Cayman) Inc.	Cayman Islands, B. W. I.
SEI Investments (South Africa) Limited	South Africa
SEI Primus Holding Corporation	Delaware
SEI Investments Trustee & Custodial Services (Ireland) Limited	Ireland
SEI Private Trust Company	Pennsylvania
SEI Ventures, Inc.	Delaware
SEI Asset Korea Co., Ltd.	South Korea
SEI Investments Europe Limited	United Kingdom
SEI SIMC Holdings, LLC	Delaware
SIMC Subsidiary, LLC	Delaware
SEI Global Nominee Ltd.	United Kingdom
SEI Insurance Group, Inc.	Pennsylvania
SEI Global Services, Inc.	Delaware
SEI Franchise, Inc.	Delaware
SEI Investments (Asia), Limited	Hong Kong
SEI European Services Limited	United Kingdom
SEI Trustees Limited	United Kingdom
SEI Investment Strategies, LLC	Delaware
LSV Asset Management	Delaware
SEI Institutional Transfer Agent, Inc.	Delaware

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 2-73997, No. 333-41343, No. 333-111224, and No. 333-149549) of SEI Investments Company of our report dated February 27, 2012 relating to the financial statements, financial statement schedule, and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 27, 2012

EX-23.2

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 2-73997, No. 333-41343, No. 333-111224, and No. 333-149549) of SEI Investments Company of our report dated February 27, 2012 relating to the financial statements of LSV Asset Management which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 27, 2012

EX-31.1

Exhibit 31.1

RULE 13a-15(e)/15d-15(e)

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Alfred P. West, Jr., certify that:

1. I have reviewed this Annual Report on Form 10-K of SEI Investments Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 27, 2012

/s/ Alfred P. West, Jr.

Alfred P. West, Jr.

Chairman and Chief Executive Officer

EX-31.2

Exhibit 31.2

RULE 13a-15(e)/15d-15(e)

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Dennis J. McGonigle, certify that:

1. I have reviewed this Annual Report on Form 10-K of SEI Investments Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 27, 2012

/s/ Dennis J. McGonigle

Dennis J. McGonigle

Chief Financial Officer

EX-32

Exhibit 32

SECTION 1350 CERTIFICATIONS

I, Alfred P. West, Jr., Chairman and Chief Executive Officer, and Dennis J. McGonigle, Chief Financial Officer, of SEI Investments Company, a Pennsylvania corporation (the “Company”), hereby certify that, to my knowledge:

(1) The Company’s Annual Report on Form 10-K for the annual period ended December 31, 2011 (the “Form 10-K”) fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and

(2) The information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 27, 2012	Date: February 27, 2012
/s/ Alfred P. West, Jr.	/s/ Dennis J. McGonigle
Alfred P. West, Jr.	Dennis J. McGonigle
Chairman and Chief Executive Officer	Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-99.2

LSV Asset Management

Financial Statements

As of December 31, 2011 and 2010 and for each of the three years in the period ended December 31, 2011

LSV Asset Management

Index

December 31, 2011

	Page(s)
Report of Independent Registered Public Accounting Firm		1
Report of Independent Auditors		2
Financial Statements
Balance Sheets		3
Statements of Operations		4
Statements of Changes in Partners’ Capital		5
Statements of Cash Flows		6
Notes to Financial Statements		7–11

Report of Independent Registered Public Accounting Firm

To the Management Committee and Partners of

LSV Asset Management:

In our opinion, the accompanying balance sheets and the related statements of operations, changes in partners’ capital and cash flows present fairly, in all material respects, the financial position of LSV Asset Management (“the Partnership”) at December 31, 2011 and 2010, and the results of its operations and its cash flows for the years then ended in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits 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, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

/s/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

February 27, 2012

1

Report of Independent Auditors

To the Management Committee and Partners of

LSV Asset Management:

In our opinion, the accompanying statements of operations, changes in partners’ capital and cash flows present fairly, in all material respects, the results of operations of LSV Asset Management (“the Partnership”) and its cash flows for the year ended December 31, 2009 in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on these financial statements based on our audit. We conducted our audit of these statements in accordance with auditing standards generally accepted in the United States of America. 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, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.

/s/ PricewaterhouseCoopers LLP

Philadelphia, Pennsylvania

March 26, 2010

2

LSV Asset Management

Balance Sheets

December 31, 2011 and 2010

(in thousands of dollars)

	2011		2010
Assets
Current assets
Cash	$	60,728	$	64,464
Management fee receivables, net of allowance for doubtful accounts of $804 and $369 (Note 2)		74,951		75,056
Prepaid expenses and other current assets		922		848
Total current assets		136,601		140,368
Fixed assets, net of accumulated depreciation of $2,164 and $2,658 (Note 2)		3,880		4,159
Total assets	$	140,481	$	144,527
Liabilities and Partners’ Capital
Accrued compensation	$	10,937	$	7,984
Accrued other		1,555		1,659
Total accrued liabilities		12,492		9,643
Due to SEI Funds, Inc. (Note 5)		1,441		1,556
Total current liabilities		13,933		11,199
Commitments and contingencies (Note 3)		—		—
Partners’ capital		126,548		133,328
Total liabilities and partners’ capital	$	140,481	$	144,527

The accompanying notes are an integral part of these financial statements.

3

LSV Asset Management

Statements of Operations

Years Ended December 31, 2011, 2010 and 2009

(in thousands of dollars)

	2011		2010		2009
Revenue
Management fees	$	296,361	$	273,337	$	211,961
Interest income		36		44		34
Total revenue		296,397		273,381		211,995
Expenses
Compensation, benefits & other personnel		24,626		22,295		20,242
Stock based compensation		1,954		1,275		542
Consulting & professional fees		2,705		2,606		2,638
Data processing and computer related		5,039		4,272		3,592
Facilities, supplies and other costs		3,608		2,195		3,265
Depreciation		946		757		394
Total expenses		38,878		33,400		30,673
Net income	$	257,519	$	239,981	$	181,322

The accompanying notes are an integral part of these financial statements.

4

LSV Asset Management

Statements of Changes in Partners’ Capital

Years Ended December 31, 2011, 2010 and 2009

(in thousands of dollars)

	Partnership Capital
Balance, December 31, 2008	$	111,420
Net income		181,322
Partnership distributions		(175,113	)
Balance, December 31, 2009		117,629
Net income		239,981
Partnership distributions		(224,282	)
Balance, December 31, 2010		133,328
Net income		257,519
Partnership distributions		(264,299	)
Balance, December 31, 2011	$	126,548

The accompanying notes are an integral part of these financial statements.

5

LSV Asset Management

Statements of Cash Flows

Years Ended December 31, 2011, 2010 and 2009

(in thousands of dollars)

	2011			2010			2009
Cash flows from operating activities
Net income	$	257,519		$	239,981		$	181,322
Adjustments to reconcile net income to cash provided by operating activities
Depreciation		946			757			393
Provision for losses on receivables		435			(779	)		(20	)
Change in assets and liabilities
Decrease (increase)
Management fee receivables		(330	)		(8,276	)		(9,057	)
Prepaid expenses and other current assets		(74	)		168			(273	)
Increase (decrease)
Accrued compensation		2,953			2,173			695
Accrued other		(104	)		719			(38	)
Due to SEI Funds, Inc.		(115	)		15			(7	)
Net cash provided by operating activities		261,230			234,758			173,015
Cash flows from investing activities
Purchases of fixed assets		(667	)		(3,115	)		(1,356	)
Sale of marketable securities		—			42			—
Net cash used in investing activities		(667	)		(3,073	)		(1,356	)
Cash flows from financing activities
Partnership distributions		(264,299	)		(224,282	)		(175,113	)
Net cash used in financing activities		(264,299	)		(224,282	)		(175,113	)
Net increase (decrease) in cash		(3,736	)		7,403			(3,454	)
Cash
Beginning of year		64,464			57,061			60,515
End of year	$	60,728		$	64,464		$	57,061

The accompanying notes are an integral part of these financial statements.

6

LSV Asset Management

Notes to Financial Statements

December 31, 2011, 2010, and 2009

(in thousands of dollars)

1. Background

LSV Asset Management (“LSV” or the “Partnership”), a Delaware general partnership, is a registered investment advisor that provides management services to institutions, including pension plans and investment companies. LSV uses the Quantitative Value Analysis Method and Software to market its investment advisory services. SEI Funds, Inc. (a wholly-owned subsidiary of SEI Investments Company (“SEI”)) owns approximately 41 percent of the Partnership and the remaining portion, approximately 59 percent is owned by LSV employees. The general Partnership Agreement has been amended from time to time to include new partners when they are admitted. The partnership interest of each existing partner is diluted on a pro rata basis when a new partner is admitted.

The business and affairs of LSV are managed under the direction of the management committee. The management committee consists of certain partners of the Partnership. The voting interest by each partner on the management committee differs from their partnership ownership percentage.

2. Summary of Significant Accounting Policies

Cash and Cash Equivalents

LSV considers investment instruments purchased with an original maturity of three months or less to be cash and cash equivalents.

Allowance for Doubtful Accounts

LSV provides an allowance for doubtful accounts equal to the estimated uncollectible amounts. LSV’s estimate is based on historical collection experience and a review of the current status of accounts receivable.

Revenue Recognition and Related Receivables

Management fee receivables on the accompanying Balance Sheets represent receivables earned and billed, as well as earned but unbilled. Unbilled receivables result from timing differences between services provided and contractual billing schedules. Management fee receivables on the accompanying Balance Sheets consist of the following:

	2011			2010
Management fee receivables	$	12,445		$	6,935
Unbilled management fee receivables		63,310			68,490
		75,755			75,425
Less: Allowance for doubtful accounts		(804	)		(369	)
Total management fee receivables	$	74,951		$	75,056

Revenues from management fees are recognized in the period in which services are performed and are calculated based upon a contractual percentage of net assets under management.

Allocations of Net Income or Net Loss

In accordance with the Partnership Agreement, all partnership net profits or losses are allocated among the partners in accordance with their respective ownership interests. Such allocations are

7

LSV Asset Management

Notes to Financial Statements

December 31, 2011, 2010 and 2009

(in thousands of dollars)

included in the “Partnership Capital” balance on the accompanying Statements of Changes in Partners’ Capital.

Partnership Distributions

In accordance with the Partnership Agreement, Partners’ distributions are based upon the net quarterly cash flows of the partnership and are generally paid in the following quarter. Such distributions represent reductions of partners’ capital and are included in the Statements of Changes in Partners’ Capital. Included in Partnership distributions are state taxes paid on certain partners’ behalf and which represent a reduction in Partners’ Capital.

Guarantees and Indemnifications

In the ordinary course of business, the Partnership from time to time enters into contracts containing indemnification obligations of the Partnership. These obligations may require the Partnership to make payments to another party upon the occurrence of certain events including the failure by the Partnership to meet its performance obligations under the contract. These contractual indemnification provisions are often standard contractual terms of the nature customarily found in the type of contracts entered into by the Partnership. In many cases, there are no stated or notional amounts included in the indemnification provisions. There are no amounts reflected on the accompanying Balance Sheets related to these indemnifications.

In January 2006, certain LSV partners sold a portion of their partnership interests in LSV to LSV Employee Group LLC (“the 2006 purchase”), and in April 2011 an LSV partner sold their partnership interests in LSV to LSV Employee Group II, LLC (“the 2011 purchase”). LSV Employee Group LLC and LSV Employee Group II, LLC (the “Borrowers”), are owned by certain current employees of LSV. In order to finance a portion of the purchase price for such interests, the Borrowers obtained financing from Bank of America N.A. (the “Agent”) and certain other lenders in the form of term loans pursuant to the terms of Credit Agreements. The principal amount of the term loans were $82,800 for the 2006 purchase and $3,655 for the 2011 purchase. The Borrowers have pledged their interests as collateral to secure the term loans. SEI has entered into Guarantee and Collateral Agreements with the Borrowers and the Agent (“the SEI Guarantee Agreements”). According to the terms and conditions of the SEI Guarantee Agreements, SEI agreed to provide unsecured guarantees to the lenders of all obligations of the Borrowers under the Credit Agreements. LSV has also entered into Guarantee and Collateral Agreements with the Borrowers and the Agent (“the LSV Guarantee Agreements”). According to the terms and conditions of the LSV Guarantee Agreements, LSV has agreed to pay 51 percent of the distributable net cash flow if payment has not been received in full from SEI Funds, Inc. within 30 days after delivery of its demand for payment.

In January 2011 LSV Employee Group and Bank of America agreed to amend the Credit Agreement and extend the maturity date of the loan from January 2011 to July 2012. There were no changes to the interest rate, payment terms or covenants under the amended agreement.

All payments under the term loans through December 31, 2011 were made by the Borrowers. LSV Employee Group made the final principal payment in October 2011 for the term loan in connection with the 2006 purchase and has no further obligation regarding the related Credit Agreement. As of December 31, 2011, the remaining unpaid principal balance of the term loan related to the 2011 purchase was $3,197.

8

LSV Asset Management

Notes to Financial Statements

December 31, 2011, 2010 and 2009

(in thousands of dollars)

Fixed Assets

Fixed assets consist of the following at December 31:

	2011			2010			Estimated Useful Lives
Equipment	$	1,732		$	1,180		3 to 5
Leasehold improvements		3,102			4,530		Lease Term
Furniture and fixtures		1,210			1,107		5
		6,044			6,817
Less: Accumulated depreciation		(2,164	)		(2,658	)
	$	3,880		$	4,159

Fixed assets are recorded at historical cost. Depreciation of fixed assets is computed using the straight-line method over the estimated useful lives. Amortization of leasehold improvements is computed using the straight-line method over the shorter of the remaining lease term or the estimated useful lives of the improvements.

Management’s Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement and the reported amounts of revenue and expenses during the period. Actual results could differ from those estimates.

Concentration of Credit Risk

Financial instruments which potentially expose the Partnership to concentrations of credit risk consist primarily of cash and management fee revenue and receivables. Cash deposits can be maintained with institutions in excess of federally insured limits.

Concentrations of credit risk with respect to our receivables are limited due to the large number of clients and their dispersion across geographic areas. No single group or customer represents greater than 10 percent of total revenue and accounts receivable.

Fair Value of Financial Instruments

The Partnership’s financial instruments consist primarily of cash and cash equivalents. The book value of cash and cash equivalents, trade receivables and trade payables is considered to be representative of their fair value because of their short maturities. The recorded value of these financial instruments approximates their fair value at December 31, 2011 and 2010.

The accounting standard for fair value measurements defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting standard also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

9

LSV Asset Management

Notes to Financial Statements

December 31, 2011, 2010, and 2009

(in thousands of dollars)

3. Commitments and Contingencies

The Partnership has entered into various operating leases for facilities. Some of these leases contain escalation clauses. The aggregate noncancellable minimum commitments at December 31, 2011 are as follows:

2012	$	932
2013		949
2014		966
2015		983
2016 and thereafter		5,215
	$	9,045

Rent expense which is included in Facilities, supplies and other costs on the accompanying Statements of Operations was $1,137, $1,057 and $783 in 2011, 2010, and 2009, respectively.

4. Income Taxes

No federal or state income taxes are provided for by LSV as each partner is liable for income taxes on their respective share of LSV’s taxable income, if any.

LSV’s tax return is subject to examination by federal and state taxing authorities. If such examinations result in changes to LSV’s taxable income, the tax liability of each partner would change accordingly.

The Partnership did not have any unrecognized tax benefit as of December 31, 2011, 2010 and 2009.

5. Related Party Transactions

Under LSV’s Partnership Agreement, SEI Funds, Inc. is responsible for performing various services to support LSV’s advisory business. In connection with such services, SEI Funds, Inc. allocates certain of its costs including employee benefits and other general and administrative expenses to LSV. The amount payable to SEI Funds, Inc. is included in the Due to SEI Funds, Inc. balance on the accompanying Balance Sheets. The balance due to SEI Funds, Inc. is paid on a monthly basis, is non-interest bearing, and includes compensation, benefit and other general and administrative expenses.

LSV has entered into a Guaranty and Collateral Agreement with LSV Employee Group II and Bank of America. See Note 2 for Guarantees and Indemnifications.

LSV is party to a number of portfolio investment advisory agreements with SEI Investments Management Corporation, SEI Global Asset Management Ltd., and SEI Investments Canada Company (all wholly-owned subsidiaries of SEI). Under these agreements, LSV receives an annual fee based on the assets under LSV’s management in various SEI-sponsored funds. Total fees earned under these agreements were $5,102, $4,387 and $3,388 in 2011, 2010 and 2009, respectively. The Management fee receivables balance on the accompanying Balance Sheets included $418 and $381 of such fees at December 31, 2011 and 2010, respectively.

10

LSV Asset Management

Notes to Financial Statements

December 31, 2011, 2010, and 2009

(in thousands of dollars)

Following completion of eligibility requirements, LSV employees are able to participate in the Capital Accumulation Plan (“CAP”), a SEI-sponsored employee benefit plan. CAP is a tax-qualified defined contribution plan which provides retirement benefits, including provisions for early retirement and disability benefits, as well as a tax-deferred savings feature. Participants are vested in employer contributions at the time the contributions are made. All SEI contributions are discretionary and are made from available profits. The employer contribution expense is included in Compensation, benefits & other personnel on the accompanying Statements of Operations. Costs incurred by the Partnership related to the CAP were immaterial in 2011, 2010, and 2009.

Following completion of eligibility requirements, LSV employees are able to participate in a SEI employee stock purchase plan. The plan provides for offering of common stock to eligible employees at a price equal to 85 percent of the fair value at the end of the stock purchase period, as defined. Costs incurred by the Partnership related to the employee stock purchase plan were immaterial in 2011, 2010, and 2009.

6. Accrued stock based compensation

In March 2009, certain partners (the Contributing Partners) of LSV authorized for designation a portion of their partnership interest for the purpose of providing an interest in LSV. This interest was authorized and to be awarded to a select group of key employees. The partnership granted portions of the authorized partnership interest to key employees in March 2009, July 2010, and April 2011. At the time partnership interest is granted, rights to receive distributions equal to the full granted percentage transfers to the recipient of the grant. Partnership equity equal to the amount of interest granted is earned over a predetermined vesting period. All profits, losses, distributions and other rights and obligations relating to authorized but undesignated partnership interest remains with the Contributing Partners until such interest is granted. The granted partnership interest is treated as a liability and is calculated on projected net income. The granted partnership interest redemption liability amounted to $3,771, $1,817, and $542 at December 31, 2011, 2010 and 2009 respectively. Each issuance must be authorized by unanimous vote of all Contributing Partners. The issuance of an interest in LSV to a key employee provides them an interest in the future profits of LSV. It does not provide them any rights in the management of the partnership or the ability to direct the operations or affairs of LSV.

7. Subsequent Events

The Company performed an evaluation of subsequent events through February 27, 2012, which is the date the financial statements were made available to be issued.

11

XML

Investment In Unconsolidated Affiliate (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended			1 Months Ended		12 Months Ended				1 Months Ended		12 Months Ended		1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Oct. 31, 2011	Dec. 31, 2006	Dec. 31, 2011 LSV [Member]	Dec. 31, 2010 LSV [Member]	Dec. 31, 2009 LSV [Member]	Jan. 31, 2011 LSV Employee Group [Member]	Jan. 31, 2010 LSV Employee Group [Member]	Dec. 31, 2011 LSV Employee Group [Member]	Dec. 31, 2010 LSV Employee Group [Member]	Dec. 31, 2009 LSV Employee Group [Member]	Dec. 31, 2006 LSV Employee Group [Member] years	Jan. 31, 2012 LSV Employee Group II [Member]	Apr. 30, 2011 LSV Employee Group II [Member]	Dec. 31, 2011 LSV Employee Group II [Member]	Dec. 31, 2010 LSV Employee Group II [Member]	Apr. 30, 2011 Bank of America [Member] LSV Employee Group II [Member]	Jan. 31, 2010 Maximum [Member] LSV [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	41.00%				43.00%															50.00%
Total investment in LSV	$ 60,954	$ 64,409
Investment in LSV in excess of the underlying equity in net assets	3,717
Partnership distribution payments received from LSV						109,273	93,302	73,518		21,242
Purchase price related to intangible assets														72,220
Purchase price related to goodwill														19,780
Acquired intangible assets estimated useful life														10
Amortization expense of intangible assets													7,222
Principal amount of term loan														82,800	2,978			3,197
Maturity of term loan, years									January 2011
Credit agreement, expiration date									July 2012
Amount financed through new term loan																			3,655
Acquisition of additional partnership interest														8.00%
Purchase partnership interest																4,300
Debt instrument, periodic payment, principal											10,091	10,461			219		458
Current debt obligation				0
Goodwill						3,062
Maturity of term loan, years																	four
Interest Expense	$ 585	$ 1,478	$ 3,744										$ 1,510

XML

Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2010	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009	Jan. 31, 2012
Stock options vested in 2006, vesting period, years		seven
Weighted average fair value of stock options granted		$ 5.70	$ 9.65	$ 7.24
Change in management estimate of stock based compensation expense amortization			$ 11,663	$ 8,223
Previously recognized stock-based compensation costs reversed	6,375
Unrecognized compensation cost		48,123	27,460
Exercisable shares		11,680,000	14,247,000	11,801,000
Expiration dates for options outstanding, period start		December 10, 2012
Expiration dates for options outstanding, period end		December 13, 2021
Options outstanding weighted average remaining contractual life, years		5.9
Total intrinsic value of options exercised		8,642	9,961
Total intrinsic value of options outstanding		0
Aggregate intrinsic value of options exercisable		1,534
Common stock, market value		$ 17.35
Windfall tax benefits		142,872	141,438
Dividend distribution for rights agreement, date declared		December 2008
Dividend distribution for rights agreement, declared effective date		January 6, 2009
Rights received by common shareholder for each common share outstanding, rights		1
Series A Junior Participating Preferred stock, par value		$ 0.05	$ 0.05
Remaining stock repurchase authorization amount					95,823
Securities and assets of equivalent value, purchase price, per unit		$ 150
Number of days, rights become exercisable following public announcement		ten
Acquiring Person, beneficial ownership of the outstanding common stock, minimum percentage		20.00%
Holders, other than an acquiring person, right to purchase of common stock upon exercise of rights		twice
Common shares received by holders upon surrender of rights, percentage		50.00%
Rights non-voting, expiration date		Jan. 06, 2019
Rights non-voting, redeemable days		ten
Right redeemable price, per right		$ 0.01
Cash dividends		$ 48,558	$ 37,513	$ 32,422
2007 Plan [Member]
Number of active equity compensation plans		1
Options available for grant		20,000,000
Percentage of stock options vested when specified diluted earnings per share targets are achieved		50.00%
Remaining percentage of stock options vested when secondary, higher specified diluted earnings per share targets are achieved		50.00%
Employee Stock Purchase Plan [Member]
Employee stock purchase plan, employee eligible percentage on offerings of common stock		85.00%
Shares reserved under the plan		15,600,000
Issuance of common stock under the employee stock purchase plan, shares		11,474,000
Interim Cash Dividends [Member]
Cash dividends declared, per share		$ 0.12
Final Cash Dividends [Member]
Cash dividends declared, per share		$ 0.15

