10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)*

x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

for the quarterly period ended June 30, 2011

or

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

for the transition period from                     to                     

0-10200

(Commission File Number)

SEI INVESTMENTS COMPANY

(Exact name of registrant as specified in its charter)

Pennsylvania	23-1707341
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification Number)

1 Freedom Valley Drive, Oaks, Pennsylvania 19456-1100

(Address of principal executive offices)(Zip Code)

(610) 676-1000

(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

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 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 Exchange Act).    Yes  ¨    No  x 

The number of shares outstanding of the registrant’s common stock as of July 31, 2011 was 182,579,428.

PART I. FINANCIAL INFORMATION

Item 1. Consolidated Financial Statements.

SEI Investments Company

Consolidated Balance Sheets

(unaudited)

(In thousands)

	June 30, 2011		December 31, 2010
Assets
Current Assets:
Cash and cash equivalents	$	442,311	$	496,292
Restricted cash		4,000		4,000
Receivables from regulated investment companies		31,235		29,282
Receivables, net of allowance for doubtful accounts of $868 and $1,195 (Note 4)		149,425		136,490
Deferred income taxes		651		1,387
Securities owned (Note 6)		21,032		0
Other current assets		16,479		16,268
Total Current Assets		665,133		683,719
Property and Equipment, net of accumulated depreciation and amortization of $177,779 and $166,816 (Note 4)		136,543		140,568
Capitalized Software, net of accumulated amortization of $103,479 and $90,947		302,337		294,332
Investments Available for Sale (Note 6)		74,296		74,770
Trading Securities (Note 6)		64,183		104,594
Investment in Unconsolidated Affiliate (Note 2)		72,439		64,409
Other Assets, net		15,874		14,831
Total Assets	$	1,330,805	$	1,377,223

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

Page 1 of 43

SEI Investments Company

Consolidated Balance Sheets

(unaudited)

(In thousands, except par value)

	June 30, 2011		December 31, 2010
Liabilities and Shareholders’ Equity
Current Liabilities:
Accounts payable	$	2,855	$	4,582
Accrued liabilities (Note 4)		101,335		121,410
Deferred revenue		361		1,608
Total Current Liabilities		104,551		127,600
Long-term Debt (Note 7)		40,000		95,000
Deferred Income Taxes		91,643		92,253
Other Long-term Liabilities (Note 11)		7,549		5,645
Total Liabilities		243,743		320,498
Commitments and Contingencies (Note 12)
Equity:
SEI Investments Company shareholders’ equity:
Common stock, $.01 par value, 750,000 shares authorized; 183,175 and 186,141 shares issued and outstanding		1,832		1,861
Capital in excess of par value		585,619		565,393
Retained earnings		475,667		471,159
Accumulated other comprehensive income, net		7,042		3,157
Total SEI Investments Company shareholders’ equity		1,070,160		1,041,570
Noncontrolling interest		16,902		15,155
Total Equity		1,087,062		1,056,725
Total Liabilities and Equity	$	1,330,805	$	1,377,223

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

Page 2 of 43

SEI Investments Company

Consolidated Statements of Operations

(unaudited)

(In thousands, except per share data)

	Three Months
	Ended June 30,
	2011			2010
Revenues:
Asset management, administration and distribution fees	$	172,331		$	154,774
Information processing and software servicing fees		56,035			61,296
Transaction-based and trade execution fees		9,394			12,318
Total revenues		237,760			228,388
Expenses:
Subadvisory, distribution and other asset management costs		26,304			24,600
Software royalties and other information processing costs		7,188			6,374
Brokerage commissions		6,599			8,666
Compensation, benefits and other personnel		72,613			67,012
Stock-based compensation		3,810			6,278
Consulting, outsourcing and professional fees		29,398			22,702
Data processing and computer related		11,610			10,417
Facilities, supplies and other costs		14,098			13,586
Amortization		6,792			5,997
Depreciation		5,391			5,584
Total expenses		183,803			171,216
Income from operations		53,957			57,172
Net (loss) gain from investments		(1,948	)		3,594
Interest and dividend income		1,436			1,502
Interest expense		(155	)		(415	)
Other income		0			1,070
Equity in earnings of unconsolidated affiliate		29,530			23,519
Net income before income taxes		82,820			86,442
Income taxes		28,707			32,603
Net income		54,113			53,839
Less: Net income attributable to the noncontrolling interest		(510	)		(361	)
Net income attributable to SEI Investments Company	$	53,603		$	53,478
Basic earnings per common share	$	.29		$	.28
Diluted earnings per common share	$	.29		$	.28
Dividends declared per common share	$	.12		$	.10

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

Page 3 of 43

SEI Investments Company

Consolidated Statements of Operations

(unaudited)

(In thousands, except per share data)

	Six Months
	Ended June 30,
	2011			2010
Revenues:
Asset management, administration and distribution fees	$	339,835		$	307,712
Information processing and software servicing fees		111,859			119,922
Transaction-based and trade execution fees		18,559			22,289
Total revenues		470,253			449,923
Expenses:
Subadvisory, distribution and other asset management costs		52,600			50,183
Software royalties and other information processing costs		14,205			12,448
Brokerage commissions		13,180			16,091
Compensation, benefits and other personnel		143,638			134,228
Stock-based compensation		7,542			12,935
Consulting, outsourcing and professional fees		55,396			43,409
Data processing and computer related		22,913			20,345
Facilities, supplies and other costs		28,200			27,080
Amortization		13,023			11,897
Depreciation		11,002			10,790
Total expenses		361,699			339,406
Income from operations		108,554			110,517
Net gain from investments		5,330			21,073
Interest and dividend income		2,980			3,202
Interest expense		(359	)		(886	)
Other income		0			1,070
Equity in earnings of unconsolidated affiliate		58,479			47,593
Net income before income taxes		174,984			182,569
Income taxes		62,831			68,872
Net income		112,153			113,697
Less: Net income attributable to the noncontrolling interest		(822	)		(799	)
Net income attributable to SEI Investments Company	$	111,331		$	112,898
Basic earnings per common share	$	.60		$	.60
Diluted earnings per common share	$	.59		$	.59
Dividends declared per common share	$	.12		$	.10

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

Page 4 of 43

SEI Investments Company

Consolidated Statements of Comprehensive Income

(unaudited)

(In thousands)

	Three Months Ended June 30,
			2011				2010
Net income			$	54,113			$	53,839
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments				1,467				(5,071	)
Unrealized holding gain on investments:
Unrealized holding gains during the period, net of income tax expense of $348 and $304		816				690
Less: reclassification adjustment for (gains) losses realized in net income, net of income tax (expense) benefit of $(15) and $2		28		788		4		694
Total other comprehensive income (loss), net of tax				2,255				(4,377	)
Comprehensive income			$	56,368			$	49,462
Comprehensive (income) loss attributable to noncontrolling interest				(1,015	)			926
Comprehensive income attributable to SEI Investments Company			$	55,353			$	50,388

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

Page 5 of 43

SEI Investments Company

Consolidated Statements of Comprehensive Income

(unaudited)

(In thousands)

	Six Months Ended June 30,
				2011				2010
Net income				$	112,153			$	113,697
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments					4,295				(4,294	)
Unrealized holding gain on investments:
Unrealized holding gains during the period, net of income tax expense of $236 and $649		646					690
Less: reclassification adjustment for (gains) losses realized in net income, net of income tax (expense) benefit of $(75) and $17		(131	)		515		31		721
Total other comprehensive income (loss), net of tax					4,810				(3,573	)
Comprehensive income				$	116,963			$	110,124
Comprehensive income attributable to noncontrolling interest					(1,747	)			(5	)
Comprehensive income attributable to SEI Investments Company				$	115,216			$	110,119

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

Page 6 of 43

SEI Investments Company

Consolidated Statements of Cash Flows

(unaudited)

(In thousands)

	Six Months
	Ended June 30,
	2011			2010
Cash flows from operating activities:
Net income	$	112,153		$	113,697
Adjustments to reconcile net income to net cash provided by operating activities		(19,313	)		(55,110	)
Net cash provided by operating activities		92,840			58,587
Cash flows from investing activities:
Additions to restricted cash		0			(430	)
Additions to property and equipment		(6,973	)		(7,201	)
Additions to capitalized software		(20,537	)		(17,578	)
Purchase of marketable securities		(36,596	)		(24,769	)
Prepayments and maturities of marketable securities		23,134			28,297
Sale of marketable securities		37,408			23,069
Sale of other investments		4,905			0
LSV and LSV Employee Group cash balances, net (A)		0			(37,083	)
Net cash provided by (used in) investing activities		1,341			(35,695	)
Cash flows from financing activities:
Payments on long-term debt		(55,000	)		(83,000	)
Purchase and retirement of common stock		(94,137	)		(47,643	)
Proceeds from issuance of common stock		20,845			13,821
Tax benefit on stock options exercised		2,171			993
Payment of dividends		(22,041	)		(36,011	)
Net cash used in financing activities		(148,162	)		(151,840	)
Net decrease in cash and cash equivalents		(53,981	)		(128,948	)
Cash and cash equivalents, beginning of period		496,292			590,877
Cash and cash equivalents, end of period	$	442,311		$	461,929

(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.

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

Page 7 of 43

Notes to Consolidated Financial Statements

(all figures are in thousands except per share data)

Note 1. Summary of Significant Accounting Policies

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, fund processing, and investment management business outsourcing 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 utilize the Company’s proprietary software systems to track investment activities in multiple types of investment accounts, including personal trust, corporate trust, institutional trust, and non-trust investment accounts, thereby allowing banks and trust companies to outsource trust and investment related activities. 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.

The fund processing solution offers a full range of administration and distribution support services to mutual funds, collective trust funds, single-manager hedge funds, funds of hedge funds, private equity funds and other types of investment funds. Administrative services include fund accounting, trustee and custodial support, legal support, transfer agency and shareholder servicing. Distribution support services range from market and industry insight and analysis to identifying distribution opportunities. Revenues from fund processing solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

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.

Basis of Presentation

The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K has been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of June 30, 2011, the results of operations for the three and six months ended June 30, 2011 and 2010, and cash flows for the six month periods ended June 30, 2011 and 2010. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010.

There have been no significant changes in significant accounting policies during the six months ended June 30, 2011 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010.

Cash and Cash Equivalents

Cash and cash equivalents includes $302,202 and $383,946 at June 30, 2011 and December 31, 2010, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds.

Restricted Cash

Restricted cash includes $3,000 at June 30, 2011 and December 31, 2010 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $1,000 at June 30, 2011 and December 31, 2010 segregated in special reserve accounts for the benefit of customers of the Company’s broker-dealer subsidiary, SEI Investments Distribution Co. (SIDCO), in accordance with certain rules established by the Securities and Exchange Commission for broker-dealers.

Page 8 of 43

Capitalized Software

The Company capitalized $20,537 and $17,578 of software development costs during the six months ended June 30, 2011 and 2010, respectively. As of June 30, 2011, capitalized software placed into service included on the accompanying Consolidated Balance Sheet had a weighted average remaining life of approximately 11.0 years. Amortization expense related to capitalized software was $12,532 and $11,400 during the six months ended June 30, 2011 and 2010, respectively.

Software development costs capitalized during the six months ended June 30, 2011 and 2010 relates to the continued development of the Global Wealth Platform (GWP). As of June 30, 2011, the net book value of GWP was $289,023 (net of accumulated amortization of $74,400), including $12,161 of capitalized software development costs in-progress associated with future releases. GWP has an estimated useful life of 15 years and a weighted average remaining life of 11.0 years. Amortization expense for GWP was $12,249 and $11,117 during the six months ended June 30, 2011 and 2010, respectively.

Earnings per Share

The calculations of basic and diluted earnings per share for the three months ended June 30, 2011 and 2010 are:

	For the Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	53,603		184,585	$	.29
Dilutive effect of stock options		0		2,435
Diluted earnings per common share	$	53,603		187,020	$	.29

	For the Three Months Ended June 30, 2010
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	53,478		189,356	$	.28
Dilutive effect of stock options		0		2,144
Diluted earnings per common share	$	53,478		191,500	$	.28

Employee stock options to purchase 7,675,000 and 10,422,000 shares of common stock, with an average exercise price of $28.25 and $24.87, were outstanding during the three months ended June 30, 2011 and 2010, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

The calculations of basic and diluted earnings per share for the six months ended June 30, 2011 and 2010 are:

	For the Six Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	111,331		185,186	$	.60
Dilutive effect of stock options		0		2,571
Diluted earnings per common share	$	111,331		187,757	$	.59

Page 9 of 43

	For the Six Months Ended June 30, 2010
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	112,898		189,652	$	.60
Dilutive effect of stock options		0		1,629
Diluted earnings per common share	$	112,898		191,281	$	.59

Employee stock options to purchase 7,606,000 and 16,210,000 shares of common stock, with an average exercise price of $28.26 and $23.46, were outstanding during the six months ended June 30, 2011 and 2010, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

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 is currently evaluating the requirements of the guidance and has not yet determined its impact on the Company’s 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 adoption of this guidance may impact the presentation of the Company’s consolidated financial statements, but it will not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income. The guidance is effective for interim and annual periods beginning after December 15, 2011 and will require retrospective application for all periods presented.

Page 10 of 43

Statements of Cash Flows

For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the six months ended June 30:

	2011			2010
Net income	$	112,153		$	113,697
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		11,002			10,790
Amortization		13,023			11,897
Equity in earnings of unconsolidated affiliate		(58,479	)		(47,593	)
Distributions received from unconsolidated affiliate		50,760			23,117
Stock-based compensation		7,542			12,935
Provision for losses on receivables		(327	)		(893	)
Deferred income tax expense		(36	)		635
Net realized gains from investments		(5,330	)		(21,073	)
Change in other long-term liabilities		1,904			26
Change in other assets		(1,658	)		(457	)
Other		3,858			(3,493	)
Change in current asset and liabilities
Decrease (increase) in
Receivables from regulated investment companies		(1,953	)		(1,503	)
Receivables		(15,353	)		(14,324	)
Other current assets		(211	)		308
Increase (decrease) in
Accounts payable		(1,727	)		(1,774	)
Accrued liabilities		(21,081	)		(22,999	)
Deferred revenue		(1,247	)		(709	)
Total adjustments		(19,313	)		(55,110	)
Net cash provided by operating activities	$	92,840		$	58,587

As previously disclosed in the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010, during the three months ended September 30, 2010, the Company identified that it had incorrectly classified certain accounts payable related to the purchase of computer software during the three months ended June 30, 2010 as Additions to property and equipment in the Cash flows from investing activities section on the consolidated statement of cash flows in the six months ended June 30, 2010. The effect of the misclassification resulted in Cash flows provided by operating activities and Cash flows used in investing activities being overstated by $7,102 for the six months ended June 30, 2010. The Company has revised its consolidated statement of cash flows for the six months ended June 30, 2010 to appropriately classify this amount to the Cash flows from operating activities. This misclassification had no effect on the consolidated balances sheets, consolidated statements of operations or consolidated statements of comprehensive income.

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 the general partnership LSV Asset Management (LSV). LSV is a 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 small number of SEI-sponsored mutual funds. Currently, the Company’s total partnership interest in LSV is approximately 41 percent. The Company accounts for its interest in LSV using the equity method. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.

At June 30, 2011, the Company’s total investment in LSV was $72,439. The investment in LSV exceeded the underlying equity in the net assets of LSV by $3,936, 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 $50,760 and $44,359 in the six months ended June 30, 2011 and 2010, respectively. The partnership distribution payment of $21,242 received in the three months ended March 31, 2010 is reflected in LSV and LSV Employee Group cash balances, net on the accompanying Consolidated Statement of Cash Flows.

Page 11 of 43

The Company’s proportionate share in the earnings of LSV was $29,530 and $23,519 during the three months ended June 30, 2011 and 2010, respectively. During the six months ended June 30, 2011 and 2010, the Company’s proportionate share in the earnings of LSV was $58,479 and $47,593, respectively.

The following table contains the condensed statements of operations of LSV for the three months ended June 30, 2011 and 2010:

	Three Months Ended June 30,
	2011		2010
Revenues	$	81,748	$	65,011
Net income		72,018		56,641

The following table contains the condensed statements of operations of LSV for the six months ended June 30, 2011 and 2010:

	Six Months Ended June 30,
	2011		2010
Revenues	$	161,150	$	131,020
Net income		141,964		114,613

Guaranty Agreements

In 2006, LSV Employee Group purchased an eight percent interest in LSV from two existing partners. 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 Company agreed to provide a Guaranty Agreement to the lenders of all obligations of LSV Employee Group under the Credit Agreement. 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 remain in full force and effect with respect to the amended Credit Agreement. The principal amount and interest of the term loan are paid in quarterly installments. LSV Employee Group made principal payments of $8,793 thus far during 2011. As of July 31, 2011, the remaining unpaid principal balance of the term loan was $1,298.

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 a principal payment of $183 during July 2011. As of July 31, 2011, the remaining unpaid principal balance of the term loan was $3,472.

The Company’s direct interest in LSV is 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.

As of July 31, 2011, the Company, in its capacity as guarantor, currently has no obligation of payment relating to the term loans of LSV Employee Group or LSV Employee Group II and, furthermore, fully expects that LSV Employee Group and LSV Employee Group II will meet all of their future obligations regarding their respective term loans.

Page 12 of 43

Note 3. Variable Interest Entities

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 and net capital gains 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. Some of the Company’s investment products have been determined to be VIEs at inception.

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 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, is not 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 not significant. 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 not significant to the total assets of the Company.

Note 4. Composition of Certain Financial Statement Captions

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2011			December 31, 2010
Trade receivables	$	41,419		$	34,528
Fees earned, not billed		101,355			93,506
Other receivables		7,519			9,651
		150,293			137,685
Less: Allowance for doubtful accounts		(868	)		(1,195	)
	$	149,425		$	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.

Page 13 of 43

Property and Equipment

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

	June 30, 2011			December 31, 2010
Buildings	$	136,411		$	135,935
Equipment		67,266			63,902
Land		9,890			9,890
Purchased software		77,178			74,720
Furniture and fixtures		18,691			18,566
Leasehold improvements		4,700			4,250
Construction in progress		186			121
		314,322			307,384
Less: Accumulated depreciation and amortization		(177,779	)		(166,816	)
Property and Equipment, net	$	136,543		$	140,568

The Company recognized $11,002 and $10,790 in depreciation expense related to property and equipment for the six months ended June 30, 2011 and 2010, respectively.

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2011		December 31, 2010
Accrued employee compensation	$	26,547	$	43,747
Accrued employee benefits and other personnel		5,651		6,988
Accrued consulting, outsourcing and professional fees		20,576		16,390
Accrued brokerage fees		9,571		11,942
Accrued sub-advisory, distribution and other asset management fees		15,769		16,778
Accrued income taxes		0		2,077
Other accrued liabilities		23,221		23,488
Total accrued liabilities	$	101,335	$	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 structured investment vehicles (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 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. Level 3 financial assets consist of senior note obligations issued by SIVs. The Company did not have any Level 3 financial liabilities at June 30, 2011 or December 31, 2010. There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30, 2011.

Valuation of SIV Securities

The underlying collateral of the SIV securities is mainly comprised of asset-backed securities and collateralized debt obligations. The Company utilizes the services of a third party independent firm to assist in determining the fair value of the SIV security owned. Given the lack of any reliable market data on the SIV security, the firm utilized a valuation model that employs a net asset approach which considers the value of the underlying collateral of the SIV security to determine its fair value. Management evaluates the value received from the firm and considers other information, such as the existence of any current market activity, to determine the fair value of the SIV securities.

Page 14 of 43

The model used by the independent valuation firm to determine the fair value of the SIV security attempts to value the underlying collateral of the SIV security 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 and recent market developments. Each security that makes up the underlying collateral is specifically identified by its CUSIP or ISIN number and 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. Other factors may be considered that are specific to the SIV security that may affect the fair value of the SIV security.

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 model of the independent firm giving consideration to other market factors and risk premiums. Given the lack of any significant trading activity for the SIV security owned by the Company, management believes that market prices may not represent the implied fair value of the SIV security owned by the Company.

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 June 30, 2011
	Fair Value Measurements at Reporting Date Using
	Total		Active Markets for  Identical Assets (Level 1)		Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	9,526	$	9,526	$	0	$	0
Fixed income available-for-sale securities		64,770		0		64,770		0
Fixed income securities owned		21,032		0		21,032		0
Trading securities issued by SIVs		60,053		0		0		60,053
Other trading securities		4,130		4,130		0		0
	$	159,511	$	13,656	$	85,802	$	60,053

Page 15 of 43

	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 issued by SIVs		100,645		0		0		100,645
Other trading securities		3,949		3,949		0		0
	$	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, 2011 to June 30, 2011:

	Trading Securities Issued by SIVs
Balance, January 1, 2011	$	100,645
Purchases		0
Issuances		0
Principal prepayments and settlements		(10,806	)
Sales		(34,706	)
Total gains or (losses) (realized/unrealized):
Included in earnings		4,920
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance June 30, 2011	$	60,053

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 June 30, 2010:

	Trading Securities Issued by SIVs
Balance, January 1, 2010	$	120,714
Purchases		536
Issuances		0
Principal prepayments and settlements		(23,755	)
Sales		(16,416	)
Total gains or (losses) (realized/unrealized):
Included in earnings		21,262
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance June 30, 2010	$	102,341

Page 16 of 43

Note 6. Marketable Securities

Investments Available for Sale

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

	As of June 30, 2011
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	8,971	$	244	$	(8	)	$	9,207
Other mutual funds		277		42		0			319
Debt securities		62,249		2,521		0			64,770
	$	71,497	$	2,807	$	(8	)	$	74,296
	As of December 31, 2010
	Cost Amount		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 at June 30, 2011 and December 31, 2010 were $1,854 (net of income tax expense of $945) and $1,339 (net of income tax expense of $784), respectively. These net unrealized gains are reported as a separate component of Accumulated other comprehensive income on the accompanying Consolidated Balance Sheets.

Gross realized gains and losses from available-for-sale securities during the six months ended June 30, 2011 and 2010 were minimal. Gains and losses from available-for-sale securities are reflected in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations.

The Company’s debt securities classified as available-for-sale securities are issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased to satisfy applicable regulatory requirements of SEI Private Trust Company (SPTC) and have maturity dates which range from 2020 to 2040.

Trading Securities

Trading securities of the Company consist of:

	As of June 30, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SIV securities	$	153,477	$	0	$	(93,424	)	$	60,053
LSV-sponsored mutual funds		2,049		2,081		0			4,130
	$	155,526	$	2,081	$	(93,424	)	$	64,183

Page 17 of 43

	As of 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 (loss) gain from investments on the accompanying Consolidated Statements of Operations.

Through June 30, 2011, the Company recognized $139,915 in cumulative losses from SIV securities and SIV-related issues. During the six months ended June 30, 2011 and 2010, the Company recognized net gains from SIV securities of $4,920 and $21,262, respectively. Of the net gains recognized during the six months ended June 30, 2011, gains of $6,232 resulted from cash payments received from the SIV securities and losses of $1,312 resulted from a decrease in fair value at June 30, 2011. Of the gains recognized during the six months ended June 30, 2010, $14,446 resulted from cash payments received from the SIV securities and $6,433 was from an increase in fair value at June 30, 2010. The net gains from the SIV securities are reflected in Net (loss) gain 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 in 2011 as the fair value of the Stanfield Victoria note at December 31, 2010 was not different than the sale price received.

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 and Australian companies as well as various other global securities. The underlying securities held by the funds are translated into U.S. dollars within the funds. The net gains (losses) from the change in fair value of the funds during the three and six months ended June 30, 2011 and 2010 were minimal.

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 $21,032 at June 30, 2011. The changes in fair value recognized in the three and six months ended June 30, 2011 were minimal.

Note 7. Lines of Credit

The Company has a five-year $300,000 Credit Agreement (the Credit Facility) which expires in July 2012, at which time any aggregate principal amount of loans outstanding becomes payable in full. Any borrowings made under the Credit Facility will accrue interest at 0.450 percent above the London Interbank Offer Rate (“LIBOR”). There is also a commitment fee equal to 0.09 percent per annum on the daily unused portion of the facility. The aggregate amount of the Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The Credit Facility, as amended, 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 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 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 Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the Credit Facility may be terminated. As of June 30, 2011, the Company’s ability to borrow from the Credit Facility is not limited by any covenant of the agreement.

Page 18 of 43

The Company made principal payments of $55,000 during the six months ended June 30, 2011. As of June 30, 2011, the outstanding balance of the Credit Facility was $40,000 and is included in Long-term debt on the accompanying Consolidated Balance Sheet. The Company was in compliance with all covenants of the Credit Facility at June 30, 2011.

The Company considers the book value of long-term debt related to the borrowings through the Credit Facility to be representative of its fair value.

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 the three months ended June 30, 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. All outstanding stock options have performance-based vesting provisions specific to each option grant that tie the vesting of the applicable stock options to the Company’s financial performance. The Company’s stock options vest at a rate of 50 percent when specified diluted earnings per share targets are achieved, and the remaining 50 percent when secondary, higher specified diluted earnings per share targets are achieved. The amount of stock-based compensation expense is based upon management’s estimate of when the earnings per share targets may be achieved.

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.

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended June 30, 2011 and 2010, respectively, as follows:

	Three Months Ended June 30,
	2011			2010
Stock-based compensation expense		3,810		$	6,278
Less: Deferred tax benefit		(1,427	)		(2,367	)
Stock-based compensation expense, net of tax	$	2,383		$	3,911

Page 19 of 43

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the six months ended June 30, 2011 and 2010, respectively, as follows:

	Six Months Ended June 30,
	2011			2010
Stock-based compensation expense	$	7,542		$	12,935
Less: Deferred tax benefit		(2,825	)		(4,880	)
Stock-based compensation expense, net of tax	$	4,717		$	8,055

As of June 30, 2011, there was approximately $44,986 of unrecognized compensation cost remaining, adjusted for estimated forfeitures, related to unvested employee stock options that management expects will vest and is being amortized. The Company estimates that compensation cost will be recognized according to the following schedule:

Period	Stock-Based Compensation Expense
Remainder of 2011	$	7,410
2012		14,456
2013		12,605
2014		5,543
2015		3,279
2016		1,693
	$	44,986

During the six months ended June 30, 2010, the Company revised its previous estimate made as of December 31, 2009 of when certain vesting targets are expected to be achieved. This change in management’s estimate resulted in a decrease of $2,492 in stock-based compensation expense in the six months ended June 30, 2010. There was no change in management’s estimate for the achievement of vesting targets during the six months ended June 30, 2011.

The Company issues new common shares associated with the exercise of stock options. The total intrinsic value of options exercised during the six months ended June 30, 2011 and 2010 was $8,205 and $4,921, respectively. The total options exercisable as of June 30, 2011 had an intrinsic value of $63,155. The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of June 30, 2011 and the exercise price of the shares. The market value of the Company’s common stock as of June 30, 2011 was $22.51 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of June 30, 2011 was $17.66. Total options that were outstanding as of June 30, 2011 was 26,349,000.

Common Stock Buyback

The Company’s Board of Directors has authorized the repurchase of the Company’s common stock on the open market or through private transactions. The Company purchased 4,215,000 shares at a total cost of $95,144 during the six months ended June 30, 2011. As of June 30, 2011, the Company has $112,298 of authorization remaining for the purchase of our common stock under the program.

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.

Page 20 of 43

Cash Dividend

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. Cash dividends declared during the six months ended June 30, 2011 and 2010 were $22,041 and $18,890, respectively.

Noncontrolling Interest

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2011 to June 30, 2011:

	Noncontrolling interest
Balance, January 1, 2011	$	15,155
Net income attributable to noncontrolling interest		822
Foreign currency translation adjustments		925
Balance, June 30, 2011	$	16,902

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2010 to June 30, 2010:

	Noncontrolling interest
Balance, January 1, 2010	$	121,895
Net income attributable to noncontrolling interest		799
Foreign currency translation adjustments		(794	)
Deconsolidation of LSV		(65,522	)
Deconsolidation of LSV Employee Group		(43,536	)
Balance, June 30, 2010	$	12,842

Note 9. Accumulated Comprehensive Income (Loss)

Accumulated other comprehensive income (loss), net of tax, consists of:

	Foreign Currency Translation Adjustments		Unrealized Holding  Gains (Losses) on Investments		Accumulated Other Comprehensive Income (Loss)
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

Page 21 of 43

Total comprehensive income for the six months ended June 30, 2011	$	4,295		$	515	$	4,810
Less: Total comprehensive income attributable to noncontrolling interest for the six months ended June 30, 2011		(925	)		0		(925	)
Total comprehensive income attributable to SEI Investments Company for the six months ended June 30, 2011	$	3,370		$	515	$	3,885
Total accumulated comprehensive income at June 30, 2011	$	5,447		$	1,854	$	7,301
Less: Total accumulated comprehensive income attributable to noncontrolling interest at June 30, 2011		(259	)		0		(259	)
Total accumulated comprehensive income attributable to SEI Investments Company at June 30, 2011	$	5,188		$	1,854	$	7,042

Note 10. 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 processing, fund processing, and operational 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^®.

The information in the following tables is derived from the Company’s internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three and six months ended June 30, 2011 and 2010. Management evaluates Company assets on a consolidated basis during interim periods. The accounting policies of the reportable business segments are the same as those described in Note 1 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010.

Page 22 of 43

The following tables highlight certain unaudited financial information about each of the Company’s business segments for the three months ended June 30, 2011 and 2010.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2011
Revenues	$	87,873		$	49,768		$	54,731		$	44,452		$	936		$	237,760
Expenses		86,274			27,734			27,406			29,282			2,920			173,616
Operating profit (loss)	$	1,599		$	22,034		$	27,325		$	15,170		$	(1,984	)	$	64,144
Operating margin		2	%		44	%		50	%		34	%		N/A			27	%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2010
Revenues	$	90,091		$	46,398		$	51,446		$	39,440		$	1,013		$	228,388
Expenses		78,612			28,120			26,576			25,596			2,739			161,643
Operating profit (loss)	$	11,479		$	18,278		$	24,870		$	13,844		$	(1,726	)	$	66,745
Operating margin		13	%		39	%		48	%		35	%		N/A			29	%

A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the quarters ended June 30, 2011 and 2010 is as follows:

	2011			2010
Total operating profit from segments above	$	64,144		$	66,745
Corporate overhead expenses		(10,720	)		(9,941	)
Noncontrolling interest reflected in segments		533			368
Income from operations	$	53,957		$	57,172

The following tables provide additional information for the three months ended June 30, 2011 and 2010 pertaining to our business segments:

	Capital Expenditures					Depreciation
	2011			2010		2011		2010
Private Banks	$	6,783		$	7,559	$	3,962	$	4,044
Investment Advisors		2,296			2,673		556		592
Institutional Investors		251			555		268		291
Investment Managers		89			752		435		473
Investments in New Businesses		92			135		29		36
Total from business segments	$	9,511		$	11,674	$	5,250	$	5,436
Corporate Overhead		(24	)		157		141		148
	$	9,487		$	11,831	$	5,391	$	5,584

Page 23 of 43

	Amortization
	2011		2010
Private Banks	$	4,608	$	3,765
Investment Advisors		1,551		1,364
Institutional Investors		196		301
Investment Managers		131		206
Investments in New Businesses		65		118
Total from business segments	$	6,551	$	5,754
Corporate Overhead		241		243
	$	6,792	$	5,997

The following tables highlight certain unaudited financial information about each of the Company’s business segments for the six months ended June 30, 2011 and 2010.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2011
Revenues	$	174,582		$	97,876		$	107,916		$	87,893		$	1,986		$	470,253
Expenses		168,677			54,774			54,359			57,281			6,045			341,136
Operating profit (loss)	$	5,905		$	43,102		$	53,557		$	30,612		$	(4,059	)	$	129,117
Operating margin		3	%		44	%		50	%		35	%		N/A			27	%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2010
Revenues	$	177,212		$	91,861		$	101,785		$	77,050		$	2,015		$	449,923
Expenses		156,211			55,703			52,956			50,155			5,400			320,425
Operating profit (loss)	$	21,001		$	36,158		$	48,829		$	26,895		$	(3,385	)	$	129,498
Operating margin		12	%		39	%		48	%		35	%		N/A			29	%

A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the six months ended June 30, 2011 and 2010 is as follows:

	2011			2010
Total operating profit from segments above	$	129,117		$	129,498
Corporate overhead expenses		(21,368	)		(19,658	)
Noncontrolling interest reflected in segments		805			677
Income from operations	$	108,554		$	110,517

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The following tables provide additional information for the six months ended June 30, 2011 and 2010 pertaining to our business segments:

	Capital Expenditures				Depreciation
	2011		2010		2011		2010
Private Banks	$	17,813	$	15,436	$	8,000	$	7,752
Investment Advisors		6,038		5,498		1,147		1,156
Institutional Investors		1,132		1,257		560		567
Investment Managers		1,873		1,871		938		943
Investments in New Businesses		304		291		59		73
Total from business segments	$	27,160	$	24,353	$	10,704	$	10,491
Corporate Overhead		350		426		298		299
	$	27,510	$	24,779	$	11,002	$	10,790

	Amortization
	2011		2010
Private Banks	$	8,837	$	7,466
Investment Advisors		2,969		2,704
Institutional Investors		363		605
Investment Managers		246		411
Investments in New Businesses		124		225
Total from business segments	$	12,539	$	11,411
Corporate Overhead		484		486
	$	13,023	$	11,897

Note 11. Income Taxes

The gross liability for unrecognized tax benefits at June 30, 2011 and December 31, 2010 was $7,401 and $5,723, respectively, exclusive of interest and penalties, of which $6,350 and $4,870 would affect the effective tax rate if the Company were to recognize the tax benefit.