XML

Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 8,010	$ 5,853
Fixed-income available-for-sale securities	74,998	68,917
Fixed income securities owned	20,949	0
Trading securities	56,325	104,594
Assets, fair value	160,282	179,364
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	8,010	5,853
Fixed-income available-for-sale securities	0	0
Fixed income securities owned	0
Trading securities	3,702	3,949
Assets, fair value	11,712	9,802
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0	0
Fixed-income available-for-sale securities	74,998	68,917
Fixed income securities owned	20,949
Trading securities	0	0
Assets, fair value	95,947	68,917
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0	0
Fixed-income available-for-sale securities	0	0
Fixed income securities owned	0
Trading securities	52,623	100,645
Assets, fair value	$ 52,623	$ 100,645

XML

Income Taxes (Schedule Of Deferred Income Tax Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Gross assets	$ 1,151	$ 1,388
Gross liabilities	(1)	(1)
Current deferred income tax assets and liabilities	1,150	1,387
Valuation allowance	0	0
Current deferred income taxes	1,150	1,387
Gross assets	63,374	59,892
Gross liabilities	(148,540)	(143,137)
Long term deferred income tax assets and liabilities	(85,166)	(83,245)
Valuation allowance	(8,585)	(9,008)
Long term deferred income taxes	(93,751)	(92,253)
Net deferred income tax liability	$ (92,601)	$ (90,866)

XML

Shareholders' Equity (Assumptions Used In The Weighted Average Fair Value Of The Stock Options Granted) (Details)	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years	Dec. 31, 2009 years
Shareholders' Equity [Abstract]
Expected term (in years)	7.65	7.45	7.49
Expected volatility	40.43%	36.35%	37.44%
Expected dividend yield	1.90%	0.84%	1.02%
Risk-free interest rate	1.66%	3.01%	3.31%

XML

Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Related Party Transactions [Abstract]
Investment advisory and administration fees received by the company	$ 364,602	$ 354,341	$ 334,084
Fees Received for providing shareholder, administrative and distribution services	39,017	36,007	33,008
Brokerage commissions revenue	$ 2,772	$ 4,875	$ 4,300

XML

Composition Of Certain Financial Statement Captions (Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Composition Of Certain Financial Statement Captions [Abstract]
Accrued employee compensation	$ 48,112	$ 43,747
Accrued employee benefits and other personnel	5,408	6,988
Accrued consulting, outsourcing and professional fees	17,477	16,390
Accrued brokerage fees	8,665	11,942
Accrued sub-advisory, distribution and other asset management fees	17,091	16,778
Accrued income taxes	0	2,077
Accrued dividend payable	26,518	0
Other accrued liabilities	23,773	23,488
Accrued liabilities	$ 147,044	$ 121,410

XML

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Commitments And Contingencies [Abstract]

Schedule Of Noncancellable Minimum Commitments

2012	$	17,892
2013		13,527
2014		6,997
2015		1,955
2016 and thereafter		10,419
	$	50,790

XML

Quarterly Financial Data (SIV-Related Gains (Losses)) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Available-for-sale Securities [Line Items]
Revenues	$ 226,247		$ 233,227		$ 237,760		$ 232,493		$ 231,399		$ 219,513		$ 228,388		$ 221,535		$ 929,727	$ 900,835	$ 1,060,548
Income before income taxes	68,603		74,900		82,820		92,164		96,180		91,032		86,442		96,127		318,487	369,781	362,318
Net income attributable to SEI	44,396		49,232		53,603		57,728		62,400		56,389		53,478		59,420		204,959	231,687	174,335
Basic earnings per share	$ 0.25		$ 0.27		$ 0.29		$ 0.31		$ 0.33		$ 0.30		$ 0.28		$ 0.31		$ 1.12	$ 1.23	$ 0.91
Diluted earnings per share	$ 0.25		$ 0.27		$ 0.29		$ 0.31		$ 0.33		$ 0.30		$ 0.28		$ 0.31		$ 1.11	$ 1.22	$ 0.91
Effective tax rates	34.70%		33.80%		34.70%		37.10%		37.00%		37.80%		37.80%		37.90%		35.20%	37.00%	33.90%
SIV Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Diluted earnings per share	$ 0.00	[1]	$ 0.00	[1]	$ 0.01	[1]	$ 0.02	[1]	$ 0.05	[2]	$ 0.03	[2]	$ 0.01	[2]	$ 0.06	[2]
Total SIV-related gains (losses)	$ (738)		$ (792)		$ (1,944)		$ 6,864		$ 14,257		$ 8,728		$ 3,913		$ 17,349

[1] Attributable to SIV-related gains (losses).

[2] Attributable to SIV-related gains.

XML

Business Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Business Segment Information [Abstract]
Percentage of customers to total revenue	10.00%	10.00%

XML

Shareholders' Equity (Schedule Of Recognition Of Compensation Cost) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Temporary Equity [Line Items]
Stock-Based Compensation Expense	$ 48,123	$ 27,460
2012 [Member]
Temporary Equity [Line Items]
Stock-Based Compensation Expense	14,398
2013 [Member]
Temporary Equity [Line Items]
Stock-Based Compensation Expense	12,704
2014 [Member]
Temporary Equity [Line Items]
Stock-Based Compensation Expense	12,510
2015 [Member]
Temporary Equity [Line Items]
Stock-Based Compensation Expense	3,846
2016 [Member]
Temporary Equity [Line Items]
Stock-Based Compensation Expense	2,355
2017 [Member]
Temporary Equity [Line Items]
Stock-Based Compensation Expense	$ 2,310

XML

Business Segment Information (Additional Information Pertaining To Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Segment Reporting Information [Line Items]
Capital Expenditures	$ 53,225		$ 52,340		$ 63,216
Depreciation	21,471		21,902		21,531
Amortization	27,288		24,048		44,608
Total Assets	1,294,559		1,377,223
LSV [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	0		0		1,358
Depreciation	0		0		395
Amortization	0		0		436
LSV Employee Group [Member]
Segment Reporting Information [Line Items]
Amortization	0		0		7,280
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	35,045		32,982		39,364
Depreciation	15,648		15,704		15,415
Amortization	18,081		15,100		24,058
Total Assets	457,333		460,261
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	11,933		11,691		13,607
Depreciation	2,251		2,384		2,286
Amortization	6,201		5,467		8,550
Total Assets	119,053		113,111
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	2,059		2,601		2,665
Depreciation	1,079		1,170		1,108
Amortization	864		1,213		927
Total Assets	80,133		72,867
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	3,081		3,659		4,306
Depreciation	1,809		1,891		1,580
Amortization	580		820		688
Total Assets	95,760		96,378
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	577		608		831
Depreciation	114		148		176
Amortization	433		477		1,897
Total Assets	5,962		6,801
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	52,695		51,541		62,131
Depreciation	20,901		21,297		20,960
Amortization	26,159		23,077		36,556
Total Assets	758,241		749,418
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	530		799		1,085
Depreciation	570		605		571
Amortization	1,129		971		772
Total Assets	$ 536,318	[1]	$ 627,805	[1]

[1] Unallocated assets primarily consist of cash and cash equivalents, marketable securities, and certain other shared services assets.

XML

Business Segment Information (Revenues And Assets Based On The Location Of The Use Of The Products Or Services) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 226,247	$ 233,227	$ 237,760	$ 232,493	$ 231,399	$ 219,513	$ 228,388	$ 221,535	$ 929,727	$ 900,835	$ 1,060,548
Assets	1,294,559				1,377,223				1,294,559	1,377,223
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									785,506	767,068	950,891
Assets	1,098,643				1,193,775				1,098,643	1,193,775
International Operations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									144,221	133,767	109,657
Assets	$ 195,916				$ 183,448				$ 195,916	$ 183,448

XML

Income Taxes (Tax Effect Of Significant Temporary Differences Representing Deferred Tax Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Difference in financial reporting and income tax depreciation methods	$ (13,600)	$ (11,402)
Reserves not currently deductible	374	472
Capitalized software currently deductible for tax purposes, net of amortization	(139,455)	(132,030)
State deferred income taxes	6,717	5,337
Revenue and expense recognized in different periods for financial reporting and income tax purpose	3,149	3,015
Unrealized holding loss (gain) on investments	(927)	(5,292)
Stock-based compensation expense	43,879	40,096
State net operating loss carryforward	14,485	16,634
Valuation allowance on deferred tax assets	(8,585)	(9,008)
Federal benefit of state tax deduction for uncertain tax positions	1,725	1,542
Other, net	(363)	(230)
Net deferred income tax liability	$ (92,601)	$ (90,866)

XML

Summary Of Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies [Abstract]

Nature Of Operations

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations solutions to corporations, financial institutions, financial advisors, and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe, and other various locations throughout the world. Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing solutions are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, except for fees earned associated with trade execution services.

Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations solutions offer investment managers support for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. These solutions also provide support to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas. Revenues from investment operations solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Principles Of Consolidation

Principles of Consolidation

The Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries and entities in which it holds a controlling financial interest. The Company determines whether it has a controlling financial interest either by its decision-making ability through voting interests or by the extent of the Company's participation in the economic risks and rewards of the entity through variable interests. The Company accounts for noncontrolling interests in consolidated entities for which the Company's controlling financial interest is less than 100 percent. The Company's principal subsidiaries are SEI Investments Distribution Co. (SIDCO), SEI Investments Management Corporation (SIMC), SEI Private Trust Company (SPTC), SEI Trust Company (STC), SEI Global Services, Inc. (SGSI) and SEI Investments (Europe) Limited (SIEL). All intercompany accounts and transactions have been eliminated.

In January 2010, new accounting guidance pertaining to the consolidation of VIEs became effective. Under the new guidance, the Company was not considered the primary beneficiary of LSV Employee Group (See Note 2). The Company, therefore, discontinued consolidating the accounts and operations of LSV Asset Management (LSV) and LSV Employee Group in its financial statements. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company's interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheet and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statement of Operations. The deconsolidation of LSV had no effect on Net income attributable to SEI. Prior period financial statements are not reclassified for the new accounting guidance.

Noncontrolling interest on the accompanying Consolidated Balance Sheets includes the interest of other shareholders in a joint venture of the Company in an asset management firm located in South Korea.

Variable Interest Entities

        Variable Interest Entities

The Company has involvement with various variable interest entities (VIE or VIEs). These VIEs consist of LSV Employee Group and investment products established for clients created in the form of various types of legal entity structures. In June 2009, the Financial Accounting Standards Board (FASB) issued guidance related to the consolidation of VIEs. This guidance changed how a company determines when an entity that is insufficiently capitalized or is not controlled through voting common stock should be consolidated. The determination of whether a company is required to consolidate an entity is based on, among other things, an entity's purpose and design, a company's ability to direct the activities of the entity that most significantly impact the entity's economic performance, and whether a company is obligated to absorb losses or receive benefits that could be potentially significant to the entity. The guidance requires ongoing reassessments of whether an enterprise is the primary beneficiary of a VIE and requires disclosures about an enterprises involvement in VIEs.

Under the new guidance, LSV Employee Group remains a VIE. However, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group either directly or through any financial responsibility from the Guaranty Agreement. As of January 1, 2010, the Company discontinued consolidating the accounts of LSV Employee Group. The Company does not have any direct equity interest in LSV Employee Group.

In January 2010, the FASB deferred the new guidance for certain types of investment entities. The deferral allows asset managers that have no obligation to fund potentially significant losses of an investment entity to continue to apply the previous guidance to investment entities that have attributes of entities defined in the "Investment Company Guide." The deferral applies to many mutual funds, hedge funds, private equity funds, venture capital and certain other types of entities. Also, money market funds subject to rule 2a-7 of the Investment Company Act of 1940 qualify for deferral. However, the deferral does not apply to the new disclosure requirements. All of the Company's investment products where the Company is the sponsor and/or investment manager that are VIEs qualify for the deferral; therefore, the Company will continue to apply the previous guidance for the consolidation of VIEs (See Note 3).

Management's Use Of Estimates

Management's Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Revenue Recognition

Revenue Recognition

The Company's principal sources of revenues are: (1) asset management, administration and distribution fees earned based upon a contractual percentage of net assets under management or administration; (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or non-recurring and based upon project-oriented contractual agreements related to client implementations; and (3) transaction-based fees for providing trade-execution services. The majority of the Company's revenues are based on contractual arrangements. Revenues are recognized in the periods in which the related services are performed provided that persuasive evidence of an agreement exists, the fee is fixed or determinable, and collectibility is reasonably assured. Cash received by the Company in advance of the performance of services is deferred and recognized as revenue when earned. Reimbursements received for out-of-pocket expenses incurred are recorded as revenue. Certain portions of the Company's revenues require management's consideration of the nature of the client relationship in determining whether to recognize as revenue the gross amount billed or net amount retained after payments are made to suppliers for certain services related to the product or service offering.

Cash And Cash Equivalents

Cash and Cash Equivalents

The Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents include $281,760 and $383,946 at December 31, 2011 and 2010, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds.

Restricted Cash

Restricted Cash

Restricted cash includes $5,000 and $3,000 at December 31, 2011 and 2010, respectively, segregated for regulatory purposes related to trade-execution services conducted by SIEL. Restricted cash also includes $1,000 at December 31, 2011 and 2010 segregated in special reserve accounts for the benefit of SIDCO customers in accordance with certain rules established by the Securities and Exchange Commission for broker-dealers.

Allowances For Doubtful Accounts

Allowances for Doubtful Accounts

The Company provides an allowance for doubtful accounts equal to the estimated uncollectible amounts. The Company's estimate is based on historical collection experience and a review of the current status of trade accounts receivable.

Concentration Of Credit Risk

Concentration of Credit Risk

Financial instruments which potentially expose the Company to concentrations of credit risk consist primarily of cash equivalents and trade receivables. Cash equivalents are principally invested in short-term money market funds or placed with major banks and high-credit qualified financial institutions. Cash deposits maintained with institutions are in excess of federally insured limits. Concentrations of credit risk with respect to our receivables are limited due to the large number of clients and their dispersion across geographic areas. No single group or customer represents greater than ten percent of total accounts receivable.

Property And Equipment

Property and Equipment

Property and Equipment are recorded at cost. Expenditures for major additions and improvements are capitalized and minor replacements, maintenance, and repairs are charged to expense as incurred. Construction in progress includes the cost of construction and other direct costs attributable to the construction. When property and equipment are retired or disposed of, the related cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is included in the results of operations for the respective period. Depreciation is provided over the estimated useful lives using the straight line method for financial statement purposes. No provision for depreciation is made for construction in progress until such time as the relevant assets are completed and put into service. The Company uses other depreciation methods, generally accelerated, for tax purposes where appropriate. Buildings and building improvements are depreciated over 25 to 39 years. Equipment, purchased software and furniture and fixtures have useful lives ranging from three to five years. Amortization of leasehold improvements is computed using the straight line method over the shorter of the remaining lease term or the estimated useful lives of the improvements

Marketable Securities

Marketable Securities

The classification of investments in marketable securities is determined at the time of purchase and reevaluated at each balance sheet date. Debt and equity securities classified as available-for-sale are reported at fair value as determined by the most recently traded price of each security at the balance sheet date. Unrealized gains and losses, net of income taxes, are reported as a separate component of comprehensive income. SIDCO, the Company's broker-dealer subsidiary, reports changes in fair value of marketable securities through current period earnings due to specialized accounting practices related to investments by broker-dealers. The Company records all of its trading securities on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these securities are recognized in current period earnings. The specific identification method is used to compute the realized gains and losses on all of the Company's marketable securities (See Note 6).

The Company evaluates the realizable value of its marketable securities on a quarterly basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. Some of the factors considered in determining other-than-temporary impairment for equity securities include, but are not limited to, significant or prolonged declines in the fair value of the investments, the Company's ability and intent to retain the investment for a period sufficient to allow the value to recover, and the financial condition of the investment. Some of the factors considered in determining other-than-temporary impairment for debt securities include, but are not limited to, the intent of management to sell the security, the likelihood that the Company will be required to sell the security before recovering its cost, and management's expectation to recover the entire amortized cost basis of the security even if there is no intent to sell the security.

Fair Value Of Financial Instruments

Fair Value of Financial Instruments

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The fair value hierarchy describes three levels of inputs that may be used by the Company to measure fair value:

Level 1 – Quoted prices in active markets for identical assets or liabilities without adjustment. The Company's Level 1 assets primarily include investments in mutual funds sponsored by SEI and LSV that are quoted daily.

Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company's Level 2 assets primarily include securities issued by the Government National Mortgage Association (GNMA) and other U.S. government agency securities that are single issuer pools that are valued based on current market data for the specific issue owned or pools of similar securities. The Company uses a pricing vendor to value its GNMA securities. The pricing vendor uses a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data for similar pools of GNMA securities.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, or similar techniques, as well as instruments for which the determination of fair value requires significant judgment by management. The Company's Level 3 financial assets primarily include structured investment vehicles (SIV) securities and any change in fair value for these securities is recognized in the current period.

The fair value of an asset or liability may include inputs from more than one level in the fair value hierarchy. The lowest level of significant inputs used to value the asset or liability determines which level the asset or liability is classified in its entirety.

See Note 5 for information on related disclosures regarding fair value measurements

Capitalized Software

Capitalized Software

Costs incurred for the development of internal use software to be offered in a hosting arrangement is capitalized during the development stage of the software application. These costs include direct external and internal costs to design the software configuration and interfaces, coding, installation, and testing. Costs incurred during the preliminary and post-implementation stages of the software application are expensed as incurred. Costs associated with significant enhancements to a software application are capitalized while costs incurred to maintain existing software applications are expensed as incurred. The capitalization of software development costs requires considerable judgment by management with respect to certain external factors, including, but not limited to, technological and economic feasibility, and estimated economic life. Capitalized software development costs in 2011, 2010 and 2009 primarily relate to the further development of the Global Wealth Platform (GWP). The initial version of GWP was placed into service in July 2007. Further enhancements and upgrades will continue to occur through a series of releases. As of December 31, 2011, the net book value of GWP was $296,687, net of accumulated amortization of $87,762. Capitalized software development costs in-progress at December 31, 2011 associated with future releases to GWP were $11,552. The Company capitalized $40,954, $38,729, and $43,944 of software development costs during 2011, 2010, and 2009, respectively.

Amortization of capitalized software development costs begins when the product is ready for its intended use. Capitalized software development costs are amortized on a product-by-product basis using the straight-line method over the estimated economic life of the product or enhancement, which is primarily 3 to 15 years, with a weighted average remaining life of approximately 10.5 years. Amortization expense was $26,153, $23,053, and $35,894 in 2011, 2010, and 2009, respectively, and is included in Amortization expense on the accompanying Consolidated Statements of Operations. GWP has an estimated useful life of 15 years and a weighted average remaining life of 10.5 years. The Company abandoned certain components within GWP that were replaced in late 2009. The useful life of these components was shortened so that the remaining net book value of $15,502 was fully amortized commensurate with the new release. Amortization expense in 2009 on the Consolidated Statements of Operations includes $15,502 of accelerated amortization for these components.

The Company evaluates the carrying value of capitalized software development costs when circumstances indicate the carrying value may not be recoverable. The review of capitalized software development costs for impairment requires significant assumptions about operating strategies, underlying technologies utilized, and external market factors. External market factors include, but are not limited to, expected levels of competition, barriers to entry by potential competitors, stability in the target market and governmental regulations. In 2011 and 2010, the Company determined that no events or change in circumstances had occurred that would indicate that capitalized software development costs were impaired. Therefore, the Company did not  recognize any impairment charges for any of its capitalized software development costs in 2011 or 2010.

Income Taxes

Income Taxes

The Company applies the asset and liability approach to account for income taxes whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The components of the deferred tax assets and liabilities are individually classified as current and non-current based on their characteristics.

Foreign Currency Translation

Foreign Currency Translation

The assets and liabilities and results of operations of the Company's foreign subsidiaries are measured using the foreign subsidiary's local currency as the functional currency. Assets and liabilities have been translated into U.S. dollars using the rates of exchange at the balance sheet dates. The results of operations have been translated into U.S. dollars at average exchange rates prevailing during the period. The resulting translation gain and loss adjustments are recorded as a separate component of comprehensive income.

Transaction gains and losses that arise from exchange rate fluctuations are included in the results of operations in the periods in which they occur, and are immaterial for each of the years in the three year period ended December 31, 2011.

Earnings Per Common Share

Earnings Per Common Share

Basic earnings per common share is computed by dividing net income attributable to SEI Investments common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per common share is computed by dividing net income attributable to SEI Investments common shareholders by the combination of the weighted average number of common shares outstanding and the dilutive potential common shares, such as stock options, outstanding during the period. The calculations of basic and diluted earnings per share for 2011, 2010, and 2009 are:

	For the Year ended December 31, 2011
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	204,959		182,547	$	1.12
Dilutive effect of stock options		0		1,580
Diluted earnings per common share	$	204,959		184,127	$	1.11

	For the Year ended December 31, 2010
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	231,687		188,468	$	1.23
Dilutive effect of stock options		0		1,853
Diluted earnings per common share	$	231,687		190,321	$	1.22

	For the Year ended December 31, 2009
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	174,335		190,821	$	0.91
Dilutive effect of stock options		0		962
Diluted earnings per common share	$	174,335		191,783	$	0.91

Employee stock options to purchase approximately 15,914,000, 13,181,000, and 22,997,000 shares of common stock, with an average exercise price per share of $23.07, $23.79, and $21.47, were outstanding during 2011, 2010, and 2009, respectively, but not included in the computation of diluted earnings per common share because the option's exercise price was greater than the average market price of the Company's common stock and the effect on diluted earnings per common share would have been anti-dilutive (See Note 8).

Stock-Based Compensation

Stock-Based Compensation

Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which is the vesting period. The Company uses historical data to estimate pre-vesting forfeitures and record stock-based compensation expense only for those awards that are expected to vest. The amount of stock-based compensation expense that is recognized in a given period is dependent upon management's estimate of when the vesting targets are expected to be achieved. If this estimate proves to be inaccurate, the remaining amount of stock-based compensation expense could be accelerated, spread out over a longer period, or reversed (See Note 8).

New Accounting Pronouncements

        New Accounting Pronouncements

In May 2011, the Financial Accounting Standards Board (FASB) issued a final Accounting Standards Update which represents the converged guidance of the FASB and the International Accounting Standards Board on fair value measurement. The guidance clarifies how a principal market is determined, addresses the fair value measurement of instruments with offsetting market or counterparty credit risks, addresses the concept of valuation premise and highest and best use, extends the prohibition on blockage factors to all three levels of the fair value hierarchy and requires additional disclosures. The guidance is effective for interim and annual periods beginning after December 15, 2011 and is applied prospectively. The Company does not expect the adoption of the guidance to have a significant impact on its consolidated financial statements.

In June 2011, the FASB issued a final Accounting Standards Update to amend the presentation of comprehensive income in financial statements. This new guidance allows companies the option to present other comprehensive income in either a single continuous statement or in two separate but consecutive statements. Under both alternatives, companies will be required to present each component of net income and comprehensive income. The guidance is effective for interim and annual periods beginning after December 15, 2011 and is applied retrospectively. The Company does not expect the adoption of the guidance to have any impact on its consolidated financial statements.

Reclassifications

        Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation.

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Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 securities	Dec. 31, 2009
Schedule of Available-for-sale Securities [Line Items]
Net unrealized holding gains	$ 2,574	$ 1,339
Unrealized holding gains during the period, income tax expense	1,518	784
Available-for-sale securities, gross realized gains	255	184	440
Available-for-sale securities, gross realized losses			123
Investments held, number of mutual funds			two
Net gain (loss) from investments	3,360	48,533	(4,926)
Number of SIV securities sold		3
Investment in LSV-sponsored funds, cost value	2,049
Investment in LSV-sponsored funds, fair value	3,702
Securities owned	20,949	0
SEI Private Trust Company [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt maturity, minimum	2020
Debt maturity, maximum	2041
U.S. Government Agency And Commercial Paper Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt maturity, maximum	one year
SIV Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Net gain from SIV securities	3,390	44,247
Gains from cash payments received from SIV securities	10,614	27,510
Gains or losses from increase/decrease in fair value of SIV securities	(7,224)	16,460
Three SIV securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cumulative losses from SIV securities		17,944
Net gain from SIV securities		277
Investments Impairment Charge [Member]
Schedule of Available-for-sale Securities [Line Items]
Net gain (loss) from investments			$ 901

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Investments In Unconsolidated Affiliate (Unaudited Proforma Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2009
Investment In Unconsolidated Affiliate [Abstract]
Revenues	$ 848,587
Expenses	(658,434)
Income from operations	190,153
Other income, net	87
Equity in the earnings of unconsolidated affiliate	75,415
Net income before income taxes	265,655
Income taxes	89,886
Net income	175,769
Less: Net income attributable to the noncontrolling interest	(1,434)
Net income attributable to SEI Investments	$ 174,335

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Business Segment Information (Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Segment Reporting Information [Line Items]
Total operating profit from segments above	$ 245,843		$ 256,783		$ 300,627
Corporate overhead expenses	(43,398)		(40,715)		(36,529)
Noncontrolling interest reflected in segments	1,620		1,465		106,905
Income from operations	204,065		217,533		363,707
LSV Employee Group [Member]
Segment Reporting Information [Line Items]
LSV Employee Group expenses	0	[1]	0	[1]	(7,296)	[1]
Amortization expense related to intangible assets					$ 7,222

[1] Includes $7,222 in 2009 of amortization expense related to intangible assets.

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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Capitalized software, accumulated amortization	$ 117,100	$ 90,947
Capitalized software development costs for software sold to customers during period	40,954	38,729	43,944
Capitalized software, weighted average remaining life, years	10.5
Amortization expense related to capitalized software	26,153	23,053	35,894
Impairment charges for capitalized software development costs	0	0
Anti-dilutive employee stock options	15,914,000	13,181,000	22,997,000
Average exercise price of anti-dilutive employee stock options	$ 23.07	$ 23.79	$ 21.47
SEI Investments (Europe) Limited [Member]
Property, Plant and Equipment [Line Items]
Restricted cash	5,000	3,000
SEI Investments Distribution Co (SIDCO) [Member]
Property, Plant and Equipment [Line Items]
Restricted cash	1,000	1,000
Global Wealth Platform [Member]
Property, Plant and Equipment [Line Items]
Net book value of GWP	296,687
Capitalized software, accumulated amortization	87,762
Capitalized software development costs in-progress associated with future releases	11,552
Software development cost useful life, years	15
Capitalized software, weighted average remaining life, years	10.5
Accelerated amortization for GWP abandoned components			15,502
Net book value GWP components abandoned			15,502
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Property, Plant and Equipment [Line Items]
Investment in money market mutual funds at carrying value	$ 281,760	$ 383,946
Maximum [Member]
Property, Plant and Equipment [Line Items]
Software development cost useful life, years	15
Minimum [Member]
Property, Plant and Equipment [Line Items]
Software development cost useful life, years	3
Building And Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life of property and equipment, minimum number of years	25
Useful life of property and equipment, maximum number of years	39
Equipment, Purchased Software And Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful life of property and equipment, minimum number of years	3
Useful life of property and equipment, maximum number of years	5

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Marketable Securities (Trading Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Gain (Loss) on Investments [Line Items]
Trading Securities, Cost	$ 149,627	$ 233,075
Trading Securities, Gross Unrealized Gains	1,653	1,900
Trading Securities, Gross Unrealized Losses	(94,955)	(130,381)
Trading Securities, Fair Value	56,325	104,594
SIV Securities [Member]
Gain (Loss) on Investments [Line Items]
Trading Securities, Cost	146,363	231,026
Trading Securities, Gross Unrealized Gains	0	0
Trading Securities, Gross Unrealized Losses	(94,955)	(130,381)
Trading Securities, Fair Value	51,408	100,645
LSV-Sponsored Mutual Funds [Member]
Gain (Loss) on Investments [Line Items]
Trading Securities, Cost	2,049	2,049
Trading Securities, Gross Unrealized Gains	1,653	1,900
Trading Securities, Gross Unrealized Losses	0	0
Trading Securities, Fair Value	3,702	3,949
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
Trading Securities, Cost	1,215
Trading Securities, Gross Unrealized Gains	0
Trading Securities, Gross Unrealized Losses	0
Trading Securities, Fair Value	$ 1,215

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Income Taxes (Components Of Net Income Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Domestic	$ 309,391	$ 360,937	$ 255,390
Foreign	6,852	6,795	8,300
Net Income Before Income	$ 316,243	$ 367,732	$ 263,690

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Shareholders' Equity (Reconciliation Of Noncontrolling Interest On The Consolidated Statements Of Changes In Equity) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Beginning balance	$ 15,155	$ 121,895	$ 109,722
Less: Net income attributable to noncontrolling interest	1,691	1,633	98,097
Foreign currency translation adjustments	(703)	685	1,797
Distributions to noncontrolling interests	0	0	(87,337)
Other	0	0	(384)
Ending balance	16,143	15,155	121,895
LSV [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Decrease from Deconsolidation	0	(65,522)	0
LSV Employee Group [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Noncontrolling Interest, Decrease from Deconsolidation	$ 0	$ (43,536)	$ 0

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Fair Value Measurements (Narrative) (Details) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities	$ 0	$ 0
Transfers of financial assets between levels within the fair value hierarchy	$ 0	$ 0

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Summary Of Significant Accounting Policies

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies [Abstract]

Summary Of Significant Accounting Policies

Note 1 – Summary of Significant Accounting Policies:

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations solutions to corporations, financial institutions, financial advisors, and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe, and other various locations throughout the world. Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing solutions are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, except for fees earned associated with trade execution services.

Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations solutions offer investment managers support for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. These solutions also provide support to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas. Revenues from investment operations solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Principles of Consolidation

The Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries and entities in which it holds a controlling financial interest. The Company determines whether it has a controlling financial interest either by its decision-making ability through voting interests or by the extent of the Company's participation in the economic risks and rewards of the entity through variable interests. The Company accounts for noncontrolling interests in consolidated entities for which the Company's controlling financial interest is less than 100 percent. The Company's principal subsidiaries are SEI Investments Distribution Co. (SIDCO), SEI Investments Management Corporation (SIMC), SEI Private Trust Company (SPTC), SEI Trust Company (STC), SEI Global Services, Inc. (SGSI) and SEI Investments (Europe) Limited (SIEL). All intercompany accounts and transactions have been eliminated.

In January 2010, new accounting guidance pertaining to the consolidation of VIEs became effective. Under the new guidance, the Company was not considered the primary beneficiary of LSV Employee Group (See Note 2). The Company, therefore, discontinued consolidating the accounts and operations of LSV Asset Management (LSV) and LSV Employee Group in its financial statements. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company's interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheet and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statement of Operations. The deconsolidation of LSV had no effect on Net income attributable to SEI. Prior period financial statements are not reclassified for the new accounting guidance.

Noncontrolling interest on the accompanying Consolidated Balance Sheets includes the interest of other shareholders in a joint venture of the Company in an asset management firm located in South Korea.

        Variable Interest Entities

The Company has involvement with various variable interest entities (VIE or VIEs). These VIEs consist of LSV Employee Group and investment products established for clients created in the form of various types of legal entity structures. In June 2009, the Financial Accounting Standards Board (FASB) issued guidance related to the consolidation of VIEs. This guidance changed how a company determines when an entity that is insufficiently capitalized or is not controlled through voting common stock should be consolidated. The determination of whether a company is required to consolidate an entity is based on, among other things, an entity's purpose and design, a company's ability to direct the activities of the entity that most significantly impact the entity's economic performance, and whether a company is obligated to absorb losses or receive benefits that could be potentially significant to the entity. The guidance requires ongoing reassessments of whether an enterprise is the primary beneficiary of a VIE and requires disclosures about an enterprises involvement in VIEs.

Under the new guidance, LSV Employee Group remains a VIE. However, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group either directly or through any financial responsibility from the Guaranty Agreement. As of January 1, 2010, the Company discontinued consolidating the accounts of LSV Employee Group. The Company does not have any direct equity interest in LSV Employee Group.

In January 2010, the FASB deferred the new guidance for certain types of investment entities. The deferral allows asset managers that have no obligation to fund potentially significant losses of an investment entity to continue to apply the previous guidance to investment entities that have attributes of entities defined in the "Investment Company Guide." The deferral applies to many mutual funds, hedge funds, private equity funds, venture capital and certain other types of entities. Also, money market funds subject to rule 2a-7 of the Investment Company Act of 1940 qualify for deferral. However, the deferral does not apply to the new disclosure requirements. All of the Company's investment products where the Company is the sponsor and/or investment manager that are VIEs qualify for the deferral; therefore, the Company will continue to apply the previous guidance for the consolidation of VIEs (See Note 3).

Management's Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Revenue Recognition

The Company's principal sources of revenues are: (1) asset management, administration and distribution fees earned based upon a contractual percentage of net assets under management or administration; (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or non-recurring and based upon project-oriented contractual agreements related to client implementations; and (3) transaction-based fees for providing trade-execution services. The majority of the Company's revenues are based on contractual arrangements. Revenues are recognized in the periods in which the related services are performed provided that persuasive evidence of an agreement exists, the fee is fixed or determinable, and collectibility is reasonably assured. Cash received by the Company in advance of the performance of services is deferred and recognized as revenue when earned. Reimbursements received for out-of-pocket expenses incurred are recorded as revenue. Certain portions of the Company's revenues require management's consideration of the nature of the client relationship in determining whether to recognize as revenue the gross amount billed or net amount retained after payments are made to suppliers for certain services related to the product or service offering.

Cash and Cash Equivalents

The Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents include $281,760 and $383,946 at December 31, 2011 and 2010, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds.

Restricted Cash

Restricted cash includes $5,000 and $3,000 at December 31, 2011 and 2010, respectively, segregated for regulatory purposes related to trade-execution services conducted by SIEL. Restricted cash also includes $1,000 at December 31, 2011 and 2010 segregated in special reserve accounts for the benefit of SIDCO customers in accordance with certain rules established by the Securities and Exchange Commission for broker-dealers.

Allowances for Doubtful Accounts

The Company provides an allowance for doubtful accounts equal to the estimated uncollectible amounts. The Company's estimate is based on historical collection experience and a review of the current status of trade accounts receivable.

Concentration of Credit Risk

Financial instruments which potentially expose the Company to concentrations of credit risk consist primarily of cash equivalents and trade receivables. Cash equivalents are principally invested in short-term money market funds or placed with major banks and high-credit qualified financial institutions. Cash deposits maintained with institutions are in excess of federally insured limits. Concentrations of credit risk with respect to our receivables are limited due to the large number of clients and their dispersion across geographic areas. No single group or customer represents greater than ten percent of total accounts receivable.

Property and Equipment

Property and Equipment are recorded at cost. Expenditures for major additions and improvements are capitalized and minor replacements, maintenance, and repairs are charged to expense as incurred. Construction in progress includes the cost of construction and other direct costs attributable to the construction. When property and equipment are retired or disposed of, the related cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is included in the results of operations for the respective period. Depreciation is provided over the estimated useful lives using the straight line method for financial statement purposes. No provision for depreciation is made for construction in progress until such time as the relevant assets are completed and put into service. The Company uses other depreciation methods, generally accelerated, for tax purposes where appropriate. Buildings and building improvements are depreciated over 25 to 39 years. Equipment, purchased software and furniture and fixtures have useful lives ranging from three to five years. Amortization of leasehold improvements is computed using the straight line method over the shorter of the remaining lease term or the estimated useful lives of the improvements

Marketable Securities

The classification of investments in marketable securities is determined at the time of purchase and reevaluated at each balance sheet date. Debt and equity securities classified as available-for-sale are reported at fair value as determined by the most recently traded price of each security at the balance sheet date. Unrealized gains and losses, net of income taxes, are reported as a separate component of comprehensive income. SIDCO, the Company's broker-dealer subsidiary, reports changes in fair value of marketable securities through current period earnings due to specialized accounting practices related to investments by broker-dealers. The Company records all of its trading securities on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these securities are recognized in current period earnings. The specific identification method is used to compute the realized gains and losses on all of the Company's marketable securities (See Note 6).

The Company evaluates the realizable value of its marketable securities on a quarterly basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis for the investment is established. Some of the factors considered in determining other-than-temporary impairment for equity securities include, but are not limited to, significant or prolonged declines in the fair value of the investments, the Company's ability and intent to retain the investment for a period sufficient to allow the value to recover, and the financial condition of the investment. Some of the factors considered in determining other-than-temporary impairment for debt securities include, but are not limited to, the intent of management to sell the security, the likelihood that the Company will be required to sell the security before recovering its cost, and management's expectation to recover the entire amortized cost basis of the security even if there is no intent to sell the security.

Fair Value of Financial Instruments

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The fair value hierarchy describes three levels of inputs that may be used by the Company to measure fair value:

Level 1 – Quoted prices in active markets for identical assets or liabilities without adjustment. The Company's Level 1 assets primarily include investments in mutual funds sponsored by SEI and LSV that are quoted daily.

Level 2 – Observable inputs other than Level 1 prices, such as quoted prices for similar assets, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company's Level 2 assets primarily include securities issued by the Government National Mortgage Association (GNMA) and other U.S. government agency securities that are single issuer pools that are valued based on current market data for the specific issue owned or pools of similar securities. The Company uses a pricing vendor to value its GNMA securities. The pricing vendor uses a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data for similar pools of GNMA securities.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, or similar techniques, as well as instruments for which the determination of fair value requires significant judgment by management. The Company's Level 3 financial assets primarily include structured investment vehicles (SIV) securities and any change in fair value for these securities is recognized in the current period.

The fair value of an asset or liability may include inputs from more than one level in the fair value hierarchy. The lowest level of significant inputs used to value the asset or liability determines which level the asset or liability is classified in its entirety.

See Note 5 for information on related disclosures regarding fair value measurements

Capitalized Software

Costs incurred for the development of internal use software to be offered in a hosting arrangement is capitalized during the development stage of the software application. These costs include direct external and internal costs to design the software configuration and interfaces, coding, installation, and testing. Costs incurred during the preliminary and post-implementation stages of the software application are expensed as incurred. Costs associated with significant enhancements to a software application are capitalized while costs incurred to maintain existing software applications are expensed as incurred. The capitalization of software development costs requires considerable judgment by management with respect to certain external factors, including, but not limited to, technological and economic feasibility, and estimated economic life. Capitalized software development costs in 2011, 2010 and 2009 primarily relate to the further development of the Global Wealth Platform (GWP). The initial version of GWP was placed into service in July 2007. Further enhancements and upgrades will continue to occur through a series of releases. As of December 31, 2011, the net book value of GWP was $296,687, net of accumulated amortization of $87,762. Capitalized software development costs in-progress at December 31, 2011 associated with future releases to GWP were $11,552. The Company capitalized $40,954, $38,729, and $43,944 of software development costs during 2011, 2010, and 2009, respectively.

Amortization of capitalized software development costs begins when the product is ready for its intended use. Capitalized software development costs are amortized on a product-by-product basis using the straight-line method over the estimated economic life of the product or enhancement, which is primarily 3 to 15 years, with a weighted average remaining life of approximately 10.5 years. Amortization expense was $26,153, $23,053, and $35,894 in 2011, 2010, and 2009, respectively, and is included in Amortization expense on the accompanying Consolidated Statements of Operations. GWP has an estimated useful life of 15 years and a weighted average remaining life of 10.5 years. The Company abandoned certain components within GWP that were replaced in late 2009. The useful life of these components was shortened so that the remaining net book value of $15,502 was fully amortized commensurate with the new release. Amortization expense in 2009 on the Consolidated Statements of Operations includes $15,502 of accelerated amortization for these components.

The Company evaluates the carrying value of capitalized software development costs when circumstances indicate the carrying value may not be recoverable. The review of capitalized software development costs for impairment requires significant assumptions about operating strategies, underlying technologies utilized, and external market factors. External market factors include, but are not limited to, expected levels of competition, barriers to entry by potential competitors, stability in the target market and governmental regulations. In 2011 and 2010, the Company determined that no events or change in circumstances had occurred that would indicate that capitalized software development costs were impaired. Therefore, the Company did not  recognize any impairment charges for any of its capitalized software development costs in 2011 or 2010.

Income Taxes

The Company applies the asset and liability approach to account for income taxes whereby deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The components of the deferred tax assets and liabilities are individually classified as current and non-current based on their characteristics.

Foreign Currency Translation

The assets and liabilities and results of operations of the Company's foreign subsidiaries are measured using the foreign subsidiary's local currency as the functional currency. Assets and liabilities have been translated into U.S. dollars using the rates of exchange at the balance sheet dates. The results of operations have been translated into U.S. dollars at average exchange rates prevailing during the period. The resulting translation gain and loss adjustments are recorded as a separate component of comprehensive income.

Transaction gains and losses that arise from exchange rate fluctuations are included in the results of operations in the periods in which they occur, and are immaterial for each of the years in the three year period ended December 31, 2011.

Earnings Per Common Share

Basic earnings per common share is computed by dividing net income attributable to SEI Investments common shareholders by the weighted average number of common shares outstanding during the period. Diluted earnings per common share is computed by dividing net income attributable to SEI Investments common shareholders by the combination of the weighted average number of common shares outstanding and the dilutive potential common shares, such as stock options, outstanding during the period. The calculations of basic and diluted earnings per share for 2011, 2010, and 2009 are:

	For the Year ended December 31, 2011
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	204,959		182,547	$	1.12
Dilutive effect of stock options		0		1,580
Diluted earnings per common share	$	204,959		184,127	$	1.11

	For the Year ended December 31, 2010
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	231,687		188,468	$	1.23
Dilutive effect of stock options		0		1,853
Diluted earnings per common share	$	231,687		190,321	$	1.22

	For the Year ended December 31, 2009
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	174,335		190,821	$	0.91
Dilutive effect of stock options		0		962
Diluted earnings per common share	$	174,335		191,783	$	0.91

Employee stock options to purchase approximately 15,914,000, 13,181,000, and 22,997,000 shares of common stock, with an average exercise price per share of $23.07, $23.79, and $21.47, were outstanding during 2011, 2010, and 2009, respectively, but not included in the computation of diluted earnings per common share because the option's exercise price was greater than the average market price of the Company's common stock and the effect on diluted earnings per common share would have been anti-dilutive (See Note 8).

Stock-Based Compensation

Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which is the vesting period. The Company uses historical data to estimate pre-vesting forfeitures and record stock-based compensation expense only for those awards that are expected to vest. The amount of stock-based compensation expense that is recognized in a given period is dependent upon management's estimate of when the vesting targets are expected to be achieved. If this estimate proves to be inaccurate, the remaining amount of stock-based compensation expense could be accelerated, spread out over a longer period, or reversed (See Note 8).

        New Accounting Pronouncements

In May 2011, the Financial Accounting Standards Board (FASB) issued a final Accounting Standards Update which represents the converged guidance of the FASB and the International Accounting Standards Board on fair value measurement. The guidance clarifies how a principal market is determined, addresses the fair value measurement of instruments with offsetting market or counterparty credit risks, addresses the concept of valuation premise and highest and best use, extends the prohibition on blockage factors to all three levels of the fair value hierarchy and requires additional disclosures. The guidance is effective for interim and annual periods beginning after December 15, 2011 and is applied prospectively. The Company does not expect the adoption of the guidance to have a significant impact on its consolidated financial statements.

In June 2011, the FASB issued a final Accounting Standards Update to amend the presentation of comprehensive income in financial statements. This new guidance allows companies the option to present other comprehensive income in either a single continuous statement or in two separate but consecutive statements. Under both alternatives, companies will be required to present each component of net income and comprehensive income. The guidance is effective for interim and annual periods beginning after December 15, 2011 and is applied retrospectively. The Company does not expect the adoption of the guidance to have any impact on its consolidated financial statements.

        Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation.