The Company classifies interest and penalties on unrecognized tax benefits as income tax expense. As of June 30, 2011 and December 31, 2010, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $702 and $689, respectively.

	June 30, 2011		December 31, 2010
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	7,401	$	5,723
Interest and penalties on unrecognized benefits		702		689
Total gross uncertain tax positions	$	8,103	$	6,412
Amount included in Current liabilities	$	554	$	767
Amount included in Other long-term liabilities		7,549		5,645
	$	8,103	$	6,412

The Company’s effective tax rates were 34.7 percent and 37.8 percent for the three months ended June 30, 2011 and 2010, respectively. For the six months ended June 30, 2011 and 2010, the Company’s tax rates were 36.0 percent and 37.8 percent, respectively. In December 2010, the research and development tax credit was reinstated for calendar year 2010 and 2011. The 2011 tax rate reflects a benefit for research and development tax credit whereas the 2010 tax rate did not reflect any benefit. Additionally, during the three months ended June 30, 2011, management determined the Company was eligible for the Domestic Production Activities Deduction. The effective rate in the three months ended June 30, 2011 reflects the benefit of this deduction for both 2011 and 2010.

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The Company files income tax returns in the United States on a consolidated basis and in many U.S. state and foreign jurisdictions. The Company is subject to examination of income tax returns by the Internal Revenue Service (IRS) and other domestic and foreign tax authorities. 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.

The Company estimates it will recognize $554 of unrecognized tax benefits within the next twelve months due to the expiration of the statute of limitations and resolution of income tax audits. These unrecognized tax benefits are related to tax positions taken on certain federal, state, and foreign tax returns. However, the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. While it is reasonably possible that some issues under examination could be resolved in the next twelve months, based upon the current facts and circumstances, the Company cannot reasonably estimate the timing of such resolution or total range of potential changes as it relates to the current unrecognized tax benefits that are recorded as part of the Company’s financial statements.

Note 12. Commitments and Contingencies

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. The Court has permitted the parties to file supplemental briefing due July 13, 2011 with replies due July 20, 2011, after which the motion will be fully briefed. 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.

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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. 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 which is set for hearing on October 4-6, 2011; 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. 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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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

(In thousands, except asset balances and per share data)

This discussion reviews and analyzes the consolidated financial condition at June 30, 2011 and 2010, the consolidated results of operations for the three and six months ended June 30, 2011 and 2010 and other key factors that may affect future performance. This discussion should be read in conjunction with the Consolidated Financial Statements and the Notes to the Consolidated Financial Statements.

Overview

Consolidated Summary

We are a leading global provider of investment processing, fund processing, and investment management business outsourcing solutions that help corporations, financial institutions, financial advisors, and ultra-high-net-worth families create and manage wealth. 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. Fund processing and investment management fees are earned as a percentage of average assets under management or administration. As of June 30, 2011, through our subsidiaries and partnerships in which we have a significant interest, we manage or administer $429.8 billion in mutual fund and pooled or separately managed assets, including $180.4 billion in assets under management and $249.4 billion in client assets under administration.

Our Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2011 and 2010 were:

	Three Months Ended June 30,									Six Months Ended June 30,
	2011			2010			Percent Change			2011			2010			Percent Change
Revenues	$	237,760		$	228,388			4	%	$	470,253		$	449,923			5	%
Expenses		183,803			171,216			7	%		361,699			339,406			7	%
Income from operations		53,957			57,172			(6	%)		108,554			110,517			(2	%)
Net (loss) gain from investments		(1,948	)		3,594			N/A			5,330			21,073			(75	%)
Interest income, net of interest expense		1,281			1,087			18	%		2,621			2,316			13	%
Other income		0			1,070			N/A			0			1,070			N/A
Equity in earnings of unconsolidated affiliate		29,530			23,519			26	%		58,479			47,593			23	%
Income before income taxes		82,820			86,442			(4	%)		174,984			182,569			(4	%)
Income taxes		28,707			32,603			(12	%)		62,831			68,872			(9	%)
Net income		54,113			53,839			1	%		112,153			113,697			(1	%)
Less: Net income attributable to noncontrolling interest		(510	)		(361	)		41	%		(822	)		(799	)		3	%
Net income attributable to SEI Investments Company	$	53,603		$	53,478			0	%	$	111,331		$	112,898			(1	%)
Diluted earnings per common share	$	.29		$	.28			4	%	$	.59		$	.59			0	%

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In our opinion, the following items had a significant impact on our financial results for the three and six months ended June 30, 2011 and 2010:

• Revenue growth was primarily driven by higher Asset management, administration and distribution fees from market appreciation across all business segments. Favorable capital market conditions increased the value of assets we manage or administer for our existing clients, resulting in an increase in our base revenues across these segments. Revenue growth in asset-based fees was also driven by new client asset funding, as well as asset funding from existing clients, for our hedge fund and separately managed accounts solutions in our Investment Managers segment.

• Revenues in our Private Banks segment decreased due to lower investment processing fees from bank clients involved in mergers and acquisitions and price reductions provided to existing clients that contracted for longer periods as well as lower trade-execution fees from reduced trading volumes in the capital markets. The previously discussed increase in asset management fees as well as investment processing fees from new and existing Global Wealth Services clients implemented onto the Global Wealth Platform partially offset the decline in revenues.

• Revenues in the prior year comparable period in the Private Banks segment include $5.0 million of one-time contract termination fees recorded in the second quarter 2010 from a bank client lost as a result of an acquisition, contributing to the decline in the six months ended June 20, 2011.

• Our proportionate share in the earnings of LSV in the first six months of 2011 was $58.5 million, as compared to $47.6 million in first six months of 2010, an increase of 23 percent. LSV’s revenues increased because of market appreciation in the value of assets under management. LSV’s assets under management were $60.6 billion at June 30, 2011, as compared to $47.8 billion at June 30, 2010, an increase of 27 percent.

• We recognized losses of $1.9 million and net gains of $4.9 million from SIV securities in the three and six months ended June 30, 2011, respectively, as compared to gains of $3.9 million and $21.3 million in the prior year periods. Approximately $6.2 million of the net gain in the first six months of 2011 resulted from cash payments received from the SIV securities that had been previously written down.

• We continued to invest in the Global Wealth Platform and its operational infrastructure. A larger portion of these costs are not capitalized, which partially contributed to the increase in Consulting, outsourcing and professional fees. During the first six months of 2011, we capitalized $20.5 million for significant enhancements and new functionality for the platform, as compared to $17.6 million in the first six months of 2010. We will continue to incur significant development costs for enhancements and upgrades to the Global Wealth Platform.

• Our operating expenses related to servicing new and existing Global Wealth Services clients implemented on the Global Wealth Platform as well as new clients of our hedge fund and separately managed accounts solutions increased during the first six months of 2011. These 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.

• Stock-based compensation costs in 2011 reflect the return to normal levels of expense amortization as compared to the level in 2010 when stock-based compensation was accelerated for stock options that were expected to achieve performance vesting targets earlier than originally estimated.

• Our effective tax rate for the first six months of 2011 decreased to 36.0 percent as compared to 37.8 percent in the first six months of 2010. Our tax rate in 2011 was favorably impacted by the reinstatement of the research and development tax credit which occurred in December 2010 and tax planning strategies implemented during the second quarter 2011.

• We made principal payments of $55.0 million and $83.0 million during the first six months of 2011 and 2010, respectively, to reduce the outstanding balance of our credit facility. As of June 30, 2011, the outstanding balance of the credit facility was $40.0 million.

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• We continued our stock repurchase program during 2011 and purchased 4,215,000 shares at an average price of approximately $22.57 per share in the six month period.

Page 30 of 43

Asset Balances

This table presents assets 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.

Asset Balances
(In millions)
	As of June 30,				Percent Change
	2011		2010
Private Banks:
Equity and fixed income programs	$	16,720	$	11,769	42%
Collective trust fund programs		504		640	(21%)
Liquidity funds		4,918		5,175	(5%)
Total assets under management	$	22,142	$	17,584	26%
Client proprietary assets under administration		10,994		10,335	6%
Total assets	$	33,136	$	27,919	19%
Investment Advisors:
Equity and fixed income programs		28,410		23,699	20%
Collective trust fund programs		1,499		2,066	(27%)
Liquidity funds		1,651		2,635	(37%)
Total assets under management	$	31,560	$	28,400	11%
Institutional Investors:
Equity and fixed income programs		51,180		43,506	18%
Collective trust fund programs		482		643	(25%)
Liquidity funds		3,146		2,558	23%
Total assets under management	$	54,808	$	46,707	17%
Investment Managers:
Equity and fixed income programs		50		1	N/A
Collective trust fund programs		10,372		7,366	41%
Liquidity funds		179		428	(58%)
Total assets under management	$	10,601	$	7,795	36%
Client proprietary assets under administration		238,432		220,459	8%
Total assets	$	249,033	$	228,254	9%
Investments in New Businesses:
Equity and fixed income programs		558		496	13%
Liquidity funds		41		74	(45%)
Total assets under management	$	599	$	570	5%
LSV:
Equity and fixed income programs	$	60,626	$	47,822	27%
Consolidated:
Equity and fixed income programs		157,544		127,293	24%
Collective trust fund programs		12,857		10,715	20%
Liquidity funds		9,935		10,870	(9%)
Total assets under management	$	180,336	$	148,878	21%
Client proprietary assets under administration		249,426		230,794	8%
Total assets under management and administration	$	429,762	$	379,672	13%

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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 three and six months ended June 30, 2011 compared to the three and six months ended June 30, 2010 were as follows:

	Three Months Ended June 30,									Six Months Ended June 30,
	2011			2010			Percent Change			2011			2010			Percent Change
Private Banks:
Revenues	$	87,873		$	90,091			(2	%)	$	174,582		$	177,212			(1	%)
Expenses		86,274			78,612			10	%		168,677			156,211			8	%
Operating Profit	$	1,599		$	11,479			(86	%)	$	5,905		$	21,001			(72	%)
Operating Margin		2	%		13	%					3	%		12	%
Investment Advisors:
Revenues	$	49,768		$	46,398			7	%	$	97,876		$	91,861			7	%
Expenses		27,734			28,120			(1	%)		54,774			55,703			(2	%)
Operating Profit	$	22,034		$	18,278			21	%	$	43,102		$	36,158			19	%
Operating Margin		44	%		39	%					44	%		39	%
Institutional Investors:
Revenues	$	54,731		$	51,446			6	%	$	107,916		$	101,785			6	%
Expenses		27,406			26,576			3	%		54,359			52,956			3	%
Operating Profit	$	27,325		$	24,870			10	%	$	53,557		$	48,829			10	%
Operating Margin		50	%		48	%					50	%		48	%
Investment Managers:
Revenues	$	44,452		$	39,440			13	%	$	87,893		$	77,050			14	%
Expenses		29,282			25,596			14	%		57,281			50,155			14	%
Operating Profit	$	15,170		$	13,844			10	%	$	30,612		$	26,895			14	%
Operating Margin		34	%		35	%					35	%		35	%
Investments in New Businesses:
Revenues	$	936		$	1,013			(8	%)	$	1,986		$	2,015			(1	%)
Expenses		2,920			2,739			7	%		6,045			5,400			12	%
Operating Loss	$	(1,984	)	$	(1,726	)		N/A		$	(4,059	)	$	(3,385	)		N/A
Operating Margin		N/A			N/A						N/A			N/A

For additional information pertaining to our business segments, see Note 10 to the Consolidated Financial Statements.

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Private Banks

	Three Months Ended							Six Months Ended
	June 30, 2011		June 30, 2010		Percent Change			June 30, 2011		June 30, 2010		Percent Change
Revenues:
Investment processing and software servicing fees	$	55,587	$	60,572		(8	%)	$	111,033	$	118,498		(6	%)
Asset management, administration & distribution fees		25,311		21,462		18	%		49,229		42,318		16	%
Transaction-based and trade execution fees		6,975		8,057		(13	%)		14,320		16,396		(13	%)
Total revenues	$	87,873	$	90,091		(2	%)	$	174,582	$	177,212		(1	%)

Revenues decreased $2.2 million, or two percent, in the three month period and $2.6 million, or one percent, in the six month period ended June 30, 2011 and were primarily affected by:

• Lower recurring investment processing fees mainly due to lost clients involved in mergers and acquisitions as well as price reductions provided to existing clients that contracted for longer periods, offset partially by increased fees from new clients;

• $5.0 million in one-time contract termination fees recorded in the second quarter 2010 from a bank client lost as a result of an acquisition; and

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

• Increased investment management fees from existing international clients due to higher assets under management from improved capital markets and positive cash flows; and

• Increased net investment processing fees from new and existing Global Wealth Services clients implemented onto the Global Wealth Platform.

Operating margins decreased to 2 percent compared to 13 percent in the three month period and were 3 percent compared to 12 percent in the six month period. Operating income decreased $9.9 million, or 86 percent, in the three month period and $15.1 million, or 72 percent, in the six month period and was primarily affected by:

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

• Increased operational costs for servicing new and existing Global Wealth Services clients implemented onto the Global Wealth Platform;

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

• A decrease in revenues; partially offset by

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

• Decreased stock-based compensation costs; and

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

Investment Advisors

Revenues increased $3.4 million, or seven percent, in the three month period and $6.0 million, or seven percent, in the six month period ended June 30, 2011 and were primarily affected by:

• Increased investment management fees from existing clients due to higher 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 increased to 44 percent, as compared to 39 percent in both the three and six month periods. Operating income increased by $3.8 million, or 21 percent, in the three month period, and $6.9 million, or 19 percent, in the six month period and was primarily affected by:

• An increase in revenues; and

• Decreased stock-based compensation costs; 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.

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Institutional Investors

Revenues increased $3.3 million, or six percent, in the three month period and $6.1 million, or six percent, in the six month period ended June 30, 2011 and were primarily affected by:

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

• Annual client performance-based fees recognized in second quarter 2011; and

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

• Client losses.

Operating margins increased to 50 percent, as compared to 48 percent in both the three and six month periods. Operating income increased $2.5 million, or 10 percent, in the three month period and $4.7 million, or ten percent, in the six month period and was primarily affected by:

• An increase in revenues;

• Decreased stock-based compensation costs; and

• Decreased discretionary marketing and promotion expenses; partially offset by

• Increased direct expenses associated with higher investment management fees; and

• Increased compensation and other personnel expenses.

Investment Managers

Revenues increased $5.0 million, or 13 percent, in the three month period and $10.8 million, or 14 percent, in the six month period ended June 30, 2011 and were primarily affected by:

• Cash flows from new clients of our hedge fund and separately managed accounts solutions; and

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

• Client losses.

Operating margins decreased to 34 percent, as compared to 35 percent in the three month period and remained at 35 percent in the six month period. Operating income increased $1.3 million, or 10 percent, in the three month period and $3.7 million, or 14 percent, in the six month period and was primarily affected by:

• An increase in revenues; and

• Decreased stock-based compensation costs; partially offset by

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

Other

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Net (loss) gain from investments	$	(1,948	)	$	3,594		$	5,330		$	21,073
Interest and dividend income		1,436			1,502			2,980			3,202
Interest expense		(155	)		(415	)		(359	)		(886	)
Other income		0			1,070			0			1,070
Equity in earnings of unconsolidated affiliate		29,530			23,519			58,479			47,593
Total other income and expense items, net	$	28,863		$	29,270		$	66,430		$	72,052

Net (loss) gain from investments

Net (loss) gain from investments consists of:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011		2010
(Losses) Gains from SIV securities	$	(1,944	)	$	3,913		$	4,920	$	21,262
Net realized and unrealized gains from marketable securities		(4	)		(319	)		410		(189	)
Net (loss) gain from investments	$	(1,948	)	$	3,594		$	5,330	$	21,073

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During the six months ended June 30, 2011, we recognized net gains of $4,920 from SIV securities, of which gains of $6,232 resulted from cash payments received from the SIV securities and losses of $1,312 resulted from a decrease in fair value at June 30, 2011. In addition, we sold the senior note obligation originally issued by Stanfield Victoria. There was no gain or loss recognized 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.

During the six months ended June 30, 2010, we recognized gains of $21,262 from SIV securities, of which $14,446 resulted from cash payments received from the SIV securities and $6,433 from an increase in fair value at June 30, 2010. In addition, the Company recognized a net gain of $383 from the sales of two SIV securities during the six months ended June 30, 2010.

Interest and dividend income

Interest and dividend income is earned based upon the amount of cash that is invested daily and the average yield earned on those balances.

Interest expense

Interest expense includes the interest charges and fees related to the borrowings under our credit facility.