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Accumulated Comprehensive Income (Loss) (Accumulated Comprehensive Income (Loss), Net Of Tax) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Accumulated other comprehensive income (loss), foreign currency translation adjustments	$ (674)	$ 1,818	$ 298	$ (6,639)
Accumulated other comprehensive income (loss), unrealized holding gains (losses) on investments	2,574	1,339	960	(1,524)
Accumulated other comprehensive income (loss)	1,900	3,157	1,258	(8,163)
Total comprehensive loss, foreign currency translation adjustments	(3,195)	2,205	8,734
Total comprehensive income (loss)	(1,960)	2,584	11,218
Total comprehensive loss, foreign currency translation adjustments, attributable to noncontrolling interest	(703)	685	1,797
Total comprehensive (loss) income, foreign currency translation adjustments, attributable to SEI Investments Company	(2,492)	1,520	6,937
Total comprehensive (loss) income, unrealized holding gains (losses) on investments, attributable to SEI Investments Company	1,235	379	2,484
Total comprehensive (loss) income, attributable to SEI Investments Company	(1,257)	1,899	9,421
SEI Investments Company [Member]
Accumulated other comprehensive income (loss), foreign currency translation adjustments	(2,043)	1,152	(1,053)	(9,787)
Accumulated other comprehensive income (loss), unrealized holding gains (losses) on investments	2,574	1,339	960	(1,524)
Accumulated other comprehensive income (loss)	531	2,491	(93)	(11,311)
Total comprehensive loss, foreign currency translation adjustments	(3,195)	2,205	8,734
Total comprehensive loss, unrealized holding gains (losses) on investments	1,235	379	2,484
Total comprehensive income (loss)	(1,960)	2,584	11,218
Noncontrolling Interest [Member]
Accumulated other comprehensive income (loss), foreign currency translation adjustments	1,369	666	1,351	3,148
Accumulated other comprehensive income (loss), unrealized holding gains (losses) on investments	0	0	0	0
Accumulated other comprehensive income (loss)	1,369	666	1,351	3,148
Total comprehensive loss, foreign currency translation adjustments, attributable to noncontrolling interest	703	(685)	(1,797)
Total comprehensive loss, unrealized holding gains (losses) on investments, attributable to noncontrolling interest	0	0	0
Total comprehensive loss, attributable to noncontrolling interest	$ 703	$ (685)	$ (1,797)

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Variable Interest Entities - Investment Products (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011
Variable Interest Entities - Investment Products [Abstract]
Percentage not approached by expected return on any VIE investment	50.00%

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Of Certain Financial Assets And Liabilities

			At December 31, 2011
			Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	8,010	$	8,010	$	0	$	0
Fixed-income available-for-sale securities		74,998		0		74,998		0
Fixed income securities owned		20,949		0		20,949		0
Trading securities		56,325		3,702		0		52,623
	$	160,282	$	11,712	$	95,947	$	52,623

			At December 31, 2010
			Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	5,853	$	5,853	$	0	$	0
Fixed-income available-for-sale securities		68,917		0		68,917		0
Trading securities		104,594		3,949		0		100,645
	$	179,364	$	9,802	$	68,917	$	100,645

Reconciliation For All Assets And Liabilities Company Measured At Fair Value On Recurring Basis Using Significant Unobservable Inputs (Level 3)

	Trading Securities
Balance, January 1, 2010	$	120,714
Purchases		536
Issuances		0
Principal prepayments and settlements		(45,857	)
Sales		(18,995	)
Total gains or (losses) (realized/unrealized):
Included in earnings		44,247
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance, December 31, 2010	$	100,645
Purchases		1,215
Issuances		0
Principal prepayments and settlements		(17,921	)
Sales		(34,706	)
Total gains or (losses) (realized/unrealized):
Included in earnings		3,390
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance, December 31, 2011	$	52,623

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Composition Of Certain Financial Statement Captions (Tables)

12 Months Ended

Dec. 31, 2011

Composition Of Certain Financial Statement Captions [Abstract]

Receivables

	2011			2010
Trade receivables	$	37,822		$	34,528
Fees earned, not billed		92,916			93,506
Other receivables		12,295			9,651
		143,033			137,685
Less: Allowance for doubtful accounts		(924	)		(1,195	)
Receivables, net	$	142,109		$	136,490

Property And Equipment

	2011			2010
Buildings	$	136,949		$	135,935
Equipment		64,256			63,902
Land		9,929			9,890
Purchased software		77,971			74,720
Furniture and fixtures		17,999			18,566
Leasehold improvements		4,558			4,250
Construction in progress		339			121
		312,001			307,384
Less: Accumulated depreciation		(182,453	)		(166,816	)
Property and Equipment, net	$	129,548		$	140,568

Accrued Liabilities

	2011		2010
Accrued employee compensation	$	48,112	$	43,747
Accrued employee benefits and other personnel		5,408		6,988
Accrued consulting, outsourcing and professional fees		17,477		16,390
Accrued brokerage fees		8,665		11,942
Accrued sub-advisory, distribution and other asset management fees		17,091		16,778
Accrued income taxes		0		2,077
Accrued dividend payable		26,518		0
Other accrued liabilities		23,773		23,488
Accrued liabilities	$	147,044	$	121,410

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Shareholders' Equity (Stock-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Shareholders' Equity [Abstract]
Stock-based compensation expense	$ 14,112	$ 26,783	$ 14,503
Less: Deferred tax benefit	(5,332)	(10,068)	(4,636)
Stock-based compensation expense, net of tax	$ 8,780	$ 16,715	$ 9,867

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Composition Of Certain Financial Statement Captions (Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Composition Of Certain Financial Statement Captions [Abstract]
Trade receivables	$ 37,822	$ 34,528
Fees earned, not billed	92,916	93,506
Other receivables	12,295	9,651
Gross receivables	143,033	137,685
Less: Allowance for doubtful accounts	(924)	(1,195)
Receivables, net	$ 142,109	$ 136,490

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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Investments Available For Sale

	For the Year ended December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	8,243	$	48	$	(360	)	$	7,931
Other mutual funds		69		10		0			79
Debt securities		70,604		4,394		0			74,998
	$	78,916	$	4,452	$	(360	)	$	83,008
	For the Year Ended December 31, 2010
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	5,086	$	279	$	(14	)	$	5,351
Other mutual funds		443		59		0			502
Debt securities		67,118		1,799		0			68,917
	$	72,647	$	2,137	$	(14	)	$	74,770

Trading Securities

	For the Year ended December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	146,363	$	0	$	(94,955	)	$	51,408
LSV-sponsored mutual funds		2,049		1,653		0			3,702
Other investments		1,215		0		0			1,215
	$	149,627	$	1,653	$	(94,955	)	$	56,325
	For the Year ended December 31, 2010
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	231,026	$	0	$	(130,381	)	$	100,645
LSV-sponsored mutual funds		2,049		1,900		0			3,949
	$	233,075	$	1,900	$	(130,381	)	$	104,594

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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Shareholders' Equity [Abstract]

Assumptions Used In The Weighted Average Fair Value Of The Stock Options Granted

	2011			2010			2009
Expected term (in years)		7.65			7.45			7.49
Expected volatility		40.43	%		36.35	%		37.44	%
Expected dividend yield		1.90	%		0.84	%		1.02	%
Risk-free interest rate		1.66	%		3.01	%		3.31	%

Stock-Based Compensation Expense

	2011			2010			2009
Stock-based compensation expense	$	14,112		$	26,783		$	14,503
Less: Deferred tax benefit		(5,332	)		(10,068	)		(4,636	)
Stock-based compensation expense, net of tax	$	8,780		$	16,715		$	9,867

Schedule Of Recognition Of Compensation Cost

Period	Stock-Based Compensation Expense
2012	$	14,398
2013		12,704
2014		12,510
2015		3,846
2016		2,355
2017		2,310
	$	48,123

Stock Option Plans

	Number of Shares			Weighted Avg. Price
Balance as of December 31, 2008		28,883,000		$	19.90
Granted		4,222,000			17.66
Exercised		(2,055,000	)		10.53
Expired or canceled		(2,086,000	)		21.87
Balance as of December 31, 2009		28,964,000		$	20.09
Granted		2,883,000			23.84
Exercised		(1,633,000	)		16.04
Expired or canceled		(2,333,000	)		23.68
Balance as of December 31, 2010		27,881,000		$	20.42
Granted		2,534,000			15.77
Exercised		(1,364,000	)		16.37
Expired or canceled		(2,008,000	)		22.07
Balance as of December 31, 2011		27,043,000		$	20.06
Exercisable as of December 31, 2011		11,680,000		$	17.22
Available for future grant as of December 31, 2011		4,622,000

Stock Options Outstanding And Exercisable

	Options Outstanding at December 31, 2011						Options Exercisable at December 31, 2011
Range of Exercise Prices (Per Share)	Number of Shares		Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Life (Years)		Number of Shares		Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Life (Years)
$14.05 – 14.71		5,285,000	$	14.65		5.28		3,296,000	$	14.66		4.24
14.78 – 17.35		5,179,000		15.30		6.00		2,642,000		14.84		2.17
17.65 – 19.28		6,560,000		18.33		6.33		3,165,000		18.32		6.37
19.53 – 23.86		5,375,000		22.75		6.13		2,562,000		21.55		3.00
27.03 – 32.49		4,644,000		30.88		5.46		15,000		27.03		5.00
		27,043,000						11,680,000

Shares Repurchased And The Related Total Costs

Year	Total Number of Shares Repurchased		Total Cost
2011		11,109,000	$	211,165
2010		5,814,000		120,982
2009		3,198,000		54,114

Reconciliation Of Noncontrolling Interest On The Consolidated Statements Of Changes In Equity

Year Ended December 31,	2011			2010			2009
Noncontrolling interest
Beginning balance	$	15,155		$	121,895		$	109,722
Net income attributable to noncontrolling interest		1,691			1,633			98,097
Foreign currency translation adjustments		(703	)		685			1,797
Deconsolidation of LSV		0			(65,522	)		0
Deconsolidation of LSV Employee Group		0			(43,536	)		0
Distributions to noncontrolling interests		0			0			(87,337	)
Other		0			0			(384	)
Ending balance	$	16,143		$	15,155		$	121,895

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 206,650		$ 233,320		$ 272,432
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	27,288		24,048		44,608
Depreciation	21,471		21,902		21,531
Equity in earnings of unconsolidated affiliate	(105,818)		(99,457)		0
Cash received from unconsolidated affiliate	109,273		72,060		0
Payments to partners of LSV	0		0		(87,337)
Stock-based compensation	14,112		26,783		14,503
Provision for losses on receivables	(271)		(1,004)		692
Deferred income tax expense	1,001		6,461		67,265
Net realized (gains) losses from investments	(3,360)		(48,533)		178,007
Other-than-temporary declines in market value	0		0		901
Change in other long-term liabilities	2,631		(81)		1,659
Other	(2,833)		2,473		3,508
Decrease (increase) in:
Restricted cash for broker-dealer operations	0		16,000		0
Receivables from regulated investment companies	3,482		(1,148)		230
Receivables	(11,474)		(11,032)		(3,885)
Other current assets	(1,689)		(1,101)		197
Increase (decrease) in:
Accounts payable	(2,583)		1,734		(9,457)
Capital Support Agreements	0		0		(173,983)
Payable to regulated investment companies	0		0		(97)
Accrued liabilities	(1,340)		(13,847)		15,367
Deferred revenue	422		748		(670)
Total adjustments	50,312		(3,994)		73,039
Net cash provided by operating activities	256,962		229,326		345,471
Cash flows from investing activities:
Additions to restricted cash	(2,000)		0		(6,000)
Additions to property and equipment	(12,271)		(13,611)		(19,272)
Additions to capitalized software	(40,954)		(38,729)		(43,944)
Purchases of marketable securities	(73,960)		(39,085)		(322,528)
Prepayments and maturities of marketable securities	61,582		58,174		32,002
Sales of marketable securities	38,247		28,859		20,830
Purchases of other investments	(7,500)		0		0
Sales of other investments	4,906		0		0
LSV and LSV Employee Group cash balances, net	0	[1]	(37,083)	[1]	0	[1]
Net cash used in investing activities	(31,950)		(41,475)		(338,912)
Cash flows from financing activities:
Proceeds from borrowings on long-term debt	0		0		254,000
Payments on long-term debt	(95,000)		(138,000)		(31,980)
Purchase and retirement of common stock	(208,932)		(119,775)		(53,136)
Proceeds from issuance of common stock	24,221		28,096		23,664
Tax benefit on stock options exercised	1,434		1,877		5,725
Payment of dividends	(22,041)		(54,634)		(30,598)
Net cash (used in) provided by financing activities	(300,318)		(282,436)		167,675
Net (decrease) increase in cash and cash equivalents	(75,306)		(94,585)		174,234
Cash and cash equivalents, beginning of year	496,292		590,877		416,643
Cash and cash equivalents, end of year	420,986		496,292		590,877
Interest paid	559		1,488		4,676
Income taxes paid	116,483		145,553		9,052
Non-cash financing activities
Dividends declared but not paid	$ 26,518		$ 0		$ 17,121

[1] Cash balances, net of the partnership distribution payment received in January 2010, of LSV and LSV Employee Group at December 31, 2009 removed due to the deconsolidation of the accounts and operations of LSV and LSV Employee Group in January 2010 (See Note 2).

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Accumulated Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2011

Accumulated Comprehensive Income (Loss) [Abstract]

Accumulated Comprehensive Income (Loss)

	Foreign Currency Translation Adjustments			Unrealized Holding Gains (Losses) On Investments			Accumulated Other Comprehensive Income (Loss)
Total accumulated comprehensive loss at January 1, 2009	$	(9,787	)	$	(1,524	)	$	(11,311	)
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at January 1, 2009		3,148			0			3,148
Total accumulated comprehensive loss attributable to SEI Investments Company at January 1, 2009	$	(6,639	)	$	(1,524	)	$	(8,163	)
Total comprehensive income		8,734			2,484			11,218
Less: Total comprehensive income attributable to noncontrolling interest		(1,797	)		0			(1,797	)
Total comprehensive income attributable to SEI Investments Company	$	6,937		$	2,484		$	9,421
Total accumulated comprehensive income (loss) at December 31, 2009		(1,053	)		960			(93	)
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2009		1,351			0			1,351
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2009	$	298		$	960		$	1,258
Total comprehensive income		2,205			379			2,584
Less: Total comprehensive income attributable to noncontrolling interest		(685	)		0			(685	)
Total comprehensive income attributable to SEI Investments Company	$	1,520		$	379		$	1,899
Total accumulated comprehensive income at December 31, 2010		1,152			1,339			2,491
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2010		666			0			666
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2010	$	1,818		$	1,339		$	3,157
Total comprehensive loss		(3,195	)		1,235			(1,960	)
Less: Total comprehensive loss attributable to noncontrolling interest		703			0			703
Total comprehensive loss attributable to SEI Investments Company	$	(2,492	)	$	1,235		$	(1,257	)
Total accumulated comprehensive income at December 31, 2011		(2,043	)		2,574			531
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011		1,369			0			1,369
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011	$	(674	)	$	2,574		$	1,900

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Investment In Unconsolidated Affiliate (Condensed Statement Of Operations Of LSV) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments in and Advances to Affiliates [Line Items]
Revenues	$ 226,247	$ 233,227	$ 237,760	$ 232,493	$ 231,399	$ 219,513	$ 228,388	$ 221,535	$ 929,727	$ 900,835	$ 1,060,548
Net income	44,396	49,232	53,603	57,728	62,400	56,389	53,478	59,420	204,959	231,687	174,335
Investment In Unconsolidated Affiliate [Member]
Investments in and Advances to Affiliates [Line Items]
Revenues									296,397	273,381
Net income									$ 257,519	$ 239,981

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Lines Of Credit (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 2012 Credit Facility [Member] USD ($)	Dec. 31, 2011 Canadian Subsidiary [Member] CAD
Line of Credit Facility [Line Items]
Credit agreement, years				five
Credit facility	$ 300,000			$ 300,000	2,000
Credit facility, expiration date	July 2012			February 2017
Credit facility, initiation date				February 2, 2012
Credit facility interest accrued, percentage above LIBOR	0.45%			1.25%
Credit facility, commitment fee per annum on daily unused portion, percent	0.09%			0.15%
Aggregate amount that may increase under credit facility				100,000
Credit facility, outstanding balance			254,000
Credit facility, principal payments	95,000	138,000	21,000
Credit facility, average interest rate	0.68%	0.77%	1.05%
Credit facility, interest charges and commitment fee	$ 585	$ 1,478	$ 2,491

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Income Taxes (Unrecognized Tax Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Unrecognized tax benefits, Beginning Balance	$ 5,723	$ 4,989	$ 13,453
Gross additions, current year	2,392	1,372	1,905
Gross reductions, current year	0	0	0
Tax positions related to current year	2,392	1,372	1,905
Gross additions, prior year	1,992	0	0
Gross reductions, prior year	0	(104)	0
Tax positions related to current year	1,992	(104)	0
Settlements	0	(102)	(9,888)
Lapses on statute of limitations	(697)	(432)	(481)
Unrecognized tax benefits, Ending Balance	$ 9,410	$ 5,723	$ 4,989

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 420,986	$ 496,292
Restricted cash	6,000	4,000
Receivables from regulated investment companies	25,800	29,282
Receivables, net of allowance for doubtful accounts of $924 and $1,195 (Note 4)	142,109	136,490
Deferred income taxes, net	1,150	1,387
Securities owned	20,949	0
Other current assets	17,957	16,268
Total Current Assets	634,951	683,719
Property and Equipment, net of accumulated depreciation of $182,453 and $166,816 (Note 4)	129,548	140,568
Capitalized Software, net of accumulated amortization of $117,100 and $90,947	309,133	294,332
Investments Available for Sale (Note 6)	83,008	74,770
Trading Securities (Note 6)	56,325	104,594
Investment in Unconsolidated Affiliate (Note 2)	60,954	64,409
Other Assets, net	20,640	14,831
Total Assets	1,294,559	1,377,223
Current Liabilities:
Accounts payable	1,999	4,582
Accrued liabilities (Note 4)	147,044	121,410
Deferred revenue	2,030	1,608
Total Current Liabilities	151,073	127,600
Long-term Debt (Note 7)	0	95,000
Deferred Income Taxes	93,751	92,253
Other Long-term Liabilities (Note 12)	8,276	5,645
Total Liabilities	253,100	320,498
Commitments and Contingencies (Note 11)
SEI Investments Company shareholders' equity:
Series Preferred stock, $.05 par value, 50 shares authorized; no shares issued and outstanding	0	0
Common stock, $.01 par value, 750,000 shares authorized; 176,506 and 186,141 shares issued and outstanding	1,765	1,861
Capital in excess of par value	577,949	565,393
Retained earnings	443,702	471,159
Accumulated other comprehensive income, net	1,900	3,157
Total SEI Investments Shareholders' Equity	1,025,316	1,041,570
Noncontrolling interest	16,143	15,155
Total Equity	1,041,459	1,056,725
Total liabilities and partners' capital	$ 1,294,559	$ 1,377,223

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Composition Of Certain Financial Statement Captions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Composition Of Certain Financial Statement Captions [Abstract]
Buildings	$ 136,949	$ 135,935
Equipment	64,256	63,902
Land	9,929	9,890
Purchased software	77,971	74,720
Furniture and fixtures	17,999	18,566
Leasehold improvements	4,558	4,250
Construction in progress	339	121
Property and Equipment, gross	312,001	307,384
Less: Accumulated depreciation	(182,453)	(166,816)
Property and Equipment, net	129,548	140,568
Depreciation expense	21,471	21,902	21,531
Amortization expense for certain other assets	1,135	995	1,055
Gain on sale of private investment		$ 3,072

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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Comprehensive Income [Abstract]
Unrealized holding gains during the period, income taxes	$ (811)	$ (486)	$ (1,065)
Reclassification adjustment for gains (losses) realized in net income, income taxes	$ 77	$ 56	$ (222)

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Shareholders' Equity (Stock Options Outstanding And Exercisable) (Details) (USD $)				12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 First Range Of Exercise Prices [Member] years	Dec. 31, 2011 Second Range Of Exercise Prices [Member] years	Dec. 31, 2011 Third Range Of Exercise Prices [Member] years	Dec. 31, 2011 Fourth Range Of Exercise Prices [Member] years	Dec. 31, 2011 Fifth Range Of Exercise Prices [Member] years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares	27,043,000			5,285,000	5,179,000	6,560,000	5,375,000	4,644,000
Weighted Average Exercise Price (Per Share)				$ 14.65	$ 15.30	$ 18.33	$ 22.75	$ 30.88
Weighted Average Remaining Contractual Life (Years)	5.9			5.28	6.00	6.33	6.13	5.46
Number of Shares	11,680,000	14,247,000	11,801,000	3,296,000	2,642,000	3,165,000	2,562,000	15,000
Weighted Average Exercise Price (Per Share)				$ 14.66	$ 14.84	$ 18.32	$ 21.55	$ 27.03
Weighted Average Remaining Contractual Life (Years)				4.24	2.17	6.37	3.00	5.00
Lower range				$ 14.05	$ 14.78	$ 17.65	$ 19.53	$ 27.03
Upper range				$ 14.71	$ 17.35	$ 19.28	$ 23.86	$ 32.49

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Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Business Segment Information [Abstract]

Financial Information About Business Segments

2011

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
Revenues	$	348,122		$	189,780		$	210,027		$	177,975		$	3,823		$	929,727
Expenses		339,339			110,438			106,585			115,963			11,559			683,884
Operating profit (loss)	$	8,783		$	79,342		$	103,442		$	62,012		$	(7,736	)	$	245,843
Profit margin		3	%		42	%		49	%		35	%		N/A			26	%

2010

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
Revenues	$	346,668		$	183,378		$	206,531		$	160,159		$	4,099		$	900,835
Expenses		310,633			110,388			106,934			103,421			12,676			644,052
Operating profit (loss)	$	36,035		$	72,990		$	99,597		$	56,738		$	(8,577	)	$	256,783
Profit margin		10	%		40	%		48	%		35	%		N/A			29	%

2009

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			LSV			Total
Revenues	$	361,273		$	166,097		$	177,721		$	139,004		$	4,492		$	211,961		$	1,060,548
Expenses (1)		309,300			109,418			99,924			93,074			11,625			136,580			759,921
Operating profit (loss)	$	51,973		$	56,679		$	77,797		$	45,930		$	(7,133	)	$	75,381		$	300,627
Profit margin		14	%		34	%		44	%		33	%		N/A			36	%		28	%

(1) For the year ended December 31, 2009, LSV includes $105,471 of noncontrolling interest of the other partners of LSV.

Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations

Year Ended December 31,	2011			2010			2009
Total operating profit from segments above	$	245,843		$	256,783		$	300,627
Corporate overhead expenses		(43,398	)		(40,715	)		(36,529	)
Noncontrolling interest reflected in segments		1,620			1,465			106,905
LSV Employee Group expenses (2)		0			0			(7,296	)
Income from operations	$	204,065		$	217,533		$	363,707

(2) Includes $7,222 in 2009 of amortization expense related to intangible assets.