Equity in the earnings of unconsolidated affiliate

Equity in the earnings of unconsolidated affiliate on the accompanying Consolidated Statement of Operations includes our less than 50 percent ownership in LSV. Our proportionate share in the earnings of LSV was $29.5 million in the three months ended June 30, 2011 as compared to $23.5 million in three months ended June 30, 2010, an increase of 26 percent. Our proportionate share in the earnings of LSV was $58.5 million in the six months ended June 30, 2011 as compared to $47.6 million in the six months ended June 30, 2010, an increase of 23 percent. The increases in the three and six month periods in 2011 were due to increased assets under management from existing clients because of improved capital markets. LSV’s assets under management increased $12.8 billion to $60.6 billion at June 30, 2011 as compared to $47.8 billion at June 30, 2010, an increase of 27 percent.

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.

Income Taxes

Our effective tax rates were 34.7 percent and 37.8 percent for the three months ended June 30, 2011 and 2010, respectively. For the six months ended June 30, 2011 and 2010, our effective tax rates were 36.0 percent and 37.8 percent, respectively. Our tax rate in 2011 was favorably impacted by the reinstatement of the research and development tax credit which was written into law in December 2010. Additionally, during the three months ended June 30, 2011, we determined that SEI was eligible for the Domestic Production Activities Deduction. The effective rate in the three months ended June 30, 2011 reflects the benefit of this deduction for both 2011 and 2010. We may be able to amend prior year tax returns to obtain benefits for the Domestic Production Activities deduction which would be recognized when we make such a determination; however, any benefit is not expected to be significant.

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Stock-Based Compensation

During the six months ended June 30, 2011 and 2010, we recognized approximately $7.5 million and $12.9 million, respectively, in stock-based compensation expense, a decrease of $5.4 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	$	2,700
Stock-based compensation cost associated with options that vested at December 31, 2010		(7,788	)
Other items		(305	)
	$	5,393

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
Remainder of 2011	$	7,410
2012		14,456
2013		12,605
2014		5,543
2015		3,279
2016		1,693
	$	44,986

Fair Value Measurements

The fair value of our financial assets and liabilities is determined in accordance with the fair value hierarchy. The fair value of most of our financial assets are determined using Level 1 or Level 2 inputs and consist mainly of investments in equity or fixed-income mutual funds that are quoted daily and 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 of similar assets. Our Level 3 financial assets consist mainly of SIV securities (See Note 5 to the Notes to Consolidated Financial Statements).

Liquidity and Capital Resources

	For the Six Months Ended June 30,
	2011			2010
Net cash provided by operating activities	$	92,840		$	58,587
Net cash provided by (used in) investing activities		1,341			(35,695	)
Net cash used in financing activities		(148,162	)		(151,840	)
Net increase (decrease) in cash and cash equivalents		(53,981	)		(128,948	)
Cash and cash equivalents, beginning of period		496,292			590,877
Cash and cash equivalents, end of period	$	442,311		$	461,929

Cash requirements and liquidity needs are primarily funded through our cash flow from operations and our capacity for additional borrowing. At June 30, 2011, our unused sources of liquidity consisted of cash and cash equivalents and the amount available under our credit facility. During 2009, we borrowed $254.0 million through our five-year, $300.0 million credit facility and used the proceeds to purchase SIV securities from SEI-sponsored money market funds. Through June 30, 2011, we made principal payments of $214.0 million, including $55.0 million during 2011, to reduce the outstanding balance of our credit facility. As of June 30, 2011, the outstanding balance of the credit facility was $40.0 million. At September 30, 2011, the outstanding balance of the credit facility will be classified as short-term debt due to the expiration date of the agreement in July 2012 (See Note 7 to the Consolidated Financial Statements).

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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 July 31, 2011, the amount of cash and cash equivalents considered free and immediately accessible for other general corporate purposes was $329.9 million.

Our credit facility is an unsecured senior revolving line of credit with JPMorgan Chase Bank, N.A., individually and as agent and a syndicate of other lenders. The credit facility is scheduled to expire in July 2012. The availability of the 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. Of all of the covenants, we believe satisfying the leverage ratio could be the most difficult in the future. The leverage ratio is calculated as consolidated indebtedness divided by earnings before interest, taxes, depreciation, amortization and other items as defined by the covenant during the last four quarters (EBITDA). We must maintain a ratio of consolidated indebtedness of not more than 1.75 times the amount of EBITDA until the expiration of the agreement. As of June 30, 2011, our leverage ratio is 0.11 times EBITDA. According to the terms of the covenant, we must include the outstanding debt of LSV Employee Group in the calculation of consolidated indebtedness (See Note 2 to the Consolidated Financial Statements). We do not anticipate that this covenant or any covenant of the credit facility will restrict our ability to utilize the credit facility.

During the third quarter 2010, we identified that we incorrectly classified certain accounts payable related to the purchase of computer software during the second quarter 2010 as Additions to property and equipment in the Cash flows from investing activities section on the consolidated statement of cash flows in the six months ended June 30, 2010. The effect of the misclassification resulted in Cash flows provided by operating activities and Cash flows used in investing activities being overstated by $7.1 million for the six months ended June 30, 2010. We have revised our consolidated statement of cash flows for the six months ended June 30, 2010 to appropriately classify this amount to the Cash flows from operating activities (See Note 1 to the Consolidated Financial Statements).

Cash flows from operations increased $27.2 million in the first six months of 2011 compared to the first six months of 2010 due to the partnership distribution payment 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 $44.1 million in the first six months of 2011 compared to the first six months of 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 $36.6 million for the purchase of marketable securities in the first six months of 2011 as compared to $24.8 million in the first six months of 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 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 additional GNMA securities to satisfy applicable regulatory requirements of SPTC. We had cash inflows of $60.5 million from sales of marketable securities in the first six months of 2011 as compared to $51.4 million in the first six months of 2010. Marketable securities sold in 2011 and 2010 primarily includes 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 $20.5 million of software development costs in the first six months of 2011 as compared to $17.6 million in the first six months of 2010. Amounts capitalized in 2011 and 2010 include costs for significant enhancements and upgrades to the platform.

• Capital expenditures. Our capital expenditures in the first six months of 2011 and 2010 primarily include equipment for our data center operations. We expect to make additional purchases for the support of our data center operations during 2011.

Net cash used in financing activities includes:

• Principal payments of our debt. Principal payments in the first six months of 2011 and 2010 include payments of $55.0 million and $83.0 million, respectively, to reduce the outstanding debt associated with our credit facility.

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• The repurchase of our common stock. We spent approximately $95.1 million during the first six months of 2011 and $49.7 million during the first six months of 2010 for the repurchase of our common stock. As of July 31, 2011, we have approximately $99.3 million of authorization remaining under the program.

• Dividend payments. Cash dividends paid were $22.0 million or $.12 per share in the first six months of 2011 and 36.0 million or $.19 per share in the first six months of 2010. The decrease in dividends paid in 2011 was due to the payment date of the December 2010 dividend occurring in the calendar year as compared to the payment date of the dividends declared in December 2009 which occurred in January 2010.

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; principal payments on our debt; and future dividend payments.

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Forward-Looking Information and Risk Factors

The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements. 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 our latest Annual Report on Form 10-K in Part I, Item 1A. These risks include the following:

• changes in capital markets that may affect our revenues and earnings;

• product development risk;

• consolidation within our target markets, including consolidations between banks and other financial institutions;

• risk of failure by a third-party service provider;

• the performance of the funds we manage;

• the affect of extensive governmental regulation;

• systems and technology risks;

• data security risks;

• third party approval of our investment products with advisors affiliated with independent broker-dealers or other networks;

• operational risks associated with the processing of investment transactions;

• changes in, or interpretation of, accounting principles or tax rules and regulations;

• fluctuations in foreign currency exchange rates; and

• retention of senior management personnel.

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 is a savings association holding company regulated by the Board of Governors of the Federal Reserve System.

SIDCO and SIMC are subject to various federal and state laws and regulations and rules of self-regulatory organizations (such as FINRA) that grant supervisory agencies, including the SEC and FINRA, broad administrative powers. In the event of a failure to comply with these laws and regulations, the possible sanctions that may be imposed include the suspension of individual employees, limitations on the permissibility of SIDCO, SIMC, SEI, and our other subsidiaries to engage in business for specified periods of time, the revocation of applicable registration as a broker-dealer or investment advisor, as the case may be, censures, and fines. SPTC and STC are subject to laws and regulations imposed by federal and state banking authorities. In the event of a failure to comply with these laws and regulations, restrictions, including revocation of applicable banking charter, may be placed on the business of these companies and fines or other sanctions may be imposed. Additionally, the 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.

Compliance with existing and future regulations and responding to and complying with recent regulatory activity affecting broker-dealers, investment advisors, investment companies and their service providers and financial institutions could have a significant impact on us. We periodically undergo regulatory examinations and respond to regulatory inquiries, and document requests. Regulatory scrutiny has increased significantly over the last year or so, particularly in the case of FINRA, SEC and bank regulatory attention. As a result of these examinations, inquiries and requests, and as a result of increased civil litigation activity, we engage legal counsel, review our compliance procedures and business operations, and make changes as we deem necessary. These additional activities may result in increased expense or may reduce revenues.

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.

The Dodd-Frank Wall Street Reform and Consumer Protection Act signed into law in July 2010 makes extensive changes to the laws regulating financial services firms. Among other things, this Act abolished the Office of Thrift Supervision and transferred its functions to the other federal banking agencies. The legislation requires significant rule-making and mandates multiple studies, which could result in additional legislative or regulatory action. We are currently evaluating the impact the legislation will have on us and our subsidiaries and the products and services we provide to our clients.

Governmental scrutiny from regulators, legislative bodies and law enforcement agencies with respect to matters relating to compensation, our business practices, our past actions and other matters has increased dramatically in the past several years. Responding to these investigations 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.

Among other things, as a result of regulators enforcing existing laws and regulations, we could be fined, prohibited from engaging in some of our business activities, subject to limitations or conditions on our business activities or subjected to new or substantially higher taxes or other governmental charges in connection with the conduct of our business or with respect to our employees.

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 and state securities authorities. Existing or future regulations applicable to our clients may affect our clients’ purchase of our products and services.

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In addition, see the discussion of governmental regulations in Item 1A “Risk Factors” in our latest Annual Report on Form 10-K for a description of the risks that proposed regulatory changes may present for our business.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Information regarding our market risk exposures appears in Part II - Item 7A of our Annual Report on Form 10-K for the year ended December 31, 2010. There have been no material changes in our market risk exposures from those disclosed in our Annual Report on Form 10-K for 2010.

Item 4. Controls and Procedures.

(a) Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of the end of the period covered by this report are effective in ensuring that information required to be disclosed by us in reports filed under the Securities Exchange Act of 1934 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. A controls system, no matter how well designed and operated, cannot provide absolute assurance that the objectives of the controls systems are met, and no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within a company have been detected.

(b) Change in Internal Control over Financial Reporting

No change in our internal control over financial reporting occurred during the quarter ended June 30, 2011 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. 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. The Court has permitted the parties to file supplemental briefing due July 13, 2011 with replies due July 20, 2011, after which the motion will be fully briefed. 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. 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 which is set for hearing on October 4-6, 2011; 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. 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, we are not reasonably able to provide an estimate of loss, if any, with respect to the foregoing lawsuits.

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Item 1A. Risk Factors

Information regarding risk factors appears in Part I - Item 1A of the Company’s Annual Report on Form 10-K for the year ended December 31, 2010. There have been no material changes in our risk factors from those disclosed in our Annual Report on Form 10-K for 2010.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

(c) Our Board of Directors has authorized the repurchase of up to $1.828 billion worth 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 June 30, 2011 is as follows:

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
April 1 – 30, 2011		200,000	$	22.33		200,000	$	63,496,000
May 1 – 31, 2011		1,025,000		22.81		1,025,000		140,118,000
June 1 – 30, 2011		1,265,000		21.99		1,265,000		112,298,000
Total		2,490,000		22.35		2,490,000

Item 6. Exhibits.

The following is a list of exhibits filed as part of the Form 10-Q.

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.
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

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SIGNATURES

Pursuant to the requirements 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:	August 4, 2011	By:	/s/ Dennis J. McGonigle
			Dennis J. McGonigle
			Chief Financial Officer

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EX-31.1

Exhibit 31.1

CERTIFICATIONS

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

1. I have reviewed this quarterly report on Form 10-Q 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 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 registrant’s board of directors (or persons performing the equivalent function):

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 data 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 controls over financial reporting.

Date: August 4, 2011

/s/ Alfred P. West, Jr.

Alfred P. West, Jr.

Chairman and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Dennis J. McGonigle, certify that:

1. I have reviewed this quarterly report on Form 10-Q 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 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 registrant’s board of directors (or persons performing the equivalent function):

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

Date: August 4, 2011

/s/ Dennis J. McGonigle

Dennis J. McGonigle

Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Alfred P. West, Jr., Chairman and Chief Executive Officer, and I, 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 Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011 (the “Form 10-Q”) 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-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 4, 2011	Date: August 4, 2011
/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.

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Accumulated Comprehensive Income (Loss) (Accumulated Comprehensive Income (Loss), Net of Tax) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustments	$ 5,188		$ 5,188		$ 1,818
Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gains (Losses) on Investments	1,854		1,854		1,339
Accumulated Other Comprehensive Income (Loss)	7,042		7,042		3,157
Total Comprehensive Income, Foreign Currency Translation Adjustments	1,467	(5,071)	4,295	(4,294)
Total Comprehensive Income (loss)	2,255	(4,377)	4,810	(3,573)
Total Comprehensive Income, Foreign Currency Translation Adjustments, Attributable to SEI Investments Company			3,370
Total Comprehensive Income, Unrealized Holding Gains (Losses) on Investments, Attributable to SEI Investments Company			515
Total Comprehensive Income, Attributable to SEI Investments Company			3,885
Total Comprehensive Income (Loss), Unrealized Holding Gains (Losses) on Investments	788	694	515	721
Controlling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustments	5,447		5,447		1,152
Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gains (Losses) on Investments	1,854		1,854		1,339
Accumulated Other Comprehensive Income (Loss)	7,301		7,301		2,491
Total Comprehensive Income, Foreign Currency Translation Adjustments			4,295
Total Comprehensive Income, Unrealized Holding Gains (Losses) on Investments			515
Total Comprehensive Income (loss)			4,810
Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustments	(259)		(259)		666
Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gains (Losses) on Investments	0		0		0
Accumulated Other Comprehensive Income (Loss)	(259)		(259)		666
Total Comprehensive Income, Foreign Currency Translation Adjustments, Attributable to Noncontrolling Interest			(925)
Total Comprehensive Income, Unrealized Holding Gains (Losses) on Investments, Attributable to Noncontrolling Interest			0
Total Comprehensive Income, Attributable to Noncontrolling Interest			$ (925)

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets
Receivables, allowance for doubtful accounts	$ 868	$ 1,195
Property and Equipment, accumulated depreciation and amortization	177,779	166,816
Capitalized Software, accumulated amortization	$ 103,479	$ 90,947
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000	750,000
Common stock, shares issued	183,175	186,141
Common stock, shares outstanding	183,175	186,141

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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Asset management, administration and distribution fees	$ 172,331	$ 154,774	$ 339,835	$ 307,712
Information processing and software servicing fees	56,035	61,296	111,859	119,922
Transaction-based and trade execution fees	9,394	12,318	18,559	22,289
Total revenues	237,760	228,388	470,253	449,923
Expenses:
Subadvisory, distribution and other asset management costs	26,304	24,600	52,600	50,183
Software royalties and other information processing costs	7,188	6,374	14,205	12,448
Brokerage commissions	6,599	8,666	13,180	16,091
Compensation, benefits and other personnel	72,613	67,012	143,638	134,228
Stock-based compensation	3,810	6,278	7,542	12,935
Consulting, outsourcing and professional fees	29,398	22,702	55,396	43,409
Data processing and computer related	11,610	10,417	22,913	20,345
Facilities, supplies and other costs	14,098	13,586	28,200	27,080
Amortization	6,792	5,997	13,023	11,897
Depreciation	5,391	5,584	11,002	10,790
Total expenses	183,803	171,216	361,699	339,406
Income from operations	53,957	57,172	108,554	110,517
Net (loss) gain from investments	(1,948)	3,594	5,330	21,073
Interest and dividend income	1,436	1,502	2,980	3,202
Interest expense	(155)	(415)	(359)	(886)
Other income	0	1,070	0	1,070
Equity in earnings of unconsolidated affiliate	29,530	23,519	58,479	47,593
Net income before income taxes	82,820	86,442	174,984	182,569
Income taxes	28,707	32,603	62,831	68,872
Net income	54,113	53,839	112,153	113,697
Less: Net income attributable to the noncontrolling interest	(510)	(361)	(822)	(799)
Net income attributable to SEI Investments Company	$ 53,603	$ 53,478	$ 111,331	$ 112,898
Basic earnings per common share	$ 0.29	$ 0.28	$ 0.60	$ 0.60
Diluted earnings per common share	$ 0.29	$ 0.28	$ 0.59	$ 0.59
Dividends declared per common share	$ 0.12	$ 0.10	$ 0.12	$ 0.10

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Business Segment Information (Reconciliation of Total Operating Profit Reported for the Business Segments to Income from Operations in Consolidated Statements of Operations) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Business Segment Information
Total operating profit from segments above	$ 64,144	$ 66,745	$ 129,117	$ 129,498
Corporate overhead expenses	(10,720)	(9,941)	(21,368)	(19,658)
Noncontrolling interest reflected in segments	533	368	805	677
Income from operations	$ 53,957	$ 57,172	$ 108,554	$ 110,517

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Composition of Certain Financial Statement Captions (Tables)

6 Months Ended

Jun. 30, 2011

Composition of Certain Financial Statement Captions

Receivables

	June 30, 2011			December 31, 2010
Trade receivables	$	41,419		$	34,528
Fees earned, not billed		101,355			93,506
Other receivables		7,519			9,651
		150,293			137,685
Less: Allowance for doubtful accounts		(868	)		(1,195	)
	$	149,425		$	136,490

Property and Equipment

	June 30, 2011			December 31, 2010
Buildings	$	136,411		$	135,935
Equipment		67,266			63,902
Land		9,890			9,890
Purchased software		77,178			74,720
Furniture and fixtures		18,691			18,566
Leasehold improvements		4,700			4,250
Construction in progress		186			121
		314,322			307,384
Less: Accumulated depreciation and amortization		(177,779	)		(166,816	)
Property and Equipment, net	$	136,543		$	140,568

Accrued Liabilities

	June 30, 2011		December 31, 2010
Accrued employee compensation	$	26,547	$	43,747
Accrued employee benefits and other personnel		5,651		6,988
Accrued consulting, outsourcing and professional fees		20,576		16,390
Accrued brokerage fees		9,571		11,942
Accrued sub-advisory, distribution and other asset management fees		15,769		16,778
Accrued income taxes		0		2,077
Other accrued liabilities		23,221		23,488
Total accrued liabilities	$	101,335	$	121,410

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Document and Entity Information	6 Months Ended
	Jun. 30, 2011	Jul. 31, 2011
Document and Entity Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
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		182,579,428

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Shareholder's Equity (Schedule of Recognition of Compensation Cost) (Details) (USD $) In Thousands	Jun. 30, 2011
Unrecognized compensation cost	$ 44,986
Remainder of 2011 [Member]
Unrecognized compensation cost	7,410
2012 [Member]
Unrecognized compensation cost	14,456
2013 [Member]
Unrecognized compensation cost	12,605
2014 [Member]
Unrecognized compensation cost	5,543
2015 [Member]
Unrecognized compensation cost	3,279
2016 [Member]
Unrecognized compensation cost	$ 1,693

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Shareholders' Equity (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2011

Jun. 30, 2010

Shareholders' Equity

Stock-Based Compensation Expense

	Three Months Ended June 30,
	2011			2010
Stock-based compensation expense		3,810		$	6,278
Less: Deferred tax benefit		(1,427	)		(2,367	)
Stock-based compensation expense, net of tax	$	2,383		$	3,911

	Six Months Ended June 30,
	2011			2010
Stock-based compensation expense	$	7,542		$	12,935
Less: Deferred tax benefit		(2,825	)		(4,880	)
Stock-based compensation expense, net of tax	$	4,717		$	8,055

Schedule of Recognition of Compensation Cost

Period	Stock-Based Compensation Expense
Remainder of 2011	$	7,410
2012		14,456
2013		12,605
2014		5,543
2015		3,279
2016		1,693
	$	44,986

Reconciliation of Non-Controlling Interest on the Consolidated Balance Sheet

	Noncontrolling interest
Balance, January 1, 2011	$	15,155
Net income attributable to noncontrolling interest		822
Foreign currency translation adjustments		925
Balance, June 30, 2011	$	16,902

	Noncontrolling interest
Balance, January 1, 2010	$	121,895
Net income attributable to noncontrolling interest		799
Foreign currency translation adjustments		(794	)
Deconsolidation of LSV		(65,522	)
Deconsolidation of LSV Employee Group		(43,536	)
Balance, June 30, 2010	$	12,842

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Shareholder's Equity (Stock-Based Compensation Expense) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Shareholders' Equity
Stock-based compensation expense	$ 3,810	$ 6,278	$ 7,542	$ 12,935
Less: Deferred tax benefit	(1,427)	(2,367)	(2,825)	(4,880)
Stock-based compensation expense, net of tax	$ 2,383	$ 3,911	$ 4,717	$ 8,055

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Fair Value Measurements

6 Months Ended

Jun. 30, 2011

Fair Value Measurements

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 structured investment vehicles (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 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. Level 3 financial assets consist of senior note obligations issued by SIVs. The Company did not have any Level 3 financial liabilities at June 30, 2011 or December 31, 2010. There were no transfers of financial assets between levels within the fair value hierarchy during the six months ended June 30, 2011.

Valuation of SIV Securities

The underlying collateral of the SIV securities is mainly comprised of asset-backed securities and collateralized debt obligations. The Company utilizes the services of a third party independent firm to assist in determining the fair value of the SIV security owned. Given the lack of any reliable market data on the SIV security, the firm utilized a valuation model that employs a net asset approach which considers the value of the underlying collateral of the SIV security to determine its fair value. Management evaluates the value received from the firm and considers other information, such as the existence of any current market activity, to determine the fair value of the SIV securities.

The model used by the independent valuation firm to determine the fair value of the SIV security attempts to value the underlying collateral of the SIV security 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 and recent market developments. Each security that makes up the underlying collateral is specifically identified by its CUSIP or ISIN number and 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. Other factors may be considered that are specific to the SIV security that may affect the fair value of the SIV security.

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 model of the independent firm giving consideration to other market factors and risk premiums. Given the lack of any significant trading activity for the SIV security owned by the Company, management believes that market prices may not represent the implied fair value of the SIV security owned by the Company.

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 June 30, 2011
	Fair Value Measurements at Reporting Date Using
	Total		Active Markets for  Identical Assets (Level 1)		Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	9,526	$	9,526	$	0	$	0
Fixed income available-for-sale securities		64,770		0		64,770		0
Fixed income securities owned		21,032		0		21,032		0
Trading securities issued by SIVs		60,053		0		0		60,053
Other trading securities		4,130		4,130		0		0
	$	159,511	$	13,656	$	85,802	$	60,053

	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 issued by SIVs		100,645		0		0		100,645
Other trading securities		3,949		3,949		0		0
	$	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, 2011 to June 30, 2011:

	Trading Securities Issued by SIVs
Balance, January 1, 2011	$	100,645
Purchases		0
Issuances		0
Principal prepayments and settlements		(10,806	)
Sales		(34,706	)
Total gains or (losses) (realized/unrealized):
Included in earnings		4,920
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance June 30, 2011	$	60,053

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 June 30, 2010:

	Trading Securities Issued by SIVs
Balance, January 1, 2010	$	120,714
Purchases		536
Issuances		0
Principal prepayments and settlements		(23,755	)
Sales		(16,416	)
Total gains or (losses) (realized/unrealized):
Included in earnings		21,262
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance June 30, 2010	$	102,341

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Accumulated Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2011

Accumulated Comprehensive Income (Loss)

Accumulated Comprehensive Income (Loss), Net of Tax

	Foreign Currency Translation Adjustments		Unrealized Holding  Gains (Losses) on Investments		Accumulated Other Comprehensive Income (Loss)
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 income for the six months ended June 30, 2011	$	4,295		$	515	$	4,810
Less: Total comprehensive income attributable to noncontrolling interest for the six months ended June 30, 2011		(925	)		0		(925	)
Total comprehensive income attributable to SEI Investments Company for the six months ended June 30, 2011	$	3,370		$	515	$	3,885
Total accumulated comprehensive income at June 30, 2011	$	5,447		$	1,854	$	7,301
Less: Total accumulated comprehensive income attributable to noncontrolling interest at June 30, 2011		(259	)		0		(259	)
Total accumulated comprehensive income attributable to SEI Investments Company at June 30, 2011	$	5,188		$	1,854	$	7,042

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Marketable Securities (Investments Available for Sale) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Investment Available for Sale, Cost Amount	$ 71,497	$ 72,647
Investment Available for Sale, Gross Unrealized Gains	2,807	2,137
Investment Available for Sale, Gross Unrealized Losses	(8)	(14)
Investment Available for Sale, Fair Value	74,296	74,770
SEI-Sponsored Mutual Funds [Member]
Investment Available for Sale, Cost Amount	8,971	5,086
Investment Available for Sale, Gross Unrealized Gains	244	279
Investment Available for Sale, Gross Unrealized Losses	(8)	(14)
Investment Available for Sale, Fair Value	9,207	5,351
Other Mutual Funds [Member]
Investment Available for Sale, Cost Amount	277	443
Investment Available for Sale, Gross Unrealized Gains	42	59
Investment Available for Sale, Gross Unrealized Losses	0	0
Investment Available for Sale, Fair Value	319	502
Debt Securities [Member]
Investment Available for Sale, Cost Amount	62,249	67,118
Investment Available for Sale, Gross Unrealized Gains	2,521	1,799
Investment Available for Sale, Gross Unrealized Losses	0	0
Investment Available for Sale, Fair Value	$ 64,770	$ 68,917

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Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Composition of Certain Financial Statement Captions
Accrued employee compensation	$ 26,547	$ 43,747
Accrued employee benefits and other personnel	5,651	6,988
Accrued consulting, outsourcing and professional fees	20,576	16,390
Accrued brokerage fees	9,571	11,942
Accrued sub-advisory, distribution and other asset management fees	15,769	16,778
Accrued income taxes	0	2,077
Other accrued liabilities	23,221	23,488
Total accrued liabilities	$ 101,335	$ 121,410

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Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2011

Marketable Securities

Investments Available for Sale

	As of June 30, 2011
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	8,971	$	244	$	(8	)	$	9,207
Other mutual funds		277		42		0			319
Debt securities		62,249		2,521		0			64,770
	$	71,497	$	2,807	$	(8	)	$	74,296
	As of December 31, 2010
	Cost Amount		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

	As of June 30, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SIV securities	$	153,477	$	0	$	(93,424	)	$	60,053
LSV-sponsored mutual funds		2,049		2,081		0			4,130
	$	155,526	$	2,081	$	(93,424	)	$	64,183

	As of 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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Business Segment Information

6 Months Ended

Jun. 30, 2011

Business Segment Information

Business Segment Information

Note 10. 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 processing, fund processing, and operational 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^®.

The information in the following tables is derived from the Company's internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three and six months ended June 30, 2011 and 2010. Management evaluates Company assets on a consolidated basis during interim periods. The accounting policies of the reportable business segments are the same as those described in Note 1 to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2010.

The following tables highlight certain unaudited financial information about each of the Company's business segments for the three months ended June 30, 2011 and 2010.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2011
Revenues	$	87,873		$	49,768		$	54,731		$	44,452		$	936		$	237,760
Expenses		86,274			27,734			27,406			29,282			2,920			173,616
Operating profit (loss)	$	1,599		$	22,034		$	27,325		$	15,170		$	(1,984	)	$	64,144
Operating margin		2	%		44	%		50	%		34	%		N/A			27	%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2010
Revenues	$	90,091		$	46,398		$	51,446		$	39,440		$	1,013		$	228,388
Expenses		78,612			28,120			26,576			25,596			2,739			161,643
Operating profit (loss)	$	11,479		$	18,278		$	24,870		$	13,844		$	(1,726	)	$	66,745
Operating margin		13	%		39	%		48	%		35	%		N/A			29	%

A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the quarters ended June 30, 2011 and 2010 is as follows:

	2011			2010
Total operating profit from segments above	$	64,144		$	66,745
Corporate overhead expenses		(10,720	)		(9,941	)
Noncontrolling interest reflected in segments		533			368
Income from operations	$	53,957		$	57,172

The following tables provide additional information for the three months ended June 30, 2011 and 2010 pertaining to our business segments:

	Capital Expenditures					Depreciation
	2011			2010		2011		2010
Private Banks	$	6,783		$	7,559	$	3,962	$	4,044
Investment Advisors		2,296			2,673		556		592
Institutional Investors		251			555		268		291
Investment Managers		89			752		435		473
Investments in New Businesses		92			135		29		36
Total from business segments	$	9,511		$	11,674	$	5,250	$	5,436
Corporate Overhead		(24	)		157		141		148
	$	9,487		$	11,831	$	5,391	$	5,584

	Amortization
	2011		2010
Private Banks	$	4,608	$	3,765
Investment Advisors		1,551		1,364
Institutional Investors		196		301
Investment Managers		131		206
Investments in New Businesses		65		118
Total from business segments	$	6,551	$	5,754
Corporate Overhead		241		243
	$	6,792	$	5,997

The following tables highlight certain unaudited financial information about each of the Company's business segments for the six months ended June 30, 2011 and 2010.

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2011
Revenues	$	174,582		$	97,876		$	107,916		$	87,893		$	1,986		$	470,253
Expenses		168,677			54,774			54,359			57,281			6,045			341,136
Operating profit (loss)	$	5,905		$	43,102		$	53,557		$	30,612		$	(4,059	)	$	129,117
Operating margin		3	%		44	%		50	%		35	%		N/A			27	%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2010
Revenues	$	177,212		$	91,861		$	101,785		$	77,050		$	2,015		$	449,923
Expenses		156,211			55,703			52,956			50,155			5,400			320,425
Operating profit (loss)	$	21,001		$	36,158		$	48,829		$	26,895		$	(3,385	)	$	129,498
Operating margin		12	%		39	%		48	%		35	%		N/A			29	%

A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the six months ended June 30, 2011 and 2010 is as follows:

	2011			2010
Total operating profit from segments above	$	129,117		$	129,498
Corporate overhead expenses		(21,368	)		(19,658	)
Noncontrolling interest reflected in segments		805			677
Income from operations	$	108,554		$	110,517

The following tables provide additional information for the six months ended June 30, 2011 and 2010 pertaining to our business segments:

	Capital Expenditures				Depreciation
	2011		2010		2011		2010
Private Banks	$	17,813	$	15,436	$	8,000	$	7,752
Investment Advisors		6,038		5,498		1,147		1,156
Institutional Investors		1,132		1,257		560		567
Investment Managers		1,873		1,871		938		943
Investments in New Businesses		304		291		59		73
Total from business segments	$	27,160	$	24,353	$	10,704	$	10,491
Corporate Overhead		350		426		298		299
	$	27,510	$	24,779	$	11,002	$	10,790

	Amortization
	2011		2010
Private Banks	$	8,837	$	7,466
Investment Advisors		2,969		2,704
Institutional Investors		363		605
Investment Managers		246		411
Investments in New Businesses		124		225
Total from business segments	$	12,539	$	11,411
Corporate Overhead		484		486
	$	13,023	$	11,897

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2011

Summary of Significant Accounting Policies

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, fund processing, and investment management business outsourcing 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 utilize the Company's proprietary software systems to track investment activities in multiple types of investment accounts, including personal trust, corporate trust, institutional trust, and non-trust investment accounts, thereby allowing banks and trust companies to outsource trust and investment related activities. 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.

The fund processing solution offers a full range of administration and distribution support services to mutual funds, collective trust funds, single-manager hedge funds, funds of hedge funds, private equity funds and other types of investment funds. Administrative services include fund accounting, trustee and custodial support, legal support, transfer agency and shareholder servicing. Distribution support services range from market and industry insight and analysis to identifying distribution opportunities. Revenues from fund processing solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

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.

Basis of Presentation

The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company's Annual Report on Form 10-K has been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of June 30, 2011, the results of operations for the three and six months ended June 30, 2011 and 2010, and cash flows for the six month periods ended June 30, 2011 and 2010. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2010.

There have been no significant changes in significant accounting policies during the six months ended June 30, 2011 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2010.

Cash and Cash Equivalents

Cash and cash equivalents includes $302,202 and $383,946 at June 30, 2011 and December 31, 2010, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds.

Restricted Cash

Restricted cash includes $3,000 at June 30, 2011 and December 31, 2010 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $1,000 at June 30, 2011 and December 31, 2010 segregated in special reserve accounts for the benefit of customers of the Company's broker-dealer subsidiary, SEI Investments Distribution Co. (SIDCO), in accordance with certain rules established by the Securities and Exchange Commission for broker-dealers.

Capitalized Software

The Company capitalized $20,537 and $17,578 of software development costs during the six months ended June 30, 2011 and 2010, respectively. As of June 30, 2011, capitalized software placed into service included on the accompanying Consolidated Balance Sheet had a weighted average remaining life of approximately 11.0 years. Amortization expense related to capitalized software was $12,532 and $11,400 during the six months ended June 30, 2011 and 2010, respectively.