Additional Information Pertaining To Business Segments

	Capital Expenditures						Depreciation
Year Ended December 31,	2011		2010		2009		2011		2010		2009
Private Banks	$	35,045	$	32,982	$	39,364	$	15,648	$	15,704	$	15,415
Investment Advisors		11,933		11,691		13,607		2,251		2,384		2,286
Institutional Investors		2,059		2,601		2,665		1,079		1,170		1,108
Investment Managers		3,081		3,659		4,306		1,809		1,891		1,580
Investments in New Businesses		577		608		831		114		148		176
LSV		0		0		1,358		0		0		395
Total from business segments	$	52,695	$	51,541	$	62,131	$	20,901	$	21,297	$	20,960
Corporate Overhead		530		799		1,085		570		605		571
	$	53,225	$	52,340	$	63,216	$	21,471	$	21,902	$	21,531

	Amortization
Year Ended December 31,	2011		2010		2009
Private Banks	$	18,081	$	15,100	$	24,058
Investment Advisors		6,201		5,467		8,550
Institutional Investors		864		1,213		927
Investment Managers		580		820		688
Investments in New Businesses		433		477		1,897
LSV		0		0		436
Total from business segments	$	26,159	$	23,077	$	36,556
LSV Employee Group		0		0		7,280
Corporate Overhead		1,129		971		772
	$	27,288	$	24,048	$	44,608

	Total Assets
	2011		2010
Private Banks	$	457,333	$	460,261
Investment Advisors		119,053		113,111
Institutional Investors		80,133		72,867
Investment Managers		95,760		96,378
Investments in New Businesses		5,962		6,801
Total from business segments	$	758,241	$	749,418
Corporate Overhead (3)		536,318		627,805
	$	1,294,559	$	1,377,223

(3) Unallocated assets primarily consist of cash and cash equivalents, marketable securities, and certain other shared services assets.

Revenues And Assets Based On The Location Of The Use Of The Products Or Services

For the Year Ended December 31,	2011		2010		2009
United States	$	785,506	$	767,068	$	950,891
International operations		144,221		133,767		109,657
	$	929,727	$	900,835	$	1,060,548

The following table presents assets based on their location:

	2011		2010
United States	$	1,098,643	$	1,193,775
International operations		195,916		183,448
	$	1,294,559	$	1,377,223

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Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Undistributed earnings of foreign subsidiaries	$ 61,194
Capital loss carryforwards		4,256
Unrecognized tax benefit, excluding interest and penalties	9,410
Unrecognized tax benefits that would affect effective tax rate	8,320
Amount included in Current liabilities	1,768
Amount included in Other long-term liabilities	8,276	5,645
Amount of previously unrecognized tax benefits recognized	697
Tax related interest and penalties	634	690	864
Unrecognized tax benefits within the next 12 months	$ 1,768

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Related Party Transactions

12 Months Ended

Dec. 31, 2011

Related Party Transactions [Abstract]

Related Party Transactions

Note 14 – Related Party Transactions:

The Company, either by itself or through its wholly-owned subsidiaries, is a party to Investment Advisory and Administration Agreements with regulated investment companies (RICs) and other investment products which are administered by the Company. These investment products are offered to clients of the Company and its subsidiaries. Under the Investment Advisory and Administration Agreements, the Company receives a fee for providing investment advisory, administrative, and accounting services. The investment advisory and administration fee is a fixed percentage, referred to as basis points, of the average daily net assets, subject to certain limitations. Investment advisory and administration fees received by the Company totaled $364,602, $354,341 and $334,084 in 2011, 2010 and 2009, respectively. The Company is also a party to various agreements with several RICs which are advised and/or administered by the Company. The Company receives a fee for providing shareholder, administrative and distribution services pursuant to the provisions of various shareholder service, administrative service, and distribution plans adopted by the RICs. These fees totaled $39,017, $36,007 and $33,008 in 2011, 2010 and 2009, respectively. A portion of the transaction costs incurred by the RICs for securities transactions are directed to the Company's broker-dealer subsidiary in its capacity as an introducing broker-dealer. The Company recognized $2,772, $4,875 and $4,300 in commissions during 2011, 2010 and 2009, respectively.

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Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Data [Abstract]

SIV-Related Gains (Losses)

	For the Three Months Ended
2011	March 31			June 30			Sept. 30			Dec. 31
Revenues	$	232,493		$	237,760		$	233,227		$	226,247
Income before income taxes	$	92,164		$	82,820		$	74,900		$	68,603
Net income attributable to SEI	$	57,728		$	53,603		$	49,232		$	44,396
Basic earnings per share	$	.31		$	.29		$	.27		$	.25
Diluted earnings per share	$	.31		$	.29		$	.27		$	.25
Effective income tax rate		37.1	%		34.7	%		33.8	%		34.7	%
Total SIV-related gains (losses)	$	6,864		$	(1,944	)	$	(792	)	$	(738	)
Diluted earnings per share (1)	$	.02		$	.01		$	.00		$	.00

(1) Attributable to SIV-related gains (losses).

	For the Three Months Ended
2010	March 31			June 30			Sept. 30			Dec. 31
Revenues	$	221,535		$	228,388		$	219,513		$	231,399
Income before income taxes	$	96,127		$	86,442		$	91,032		$	96,180
Net income attributable to SEI	$	59,420		$	53,478		$	56,389		$	62,400
Basic earnings per share	$	.31		$	.28		$	.30		$	.33
Diluted earnings per share	$	.31		$	.28		$	.30		$	.33
Effective income tax rate		37.9	%		37.8	%		37.8	%		37.0	%
Total SIV-related gains (losses)	$	17,349		$	3,913		$	8,728		$	14,257
Diluted earnings per share (2)	$	.06		$	.01		$	.03		$	.05

(2) Attributable to SIV-related gains.

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Schedule II - Valuation And Qualifying Accounts And Reserves

12 Months Ended

Dec. 31, 2011

Valuation And Qualifying Accounts And Reserves [Abstract]

Schedule II - Valuation And Qualifying Accounts And Reserves

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

FOR THE THREE YEARS ENDED DECEMBER 31, 2011, 2010, AND 2009

			Additions
Description	Balance at Beginning of Year		Charged to Costs and Expenses			Charged to Other Accounts		(Deductions)			Balance at End of Year
Allowance for doubtful accounts:
2011	$	1,195	$	0		$	0	$	(271	)	$	924
2010		3,348		0			0		(2,153	)		1,195
2009		2,656		692			0		0			3,348
Deferred income tax valuation allowance:
2011	$	9,008	$	(423	)	$	0	$	0		$	8,585
2010		6,217		1,443			1,348		0			9,008
2009		13,897		(32	)		0		(7,648	)		6,217

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Income Taxes (Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Income Taxes [Abstract]
Statutory rate									35.00%		35.00%		35.00%
State taxes, net of Federal tax benefit									2.00%		2.00%		1.50%
Foreign tax expense and tax rate differential									0.60%		0.40%		1.10%
Research and development tax credit									(0.70%)		(0.50%)		(0.80%)
Domestic Production Activities Deduction									(0.70%)		0.00%		0.00%
Domestic Production Activities Deduction, prior years, net									(1.50%)		0.00%		0.00%
Net change in uncertain tax positions									0.40%	[1]	0.20%	[1]	(2.70%)	[1]
Other, net									0.10%		(0.10%)		(0.20%)
Effective Income Tax Rate, Continuing Operations, Total	34.70%	33.80%	34.70%	37.10%	37.00%	37.80%	37.80%	37.90%	35.20%		37.00%		33.90%
Uncertain tax positions, percentage of federal tax									0.25%		0.14%		0.50%
Uncertain tax positions, percentage of state tax									0.14%		0.06%		0.20%
Uncertain tax positions, percentage of foreign tax									0.01%
Uncertain tax positions, percentage of research and development tax credit settled with the internal revenue service													2.00%

[1] For 2011, 0.25 percent relates to federal issues, 0.14 percent relates to state tax issues and the remaining 0.01 relates to foreign tax issues. For 2010, 0.14 percent relates to federal issues and the remaining 0.06 percent relates to state tax issues. For 2009, 2.0 percent relates to research and development tax credit settled with the Internal Revenue Service (IRS), 0.5 percent relates to federal issues settled with the IRS and the remaining 0.2 percent relates to state tax issues.

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Consolidated Statements Of Changes In Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	SEI Investments Company [Member]	Noncontrolling Interest [Member]	Total
Beginning balance at Dec. 31, 2008	$ 1,912	$ 485,721	$ 289,682	$ (8,163)
Beginning balance, shares at Dec. 31, 2008	191,195,000
Net income attributable to SEI Investments Company			174,335				174,335
Purchase and retirement of common stock	(32)	(6,970)	(47,112)				54,114
Purchase and retirement of common stock, shares	(3,198,000)						3,198,000
Issuance of common stock under the employee stock purchase plan	2	2,035
Issuance of common stock under the employee stock purchase plan, shares	156,000
Issuance of common stock upon exercise of stock options	20	21,607
Issuance of common stock upon exercise of stock options, shares	2,055,000
Stock-based compensation		13,962					14,503
Tax benefit on stock options exercised		5,725
Dividends declared			(32,422)
Other comprehensive (loss) income				9,421	11,218		11,218
Total SEI Investments Shareholders' Equity					909,723
Noncontrolling interest						121,895	121,895
Total Equity at Dec. 31, 2009	1,902	522,080	384,483	1,258			1,031,618
Ending balance, shares at Dec. 31, 2009	190,208,000
Net income attributable to SEI Investments Company			231,687				231,687
Purchase and retirement of common stock	(58)	(13,426)	(107,498)				120,982
Purchase and retirement of common stock, shares	(5,814,000)						5,814,000
Issuance of common stock under the employee stock purchase plan	1	1,902
Issuance of common stock under the employee stock purchase plan, shares	114,000
Issuance of common stock upon exercise of stock options	16	26,177
Issuance of common stock upon exercise of stock options, shares	1,633,000
Stock-based compensation		26,783					26,783
Tax benefit on stock options exercised		1,877
Dividends declared			(37,513)
Other comprehensive (loss) income				1,899	2,584		2,584
Total SEI Investments Shareholders' Equity					1,041,570		1,041,570
Noncontrolling interest						15,155	15,155
Total Equity at Dec. 31, 2010	1,861	565,393	471,159	3,157			1,056,725
Ending balance, shares at Dec. 31, 2010	186,141,000						186,141,000
Net income attributable to SEI Investments Company			204,959				204,959
Purchase and retirement of common stock	(111)	(27,196)	(183,858)				211,165
Purchase and retirement of common stock, shares	(11,109,000)						11,109,000
Issuance of common stock under the employee stock purchase plan	1	1,892
Issuance of common stock under the employee stock purchase plan, shares	110,000
Issuance of common stock upon exercise of stock options	14	22,314
Issuance of common stock upon exercise of stock options, shares	1,364,000
Stock-based compensation		14,112					14,112
Tax benefit on stock options exercised		1,434
Dividends declared			(48,558)
Other comprehensive (loss) income				(1,257)	(1,960)		(1,960)
Total SEI Investments Shareholders' Equity					1,025,316		1,025,316
Noncontrolling interest						16,143	16,143
Total Equity at Dec. 31, 2011	$ 1,765	$ 577,949	$ 443,702	$ 1,900			$ 1,041,459
Ending balance, shares at Dec. 31, 2011	176,506,000						176,506,000

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Receivables, allowance for doubtful accounts	$ 924	$ 1,195
Property and Equipment, accumulated depreciation and amortization	182,453	166,816
Capitalized Software, accumulated amortization	$ 117,100	$ 90,947
Series Preferred stock, par value	$ 0.05	$ 0.05
Series Preferred stock, shares authorized	50,000	50,000
Series Preferred stock, shares issued	0	0
Preferred stock, share outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	176,506,000	186,141,000
Common stock, shares outstanding	176,506,000	186,141,000

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Accumulated Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2011

Accumulated Comprehensive Income (Loss) [Abstract]

Accumulated Comprehensive Income (Loss)

Note 9 – Accumulated Comprehensive Income (Loss)

Comprehensive income consists of net income and other gains and losses affecting shareholders' equity that are excluded from net income. For the Company, comprehensive income includes unrealized gains and losses on available for sale securities and foreign currency translation adjustments. The Company presents comprehensive income in its Consolidated Statements of Comprehensive Income. Components of Accumulated other comprehensive income (loss) consisted of:

	Foreign Currency Translation Adjustments			Unrealized Holding Gains (Losses) On Investments			Accumulated Other Comprehensive Income (Loss)
Total accumulated comprehensive loss at January 1, 2009	$	(9,787	)	$	(1,524	)	$	(11,311	)
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at January 1, 2009		3,148			0			3,148
Total accumulated comprehensive loss attributable to SEI Investments Company at January 1, 2009	$	(6,639	)	$	(1,524	)	$	(8,163	)
Total comprehensive income		8,734			2,484			11,218
Less: Total comprehensive income attributable to noncontrolling interest		(1,797	)		0			(1,797	)
Total comprehensive income attributable to SEI Investments Company	$	6,937		$	2,484		$	9,421
Total accumulated comprehensive income (loss) at December 31, 2009		(1,053	)		960			(93	)
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2009		1,351			0			1,351
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2009	$	298		$	960		$	1,258
Total comprehensive income		2,205			379			2,584
Less: Total comprehensive income attributable to noncontrolling interest		(685	)		0			(685	)
Total comprehensive income attributable to SEI Investments Company	$	1,520		$	379		$	1,899
Total accumulated comprehensive income at December 31, 2010		1,152			1,339			2,491
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2010		666			0			666
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2010	$	1,818		$	1,339		$	3,157
Total comprehensive loss		(3,195	)		1,235			(1,960	)
Less: Total comprehensive loss attributable to noncontrolling interest		703			0			703
Total comprehensive loss attributable to SEI Investments Company	$	(2,492	)	$	1,235		$	(1,257	)
Total accumulated comprehensive income at December 31, 2011		(2,043	)		2,574			531
Less: Total accumulated comprehensive loss attributable to noncontrolling interest at December 31, 2011		1,369			0			1,369
Total accumulated comprehensive income attributable to SEI Investments Company at December 31, 2011	$	(674	)	$	2,574		$	1,900

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Document And Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 31, 2012	Jun. 30, 2011
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Trading Symbol	SEIC
Entity Registrant Name	SEI INVESTMENTS CO
Entity Central Index Key	0000350894
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		176,591,930
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3.2

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Employee Benefit Plan

12 Months Ended

Dec. 31, 2011

Employee Benefit Plan [Abstract]

Employee Benefit Plan

Note 10 – Employee Benefit Plan:

The Company has a tax-qualified defined contribution plan (the Plan). The Plan provides retirement benefits, including provisions for early retirement and disability benefits, as well as a tax-deferred savings feature. After satisfying certain requirements, participants are vested in employer contributions at the time the contributions are made. All Company contributions are discretionary and are made from available profits. The Company contributed $4,783, $4,496, and $4,327 to the Plan in 2011, 2010, and 2009, respectively.

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Schedule II - Valuation And Qualifying Accounts And Reserves (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 1,195	$ 3,348	$ 2,656
Additions, Charged to Costs and Expenses	0	0	692
Additions, Charged to Other Accounts	0	0	0
(Deductions)	(271)	(2,153)	0
Balance at End of Year	924	1,195	3,348
Deferred Income Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	9,008	6,217	13,897
Additions, Charged to Costs and Expenses	(423)	1,443	(32)
Additions, Charged to Other Accounts	0	1,348	0
(Deductions)	0	0	(7,648)
Balance at End of Year	$ 8,585	$ 9,008	$ 6,217

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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues:
Asset management, administration and distribution fees	$ 669,788	$ 628,535	$ 773,186
Information processing and software servicing fees	222,417	231,529	231,807
Transaction-based and trade execution fees	37,522	40,771	55,555
Total revenues	929,727	900,835	1,060,548
Expenses:
Subadvisory, distribution and other asset management costs	103,134	101,722	94,449
Software royalties and other information processing costs	27,437	24,419	21,509
Brokerage commissions	27,022	28,882	41,146
Compensation, benefits and other personnel	289,445	269,165	274,675
Stock-based compensation	14,112	26,783	14,503
Consulting, outsourcing and professional fees	113,171	89,033	81,694
Data processing and computer related	47,003	41,064	45,403
Facilities, supplies and other costs	55,579	56,284	57,323
Amortization	27,288	24,048	44,608
Depreciation	21,471	21,902	21,531
Total expenses	725,662	683,302	696,841
Income from operations	204,065	217,533	363,707
Net gain (loss) from investments	3,360	48,533	(4,926)
Interest and dividend income	5,829	6,326	7,281
Interest expense	(585)	(1,478)	(3,744)
Other expense, net	0	(590)	0
Equity in earnings of unconsolidated affiliate	105,818	99,457	0
Net income before income taxes	318,487	369,781	362,318
Income taxes	111,837	136,461	89,886
Net income	206,650	233,320	272,432
Less: Net income attributable to the noncontrolling interest	(1,691)	(1,633)	(98,097)
Net income attributable to SEI Investments Company	$ 204,959	$ 231,687	$ 174,335
Basic earnings per common share	$ 1.12	$ 1.23	$ 0.91
Diluted earnings per common share	$ 1.11	$ 1.22	$ 0.91

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Composition Of Certain Financial Statement Captions

12 Months Ended

Dec. 31, 2011

Composition Of Certain Financial Statement Captions [Abstract]

Composition Of Certain Financial Statement Captions

Note 4 – Composition of Certain Financial Statement Captions

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:

	2011			2010
Trade receivables	$	37,822		$	34,528
Fees earned, not billed		92,916			93,506
Other receivables		12,295			9,651
		143,033			137,685
Less: Allowance for doubtful accounts		(924	)		(1,195	)
Receivables, net	$	142,109		$	136,490

Fees earned, not billed represents receivables earned but unbilled and results from timing differences between services provided and contractual billing schedules. These billing schedules generally provide for fees to be billed on a quarterly basis.

Receivables from regulated investment companies on the accompanying Consolidated Balance Sheets primarily represent fees receivable for distribution, investment advisory, and administration services to various regulated investment companies sponsored by SEI (See Note 14).

Property and Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:

	2011			2010
Buildings	$	136,949		$	135,935
Equipment		64,256			63,902
Land		9,929			9,890
Purchased software		77,971			74,720
Furniture and fixtures		17,999			18,566
Leasehold improvements		4,558			4,250
Construction in progress		339			121
		312,001			307,384
Less: Accumulated depreciation		(182,453	)		(166,816	)
Property and Equipment, net	$	129,548		$	140,568

Depreciation expense related to property and equipment for 2011, 2010, and 2009 was $21,471, $21,902, and $21,531, respectively.

Other Assets

Other assets consist of long-term prepaid expenses, deposits, other investments at cost and various other assets. Amortization expense for certain other assets for 2011, 2010, and 2009 was $1,135, $995 and $1,055, respectively.

The Company recognized gains of $3,072 in 2010 due to the sale of its entire ownership interest in a small, private company that was involved in a merger. The Company's investment in the firm had been accounted for under the cost basis. The gain is reflected in Net gain (loss) on investments on the accompanying Consolidated Statements of Operations.

Accrued Liabilities

Accrued Liabilities on the accompanying Consolidated Balance Sheets consist of:

	2011		2010
Accrued employee compensation	$	48,112	$	43,747
Accrued employee benefits and other personnel		5,408		6,988
Accrued consulting, outsourcing and professional fees		17,477		16,390
Accrued brokerage fees		8,665		11,942
Accrued sub-advisory, distribution and other asset management fees		17,091		16,778
Accrued income taxes		0		2,077
Accrued dividend payable		26,518		0
Other accrued liabilities		23,773		23,488
Accrued liabilities	$	147,044	$	121,410

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Variable Interest Entities - Investment Products

12 Months Ended

Dec. 31, 2011

Variable Interest Entities - Investment Products [Abstract]

Variable Interest Entities - Investment Products

Note 3 – Variable Interest Entities – Investment Products

The Company has created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities.

An entity that lacks decision-making rights is a VIE. In some circumstances, the Manager or Trustee of the Company's investment products controls the governing decisions about the investment activities with respect to the ongoing operations of the investment products without the equity investors possessing the right to remove the Manager or Trustee. Therefore, the equity investors, as a group, do not have the ability to make decisions that have an impact on the ongoing activities of such investment products. Consequently, some of the Company's investment products have been determined to be VIEs at inception.

The VIEs are marketed with investment objectives to generate positive returns; however, the nature of such investments exposes the investors to the risk that the value of the VIEs may increase or decrease. The purpose and design of the VIEs are to achieve the investment objective by implementing strategies which are designed to minimize potential losses; however, there is no assurance given that these strategies will be successful.

The Company does not have a significant equity investment in any of the VIEs and does not have an obligation to enter into any guarantee agreements with the VIEs. The fees paid to the decision maker of a VIE are considered to be variable interests if the decision maker is not subject to substantive kick-out rights. The fees paid to the Company represent a variable interest when the decision maker is not subject to substantive kick-out rights.

The Company is not the primary beneficiary of the VIEs because the expected fees and the expected return on any investment into the VIE by the Company relative to the expected returns of the VIE to the equity investor holders does not approach 50 percent of the expected losses or gains of the VIEs. Therefore, the Company is not required to consolidate any investment products that are VIEs into its financial statements. The Company's variable interest in the VIEs, which consists of management fees and in some situations, seed capital, would not be considered a significant variable interest.

The risks to the Company associated with its involvement with any of the investment products that are VIEs are limited to the cash flows received from the revenue generated for asset management, administration and distribution services and any equity investments in the VIEs. Both of these items are immaterial. The Company has no other financial obligation to the VIEs.

Amounts relating to fees received from the VIEs included in Receivables and amounts relating to equity investments in the VIEs included in Investments Available for Sale on the Company's Consolidated Balance Sheets are immaterial to the total current assets of the Company.

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Quarterly Financial Data

12 Months Ended

Dec. 31, 2011

Quarterly Financial Data [Abstract]

Quarterly Financial Data

Note 15 – Quarterly Financial Data (Unaudited):

	For the Three Months Ended
2011	March 31			June 30			Sept. 30			Dec. 31
Revenues	$	232,493		$	237,760		$	233,227		$	226,247
Income before income taxes	$	92,164		$	82,820		$	74,900		$	68,603
Net income attributable to SEI	$	57,728		$	53,603		$	49,232		$	44,396
Basic earnings per share	$	.31		$	.29		$	.27		$	.25
Diluted earnings per share	$	.31		$	.29		$	.27		$	.25
Effective income tax rate		37.1	%		34.7	%		33.8	%		34.7	%
Total SIV-related gains (losses)	$	6,864		$	(1,944	)	$	(792	)	$	(738	)
Diluted earnings per share (1)	$	.02		$	.01		$	.00		$	.00

(1) Attributable to SIV-related gains (losses).

	For the Three Months Ended
2010	March 31			June 30			Sept. 30			Dec. 31
Revenues	$	221,535		$	228,388		$	219,513		$	231,399
Income before income taxes	$	96,127		$	86,442		$	91,032		$	96,180
Net income attributable to SEI	$	59,420		$	53,478		$	56,389		$	62,400
Basic earnings per share	$	.31		$	.28		$	.30		$	.33
Diluted earnings per share	$	.31		$	.28		$	.30		$	.33
Effective income tax rate		37.9	%		37.8	%		37.8	%		37.0	%
Total SIV-related gains (losses)	$	17,349		$	3,913		$	8,728		$	14,257
Diluted earnings per share (2)	$	.06		$	.01		$	.03		$	.05

(2) Attributable to SIV-related gains.