Software development costs capitalized during the six months ended June 30, 2011 and 2010 relates to the continued development of the Global Wealth Platform (GWP). As of June 30, 2011, the net book value of GWP was $289,023 (net of accumulated amortization of $74,400), including $12,161 of capitalized software development costs in-progress associated with future releases. GWP has an estimated useful life of 15 years and a weighted average remaining life of 11.0 years. Amortization expense for GWP was $12,249 and $11,117 during the six months ended June 30, 2011 and 2010, respectively.

Earnings per Share

The calculations of basic and diluted earnings per share for the three months ended June 30, 2011 and 2010 are:

	For the Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	53,603		184,585	$	.29
Dilutive effect of stock options		0		2,435
Diluted earnings per common share	$	53,603		187,020	$	.29
	For the Three Months Ended June 30, 2010
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	53,478		189,356	$	.28
Dilutive effect of stock options		0		2,144
Diluted earnings per common share	$	53,478		191,500	$	.28

Employee stock options to purchase 7,675,000 and 10,422,000 shares of common stock, with an average exercise price of $28.25 and $24.87, were outstanding during the three months ended June 30, 2011 and 2010, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

The calculations of basic and diluted earnings per share for the six months ended June 30, 2011 and 2010 are:

	For the Six Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	111,331		185,186	$	.60
Dilutive effect of stock options		0		2,571
Diluted earnings per common share	$	111,331		187,757	$	.59
	For the Six Months Ended June 30, 2010
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	112,898		189,652	$	.60
Dilutive effect of stock options		0		1,629
Diluted earnings per common share	$	112,898		191,281	$	.59

Employee stock options to purchase 7,606,000 and 16,210,000 shares of common stock, with an average exercise price of $28.26 and $23.46, were outstanding during the six months ended June 30, 2011 and 2010, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

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 is currently evaluating the requirements of the guidance and has not yet determined its impact on the Company's 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 adoption of this guidance may impact the presentation of the Company's consolidated financial statements, but it will not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income. The guidance is effective for interim and annual periods beginning after December 15, 2011 and will require retrospective application for all periods presented.

Statements of Cash Flows

For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the six months ended June 30:

	2011			2010
Net income	$	112,153		$	113,697
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		11,002			10,790
Amortization		13,023			11,897
Equity in earnings of unconsolidated affiliate		(58,479	)		(47,593	)
Distributions received from unconsolidated affiliate		50,760			23,117
Stock-based compensation		7,542			12,935
Provision for losses on receivables		(327	)		(893	)
Deferred income tax expense		(36	)		635
Net realized gains from investments		(5,330	)		(21,073	)
Change in other long-term liabilities		1,904			26
Change in other assets		(1,658	)		(457	)
Other		3,858			(3,493	)
Change in current asset and liabilities
Decrease (increase) in
Receivables from regulated investment companies		(1,953	)		(1,503	)
Receivables		(15,353	)		(14,324	)
Other current assets		(211	)		308
Increase (decrease) in
Accounts payable		(1,727	)		(1,774	)
Accrued liabilities		(21,081	)		(22,999	)
Deferred revenue		(1,247	)		(709	)
Total adjustments		(19,313	)		(55,110	)
Net cash provided by operating activities	$	92,840		$	58,587

As previously disclosed in the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010, during the three months ended September 30, 2010, the Company identified that it had incorrectly classified certain accounts payable related to the purchase of computer software during the three months ended June 30, 2010 as Additions to property and equipment in the Cash flows from investing activities section on the consolidated statement of cash flows in the six months ended June 30, 2010. The effect of the misclassification resulted in Cash flows provided by operating activities and Cash flows used in investing activities being overstated by $7,102 for the six months ended June 30, 2010. The Company has revised its consolidated statement of cash flows for the six months ended June 30, 2010 to appropriately classify this amount to the Cash flows from operating activities. This misclassification had no effect on the consolidated balances sheets, consolidated statements of operations or consolidated statements of comprehensive income.

Reclassifications

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

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Variable Interest Entities (Narrative) (Details)	6 Months Ended
	Jun. 30, 2011
Variable Interest Entities
Percentage not approached by expected return on any VIE investment	50.00%
Other financial obligation to VIEs	0

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Lines of Credit

6 Months Ended

Jun. 30, 2011

Lines of Credit

Lines of Credit

Note 7. Lines of Credit

The Company has a five-year $300,000 Credit Agreement (the Credit Facility) which expires in July 2012, at which time any aggregate principal amount of loans outstanding becomes payable in full. Any borrowings made under the Credit Facility will accrue interest at 0.450 percent above the London Interbank Offer Rate ("LIBOR"). There is also a commitment fee equal to 0.09 percent per annum on the daily unused portion of the facility. The aggregate amount of the Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The Credit Facility, as amended, 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 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 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 Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the Credit Facility may be terminated. As of June 30, 2011, the Company's ability to borrow from the Credit Facility is not limited by any covenant of the agreement.

The Company made principal payments of $55,000 during the six months ended June 30, 2011. As of June 30, 2011, the outstanding balance of the Credit Facility was $40,000 and is included in Long-term debt on the accompanying Consolidated Balance Sheet. The Company was in compliance with all covenants of the Credit Facility at June 30, 2011.

The Company considers the book value of long-term debt related to the borrowings through the Credit Facility to be representative of its fair value.

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 the three months ended June 30, 2011.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2011

Commitments and Contingencies

Commitments and Contingencies

Note 12. Commitments and Contingencies

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. The Court has permitted the parties to file supplemental briefing due July 13, 2011 with replies due July 20, 2011, after which the motion will be fully briefed. 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. 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 which is set for hearing on October 4-6, 2011; 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. 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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Shareholders' Equity

6 Months Ended

Jun. 30, 2011

Shareholders' Equity

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. All outstanding stock options have performance-based vesting provisions specific to each option grant that tie the vesting of the applicable stock options to the Company's financial performance. The Company's stock options vest at a rate of 50 percent when specified diluted earnings per share targets are achieved, and the remaining 50 percent when secondary, higher specified diluted earnings per share targets are achieved. The amount of stock-based compensation expense is based upon management's estimate of when the earnings per share targets may be achieved.

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.

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended June 30, 2011 and 2010, respectively, as follows:

	Three Months Ended June 30,
	2011			2010
Stock-based compensation expense		3,810		$	6,278
Less: Deferred tax benefit		(1,427	)		(2,367	)
Stock-based compensation expense, net of tax	$	2,383		$	3,911

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the six months ended June 30, 2011 and 2010, respectively, as follows:

	Six Months Ended June 30,
	2011			2010
Stock-based compensation expense	$	7,542		$	12,935
Less: Deferred tax benefit		(2,825	)		(4,880	)
Stock-based compensation expense, net of tax	$	4,717		$	8,055

As of June 30, 2011, there was approximately $44,986 of unrecognized compensation cost remaining, adjusted for estimated forfeitures, related to unvested employee stock options that management expects will vest and is being amortized. The Company estimates that compensation cost will be recognized according to the following schedule:

Period	Stock-Based Compensation Expense
Remainder of 2011	$	7,410
2012		14,456
2013		12,605
2014		5,543
2015		3,279
2016		1,693
	$	44,986

During the six months ended June 30, 2010, the Company revised its previous estimate made as of December 31, 2009 of when certain vesting targets are expected to be achieved. This change in management's estimate resulted in a decrease of $2,492 in stock-based compensation expense in the six months ended June 30, 2010. There was no change in management's estimate for the achievement of vesting targets during the six months ended June 30, 2011.

The Company issues new common shares associated with the exercise of stock options. The total intrinsic value of options exercised during the six months ended June 30, 2011 and 2010 was $8,205 and $4,921, respectively. The total options exercisable as of June 30, 2011 had an intrinsic value of $63,155. The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company's common stock as of June 30, 2011 and the exercise price of the shares. The market value of the Company's common stock as of June 30, 2011 was $22.51 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of June 30, 2011 was $17.66. Total options that were outstanding as of June 30, 2011 was 26,349,000.

Common Stock Buyback

The Company's Board of Directors has authorized the repurchase of the Company's common stock on the open market or through private transactions. The Company purchased 4,215,000 shares at a total cost of $95,144 during the six months ended June 30, 2011. As of June 30, 2011, the Company has $112,298 of authorization remaining for the purchase of our common stock under the program.

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.

Cash Dividend

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. Cash dividends declared during the six months ended June 30, 2011 and 2010 were $22,041 and $18,890, respectively.

Noncontrolling Interest

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2011 to June 30, 2011:

	Noncontrolling interest
Balance, January 1, 2011	$	15,155
Net income attributable to noncontrolling interest		822
Foreign currency translation adjustments		925
Balance, June 30, 2011	$	16,902

The following table provides a reconciliation of Noncontrolling interest on the Consolidated Balance Sheet for the period from January 1, 2010 to June 30, 2010:

	Noncontrolling interest
Balance, January 1, 2010	$	121,895
Net income attributable to noncontrolling interest		799
Foreign currency translation adjustments		(794	)
Deconsolidation of LSV		(65,522	)
Deconsolidation of LSV Employee Group		(43,536	)
Balance, June 30, 2010	$	12,842

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Summary of Significant Accounting Policies (Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Summary of Significant Accounting Policies
Net income	$ 54,113	$ 53,839	$ 112,153	$ 113,697
Depreciation	5,391	5,584	11,002	10,790
Amortization	6,792	5,997	13,023	11,897
Equity in earnings of unconsolidated affiliate			(58,479)	(47,593)
Distributions received from unconsolidated affiliate			50,760	23,117
Stock-based compensation	3,810	6,278	7,542	12,935
Provision for losses on receivables			(327)	(893)
Deferred income tax expense			(36)	635
Net realized gains from investments			(5,330)	(21,073)
Change in other long-term liabilities			1,904	26
Change in other assets			(1,658)	(457)
Other			3,858	(3,493)
Decrease (increase) in receivables from regulated investment companies			(1,953)	(1,503)
Decrease (increase) in receivables			(15,353)	(14,324)
Decrease (increase) in other current assets			(211)	308
Increase (decrease) in accounts payable			(1,727)	(1,774)
Increase (decrease) in accrued liabilities			(21,081)	(22,999)
Increase (decrease) in deferred revenue			(1,247)	(709)
Total adjustments			(19,313)	(55,110)
Net cash provided by operating activities			$ 92,840	$ 58,587

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Marketable Securities

6 Months Ended

Jun. 30, 2011

Marketable Securities

Marketable Securities

Note 6. Marketable Securities

Investments Available for Sale

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

	As of June 30, 2011
	Cost Amount		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SEI-sponsored mutual funds	$	8,971	$	244	$	(8	)	$	9,207
Other mutual funds		277		42		0			319
Debt securities		62,249		2,521		0			64,770
	$	71,497	$	2,807	$	(8	)	$	74,296
	As of December 31, 2010
	Cost Amount		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 at June 30, 2011 and December 31, 2010 were $1,854 (net of income tax expense of $945) and $1,339 (net of income tax expense of $784), respectively. These net unrealized gains are reported as a separate component of Accumulated other comprehensive income on the accompanying Consolidated Balance Sheets.

Gross realized gains and losses from available-for-sale securities during the six months ended June 30, 2011 and 2010 were minimal. Gains and losses from available-for-sale securities are reflected in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations.

The Company's debt securities classified as available-for-sale securities are issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased to satisfy applicable regulatory requirements of SEI Private Trust Company (SPTC) and have maturity dates which range from 2020 to 2040.

Trading Securities

Trading securities of the Company consist of:

	As of June 30, 2011
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
SIV securities	$	153,477	$	0	$	(93,424	)	$	60,053
LSV-sponsored mutual funds		2,049		2,081		0			4,130
	$	155,526	$	2,081	$	(93,424	)	$	64,183

	As of 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 (loss) gain from investments on the accompanying Consolidated Statements of Operations.

Through June 30, 2011, the Company recognized $139,915 in cumulative losses from SIV securities and SIV-related issues. During the six months ended June 30, 2011 and 2010, the Company recognized net gains from SIV securities of $4,920 and $21,262, respectively. Of the net gains recognized during the six months ended June 30, 2011, gains of $6,232 resulted from cash payments received from the SIV securities and losses of $1,312 resulted from a decrease in fair value at June 30, 2011. Of the gains recognized during the six months ended June 30, 2010, $14,446 resulted from cash payments received from the SIV securities and $6,433 was from an increase in fair value at June 30, 2010. The net gains from the SIV securities are reflected in Net (loss) gain 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 in 2011 as the fair value of the Stanfield Victoria note at December 31, 2010 was not different than the sale price received.

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 and Australian companies as well as various other global securities. The underlying securities held by the funds are translated into U.S. dollars within the funds. The net gains (losses) from the change in fair value of the funds during the three and six months ended June 30, 2011 and 2010 were minimal.

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 $21,032 at June 30, 2011. The changes in fair value recognized in the three and six months ended June 30, 2011 were minimal.

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Business Segment Information (Unaudited Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues	$ 237,760	$ 228,388	$ 470,253	$ 449,923
Expenses	173,616	161,643	341,136	320,425
Operating profit (loss)	64,144	66,745	129,117	129,498
Operating margin	27.00%	29.00%	27.00%	29.00%
Private Banks [Member]
Revenues	87,873	90,091	174,582	177,212
Expenses	86,274	78,612	168,677	156,211
Operating profit (loss)	1,599	11,479	5,905	21,001
Operating margin	2.00%	13.00%	3.00%	12.00%
Investment Advisors [Member]
Revenues	49,768	46,398	97,876	91,861
Expenses	27,734	28,120	54,774	55,703
Operating profit (loss)	22,034	18,278	43,102	36,158
Operating margin	44.00%	39.00%	44.00%	39.00%
Institutional Investors [Member]
Revenues	54,731	51,446	107,916	101,785
Expenses	27,406	26,576	54,359	52,956
Operating profit (loss)	27,325	24,870	53,557	48,829
Operating margin	50.00%	48.00%	50.00%	48.00%
Investment Managers [Member]
Revenues	44,452	39,440	87,893	77,050
Expenses	29,282	25,596	57,281	50,155
Operating profit (loss)	15,170	13,844	30,612	26,895
Operating margin	34.00%	35.00%	35.00%	35.00%
Investments in New Businesses [Member]
Revenues	936	1,013	1,986	2,015
Expenses	2,920	2,739	6,045	5,400
Operating profit (loss)	$ (1,984)	$ (1,726)	$ (4,059)	$ (3,385)
Operating margin	0.00%	0.00%	0.00%	0.00%

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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Comprehensive Income
Unrealized holding gains during the period, income tax expense	$ 348	$ 304	$ 236	$ 649
Reclassification adjustment for losses realized in net income, income tax benefit	$ (15)	$ 2	$ (75)	$ 17

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Investment in Unconsolidated Affiliate

6 Months Ended

Jun. 30, 2011

Investment in Unconsolidated Affiliate

Investment in Unconsolidated Affiliate

Note 2. Investment in Unconsolidated Affiliate

The Company has an investment in the general partnership LSV Asset Management (LSV). LSV is a 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 small number of SEI-sponsored mutual funds. Currently, the Company's total partnership interest in LSV is approximately 41 percent. The Company accounts for its interest in LSV using the equity method. The Company's interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.

At June 30, 2011, the Company's total investment in LSV was $72,439. The investment in LSV exceeded the underlying equity in the net assets of LSV by $3,936, 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 $50,760 and $44,359 in the six months ended June 30, 2011 and 2010, respectively. The partnership distribution payment of $21,242 received in the three months ended March 31, 2010 is reflected in LSV and LSV Employee Group cash balances, net on the accompanying Consolidated Statement of Cash Flows.

The Company's proportionate share in the earnings of LSV was $29,530 and $23,519 during the three months ended June 30, 2011 and 2010, respectively. During the six months ended June 30, 2011 and 2010, the Company's proportionate share in the earnings of LSV was $58,479 and $47,593, respectively.

The following table contains the condensed statements of operations of LSV for the three months ended June 30, 2011 and 2010:

	Three Months Ended June 30,
	2011		2010
Revenues	$	81,748	$	65,011
Net income		72,018		56,641

The following table contains the condensed statements of operations of LSV for the six months ended June 30, 2011 and 2010:

	Six Months Ended June 30,
	2011		2010
Revenues	$	161,150	$	131,020
Net income		141,964		114,613

Guaranty Agreements

In 2006, LSV Employee Group purchased an eight percent interest in LSV from two existing partners. 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 Company agreed to provide a Guaranty Agreement to the lenders of all obligations of LSV Employee Group under the Credit Agreement. 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 remain in full force and effect with respect to the amended Credit Agreement. The principal amount and interest of the term loan are paid in quarterly installments. LSV Employee Group made principal payments of $8,793 during 2011. As of July 31, 2011, the remaining unpaid principal balance of the term loan was $1,298.

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 a principal payment of $183 during July 2011. As of July 31, 2011, the remaining unpaid principal balance of the term loan was $3,472.

The Company's direct interest in LSV is 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.

As of July 31, 2011, the Company, in its capacity as guarantor, currently has no obligation of payment relating to the term loans of LSV Employee Group or LSV Employee Group II and, furthermore, fully expects that LSV Employee Group and LSV Employee Group II will meet all of their future obligations regarding their respective term loans.

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Fair Value Measurements (Fair Value of Certain Financial Assets and Liabilities) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Equity available-for-sale securities	$ 9,526	$ 5,853
Fixed income available-for-sale securities	64,770	68,917
Fixed income securities owned	21,032	0
Trading securities issued by SIVs	60,053	100,645
Other trading securities	4,130	3,949
Assets, fair value	159,511	179,364
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Equity available-for-sale securities	9,526	5,853
Fixed income available-for-sale securities	0	0
Fixed income securities owned	0
Trading securities issued by SIVs	0	0
Other trading securities	4,130	3,949
Assets, fair value	13,656	9,802
Significant Other Observable Inputs (Level 2) [Member]
Equity available-for-sale securities	0	0
Fixed income available-for-sale securities	64,770	68,917
Fixed income securities owned	21,032
Trading securities issued by SIVs	0	0
Other trading securities	0	0
Assets, fair value	85,802	68,917
Significant Unobservable Inputs (Level 3) [Member]
Equity available-for-sale securities	0	0
Fixed income available-for-sale securities	0	0
Fixed income securities owned	0
Trading securities issued by SIVs	60,053	100,645
Other trading securities	0	0
Assets, fair value	$ 60,053	$ 100,645

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Summary of Significant Accounting Policies (Calculation of Basic and Diluted Earnings per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Summary of Significant Accounting Policies
Basic earnings per common share, Income (Numerator)	$ 53,603	$ 53,478	$ 111,331	$ 112,898
Basic earnings per common share, Shares (Denominator)	184,585	189,356	185,186	189,652
Basic earnings per common share, Per Share Amount	$ 0.29	$ 0.28	$ 0.60	$ 0.60
Dilutive effect of stock options, Income (Numerator)	0	0	0	0
Dilutive effect of stock options, Shares (Denominator)	2,435	2,144	2,571	1,629
Diluted earnings per common share, Income (Numerator)	$ 53,603	$ 53,478	$ 111,331	$ 112,898
Diluted earnings per common share, Shares (Denominator)	187,020	191,500	187,757	191,281
Diluted earnings per common share, Per Share Amount	$ 0.29	$ 0.28	$ 0.59	$ 0.59

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Business Segment Information (Narrative) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Business Segment Information
Inter-segment revenue	$ 0	$ 0	$ 0	$ 0

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Variable Interest Entities

6 Months Ended

Jun. 30, 2011

Variable Interest Entities

Variable Interest Entities

Note 3. Variable Interest Entities

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 and net capital gains 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. Some of the Company's investment products have been determined to be VIEs at inception.

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 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, is not 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 not significant. 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 not significant to the total assets of the Company.

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Marketable Securities (Narrative) (Details) (USD $)	6 Months Ended	12 Months Ended	6 Months Ended					12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 U.S. Government Agency and Commercial Paper Securities [Member]	Jun. 30, 2011 SIV Securities [Member]	Jun. 30, 2010 SIV Securities [Member]	Jun. 30, 2011 SEI Private Trust Company [Member]	Jun. 30, 2011 Stanfield Victoria [Member]	Dec. 31, 2010 Stanfield Victoria [Member]
Net unrealized holding gains	$ 1,854,000	$ 1,339,000
Unrealized holding gains during the period, income tax expense	945,000	784,000
Debt maturity, minimum						2020
Debt maturity, maximum			one year			2040
Cumulative losses from SIV securities and SIV related-issues	139,915,000
Net gain from sale of SIV securities				4,920,000	21,262,000
Gains from cash payments received from SIV securities				6,232,000	14,446,000
Gains or losses from increase/decrease in fair value of SIV securities				(1,312,000)	6,433,000
Gain or loss recognized from sale of note							0	0
Securities owned (Note 6)	$ 21,032,000	$ 0

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Business Segment Information (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2010

Jun. 30, 2011

Jun. 30, 2010

Business Segment Information

Financial Information About Business Segments

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2011
Revenues	$	87,873		$	49,768		$	54,731		$	44,452		$	936		$	237,760
Expenses		86,274			27,734			27,406			29,282			2,920			173,616
Operating profit (loss)	$	1,599		$	22,034		$	27,325		$	15,170		$	(1,984	)	$	64,144
Operating margin		2	%		44	%		50	%		34	%		N/A			27	%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Three Months Ended June 30, 2010
Revenues	$	90,091		$	46,398		$	51,446		$	39,440		$	1,013		$	228,388
Expenses		78,612			28,120			26,576			25,596			2,739			161,643
Operating profit (loss)	$	11,479		$	18,278		$	24,870		$	13,844		$	(1,726	)	$	66,745
Operating margin		13	%		39	%		48	%		35	%		N/A			29	%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2011
Revenues	$	174,582		$	97,876		$	107,916		$	87,893		$	1,986		$	470,253
Expenses		168,677			54,774			54,359			57,281			6,045			341,136
Operating profit (loss)	$	5,905		$	43,102		$	53,557		$	30,612		$	(4,059	)	$	129,117
Operating margin		3	%		44	%		50	%		35	%		N/A			27	%

	Private Banks			Investment Advisors			Institutional Investors			Investment Managers			Investments In New Businesses			Total
	For the Six Months Ended June 30, 2010
Revenues	$	177,212		$	91,861		$	101,785		$	77,050		$	2,015		$	449,923
Expenses		156,211			55,703			52,956			50,155			5,400			320,425
Operating profit (loss)	$	21,001		$	36,158		$	48,829		$	26,895		$	(3,385	)	$	129,498
Operating margin		12	%		39	%		48	%		35	%		N/A			29	%

Reconciliation of Total Operating Profit Reported for Business Segments to Income from Operations in Consolidated Statements of Operations

	2011			2010
Total operating profit from segments above	$	64,144		$	66,745
Corporate overhead expenses		(10,720	)		(9,941	)
Noncontrolling interest reflected in segments		533			368
Income from operations	$	53,957		$	57,172

	2011			2010
Total operating profit from segments above	$	129,117		$	129,498
Corporate overhead expenses		(21,368	)		(19,658	)
Noncontrolling interest reflected in segments		805			677
Income from operations	$	108,554		$	110,517

Additional Information Pertaining to Business Segments

	Capital Expenditures					Depreciation
	2011			2010		2011		2010
Private Banks	$	6,783		$	7,559	$	3,962	$	4,044
Investment Advisors		2,296			2,673		556		592
Institutional Investors		251			555		268		291
Investment Managers		89			752		435		473
Investments in New Businesses		92			135		29		36
Total from business segments	$	9,511		$	11,674	$	5,250	$	5,436
Corporate Overhead		(24	)		157		141		148
	$	9,487		$	11,831	$	5,391	$	5,584

	Amortization
	2011		2010
Private Banks	$	4,608	$	3,765
Investment Advisors		1,551		1,364
Institutional Investors		196		301
Investment Managers		131		206
Investments in New Businesses		65		118
Total from business segments	$	6,551	$	5,754
Corporate Overhead		241		243
	$	6,792	$	5,997

	Capital Expenditures				Depreciation
	2011		2010		2011		2010
Private Banks	$	17,813	$	15,436	$	8,000	$	7,752
Investment Advisors		6,038		5,498		1,147		1,156
Institutional Investors		1,132		1,257		560		567
Investment Managers		1,873		1,871		938		943
Investments in New Businesses		304		291		59		73
Total from business segments	$	27,160	$	24,353	$	10,704	$	10,491
Corporate Overhead		350		426		298		299
	$	27,510	$	24,779	$	11,002	$	10,790

	Amortization
	2011		2010
Private Banks	$	8,837	$	7,466
Investment Advisors		2,969		2,704
Institutional Investors		363		605
Investment Managers		246		411
Investments in New Businesses		124		225
Total from business segments	$	12,539	$	11,411
Corporate Overhead		484		486
	$	13,023	$	11,897

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Investment in Unconsolidated Affiliate (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended				1 Months Ended		6 Months Ended	12 Months Ended		1 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010	Jul. 31, 2011	Dec. 31, 2010	Apr. 30, 2011 Bank of America [Member] LSV Employee Group II [Member]	Jun. 30, 2011 LSV [Member]	Jun. 30, 2011 LSV Employee Group [Member]	Dec. 31, 2006 LSV Employee Group [Member]	Jul. 31, 2011 LSV Employee Group [Member]	Jul. 31, 2011 LSV Employee Group II [Member]	Apr. 30, 2011 LSV Employee Group II [Member]	Jun. 30, 2011 LSV Employee Group II [Member]
Equity method investment, ownership percentage									41.00%
Total investment in LSV	$ 72,439			$ 72,439			$ 64,409
Investment in LSV in excess of the underlying equity in net assets	3,936			3,936
Partnership distribution payments received from LSV			21,242	50,760	44,359
Proportionate share in the earnings of LSV	29,530	23,519		58,479	47,593
Amount financed through new term loan								3,655
Acquisition of additional partnership interest											8.00%
Goodwill									3,062
Unpaid principal balance of term loan												1,298	3,472
Debt instrument, periodic payment, principal										8,793			183
Current debt obligation						0
Purchase partnership interest														$ 4,300
Maturity of term loan, years															four

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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	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Trading Securities [Member]
Beginning balance	$ 100,645	$ 120,714
Purchases	0	536
Issuances	0	0
Principal prepayments and settlements	(10,806)	(23,755)
Sales	(34,706)	(16,416)
Total gains or (losses) (realized/unrealized), included in earnings	4,920	21,262
Total gains or (losses) (realized/unrealized), included in other comprehensive income	0	0
Transfers in and out of Level 3	0	0
Ending balance	$ 60,053	$ 102,341

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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
Cash and cash equivalents	$ 442,311	$ 461,929	$ 442,311	$ 461,929	$ 496,292	$ 590,877
Capitalized software development costs	20,537	17,578	20,537	17,578
Capitalized software, weighted average remaining life, years			11.0
Amortization expense related to capitalized software			12,532	11,400
Capitalized software, accumulated amortization	103,479		103,479		90,947
Antidilutive employee stock options	7,675,000	10,422,000	7,606,000	16,210,000
Average exercise price of anti-dilutive employee stock options	$ 28.25	$ 24.87	$ 28.26	$ 23.46
Global Wealth Platform [Member]
Capitalized software, weighted average remaining life, years			11.0
Amortization expense related to capitalized software			12,249	11,117
Net book value of GWP	289,023		289,023
Capitalized software, accumulated amortization	74,400		74,400
Capitalized software development costs in-progress associated with future releases			12,161
Software development cost useful life, years			15
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Cash and cash equivalents	302,202		302,202		383,946
SEI Investments Distribution Co (SIDCO) [Member]
Restricted cash	1,000		1,000		0
SEI Investments (Europe) Limited [Member]
Restricted cash	$ 3,000		$ 3,000		$ 0	$ 3,000

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Income Taxes

6 Months Ended

Jun. 30, 2011

Income Taxes

Income Taxes

Note 11. Income Taxes

The gross liability for unrecognized tax benefits at June 30, 2011 and December 31, 2010 was $7,401 and $5,723, respectively, exclusive of interest and penalties, of which $6,350 and $4,870 would affect the effective tax rate if the Company were to recognize the tax benefit.

The Company classifies interest and penalties on unrecognized tax benefits as income tax expense. As of June 30, 2011 and December 31, 2010, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $702 and $689, respectively.

	June 30, 2011		December 31, 2010
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	7,401	$	5,723
Interest and penalties on unrecognized benefits		702		689
Total gross uncertain tax positions	$	8,103	$	6,412
Amount included in Current liabilities	$	554	$	767
Amount included in Other long-term liabilities		7,549		5,645
	$	8,103	$	6,412

The Company's effective tax rates were 34.7 percent and 37.8 percent for the three months ended June 30, 2011 and 2010, respectively. For the six months ended June 30, 2011 and 2010, the Company's tax rates were 36.0 percent and 37.8 percent, respectively. In December 2010, the research and development tax credit was reinstated for calendar year 2010 and 2011. The 2011 tax rate reflects a benefit for research and development tax credit whereas the 2010 tax rate did not reflect any benefit. Additionally, during the three months ended June 30, 2011, management determined the Company was eligible for the Domestic Production Activities Deduction. The effective rate in the three months ended June 30, 2011 reflects the benefit of this deduction for both 2011 and 2010.

The Company files income tax returns in the United States on a consolidated basis and in many U.S. state and foreign jurisdictions. The Company is subject to examination of income tax returns by the Internal Revenue Service (IRS) and other domestic and foreign tax authorities. 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.

The Company estimates it will recognize $554 of unrecognized tax benefits within the next twelve months due to the expiration of the statute of limitations and resolution of income tax audits. These unrecognized tax benefits are related to tax positions taken on certain federal, state, and foreign tax returns. However, the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. While it is reasonably possible that some issues under examination could be resolved in the next twelve months, based upon the current facts and circumstances, the Company cannot reasonably estimate the timing of such resolution or total range of potential changes as it relates to the current unrecognized tax benefits that are recorded as part of the Company's financial statements.

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Income Taxes (Interest and Penalties) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Income Taxes
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 7,401	$ 5,723
Interest and penalties on unrecognized benefits	702	689
Total gross uncertain tax positions	8,103	6,412
Amount included in Current liabilities	554	767
Amount included in Other long-term liabilities	$ 7,549	$ 5,645

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Composition of Certain Financial Statement Captions

6 Months Ended

Jun. 30, 2011

Composition of Certain Financial Statement Captions

Composition of Certain Financial Statement Captions

Note 4. Composition of Certain Financial Statement Captions

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2011			December 31, 2010
Trade receivables	$	41,419		$	34,528
Fees earned, not billed		101,355			93,506
Other receivables		7,519			9,651
		150,293			137,685
Less: Allowance for doubtful accounts		(868	)		(1,195	)
	$	149,425		$	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.

Property and Equipment

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

	June 30, 2011			December 31, 2010
Buildings	$	136,411		$	135,935
Equipment		67,266			63,902
Land		9,890			9,890
Purchased software		77,178			74,720
Furniture and fixtures		18,691			18,566
Leasehold improvements		4,700			4,250
Construction in progress		186			121
		314,322			307,384
Less: Accumulated depreciation and amortization		(177,779	)		(166,816	)
Property and Equipment, net	$	136,543		$	140,568

The Company recognized $11,002 and $10,790 in depreciation expense related to property and equipment for the six months ended June 30, 2011 and 2010, respectively.