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Commitments And Contingencies

12 Months Ended

Dec. 31, 2011

Commitments And Contingencies [Abstract]

Commitments And Contingencies

Note 11 – Commitments and Contingencies:

The Company leases certain of its facilities, data processing equipment, and software under non-cancelable operating leases, some which contain escalation clauses for increased taxes and operating expenses. The Company has entered into maintenance agreements primarily for its data processing equipment. Rent expense was $19,760, $17,210, and $19,022 in 2011, 2010, and 2009, respectively.

The aggregate noncancellable minimum commitments at December 31, 2011 are:

2012	$	17,892
2013		13,527
2014		6,997
2015		1,955
2016 and thereafter		10,419
	$	50,790

In the ordinary course of business, the Company from time to time enters into contracts containing indemnification obligations of the Company. These obligations may require the Company to make payments to another party upon the occurrence of certain events including the failure by the Company to meet its performance obligations under the contract. These contractual indemnification provisions are often standard contractual terms of the nature customarily found in the type of contracts entered into by the Company. In many cases, there are no stated or notional amounts included in the indemnification provisions. There are no amounts reflected on the Consolidated Balance Sheets as of December 31, 2011 and 2010 related to these indemnifications.

In the normal course of business, the Company is party to various claims and legal proceedings.

One of SEI's principal subsidiaries, SIDCO, has been named as a defendant in certain putative class action complaints (the Complaints) related to leveraged exchange traded funds (ETFs) advised by ProShares Advisors, LLC. The first complaint was filed on August 5, 2009. To date, the Complaints have been filed in the United States District Court for the Southern District of New York and in the United States District Court for the District of Maryland. The three complaints filed in the District of Maryland have been voluntarily dismissed by the plaintiffs. Two of them were subsequently re-filed in the Southern District of New York. Two of the complaints filed in the Southern District of New York have also been voluntarily dismissed by plaintiffs. The Complaints are purportedly made on behalf of all persons that purchased or otherwise acquired shares in various ProShares leveraged ETFs pursuant or traceable to allegedly false and misleading registration statements, prospectuses and statements of additional information. The Complaints name as defendants ProShares Advisors, LLC; ProShares Trust; ProShares Trust II, SIDCO, and various officers and trustees to ProShares Advisors, LLC; ProShares Trust and ProShares Trust II. The Complaints allege that SIDCO was the distributor and principal underwriter for the various ProShares leveraged ETFs that were distributed to authorized participants and ultimately shareholders. The complaints allege that the registration statements for the ProShares ETFs were materially false and misleading because they failed adequately to describe the nature and risks of the investments. The Complaints allege that SIDCO is liable for these purportedly material misstatements and omissions under Section 11 of the Securities Act of 1933. The Complaints seek unspecified compensatory and other damages, reasonable costs and other relief. Defendants have moved to consolidate the complaints, which motion has been granted. The Court appointed lead plaintiff on July 13, 2010, and an amended consolidated class action complaint was filed on September 25, 2010 asserting substantially the same claims. Defendants moved to dismiss on November 15, 2010. On December 16, 2010, lead plaintiff informed the Court and Defendants that lead plaintiff elected to file a second amended consolidated complaint, which was filed on January 31, 2011. Defendants filed a motion to dismiss the second complaint on March 17, 2011. Oral argument on this motion was held on February 2, 2012. While the outcome of this litigation is uncertain given its early phase, SEI believes that it has valid defenses to plaintiffs' claims and intends to defend the lawsuits vigorously.

SEI has been named in six lawsuits filed in Louisiana. Five lawsuits were filed in the 19th Judicial District Court for the Parish of East Baton Rouge, State of Louisiana. One of the five actions purports to set forth claims on behalf of a class and also names SPTC as a defendant. Two of the other actions also name SPTC as a defendant. All five actions name various defendants in addition to SEI, and, in all five actions, the plaintiffs purport to bring a cause of action under the Louisiana Securities Act. The putative class action originally included a claim against SEI and SPTC for an alleged violation of the Louisiana Unfair Trade Practices Act. Two of the other five actions include claims for violations of the Louisiana Racketeering Act and possibly conspiracy. In addition, another group of plaintiffs have filed a lawsuit in the 23rd Judicial District Court for the Parish of Ascension, State of Louisiana, against SEI and SPTC and other defendants asserting claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Securities Act and Louisiana Racketeering Act and conspiracy. The underlying allegations in all the actions are purportedly related to the role of SPTC in providing back-office services to Stanford Trust Company. The petitions allege that SEI and SPTC aided and abetted or otherwise participated in the sale of "certificates of deposit" issued by Stanford International Bank. Two of the five actions filed in East Baton Rouge have been removed to federal court, and plaintiffs' motions to remand are pending. These two cases have been transferred by the Judicial Panel on Multidistrict Litigation to United States District Court for the Northern District of Texas. On August 31, 2011, the United States District Court for the Northern District of Texas issued an order and judgment that the causes of action alleged against SEI and SPTC in the two remanded actions were preempted by federal law and the Court dismissed these cases with prejudice. The Court of Appeals for the Fifth Circuit has granted an expedited appeal of the United States District Court's order and judgment. The appeal has been fully briefed, and oral argument was held on February 7, 2012. The case filed in Ascension was also removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas. The schedule for responding to that complaint has not yet been established. The plaintiffs in the remaining two cases in East Baton Rouge have granted SEI an extension to respond to the filings. SEI and SPTC filed exceptions in the putative class action pending in East Baton Rouge, which the Court granted in part and dismissed the claims under the Louisiana Unfair Trade Practices Act and denied in part as to the other exceptions. SEI and SPTC filed an answer to the East Baton Rouge putative class action; plaintiffs filed a motion for class certification; and SEI and SPTC also filed a motion for summary judgment against certain named plaintiffs which the Court stated will not be set for hearing until after the hearing on the class certification motion. Following the decision by the United States District Court for the Northern District of Texas, the Court in the East Baton Rouge action issued an order staying the proceedings in the East Baton Rouge class action pending the outcome of the appeal of the order and judgment of the United States District Court for the Northern District of Texas. While the outcome of this litigation is uncertain given its early phase, SEI and SPTC believe that they have valid defenses to plaintiffs' claims and intend to defend the lawsuits vigorously.

Because of the uncertainty of the make-up of the classes, the specific theories of liability that may survive a motion to dismiss, the lack of discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the foregoing lawsuits.

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Lines Of Credit

12 Months Ended

Dec. 31, 2011

Lines Of Credit [Abstract]

Lines Of Credit

Note 7 – Lines of Credit:

The Company maintained a $300,000 revolving line of credit through a Credit Agreement (Credit Facility), as amended, with JPMorgan Chase Bank, N.A. and a syndicate of other lenders which was scheduled to expire in July 2012. Outstanding borrowings under the Credit Facility accrued interest at 0.450 percent above the London Interbank Offer Rate (LIBOR) during 2011. There was also a commitment fee equal to 0.09 percent per annum on the daily unused portion of the facility charged to the Company during 2011. The Credit Facility, as amended, contained covenants that restricted the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. None of the covenants of the Credit Facility negatively affected the Company's liquidity or capital resources. As of December 31, 2011, the Company's ability to borrow from the Credit Facility was not limited by any covenant of the agreement.

In 2009, the Company borrowed $254,000 from the Credit Facility to finance the purchase of SIV securities from SEI-sponsored money market mutual funds (See Note 6). The Company made principal payments of $95,000, $138,000 and $21,000 during 2011, 2010 and 2009, respectively, to fully repay the outstanding balance of the Credit Facility. The Company was in compliance with all covenants of the Credit Facility during 2011.

The average rates applied to the Credit Facility during 2011, 2010 and 2009 were 0.68 percent, 0.77 percent and 1.05 percent, respectively. The Company incurred $585, $1,478, and $2,491 in interest charges and commitment fees relating to the Credit Facility during 2011, 2010, and 2009, respectively, which are reflected in Interest expense on the accompanying Consolidated Statements of Operations.

The Company considers the book value of long-term debt on the accompanying Consolidated Balance Sheet at December 31, 2010 related to the borrowings through the Credit Facility to be representative of its fair value. The Company had no borrowings through the Credit Facility at December 31, 2011.

On February 2, 2012 (the Closing Date), the Company terminated the Credit Facility agreement and entered into a new five-year $300,000 Credit Agreement (the 2012 Credit Facility) with Wells Fargo Bank, National Association, and a syndicate of other lenders. The 2012 Credit Facility became available on the Closing Date and is scheduled to expire in February 2017, at which time any aggregate principal amount of loans outstanding becomes payable in full. Any borrowings made under the 2012 Credit Facility will accrue interest at 1.250 percent above LIBOR. There is also a commitment fee equal to 0.15 percent per annum on the daily unused portion of the facility. The aggregate amount of the 2012 Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The 2012 Credit Facility contains covenants that restrict the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. In the event of a default under the 2012 Credit Facility, the Company would also be restricted from paying dividends on, or repurchasing, its common stock without the approval of the lenders. None of the covenants of the 2012 Credit Facility negatively affect the Company's liquidity or capital resources. Both the interest rate and commitment fee prices may increase if the Company's leverage ratio reaches certain levels. Upon the occurrence of certain financial or economic events, significant corporate events, or certain other events of default constituting an event of default under the 2012 Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the 2012 Credit Facility may be terminated.

The Company's Canadian subsidiary has a credit facility agreement (the Canadian Credit Facility) for the purpose of facilitating the settlement of mutual fund transactions. The Canadian Credit Facility has no stated expiration date. The amount of the facility is generally limited to $2,000 Canadian dollars or the equivalent amount in U.S. dollars. The Canadian Credit Facility does not contain any covenants which restrict the liquidity or capital resources of the Company. The Company had no borrowings under the Canadian Credit Facility and was in compliance with all covenants during 2011.

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Shareholders' Equity (Shares Repurchased And The Related Total Costs) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Shareholders' Equity [Abstract]
Total Number of Shares Repurchased	11,109,000	5,814,000	3,198,000
Total Cost	$ 211,165	$ 120,982	$ 54,114

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Fair Value Measurements

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements

Note 5 – Fair Value Measurements

The fair value of the Company's financial assets and liabilities is determined in accordance with the fair value hierarchy. The fair value of the Company's financial assets, except for the fair value of senior notes issued by SIVs, is determined using Level 1 or Level 2 inputs and consist mainly of investments in equity and fixed-income mutual funds that are quoted daily and GNMA and other U.S. government agency securities that are single issuer pools that are valued based on current market data for the specific issue owned or pools of similar securities. Level 3 financial assets primarily consist of senior note obligations issued by SIVs. The Company did not have any Level 3 financial liabilities at December 31, 2011 or 2010. There were no transfers of financial assets between levels within the fair value hierarchy during 2011 or 2010.

Valuation of SIV Securities

The underlying collateral of the SIV securities is mainly comprised of asset-backed securities and collateralized debt obligations. The Company received prices for all of its SIV securities from two independent third party firms. Given the lack of any reliable market data on the SIV securities, the firms utilized a valuation model that employs a net asset approach which considers the value of the underlying collateral of the SIV securities to determine the fair value of the SIV securities. Management evaluates the prices received from these firms and considers other information, such as the existence of any current market activity, to determine the fair value of the SIV securities. The underlying collateral is specifically identified by its CUSIP or ISIN number. In January 2011, the Company sold the senior obligation originally issued by Stanfield Victoria. The Company's sole remaining SIV security consists of the senior note issued by Gryphon.

The valuation model maintained by the third party firm to value the SIV securities owned as of December 31, 2010 (except the Stanfield Victoria note) obtained price quotes for each security that comprised the underlying collateral of the SIV securities. Price quotes were primarily obtained from two pricing vendors that are independent entities of the firm that maintained the valuation model. Other pricing vendors were used in limited situations when a security quote cannot be obtained from either of the two primary pricing vendors. The average of the two quotes received was used to value each security. A portion of the securities that comprised the underlying collateral of the SIV securities could not be priced by the pricing vendors. For these securities that lack price quotes, the last price quote received was adjusted by the weighted average percentage movement of securities held as collateral within the same sector classification or based upon the weighted average movement of all priced securities. For example, a residential mortgage-backed security that has not received a quote for an extended period of time was adjusted by the weighted average percentage movement of all quoted residential mortgage-backed securities held as collateral by the SIV security. Additionally, the securities were aggregated by type or sector (i.e. home equity line of credit, sub-prime 1^st liens, residential mortgage-backed securities, etc.) and the weighted average quote of all securities within a sector held by the SIV was compared with the range of quotes received for similar securities within the same sector from the trading desk of an affiliate of the third party firm that maintains the SIV valuation model. The weighted average quote of all securities within a sector held by the SIV must be within the range of quotes received from the trading desk within that same sector. If the weighted average quote for all securities within a sector held by the SIV was outside that range, the average quote received from the pricing vendors was adjusted. In any event, the value assigned to each security held by the SIV was the lower of (i) the average of the quotes received from the pricing vendors or (ii) the lowest quote received from the trading desk for a similar security.

The pricing vendors used by the firm that maintained the valuation model utilize widely-accepted pricing models, which are evaluated by the pricing vendor, that vary by asset class and incorporate available trade, bid, and other market information. The market inputs that these pricing vendors sought for their evaluation of securities included: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and other available market data. Broker quotes may be binding or non-binding. For certain security types, additional inputs may be used. The pricing vendors may prioritize inputs differently from time to time for any security based on current market conditions. For each asset class, the pricing vendor used a team of evaluators that gathered information from market sources and integrated relevant credit information, perceived market movements and sector news into the evaluated pricing models. For a structured security evaluation, including mortgage-backed securities, these evaluators considered various characteristics including issuer, vintage, purpose of loan, collateral attributes, prepayment speeds and credit ratings in order to properly identify trades and quotes for similar securities which are gathered for use in the evaluation process. Evaluators follow multiple review processes throughout each month that assess the available market, credit and deal level information in support of the evaluation process. If it is determined that sufficient objectively verifiable information does not exist to support a security's valuation, the pricing vendor discontinued providing a quote on that security. As previously stated, securities that lack a quote from a pricing vendor are valued using the most recent quoted price and adjusting that price by the weighted average percentage change in the respective sector of all other similar securities that are held by the SIV.

The model used by the second independent valuation firm to determine the fair value of the Stanfield Victoria note as of December 31, 2010 and the Gryphon Note as of December 31, 2011 also utilized a net asset approach that attempts to value the underlying collateral of the SIV securities through the use of industry accepted and proprietary valuation techniques and models. This approach combines advanced analytics with real-time market information that incorporate structural and fundamental analysis, collateral characteristics, recent market developments and current trading activity for each security. Each security that makes up the underlying collateral is analyzed by using observable collateral characteristics and credit statistics in order to project future performance and expected cash flows for each individual security. The projected cash flows incorporate assumptions and expectations based upon the foregoing analysis of the collateral characteristics such as, but not limited to, default probabilities, recovery rates, prepayment speeds and loss severities. Expected future cash flows are discounted at an appropriate yield derived from the individual security, structural and collateral characteristics, trading levels and other available market data. Different modeling techniques and associated inputs and assumptions may be used to project future cash flows for each security depending upon the asset classification of that individual security (i.e. residential mortgage-backed security, commercial mortgage-backed security, collateralized debt obligations, etc.). The aggregate value of the discounted cash flows of the underlying collateral is compared to the total remaining par value of the collateral to determine the expected recovery price, or fair value, of the remaining note obligations.

Management may also consider, when available, price quotes from brokers and dealers. If a price quote is available, management will compare this number to the fair value derived from the valuation models of the two independent firms giving consideration to other market factors and risk premiums. Given the lack of any significant trading activity for any of the SIV securities owned by the Company, management believes that market prices for any SIV securities may not represent the implied fair value of the SIV securities owned by the Company.

Management evaluates current market transactions, if any, for each of the SIV securities. In the event a market transaction does exist for a SIV security, management evaluates the publicly available information surrounding the transaction in order to assess if the price used represents the fair value for the SIV security. In management's opinion, the current market for SIV securities does not represent any orderly and efficient market.

The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:

			At December 31, 2011
			Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active  Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	8,010	$	8,010	$	0	$	0
Fixed-income available-for-sale securities		74,998		0		74,998		0
Fixed income securities owned		20,949		0		20,949		0
Trading securities		56,325		3,702		0		52,623
	$	160,282	$	11,712	$	95,947	$	52,623

			At December 31, 2010
			Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	5,853	$	5,853	$	0	$	0
Fixed-income available-for-sale securities		68,917		0		68,917		0
Trading securities		104,594		3,949		0		100,645
	$	179,364	$	9,802	$	68,917	$	100,645

The table below presents a reconciliation for all assets and liabilities of the Company measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the period from January 1, 2010 to December 31, 2011:

	Trading Securities
Balance, January 1, 2010	$	120,714
Purchases		536
Issuances		0
Principal prepayments and settlements		(45,857	)
Sales		(18,995	)
Total gains or (losses) (realized/unrealized):
Included in earnings		44,247
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance, December 31, 2010	$	100,645
Purchases		1,215
Issuances		0
Principal prepayments and settlements		(17,921	)
Sales		(34,706	)
Total gains or (losses) (realized/unrealized):
Included in earnings		3,390
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance, December 31, 2011	$	52,623

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Marketable Securities

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Marketable Securities

Note 6 – Marketable Securities

Investments Available For Sale

Investments available for sale classified as non-current assets consist of:

	For the Year ended December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	8,243	$	48	$	(360	)	$	7,931
Other mutual funds		69		10		0			79
Debt securities		70,604		4,394		0			74,998
	$	78,916	$	4,452	$	(360	)	$	83,008
	For the Year Ended December 31, 2010
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	5,086	$	279	$	(14	)	$	5,351
Other mutual funds		443		59		0			502
Debt securities		67,118		1,799		0			68,917
	$	72,647	$	2,137	$	(14	)	$	74,770

Net unrealized holding gains were $2,574 (net of income tax expense of $1,518) at December 31, 2011. At December 31, 2010, net unrealized holding gains were $1,339 (net of income tax expense of $784). These unrealized gains are reported as separate components of Accumulated other comprehensive income on the accompanying Consolidated Balance Sheets.

The Company recognized gross realized gains from available-for-sale securities of $255, $184 and $440 in 2011, 2010 and 2009, respectively. Gross realized losses in 2009 were $123. Gross realized losses in 2011 and 2010 were minimal.

The Company had investments in two SEI-sponsored mutual funds which primarily invest in fixed-income securities, including debt securities issued by municipalities and mortgage-backed securities. In 2009, management determined that the decline in market value for one of these mutual funds was other-than-temporary and, therefore, recorded an impairment charge for $901. The other-than-temporary impairment charge is included in Net gain (loss) on investments on the Consolidated Statements of Operations.

The Company's debt securities are issued by the Government National Mortgage Association and are backed by the full faith and credit of the U.S. government. These securities were purchased to satisfy applicable regulatory requirements of SPTC and have maturity dates which range from 2020 to 2041.

Trading Securities

Trading securities of the Company consist of:

	For the Year ended December 31, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	146,363	$	0	$	(94,955	)	$	51,408
LSV-sponsored mutual funds		2,049		1,653		0			3,702
Other investments		1,215		0		0			1,215
	$	149,627	$	1,653	$	(94,955	)	$	56,325
	For the Year ended December 31, 2010
	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SIV securities	$	231,026	$	0	$	(130,381	)	$	100,645
LSV-sponsored mutual funds		2,049		1,900		0			3,949
	$	233,075	$	1,900	$	(130,381	)	$	104,594

The Company records all of its trading securities on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these securities are recognized in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations.

During 2011 and 2010, the Company recognized net gains from SIV securities of $3,390 and $44,247, respectively. Of the net gains recognized during 2011, gains of $10,614 resulted from cash payments received from the SIV securities offset by losses of $7,224 which resulted from a decrease in fair value at December 31, 2011. During 2010, the Company recognized gains from SIV securities of $44,247, of which $27,510 resulted from cash payments received from the SIV securities and $16,460 was from a net increase in fair value at December 31, 2010. In addition, the Company recognized a net gain of $277 from sales of three SIV securities during 2010. The cumulative loss recognized by the Company pertaining to these SIV securities sold in 2010 was $17,944. The net gains (losses) from the SIV securities are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations.

In January 2011, the Company sold the senior note obligation originally issued by Stanfield Victoria. There was no gain or loss recognized by the Company from the sale of the note as the fair value of the Stanfield Victoria note at December 31, 2010 was not different than the sale price received. Currently, the Company's remaining SIV security consists of the senior note obligation issued by Gryphon.

The Company has an investment related to the startup of mutual funds sponsored by LSV. These are U.S. dollar denominated funds that invests primarily in securities of Canadian, Australian and Japanese companies as well as various other global securities. The underlying securities held by the funds are translated into U.S. dollars within the funds. During the three months ended June 30, 2010, the Company sold a portion of its investment in the LSV-sponsored funds. Additionally, the Company sold all of the equity and currency futures contracts originally purchased as part of an economic strategy to minimize exposure to price and currency risk related to the investment. The net gains recognized from the partial sale of the LSV-sponsored funds and the equity and futures contracts were minimal. As of December 31, 2011, the Company's remaining investment in the LSV-sponsored funds had a cost value of $2,049 and a fair value of $3,702.

Securities Owned

During 2011, the Company's broker-dealer subsidiary, SIDCO, made investments in U.S. government agency and commercial paper securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $20,949 at December 31, 2011. The change in fair value of the securities recognized in 2011 was minimal.

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Shareholders' Equity

12 Months Ended

Dec. 31, 2011

Shareholders' Equity [Abstract]

Shareholders' Equity

Note 8 – Shareholders' Equity:

Stock-Based Compensation

The Company currently has one active equity compensation plan, the 2007 Equity Compensation Plan (the 2007 Plan), which provides for the grant of incentive stock options, non-qualified stock options and stock appreciation rights with respect to up to 20 million shares of common stock of the Company, subject to adjustment for stock splits, reclassifications, mergers and other events. Permitted grantees under the 2007 Plan include employees, non-employee directors and consultants who perform services for the Company. The plan is administered by the Compensation Committee of the Board of Directors of the Company. The Company has only granted non-qualified stock options under the plan.

The Company discontinued any further grants under the Company's 1998 Equity Compensation Plan (the 1998 Plan) as a result of the approval of the 2007 Plan. No options are available for grant from this plan. Grants made from the 1998 Plan continue in effect under the terms of the grant.

All outstanding stock options have performance-based vesting provisions that tie the vesting of stock options to the Company's financial performance. The Company's stock options vest at a rate of 50 percent when a specified diluted earning per share target is achieved, and the remaining 50 percent when a second, higher specified diluted earnings per share target is achieved. Stock options granted prior to 2006 fully vest after seven years from the date of grant. Beginning in 2006, the seven year vesting trigger was eliminated and, as a result, options do not vest due to the passage of time but solely as a result of achievement of the financial vesting targets. Earnings per share targets are calculated exclusive of stock-based compensation expense, net of tax. The diluted earnings per share targets are established at time of grant and are measured annually on December 31. The amount of stock-based compensation expense is based upon management's estimate of when the earnings per share targets may be achieved. If management's estimate of the attainment of the earnings per share targets proves to be inaccurate, the remaining amount of stock-based compensation expense could be accelerated, spread out over a longer period, or reversed. This may cause volatility in the recognition of stock-based compensation expense in future periods and could materially affect the Company's net income and net income per share.

The Company uses the Black-Scholes option pricing model to determine the fair value of stock options. The determination of the fair value of stock options on the date of grant using an option-pricing model is affected by the price of the Company's common stock as well as other variables. These variables include expected stock price volatility over the term of the awards, actual and projected employee stock exercise behaviors, risk-free interest rate and expected dividends. The Company primarily uses historical data to estimate the variables used in the option-pricing model except expected volatility. The Company uses a combination of historical and implied volatility. The Company estimates forfeitures at the time of grant and may revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company uses historical data to estimate pre-vesting forfeitures and record stock-based compensation expense only for those awards that are expected to vest. Stock-based compensation is amortized over the requisite service periods of the awards, which are generally the vesting periods.

The weighted average fair value of the Company's stock options granted during 2011, 2010 and 2009 were $5.70, $9.65 and $7.24, respectively, using the following assumptions:

	2011			2010			2009
Expected term (in years)		7.65			7.45			7.49
Expected volatility		40.43	%		36.35	%		37.44	%
Expected dividend yield		1.90	%		0.84	%		1.02	%
Risk-free interest rate		1.66	%		3.01	%		3.31	%

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in 2011, 2010 and 2009 as follows:

	2011			2010			2009
Stock-based compensation expense	$	14,112		$	26,783		$	14,503
Less: Deferred tax benefit		(5,332	)		(10,068	)		(4,636	)
Stock-based compensation expense, net of tax	$	8,780		$	16,715		$	9,867

During 2010, the Company revised its estimates of when some vesting targets are expected to be achieved. These changes in management's estimates resulted in an increase of $11,663 in stock-based compensation expense in 2010. Additionally, during the three months ended September 30, 2010, the Company reversed $6,375 of previously-recognized stock-based compensation costs pertaining to option grants which management does not expect to vest. Management does not expect to recognize any compensation cost associated with these option grants. As of December 31, 2010, these option grants have an unrecognized compensation cost of $27,460.

The Company reduced the amount of stock-based compensation expense recognized in 2009 by $8,223 due to a change in management's estimate of when certain vesting targets are expected to be achieved.

As of December 31, 2011, there was approximately $48,123 of unrecognized compensation cost remaining, adjusted for estimated forfeitures, related to unvested employee stock options that the Company expects will vest. The Company estimates that compensation cost will be recognized according to the following schedule:

Period	Stock-Based Compensation Expense
2012	$	14,398
2013		12,704
2014		12,510
2015		3,846
2016		2,355
2017		2,310
	$	48,123

This table presents certain information relating to the Company's stock option plans for 2011, 2010, and 2009:

	Number of Shares			Weighted Avg. Price
Balance as of December 31, 2008		28,883,000		$	19.90
Granted		4,222,000			17.66
Exercised		(2,055,000	)		10.53
Expired or canceled		(2,086,000	)		21.87
Balance as of December 31, 2009		28,964,000		$	20.09
Granted		2,883,000			23.84
Exercised		(1,633,000	)		16.04
Expired or canceled		(2,333,000	)		23.68
Balance as of December 31, 2010		27,881,000		$	20.42
Granted		2,534,000			15.77
Exercised		(1,364,000	)		16.37
Expired or canceled		(2,008,000	)		22.07
Balance as of December 31, 2011		27,043,000		$	20.06
Exercisable as of December 31, 2011		11,680,000		$	17.22
Available for future grant as of December 31, 2011		4,622,000

As of December 31, 2010 and 2009, there were 14,247,000 and 11,801,000 shares exercisable, respectively. The expiration dates for options outstanding at December 31, 2011 range from December 10, 2012 to December 13, 2021 with a weighted average remaining contractual life of 5.9 years.

Upon exercise of stock options, the Company will issue new shares of its common shares. The Company does not hold any shares in treasury. The total intrinsic value of options exercised during 2011 and 2010 was $8,642 and $9,961, respectively. The aggregate intrinsic value of options exercisable as of December 31, 2011 was $1,534. The total options outstanding as of December 31, 2011 had no aggregate intrinsic value due to the fact that the weighted average exercise price exceeded the market value of the Company's common stock. The total intrinsic value for options outstanding and options exercisable is calculated as the difference between the market value of the Company's common stock as of December 31, 2011 and the exercise price of the shares. The market value of the Company's common stock as of December 31, 2011 was $17.35 as reported by the Nasdaq Stock Market, LLC.

This table summarizes information relating to all options outstanding and exercisable at December 31, 2011:

	Options Outstanding at December 31, 2011						Options Exercisable at December 31, 2011
Range of Exercise Prices (Per Share)	Number of Shares		Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Life (Years)		Number of Shares		Weighted Average Exercise Price (Per Share)		Weighted Average Remaining Contractual Life (Years)
$14.05 – 14.71		5,285,000	$	14.65		5.28		3,296,000	$	14.66		4.24
14.78 – 17.35		5,179,000		15.30		6.00		2,642,000		14.84		2.17
17.65 – 19.28		6,560,000		18.33		6.33		3,165,000		18.32		6.37
19.53 – 23.86		5,375,000		22.75		6.13		2,562,000		21.55		3.00
27.03 – 32.49		4,644,000		30.88		5.46		15,000		27.03		5.00
		27,043,000						11,680,000

As of December 31, 2011 and 2010, there was $142,872 and $141,438, respectively, available in the pool of windfall tax benefits.

Employee Stock Purchase Plan

The Company has an employee stock purchase plan that provides for offerings of common stock to eligible employees at a price equal to 85 percent of the fair market value of the stock at the end of the stock purchase period, as defined. The Company has reserved 15,600,000 shares for issuance under this plan. At December 31, 2011, 11,474,000 cumulative shares have been issued. Costs incurred by the Company related to the employee stock purchase plan were immaterial in 2011, 2010 and 2009.

Common Stock Buyback

The Board of Directors, under multiple authorizations, has authorized the purchase of the Company's common stock on the open market or through private transactions. As of January 31, 2012, the Company had approximately $95,823 of authorization remaining for the purchase of common stock. The following table provides the total number of shares repurchased and the related total costs in 2011, 2010 and 2009:

Year	Total Number of Shares Repurchased		Total Cost
2011		11,109,000	$	211,165
2010		5,814,000		120,982
2009		3,198,000		54,114

The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value.

Rights Agreement

In December 2008, the Company's Board of Directors declared a dividend distribution pursuant to a Rights Agreement (the Rights Agreement) which became effective on January 6, 2009. The purpose of the Rights Agreement is to deter coercive or unfair takeover tactics and to prevent a person or group (an Acquiring Person) from acquiring control of the Company without offering a fair price to all shareholders. Under the Rights Agreement, all common shareholders receive one Right for each common share outstanding. Each Right entitles the registered holder to purchase from the Company a unit consisting of one twenty-thousandths of a share of Series A Junior Participating Preferred Shares, $.05 par value per share, or a combination of securities and assets of equivalent value, at a purchase price of $150.00 per unit, subject to adjustment. The Rights will become exercisable and trade separately from the common stock ten days following a public announcement that an Acquiring Person has beneficial ownership of more than 20 percent of the outstanding common stock of the Company or the commencement of a tender or exchange offer that would result in an Acquiring Person owning 20 percent or more of the outstanding common stock of the Company. Upon exercise, holders, other than an Acquiring Person, will have the right to purchase the common stock of the Company equal to twice the value of the exercise price of the Rights. In lieu of requiring payment of the purchase price upon exercise of the Rights following certain events, the Company may permit the holders simply to surrender the Rights, in which event they will be entitled to receive common shares and other property, as the case may be, with a value of 50 percent of what could be purchased by payment of the full purchase price. The Rights, which do not have voting rights, will expire on January 6, 2019, and may be redeemed by the Company any time until ten days following the announcement of an Acquiring Person at a price of $.01 per Right.

Cash Dividends

On May 25, 2011, the Board of Directors declared a cash dividend of $.12 per share on the Company's common stock, which was paid on June 28, 2011, to shareholders of record on June 20, 2011. On December 13, 2011, the Board of Directors declared a cash dividend of $.15 per share on the Company's common stock, which was paid on January 6, 2012, to shareholders of record on December 28, 2011.

The cash dividends declared in 2011, 2010, and 2009 were $48,558, $37,513, and $32,422, respectively. The Board of Directors has indicated its intention to declare future cash dividends on a semiannual basis.

Noncontrolling Interest

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Statements of Changes in Equity:

Year Ended December 31,	2011			2010			2009
Noncontrolling interest
Beginning balance	$	15,155		$	121,895		$	109,722
Net income attributable to noncontrolling interest		1,691			1,633			98,097
Foreign currency translation adjustments		(703	)		685			1,797
Deconsolidation of LSV		0			(65,522	)		0
Deconsolidation of LSV Employee Group		0			(43,536	)		0
Distributions to noncontrolling interests		0			0			(87,337	)
Other		0			0			(384	)
Ending balance	$	16,143		$	15,155		$	121,895

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Commitments And Contingencies (Schedule Of Noncancellable Minimum Commitments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments And Contingencies [Abstract]
Rent expense	$ 19,760	$ 17,210	$ 19,022
2012	17,892
2013	13,527
2014	6,997
2015	1,955
2016 and thereafter	10,419
Operating leases, future minimum payments due	$ 50,790

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Income Taxes (Schedule Of Federal And State And Foreign Income Tax Provision) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Income Taxes [Abstract]
Federal, current	$ 99,448		$ 116,388		$ 16,012
State, current	7,067		8,698		664
Foreign, current	4,603		3,365		5,412
Current federal, state and foreign income tax	111,118		128,451		22,088
Federal, deferred	(2,317)		6,085		61,443
State, deferred	2,477		1,509		5,822
Foreign, deferred	6		0		0
Deferred income tax expense (benefit)	166		7,594		67,265
Income taxes attributable to the Noncontrolling interest	553	[1]	416	[1]	533	[1]
Total income taxes	$ 111,837		$ 136,461		$ 89,886

[1] There is no income tax provision for LSV due to its partnership structure.

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Employee Benefit Plan (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Benefit Plan [Abstract]
Defined contribution plan, cost recognized	$ 4,783	$ 4,496	$ 4,327

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Schedule Of Federal And State And Foreign Income Tax Provision

Year Ended December 31,	2011			2010		2009
Current
Federal	$	99,448		$	116,388	$	16,012
State		7,067			8,698		664
Foreign		4,603			3,365		5,412
		111,118			128,451		22,088
Deferred, including current deferred
Federal		(2,317	)		6,085		61,443
State		2,477			1,509		5,822
Foreign		6			0		0
		166			7,594		67,265
Income taxes attributable to the Noncontrolling interest (1)		553			416		533
Total income taxes	$	111,837		$	136,461	$	89,886

(1) There is no income tax provision for LSV due to its partnership structure.

Components Of Net Income Before Income Taxes

Year Ended December 31,	2011		2010		2009
Domestic	$	309,391	$	360,937	$	255,390
Foreign		6,852		6,795		8,300
	$	316,243	$	367,732	$	263,690

Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate

Year Ended December 31,	2011			2010			2009
Statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of Federal tax benefit		2.0			2.0			1.5
Foreign tax expense and tax rate differential		0.6			0.4			1.1
Research and development tax credit		(0.7	)		(0.5	)		(0.8	)
Domestic Production Activities Deduction		(0.7	)		0			0
Domestic Production Activities Deduction, prior years, net		(1.5	)		0			0
Net change in uncertain tax positions(2)		0.4			0.2			(2.7	)
Other, net		0.1			(0.1	)		(0.2	)
		35.2	%		37.0	%		33.9	%

(2) For 2011, 0.25 percent relates to federal issues, 0.14 percent relates to state tax issues and the remaining 0.01 relates to foreign tax issues. For 2010, 0.14 percent relates to federal issues and the remaining 0.06 percent relates to state tax issues. For 2009, 2.0 percent relates to research and development tax credit settled with the Internal Revenue Service (IRS), 0.5 percent relates to federal issues settled with the IRS and the remaining 0.2 percent relates to state tax issues.

Schedule Of Deferred Income Tax Provision

Year Ended December 31,	2011			2010			2009
Difference in financial reporting and income tax depreciation methods	$	860		$	1,381		$	(86	)
Reserves not currently deductible		651			774			394
Reserves for Capital Support Agreements and basis difference in SIV securities		(3,336	)		4,822			60,491
Capitalized software currently deductible for tax purposes, net of amortization		5,157			5,734			2,876
State deferred income taxes		1,300			1,519			2,394
Revenue and expense recognized in different periods for financial reporting and income tax purposes		(1,188	)		(562	)		(122	)
Stock-based compensation expense		(3,101	)		(7,457	)		(4,386	)
Uncertain tax positions		(182	)		(106	)		2,861
Other, net		5			1,489			2,843
	$	166		$	7,594		$	67,265

Schedule Of Deferred Income Tax Liabilities

Year Ended December 31,	2011			2010
Current deferred income taxes:
Gross assets	$	1,151		$	1,388
Gross liabilities		(1	)		(1	)
		1,150			1,387
Valuation allowance		0			0
		1,150			1,387
Long-term deferred income taxes:
Gross assets		63,374			59,892
Gross liabilities		(148,540	)		(143,137	)
		(85,166	)		(83,245	)
Valuation allowance		(8,585	)		(9,008	)
		(93,751	)		(92,253	)
Net deferred income tax liability	$	(92,601	)	$	(90,866	)

Tax Effect Of Significant Temporary Differences Representing Deferred Tax Liabilities

Year Ended December 31,	2011			2010
Difference in financial reporting and income tax depreciation methods	$	(13,600	)	$	(11,402	)
Reserves not currently deductible		374			472
Capitalized software currently deductible for tax purposes, net of amortization		(139,455	)		(132,030	)
State deferred income taxes		6,717			5,337
Revenue and expense recognized in different periods for financial reporting and income tax purposes		3,149			3,015
Unrealized holding loss (gain) on investments		(927	)		(5,292	)
Stock-based compensation expense		43,879			40,096
State net operating loss carryforward		14,485			16,634
Valuation allowance on deferred tax assets		(8,585	)		(9,008	)
Federal benefit of state tax deduction for uncertain tax positions		1,725			1,542
Other, net		(363	)		(230	)
Net deferred income tax liability	$	(92,601	)	$	(90,866	)

Unrecognized Tax Benefit

	2011			2010			2009
Balance as of January 1	$	5,723		$	4,989		$	13,453
Tax positions related to current year:
Gross additions		2,392			1,372			1,905
Gross reductions		0			0			0
		2,392			1,372			1,905
Tax positions related to prior years:
Gross additions		1,992			0			0
Gross reductions		0			(104	)		0
		1,992			(104	)		0
Settlements		0			(102	)		(9,888	)
Lapses on statute of limitations		(697	)		(432	)		(481	)
Balance as of December 31	$	9,410		$	5,723		$	4,989

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Marketable Securities (Investments Available For Sale) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	$ 78,916	$ 72,647
Investment Available for Sale, Gross Unrealized Gains	4,452	2,137
Investment Available for Sale, Gross Unrealized Losses	(360)	(14)
Investment Available for Sale, Fair Value	83,008	74,770
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	8,243	5,086
Investment Available for Sale, Gross Unrealized Gains	48	279
Investment Available for Sale, Gross Unrealized Losses	(360)	(14)
Investment Available for Sale, Fair Value	7,931	5,351
Other Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	69	443
Investment Available for Sale, Gross Unrealized Gains	10	59
Investment Available for Sale, Gross Unrealized Losses	0	0
Investment Available for Sale, Fair Value	79	502
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment Available for Sale, Cost Amount	70,604	67,118
Investment Available for Sale, Gross Unrealized Gains	4,394	1,799
Investment Available for Sale, Gross Unrealized Losses	0	0
Investment Available for Sale, Fair Value	$ 74,998	$ 68,917

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Business Segment Information

12 Months Ended

Dec. 31, 2011

Business Segment Information [Abstract]

Business Segment Information

Note 13 – Business Segment Information:

The Company's reportable business segments are:

Private Banks – provides investment processing and investment management programs to banks and trust institutions worldwide, independent wealth advisers located in the United Kingdom, and financial advisors in Canada;

Investment Advisors – provides investment management programs to affluent investors through a network of independent registered investment advisors, financial planners, and other investment professionals in the United States;

Institutional Investors – provides investment management programs and administrative outsourcing solutions to retirement plan sponsors, hospitals, and not-for-profit organizations worldwide;

Investment Managers – provides investment operations outsourcing solutions to investment managers, fund companies and banking institutions located in the United States, and to investment managers worldwide of alternative asset classes such as hedge funds, funds of hedge funds, and private equity funds across both registered and partnership structures; and

Investments in New Businesses – provides investment management programs to ultra-high-net-worth families residing in the United States through the SEI Wealth Network® and conducts other research and development activities.

In January 2010, the Company deconsolidated the assets, liabilities and operations of LSV Asset Management. As a result, LSV is no longer considered a reportable business segment beginning in 2010.

In 2011 and 2010, no single customer accounted for more than ten percent of revenues in any business segment.

The following tables highlight certain financial information about each of the Company's business segments for the years ended December 31, 2011, 2010, and 2009:

2011

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
Revenues	$	348,122		$	189,780		$	210,027		$	177,975		$	3,823		$	929,727
Expenses		339,339			110,438			106,585			115,963			11,559			683,884
Operating profit (loss)	$	8,783		$	79,342		$	103,442		$	62,012		$	(7,736	)	$	245,843
Profit margin		3	%		42	%		49	%		35	%		N/A			26	%

2010

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
Revenues	$	346,668		$	183,378		$	206,531		$	160,159		$	4,099		$	900,835
Expenses		310,633			110,388			106,934			103,421			12,676			644,052
Operating profit (loss)	$	36,035		$	72,990		$	99,597		$	56,738		$	(8,577	)	$	256,783
Profit margin		10	%		40	%		48	%		35	%		N/A			29	%

2009

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			LSV			Total
Revenues	$	361,273		$	166,097		$	177,721		$	139,004		$	4,492		$	211,961		$	1,060,548
Expenses (1)		309,300			109,418			99,924			93,074			11,625			136,580			759,921
Operating profit (loss)	$	51,973		$	56,679		$	77,797		$	45,930		$	(7,133	)	$	75,381		$	300,627
Profit margin		14	%		34	%		44	%		33	%		N/A			36	%		28	%

(1) For the year ended December 31, 2009, LSV includes $105,471 of noncontrolling interest of the other partners of LSV.

A reconciliation of the total reported for the business segments to income from operations in the Consolidated Statements of Operations for the years ended December 31, 2011, 2010, and 2009 is as follows:

Year Ended December 31,	2011			2010			2009
Total operating profit from segments above	$	245,843		$	256,783		$	300,627
Corporate overhead expenses		(43,398	)		(40,715	)		(36,529	)
Noncontrolling interest reflected in segments		1,620			1,465			106,905
LSV Employee Group expenses (2)		0			0			(7,296	)
Income from operations	$	204,065		$	217,533		$	363,707

(2) Includes $7,222 in 2009 of amortization expense related to intangible assets.

The following tables provide additional information for the years ended December 31, 2011, 2010, and 2009 pertaining to our business segments:

	Capital Expenditures						Depreciation
Year Ended December 31,	2011		2010		2009		2011		2010		2009
Private Banks	$	35,045	$	32,982	$	39,364	$	15,648	$	15,704	$	15,415
Investment Advisors		11,933		11,691		13,607		2,251		2,384		2,286
Institutional Investors		2,059		2,601		2,665		1,079		1,170		1,108
Investment Managers		3,081		3,659		4,306		1,809		1,891		1,580
Investments in New Businesses		577		608		831		114		148		176
LSV		0		0		1,358		0		0		395
Total from business segments	$	52,695	$	51,541	$	62,131	$	20,901	$	21,297	$	20,960
Corporate Overhead		530		799		1,085		570		605		571
	$	53,225	$	52,340	$	63,216	$	21,471	$	21,902	$	21,531

	Amortization
Year Ended December 31,	2011		2010		2009
Private Banks	$	18,081	$	15,100	$	24,058
Investment Advisors		6,201		5,467		8,550
Institutional Investors		864		1,213		927
Investment Managers		580		820		688
Investments in New Businesses		433		477		1,897
LSV		0		0		436
Total from business segments	$	26,159	$	23,077	$	36,556
LSV Employee Group		0		0		7,280
Corporate Overhead		1,129		971		772
	$	27,288	$	24,048	$	44,608

	Total Assets
	2011		2010
Private Banks	$	457,333	$	460,261
Investment Advisors		119,053		113,111
Institutional Investors		80,133		72,867
Investment Managers		95,760		96,378
Investments in New Businesses		5,962		6,801
Total from business segments	$	758,241	$	749,418
Corporate Overhead (3)		536,318		627,805
	$	1,294,559	$	1,377,223

(3) Unallocated assets primarily consist of cash and cash equivalents, marketable securities, and certain other shared services assets.

The following table presents revenues based on the location of the use of the products or services:

For the Year Ended December 31,	2011		2010		2009
United States	$	785,506	$	767,068	$	950,891
International operations		144,221		133,767		109,657
	$	929,727	$	900,835	$	1,060,548

The following table presents assets based on their location:

	2011		2010
United States	$	1,098,643	$	1,193,775
International operations		195,916		183,448
	$	1,294,559	$	1,377,223

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Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies [Abstract]

Calculation Of Basic And Diluted Earnings Per Share

	For the Year ended December 31, 2011
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	204,959		182,547	$	1.12
Dilutive effect of stock options		0		1,580
Diluted earnings per common share	$	204,959		184,127	$	1.11

	For the Year ended December 31, 2010
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	231,687		188,468	$	1.23
Dilutive effect of stock options		0		1,853
Diluted earnings per common share	$	231,687		190,321	$	1.22

	For the Year ended December 31, 2009
	Net income attributable to SEI (Numerator)		Shares (Denominator)		Per-Share Amount
Basic earnings per common share	$	174,335		190,821	$	0.91
Dilutive effect of stock options		0		962
Diluted earnings per common share	$	174,335		191,783	$	0.91

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Fair Value Measurements (Reconciliation For All Assets And Liabilities Company Measured At Fair Value On Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) (Trading Securities [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Trading Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 100,645	$ 120,714
Purchases	1,215	536
Issuances	0	0
Principal prepayments and settlements	(17,921)	(45,857)
Sales	(34,706)	(18,995)
Total gains or (losses) (realized/unrealized), included in earnings	3,390	44,247
Total gains or (losses) (realized/unrealized), included in other comprehensive income	0	0
Transfers in and out of Level 3	0	0
Ending balance	$ 52,623	$ 100,645

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Investment In Unconsolidated Affiliate (Condensed Balance Sheet Of LSV) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Investments in and Advances to Affiliates [Line Items]
Cash and cash equivalents	$ 420,986	$ 496,292	$ 590,877	$ 416,643
Accounts receivable, net of allowance for doubtful accounts of $804 and $369	142,109	136,490
Total Assets	1,294,559	1,377,223
Current liabilities	151,073	127,600
Total liabilities and partners' capital	1,294,559	1,377,223
Less: doubtful accounts	924	1,195
Investment In Unconsolidated Affiliate [Member]
Investments in and Advances to Affiliates [Line Items]
Cash and cash equivalents	60,728	64,464
Accounts receivable, net of allowance for doubtful accounts of $804 and $369	75,269	75,056
Prepaid expenses and other current assets	604	848
Non-current assets	3,880	4,159
Total Assets	140,481	144,527
Current liabilities	13,933	11,199
Partners' capital	126,548	133,328
Total liabilities and partners' capital	140,481	144,527
Less: doubtful accounts	$ 804	$ 369

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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 206,650	$ 233,320	$ 272,432
Other comprehensive (loss) gain, net of tax:
Foreign currency translation adjustments	(3,195)	2,205	8,734
Unrealized holding gain on investments:
Unrealized holding gains during the period, net of income taxes of $(811), $(486) and $(1,065)	1,369	484	2,124
Less: reclassification adjustment for (gains) losses realized in net income, net of income taxes of $77, $56 and $(222)	(134)	(105)	360
Total other comprehensive (loss) gain, net of taxes	(1,960)	2,584	11,218
Comprehensive income	204,690	235,904	283,650
Less: Comprehensive income attributable to noncontrolling interest	(988)	(2,318)	(99,894)
Comprehensive income attributable to SEI Investments	$ 203,702	$ 233,586	$ 183,756

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Investment In Unconsolidated Affiliate

12 Months Ended

Dec. 31, 2011

Investment In Unconsolidated Affiliate [Abstract]

Investment In Unconsolidated Affiliate

Note 2 – Investment in Unconsolidated Affiliate

The Company has an investment in LSV, a general partnership and registered investment advisor that provides investment advisory services to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a number of SEI-sponsored mutual funds. As of December 31, 2011, the Company's total partnership interest in LSV was approximately 41 percent.

LSV Employee Group is owned by several current employees of LSV and was formed for the sole purpose of owning a partnership interest in LSV. The Company does not own any interest in LSV Employee Group. In 2006, LSV Employee Group purchased an eight percent interest in LSV from two existing partners. LSV Employee Group obtained financing in the form of a term loan pursuant to the terms of a Credit Agreement to purchase the eight percent interest in LSV. The Company agreed to provide a Guaranty Agreement to the lenders of all obligations of LSV Employee Group under the Credit Agreement. The lenders have the right to seek payment from the Company of all obligations of LSV Employee Group under the Credit Agreement in the event of default. The Company's direct interest in LSV was unchanged as a result of this transaction.

As a result of providing the Guaranty Agreement, LSV Employee Group became a VIE and the Company was considered the primary beneficiary. Also, given the Company's direct ownership of 43 percent in LSV at the time of this transaction in 2006 and its controlling interest in LSV Employee Group through the Guaranty Agreement, the Company was required to consolidate the assets, liabilities and operations of LSV and LSV Employee Group. The partnership interest of the other existing partners of LSV was included in Noncontrolling interest.

In January 2010, new accounting guidance pertaining to the consolidation of VIEs became effective. Under the new guidance, the Company was not considered the primary beneficiary of LSV Employee Group. The Company, therefore, discontinued consolidating the accounts and operations of LSV and LSV Employee Group in its financial statements. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company's interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheet and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statement of Operations. The deconsolidation of LSV had no effect on Net income attributable to SEI. Prior period financial statements are not reclassified for the new accounting guidance.

LSV Asset Management

At December 31, 2011, the Company's total investment in LSV was $60,954. The investment in LSV exceeded the underlying equity in the net assets of LSV by $3,717, of which $3,062 is considered goodwill embedded in the investment. The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distribution payments from LSV for $109,273, $93,302 and $73,518 in 2011, 2010 and 2009, respectively. The partnership distribution payment of $21,242 received in January 2010 is reflected in LSV and LSV Employee Group cash balances, net on the accompanying Consolidated Statement of Cash Flows.

These tables contain condensed financial information of LSV:

Condensed Statement of Operations Year ended December 31,	2011		2010
Revenues	$	296,397	$	273,381
Net income	$	257,519	$	239,981

Condensed Balance Sheet December 31,	2011		2010
Cash and cash equivalents	$	60,728	$	64,464
Accounts receivable, net of allowance for doubtful accounts of $804 and $369		75,269		75,056
Prepaid expenses and other current assets		604		848
Non-current assets		3,880		4,159
Total assets	$	140,481	$	144,527
Current liabilities	$	13,933	$	11,199
Partners' capital		126,548		133,328
Total liabilities and partners' capital	$	140,481	$	144,527

LSV Employee Group

At the time of LSV Employee Group's purchase of an eight percent interest in LSV, it was determined that $72,220 of the purchase price related to identifiable intangible assets and $19,780 was goodwill. The identifiable intangible assets have an estimated useful life of ten years and were amortized on a straight-line basis. Prior to the deconsolidation of LSV Employee Group from the Company's financial statements, amortization expense in 2009 on the accompanying Consolidated Statement of Operations included $7,222 pertaining to the amortization of the intangible assets, but was eliminated through Noncontrolling interest and had no impact on net income.

In order to finance a portion of the purchase price, LSV Employee Group obtained financing from Bank of America, N.A. (Bank of America) and certain other lenders in the form of a term loan pursuant to the terms of a Credit Agreement. The principal amount of the term loan was $82,800. In January 2011, LSV Employee Group and Bank of America agreed to amend the Credit Agreement and extend the maturity date of the loan from January 2011 to July 2012. The Company's obligations under the Guaranty Agreement remained in full force and effect with respect to the amended Credit Agreement. LSV Employee Group made the final principal payment of the term loan in October 2011 and the Company has no further obligation regarding the Credit Agreement. LSV Employee Group made principal payments of $10,091 and $10,461 during 2011 and 2010.

Prior to the deconsolidation of LSV Employee Group from the Company's financial statements, interest expense in 2009 on the Consolidated Statement of Operations includes $1,510 in interest costs related to the term loan which were eliminated through Noncontrolling interest and had no impact on net income.

LSV Employee Group II

In April 2011, a group of existing employees of LSV agreed to purchase a partnership interest of an existing LSV employee for $4,300 of which $3,655 was financed through a new term loan with Bank of America. The group of existing LSV employees formed a new limited liability company, LSV Employee Group II, LLC (LSV Employee Group II). The Company provided an unsecured guaranty to the lenders of all the obligations of LSV Employee Group II. The lenders will have the right to seek payment from the Company in the event of a default by LSV Employee Group II. The term loan has a four year term and will be repaid from the quarterly distributions of LSV. LSV Employee Group II made principal payments of $458 during 2011. As of December 31, 2011, the remaining unpaid principal balance of the term loan was $3,197. This amount is not reflected, nor is it required to be reflected, in the Company's Consolidated Balance Sheet at December 31, 2011.

The Company's direct interest in LSV was unchanged as a result of this transaction. The Company has determined that LSV Employee Group II is a variable interest entity (VIE); however, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group II either directly or through any financial responsibility from the guaranty.

In January 2012, LSV Employee Group II made a principal payment of $219. As of January 31, 2012, the remaining unpaid principal balance of the term loan was $2,978. The Company, in its capacity as guarantor, currently has no obligation of payment relating to the term loan of LSV Employee Group II and, furthermore, fully expects that LSV Employee Group II will meet all of their future obligations regarding the term loan.

Proforma Financial Information (Unaudited)

The unaudited proforma financial information for the year ended December 31, 2009 presents the historical results of the Company as if the accounts and operations of LSV and LSV Employee Group had not been consolidated and LSV had been accounted for under the equity method. Net income attributable to SEI was unchanged due to this transaction but is presented for the purpose of clarification.

Proforma Unaudited Condensed Statement of Operations Year ended December 31,	2009
Revenues	$	848,587
Expenses		(658,434	)
Income from operations		190,153
Other income, net		87
Equity in the earnings of unconsolidated affiliate		75,415
Net income before income taxes		265,655
Income taxes		89,886
Net income		175,769
Less: Net income attributable to the noncontrolling interest		(1,434	)
Net income attributable to SEI Investments	$	174,335

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Shareholders' Equity (Stock Option Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance	27,043,000
Exercisable shares	11,680,000	14,247,000	11,801,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance	27,881,000	28,964,000	28,883,000
Balance, weighted avg. price	$ 20.42	$ 20.09	$ 19.90
Granted	2,534,000	2,883,000	4,222,000
Granted, weighted avg. price	$ 15.77	$ 23.84	$ 17.66
Exercised	(1,364,000)	(1,633,000)	(2,055,000)
Exercised, weighted avg. price	$ 16.37	$ 16.04	$ 10.53
Expired or canceled	(2,008,000)	(2,333,000)	(2,086,000)
Expired or canceled, weighted avg. price	$ 22.07	$ 23.68	$ 21.87
Balance	27,043,000	27,881,000	28,964,000
Balance, weighted avg. price	$ 20.06	$ 20.42	$ 20.09
Exercisable shares	11,680,000
Exercisable shares, weighted avg. price	$ 17.22
Available for future grant as of December 31, 2011	4,622,000

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Income Taxes (Schedule Of Deferred Income Tax Provision) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Difference in financial reporting and income tax depreciation methods	$ 860	$ 1,381	$ (86)
Reserves not currently deductible	651	774	394
Reserves for Capital Support Agreements and basis difference in SIV securities	(3,336)	4,822	60,491
Capitalized software currently deductible for tax purposes, net of amortization	5,157	5,734	2,876
State deferred income taxes	1,300	1,519	2,394
Revenue and expense recognized in different periods for financial reporting and income tax purposes	(1,188)	(562)	(122)
Stock-based compensation expense	(3,101)	(7,457)	(4,386)
Uncertain tax positions	(182)	(106)	2,861
Other, net	5	1,489	2,843
Deferred income tax expense (benefit)	$ 166	$ 7,594	$ 67,265

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Investment In Unconsolidated Affiliate (Tables)

12 Months Ended

Dec. 31, 2011

Investment In Unconsolidated Affiliate [Abstract]

Condensed Statement Of Operations Of LSV

Condensed Statement of Operations Year ended December 31,	2011		2010
Revenues	$	296,397	$	273,381
Net income	$	257,519	$	239,981

Condensed Balance Sheet Of LSV

Condensed Balance Sheet December 31,	2011		2010
Cash and cash equivalents	$	60,728	$	64,464
Accounts receivable, net of allowance for doubtful accounts of $804 and $369		75,269		75,056
Prepaid expenses and other current assets		604		848
Non-current assets		3,880		4,159
Total assets	$	140,481	$	144,527
Current liabilities	$	13,933	$	11,199
Partners' capital		126,548		133,328
Total liabilities and partners' capital	$	140,481	$	144,527

Unaudited Proforma Financial Information

Proforma Unaudited Condensed Statement of Operations Year ended December 31,	2009
Revenues	$	848,587
Expenses		(658,434	)
Income from operations		190,153
Other income, net		87
Equity in the earnings of unconsolidated affiliate		75,415
Net income before income taxes		265,655
Income taxes		89,886
Net income		175,769
Less: Net income attributable to the noncontrolling interest		(1,434	)
Net income attributable to SEI Investments	$	174,335

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Business Segment Information (Financial Information About Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Revenues	$ 226,247	$ 233,227	$ 237,760	$ 232,493	$ 231,399	$ 219,513	$ 228,388	$ 221,535	$ 929,727	$ 900,835	$ 1,060,548
Expenses									683,884	644,052	759,921	[1]
Operating profit (loss)									245,843	256,783	300,627
Profit margin									26.00%	29.00%	28.00%
Amount included in segment attributable to other partners											105,471
LSV [Member]
Segment Reporting Information [Line Items]
Revenues											211,961
Expenses											136,580	[1]
Operating profit (loss)											75,381
Profit margin											36.00%
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues									348,122	346,668	361,273
Expenses									339,339	310,633	309,300	[1]
Operating profit (loss)									8,783	36,035	51,973
Profit margin									3.00%	10.00%	14.00%
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues									189,780	183,378	166,097
Expenses									110,438	110,388	109,418	[1]
Operating profit (loss)									79,342	72,990	56,679
Profit margin									42.00%	40.00%	34.00%
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues									210,027	206,531	177,721
Expenses									106,585	106,934	99,924	[1]
Operating profit (loss)									103,442	99,597	77,797
Profit margin									49.00%	48.00%	44.00%
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues									177,975	160,159	139,004
Expenses									115,963	103,421	93,074	[1]
Operating profit (loss)									62,012	56,738	45,930
Profit margin									35.00%	35.00%	33.00%
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues									3,823	4,099	4,492
Expenses									11,559	12,676	11,625	[1]
Operating profit (loss)									$ (7,736)	$ (8,577)	$ (7,133)
Profit margin									0.00%	0.00%	0.00%

[1] For the year ended December 31, 2009, LSV includes $105,471 of noncontrolling interest of the other partners of LSV.

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Summary Of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]
Basic earnings per common share, Income (Numerator)	$ 44,396	$ 49,232	$ 53,603	$ 57,728	$ 62,400	$ 56,389	$ 53,478	$ 59,420	$ 204,959	$ 231,687	$ 174,335
Basic earnings per common share, Shares (Denominator)									182,547	188,468	190,821
Basic earnings per common share, Per Share Amount	$ 0.25	$ 0.27	$ 0.29	$ 0.31	$ 0.33	$ 0.30	$ 0.28	$ 0.31	$ 1.12	$ 1.23	$ 0.91
Dilutive effect of stock options, Income (Numerator)									0	0	0
Dilutive effect of stock options, Shares (Denominator)									1,580	1,853	962
Diluted earnings per common share, Income (Numerator)									$ 204,959	$ 231,687	$ 174,335
Diluted earnings per common share, Shares (Denominator)									184,127	190,321	191,783
Diluted earnings per common share, Per Share Amount	$ 0.25	$ 0.27	$ 0.29	$ 0.31	$ 0.33	$ 0.30	$ 0.28	$ 0.31	$ 1.11	$ 1.22	$ 0.91

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Income Taxes

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Income Taxes

Note 12 – Income Taxes:

The federal and state and foreign income tax provision is summarized as follows:

Year Ended December 31,	2011			2010		2009
Current
Federal	$	99,448		$	116,388	$	16,012
State		7,067			8,698		664
Foreign		4,603			3,365		5,412
		111,118			128,451		22,088
Deferred, including current deferred
Federal		(2,317	)		6,085		61,443
State		2,477			1,509		5,822
Foreign		6			0		0
		166			7,594		67,265
Income taxes attributable to the Noncontrolling interest (1)		553			416		533
Total income taxes	$	111,837		$	136,461	$	89,886

(1) There is no income tax provision for LSV due to its partnership structure.

Annual tax provisions include amounts considered sufficient to pay assessments that may result from examination of prior year tax returns; however, the amount ultimately paid upon resolution of issues raised may differ materially from the amount accrued. The examination and the resolution process may last longer than one year.

The components of Net income before income taxes are summarized as follows:

Year Ended December 31,	2011		2010		2009
Domestic	$	309,391	$	360,937	$	255,390
Foreign		6,852		6,795		8,300
	$	316,243	$	367,732	$	263,690

The effective income tax rate differs from the federal income tax statutory rate due to the following:

Year Ended December 31,	2011			2010			2009
Statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of Federal tax benefit		2.0			2.0			1.5
Foreign tax expense and tax rate differential		0.6			0.4			1.1
Research and development tax credit		(0.7	)		(0.5	)		(0.8	)
Domestic Production Activities Deduction		(0.7	)		0			0
Domestic Production Activities Deduction, prior years, net		(1.5	)		0			0
Net change in uncertain tax positions(2)		0.4			0.2			(2.7	)
Other, net		0.1			(0.1	)		(0.2	)
		35.2	%		37.0	%		33.9	%

(2) For 2011, 0.25 percent relates to federal issues, 0.14 percent relates to state tax issues and the remaining 0.01 relates to foreign tax issues. For 2010, 0.14 percent relates to federal issues and the remaining 0.06 percent relates to state tax issues. For 2009, 2.0 percent relates to research and development tax credit settled with the Internal Revenue Service (IRS), 0.5 percent relates to federal issues settled with the IRS and the remaining 0.2 percent relates to state tax issues.

Undistributed earnings of the Company's foreign subsidiaries amounted to approximately $61,194 at December 31, 2011. Those earnings are considered to be indefinitely reinvested and, accordingly, no U.S. federal and state income taxes have been provided thereon. Upon distribution of those earnings, in the form of dividends or otherwise, the Company would be subject to both U.S. income taxes, subject to an adjustment for foreign tax credits, and withholding taxes payable to the various foreign countries. Determination of the amount of unrecognized deferred U.S. income tax liability is not practicable because of the complexities associated with its hypothetical calculation, including the availability, or lack thereof, of foreign tax credits to reduce a portion of the U.S. liability.

Deferred income taxes for 2011, 2010, and 2009 reflect the impact of temporary differences between the amount of assets and liabilities for financial reporting purposes and such amounts as measured by tax laws and regulations. Principal items comprising the deferred income tax provision are:

Year Ended December 31,	2011			2010			2009
Difference in financial reporting and income tax depreciation methods	$	860		$	1,381		$	(86	)
Reserves not currently deductible		651			774			394
Reserves for Capital Support Agreements and basis difference in SIV securities		(3,336	)		4,822			60,491
Capitalized software currently deductible for tax purposes, net of amortization		5,157			5,734			2,876
State deferred income taxes		1,300			1,519			2,394
Revenue and expense recognized in different periods for financial reporting and income tax purposes		(1,188	)		(562	)		(122	)
Stock-based compensation expense		(3,101	)		(7,457	)		(4,386	)
Uncertain tax positions		(182	)		(106	)		2,861
Other, net		5			1,489			2,843
	$	166		$	7,594		$	67,265

The net deferred income tax liability is comprised of:

Year Ended December 31,	2011			2010
Current deferred income taxes:
Gross assets	$	1,151		$	1,388
Gross liabilities		(1	)		(1	)
		1,150			1,387
Valuation allowance		0			0
		1,150			1,387
Long-term deferred income taxes:
Gross assets		63,374			59,892
Gross liabilities		(148,540	)		(143,137	)
		(85,166	)		(83,245	)
Valuation allowance		(8,585	)		(9,008	)
		(93,751	)		(92,253	)
Net deferred income tax liability	$	(92,601	)	$	(90,866	)

The valuation allowances against deferred tax assets at December 31, 2011 and 2010 are related to state net operating losses from certain domestic subsidiaries. Certain state tax statutes significantly limit the utilization of net operating losses for domestic subsidiaries. Furthermore, these net operating losses cannot be used to offset the net income of other subsidiaries. As of December 31, 2010, the Company fully utilized its capital loss carryforward in the amount of $4,256.

The tax effect of significant temporary differences representing deferred tax liabilities is:

Year Ended December 31,	2011			2010
Difference in financial reporting and income tax depreciation methods	$	(13,600	)	$	(11,402	)
Reserves not currently deductible		374			472
Capitalized software currently deductible for tax purposes, net of amortization		(139,455	)		(132,030	)
State deferred income taxes		6,717			5,337
Revenue and expense recognized in different periods for financial reporting and income tax purposes		3,149			3,015
Unrealized holding loss (gain) on investments		(927	)		(5,292	)
Stock-based compensation expense		43,879			40,096
State net operating loss carryforward		14,485			16,634
Valuation allowance on deferred tax assets		(8,585	)		(9,008	)
Federal benefit of state tax deduction for uncertain tax positions		1,725			1,542
Other, net		(363	)		(230	)
Net deferred income tax liability	$	(92,601	)	$	(90,866	)

The Company recognizes tax liabilities in accordance with the applicable accounting guidance and adjusts these liabilities when management's judgment changes as a result of the evaluation of new information not previously available. Due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different than from our current estimate of the tax liabilities. The Company's total unrecognized tax benefit, not including interest and penalties, as of December 31, 2011 was $9,410, of which $8,320 would affect the effective tax rate if the Company were to recognize the tax benefit. The gross amount of uncertain tax liability of $1,768 which is expected to be paid within one year is included in Current liabilities while the remaining amount of $8,276 is included in Other long-term liabilities on the accompanying Consolidated Balance Sheets. During the year ended December 31, 2011, the Company recognized $697 of previously unrecognized tax benefits relating to the lapse of the statute of limitation for certain state filings.

The Company files a consolidated federal income tax return and separate income tax returns with various states. Certain subsidiaries of the Company file tax returns in foreign jurisdictions. The Company is no longer subject to U.S. federal income tax examination for years before 2008 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2006.

A reconciliation of the beginning and ending amount of unrecognized tax benefit is as follows:

	2011			2010			2009
Balance as of January 1	$	5,723		$	4,989		$	13,453
Tax positions related to current year:
Gross additions		2,392			1,372			1,905
Gross reductions		0			0			0
		2,392			1,372			1,905
Tax positions related to prior years:
Gross additions		1,992			0			0
Gross reductions		0			(104	)		0
		1,992			(104	)		0
Settlements		0			(102	)		(9,888	)
Lapses on statute of limitations		(697	)		(432	)		(481	)
Balance as of December 31	$	9,410		$	5,723		$	4,989

The above reconciliation of the gross unrecognized tax benefit will differ from the amount which would affect the effective tax rate because of the recognition of the federal and state tax benefits.

The Company classifies all interest and penalties as income tax expense. The Company has recorded $634, $690 and $864 in liabilities for tax related interest and penalties in 2011, 2010, and 2009, respectively.

The Company estimates it will recognize $1,768 of unrecognized tax benefits within the next twelve months due to lapses on the statute of limitation.

The Company includes its direct and indirect subsidiaries in its U.S. consolidated federal income tax return. The Company's tax sharing allocation agreement provides that any subsidiary having taxable income will pay a tax liability equivalent to what that subsidiary would have paid if it filed a separate income tax return. If the separately calculated federal income tax provision for any subsidiary results in a tax loss, the current benefit resulting from such loss, to the extent utilizable on a separate return basis, is accrued and paid to that subsidiary.