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:

	June 30, 2011		December 31, 2010
Accrued employee compensation	$	26,547	$	43,747
Accrued employee benefits and other personnel		5,651		6,988
Accrued consulting, outsourcing and professional fees		20,576		16,390
Accrued brokerage fees		9,571		11,942
Accrued sub-advisory, distribution and other asset management fees		15,769		16,778
Accrued income taxes		0		2,077
Other accrued liabilities		23,221		23,488
Total accrued liabilities	$	101,335	$	121,410

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Summary of Significant Accounting Policies (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2011

Summary of Significant Accounting Policies

Calculation of Basic and Diluted Earnings per Share

	For the Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	53,603		184,585	$	.29
Dilutive effect of stock options		0		2,435
Diluted earnings per common share	$	53,603		187,020	$	.29
	For the Three Months Ended June 30, 2010
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	53,478		189,356	$	.28
Dilutive effect of stock options		0		2,144
Diluted earnings per common share	$	53,478		191,500	$	.28

	For the Six Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	111,331		185,186	$	.60
Dilutive effect of stock options		0		2,571
Diluted earnings per common share	$	111,331		187,757	$	.59
	For the Six Months Ended June 30, 2010
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	112,898		189,652	$	.60
Dilutive effect of stock options		0		1,629
Diluted earnings per common share	$	112,898		191,281	$	.59

Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities

	2011			2010
Net income	$	112,153		$	113,697
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		11,002			10,790
Amortization		13,023			11,897
Equity in earnings of unconsolidated affiliate		(58,479	)		(47,593	)
Distributions received from unconsolidated affiliate		50,760			23,117
Stock-based compensation		7,542			12,935
Provision for losses on receivables		(327	)		(893	)
Deferred income tax expense		(36	)		635
Net realized gains from investments		(5,330	)		(21,073	)
Change in other long-term liabilities		1,904			26
Change in other assets		(1,658	)		(457	)
Other		3,858			(3,493	)
Change in current asset and liabilities
Decrease (increase) in
Receivables from regulated investment companies		(1,953	)		(1,503	)
Receivables		(15,353	)		(14,324	)
Other current assets		(211	)		308
Increase (decrease) in
Accounts payable		(1,727	)		(1,774	)
Accrued liabilities		(21,081	)		(22,999	)
Deferred revenue		(1,247	)		(709	)
Total adjustments		(19,313	)		(55,110	)
Net cash provided by operating activities	$	92,840		$	58,587

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Fair Value Measurements (Narrative) (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Significant Unobservable Inputs (Level 3) [Member]
Financial liabilities		$ 0	$ 0
Transfers of financial assets between levels within the fair value hierarchy	$ 0

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2011

Income Taxes

Interest and Penalties

	June 30, 2011		December 31, 2010
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	7,401	$	5,723
Interest and penalties on unrecognized benefits		702		689
Total gross uncertain tax positions	$	8,103	$	6,412
Amount included in Current liabilities	$	554	$	767
Amount included in Other long-term liabilities		7,549		5,645
	$	8,103	$	6,412

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Consolidated Statements of Comprehensive Income (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Comprehensive Income
Net income	$ 54,113	$ 53,839	$ 112,153	$ 113,697
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	1,467	(5,071)	4,295	(4,294)
Unrealized holding gain on investments:
Unrealized holding gains during the period, net of income tax expense	816	690	646	690
Less: reclassification adjustment for (gains) losses realized in net income, net of income tax (expense) benefit	28	4	(131)	31
Unrealized holding gain on investments, total	788	694	515	721
Total other comprehensive income (loss), net of tax	2,255	(4,377)	4,810	(3,573)
Comprehensive income	56,368	49,462	116,963	110,124
Comprehensive (income) loss attributable to noncontrolling interest	(1,015)	926	(1,747)	(5)
Comprehensive income attributable to SEI Investments Company	$ 55,353	$ 50,388	$ 115,216	$ 110,119

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Investment in Unconsolidated Affiliate (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2011

Investment in Unconsolidated Affiliate

Condensed Statement of Operations of LSV

	Three Months Ended June 30,
	2011		2010
Revenues	$	81,748	$	65,011
Net income		72,018		56,641

	Six Months Ended June 30,
	2011		2010
Revenues	$	161,150	$	131,020
Net income		141,964		114,613

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Marketable Securities (Trading Securities) (Details) (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Trading Securities, Cost	$ 155,526	$ 233,075
Trading Securities, Gross Unrealized Gains	2,081	1,900
Trading Securities, Gross Unrealized Losses	(93,424)	(130,381)
Trading Securities, Fair Value	64,183	104,594
SIV Securities [Member]
Trading Securities, Cost	153,477	231,026
Trading Securities, Gross Unrealized Gains	0	0
Trading Securities, Gross Unrealized Losses	(93,424)	(130,381)
Trading Securities, Fair Value	60,053	100,645
LSV-Sponsored Mutual Funds [Member]
Trading Securities, Cost	2,049	2,049
Trading Securities, Gross Unrealized Gains	2,081	1,900
Trading Securities, Gross Unrealized Losses	0	0
Trading Securities, Fair Value	$ 4,130	$ 3,949

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Jun. 30, 2010

Fair Value Measurements

Fair Value of Certain Financial Assets and Liabilities

	At June 30, 2011
	Fair Value Measurements at Reporting Date Using
	Total		Active Markets for  Identical Assets (Level 1)		Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Equity available-for-sale securities	$	9,526	$	9,526	$	0	$	0
Fixed income available-for-sale securities		64,770		0		64,770		0
Fixed income securities owned		21,032		0		21,032		0
Trading securities issued by SIVs		60,053		0		0		60,053
Other trading securities		4,130		4,130		0		0
	$	159,511	$	13,656	$	85,802	$	60,053

	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 issued by SIVs		100,645		0		0		100,645
Other trading securities		3,949		3,949		0		0
	$	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 Issued by SIVs
Balance, January 1, 2011	$	100,645
Purchases		0
Issuances		0
Principal prepayments and settlements		(10,806	)
Sales		(34,706	)
Total gains or (losses) (realized/unrealized):
Included in earnings		4,920
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance June 30, 2011	$	60,053

	Trading Securities Issued by SIVs
Balance, January 1, 2010	$	120,714
Purchases		536
Issuances		0
Principal prepayments and settlements		(23,755	)
Sales		(16,416	)
Total gains or (losses) (realized/unrealized):
Included in earnings		21,262
Included in other comprehensive income		0
Transfers in and out of Level 3		0
Balance June 30, 2010	$	102,341

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Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 112,153		$ 113,697
Adjustments to reconcile net income to net cash provided by operating activities	(19,313)		(55,110)
Net cash provided by operating activities	92,840		58,587
Cash flows from investing activities:
Additions to restricted cash	0		(430)
Additions to property and equipment	(6,973)		(7,201)
Additions to capitalized software	(20,537)		(17,578)
Purchase of marketable securities	(36,596)		(24,769)
Prepayments and maturities of marketable securities	23,134		28,297
Sale of marketable securities	37,408		23,069
Sale of other investments	4,905		0
LSV and LSV Employee Group cash balances, net	0	[1]	(37,083)	[1]
Net cash provided by (used in) investing activities	1,341		(35,695)
Cash flows from financing activities:
Payments on long-term debt	(55,000)		(83,000)
Purchase and retirement of common stock	(94,137)		(47,643)
Proceeds from issuance of common stock	20,845		13,821
Tax benefit on stock options exercised	2,171		993
Payment of dividends	(22,041)		(36,011)
Net cash used in financing activities	(148,162)		(151,840)
Net decrease in cash and cash equivalents	(53,981)		(128,948)
Cash and cash equivalents, beginning of period	496,292		590,877
Cash and cash equivalents, end of period	$ 442,311		$ 461,929

[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.

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Accumulated Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2011

Accumulated Comprehensive Income (Loss)

Accumulated Comprehensive Income (Loss)

Note 9. Accumulated Comprehensive Income (Loss)

Accumulated other comprehensive income (loss), net of tax, consists of:

	Foreign Currency Translation Adjustments		Unrealized Holding  Gains (Losses) on Investments		Accumulated Other Comprehensive Income (Loss)
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 income for the six months ended June 30, 2011	$	4,295		$	515	$	4,810
Less: Total comprehensive income attributable to noncontrolling interest for the six months ended June 30, 2011		(925	)		0		(925	)
Total comprehensive income attributable to SEI Investments Company for the six months ended June 30, 2011	$	3,370		$	515	$	3,885
Total accumulated comprehensive income at June 30, 2011	$	5,447		$	1,854	$	7,301
Less: Total accumulated comprehensive income attributable to noncontrolling interest at June 30, 2011		(259	)		0		(259	)
Total accumulated comprehensive income attributable to SEI Investments Company at June 30, 2011	$	5,188		$	1,854	$	7,042

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Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 7,401,000		$ 7,401,000		$ 5,723,000
Unrecognized tax benefits that would impact effective tax rate	6,350,000		6,350,000		4,870,000
Accrued interest and penalties related to tax positions	702,000		702,000		689,000
Effective tax rates	34.70%	37.80%	36.00%	37.80%
Unrecognized tax benefits within the next 12 months	$ 554		$ 554

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Investment in Unconsolidated Affiliate (Condensed Statement of Operations of LSV) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues	$ 237,760	$ 228,388	$ 470,253	$ 449,923
Net income	53,603	53,478	111,331	112,898
Investment in Unconsolidated Affiliate [Member]
Revenues	81,748	65,011	161,150	131,020
Net income	$ 72,018	$ 56,641	$ 141,964	$ 114,613

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Summary of Significant Accounting Policies (Policy)

6 Months Ended

Jun. 30, 2011

Summary of Significant Accounting Policies

Nature of Operations

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, fund processing, and investment management business outsourcing 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 utilize the Company's proprietary software systems to track investment activities in multiple types of investment accounts, including personal trust, corporate trust, institutional trust, and non-trust investment accounts, thereby allowing banks and trust companies to outsource trust and investment related activities. 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.

The fund processing solution offers a full range of administration and distribution support services to mutual funds, collective trust funds, single-manager hedge funds, funds of hedge funds, private equity funds and other types of investment funds. Administrative services include fund accounting, trustee and custodial support, legal support, transfer agency and shareholder servicing. Distribution support services range from market and industry insight and analysis to identifying distribution opportunities. Revenues from fund processing solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

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.

Basis of Presentation

Basis of Presentation

The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company's Annual Report on Form 10-K has been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of June 30, 2011, the results of operations for the three and six months ended June 30, 2011 and 2010, and cash flows for the six month periods ended June 30, 2011 and 2010. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2010.

There have been no significant changes in significant accounting policies during the six months ended June 30, 2011 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2010.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents includes $302,202 and $383,946 at June 30, 2011 and December 31, 2010, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds.

Restricted Cash

Restricted Cash

Restricted cash includes $3,000 at June 30, 2011 and December 31, 2010 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $1,000 at June 30, 2011 and December 31, 2010 segregated in special reserve accounts for the benefit of customers of the Company's broker-dealer subsidiary, SEI Investments Distribution Co. (SIDCO), in accordance with certain rules established by the Securities and Exchange Commission for broker-dealers.

Capitalized Software

Capitalized Software

The Company capitalized $20,537 and $17,578 of software development costs during the six months ended June 30, 2011 and 2010, respectively. As of June 30, 2011, capitalized software placed into service included on the accompanying Consolidated Balance Sheet had a weighted average remaining life of approximately 11.0 years. Amortization expense related to capitalized software was $12,532 and $11,400 during the six months ended June 30, 2011 and 2010, respectively.

Software development costs capitalized during the six months ended June 30, 2011 and 2010 relates to the continued development of the Global Wealth Platform (GWP). As of June 30, 2011, the net book value of GWP was $289,023 (net of accumulated amortization of $74,400), including $12,161 of capitalized software development costs in-progress associated with future releases. GWP has an estimated useful life of 15 years and a weighted average remaining life of 11.0 years. Amortization expense for GWP was $12,249 and $11,117 during the six months ended June 30, 2011 and 2010, respectively.

Earnings per Share

Earnings per Share

The calculations of basic and diluted earnings per share for the three months ended June 30, 2011 and 2010 are:

	For the Three Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	53,603		184,585	$	.29
Dilutive effect of stock options		0		2,435
Diluted earnings per common share	$	53,603		187,020	$	.29
	For the Three Months Ended June 30, 2010
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	53,478		189,356	$	.28
Dilutive effect of stock options		0		2,144
Diluted earnings per common share	$	53,478		191,500	$	.28

Employee stock options to purchase 7,675,000 and 10,422,000 shares of common stock, with an average exercise price of $28.25 and $24.87, were outstanding during the three months ended June 30, 2011 and 2010, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

The calculations of basic and diluted earnings per share for the six months ended June 30, 2011 and 2010 are:

	For the Six Months Ended June 30, 2011
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	111,331		185,186	$	.60
Dilutive effect of stock options		0		2,571
Diluted earnings per common share	$	111,331		187,757	$	.59
	For the Six Months Ended June 30, 2010
	Income (Numerator)		Shares (Denominator)		Per Share Amount
Basic earnings per common share	$	112,898		189,652	$	.60
Dilutive effect of stock options		0		1,629
Diluted earnings per common share	$	112,898		191,281	$	.59

Employee stock options to purchase 7,606,000 and 16,210,000 shares of common stock, with an average exercise price of $28.26 and $23.46, were outstanding during the six months ended June 30, 2011 and 2010, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.

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 is currently evaluating the requirements of the guidance and has not yet determined its impact on the Company's 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 adoption of this guidance may impact the presentation of the Company's consolidated financial statements, but it will not change the items that must be reported in other comprehensive income or when an item of other comprehensive income must be reclassified to net income. The guidance is effective for interim and annual periods beginning after December 15, 2011 and will require retrospective application for all periods presented.

Statements of Cash Flows

Statements of Cash Flows

For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the six months ended June 30:

	2011			2010
Net income	$	112,153		$	113,697
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		11,002			10,790
Amortization		13,023			11,897
Equity in earnings of unconsolidated affiliate		(58,479	)		(47,593	)
Distributions received from unconsolidated affiliate		50,760			23,117
Stock-based compensation		7,542			12,935
Provision for losses on receivables		(327	)		(893	)
Deferred income tax expense		(36	)		635
Net realized gains from investments		(5,330	)		(21,073	)
Change in other long-term liabilities		1,904			26
Change in other assets		(1,658	)		(457	)
Other		3,858			(3,493	)
Change in current asset and liabilities
Decrease (increase) in
Receivables from regulated investment companies		(1,953	)		(1,503	)
Receivables		(15,353	)		(14,324	)
Other current assets		(211	)		308
Increase (decrease) in
Accounts payable		(1,727	)		(1,774	)
Accrued liabilities		(21,081	)		(22,999	)
Deferred revenue		(1,247	)		(709	)
Total adjustments		(19,313	)		(55,110	)
Net cash provided by operating activities	$	92,840		$	58,587

As previously disclosed in the Company's Quarterly Report on Form 10-Q for the quarter ended September 30, 2010, during the three months ended September 30, 2010, the Company identified that it had incorrectly classified certain accounts payable related to the purchase of computer software during the three months ended June 30, 2010 as Additions to property and equipment in the Cash flows from investing activities section on the consolidated statement of cash flows in the six months ended June 30, 2010. The effect of the misclassification resulted in Cash flows provided by operating activities and Cash flows used in investing activities being overstated by $7,102 for the six months ended June 30, 2010. The Company has revised its consolidated statement of cash flows for the six months ended June 30, 2010 to appropriately classify this amount to the Cash flows from operating activities. This misclassification had no effect on the consolidated balances sheets, consolidated statements of operations or consolidated statements of comprehensive income.

Reclassifications

Reclassifications

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

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Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 442,311	$ 496,292
Restricted cash	4,000	4,000
Receivables from regulated investment companies	31,235	29,282
Receivables, net of allowance for doubtful accounts of $868 and $1,195 (Note 4)	149,425	136,490
Deferred income taxes	651	1,387
Securities owned (Note 6)	21,032	0
Other current assets	16,479	16,268
Total Current Assets	665,133	683,719
Property and Equipment, net of accumulated depreciation and amortization of $177,779 and $166,816 (Note 4)	136,543	140,568
Capitalized Software, net of accumulated amortization of $103,479 and $90,947	302,337	294,332
Investments Available for Sale (Note 6)	74,296	74,770
Trading Securities (Note 6)	64,183	104,594
Investment in Unconsolidated Affiliate (Note 2)	72,439	64,409
Other Assets, net	15,874	14,831
Total Assets	1,330,805	1,377,223
Current Liabilities:
Accounts payable	2,855	4,582
Accrued liabilities (Note 4)	101,335	121,410
Deferred revenue	361	1,608
Total Current Liabilities	104,551	127,600
Long-term Debt (Note 7)	40,000	95,000
Deferred Income Taxes	91,643	92,253
Other Long-term Liabilities (Note 11)	7,549	5,645
Total Liabilities	243,743	320,498
Commitments and Contingencies (Note 12)
SEI Investments Company shareholders' equity:
Common stock, $.01 par value, 750,000 shares authorized; 183,175 and 186,141 shares issued and outstanding	1,832	1,861
Capital in excess of par value	585,619	565,393
Retained earnings	475,667	471,159
Accumulated other comprehensive income, net	7,042	3,157
Total SEI Investments Company shareholders' equity	1,070,160	1,041,570
Noncontrolling interest	16,902	15,155
Total Equity	1,087,062	1,056,725
Total Liabilities and Equity	$ 1,330,805	$ 1,377,223

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Composition of Certain Financial Statement Captions (Receivables) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Composition of Certain Financial Statement Captions
Trade receivables	$ 41,419	$ 34,528
Fees earned, not billed	101,355	93,506
Other receivables	7,519	9,651
Gross receivables	150,293	137,685
Less: Allowance for doubtful accounts	(868)	(1,195)
Net receivables	$ 149,425	$ 136,490

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Shareholder's Equity (Reconciliation of Non-Controlling Interest on the Consolidated Balance Sheet) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Beginning balance			$ 15,155
Net income attributable to noncontrolling interest	510	361	822	799
Foreign currency translation adjustments	1,467	(5,071)	4,295	(4,294)
Ending balance	16,902		16,902
Noncontrolling Interest [Member]
Beginning balance			15,155	121,895
Net income attributable to noncontrolling interest			822	799
Foreign currency translation adjustments			925	(794)
Ending balance	16,902	12,842	16,902	12,842
LSV [Member]
Deconsolidation				(65,522)
LSV Employee Group [Member]
Deconsolidation				$ (43,536)

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Lines of Credit (Details) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011 USD ($)	Jun. 30, 2011 Canadian Subsidiary [Member] CAD
Credit agreement, years	five
Credit facility	$ 300,000	2,000
Credit facility, expiration date	July 2012
Credit facility interest accrued, percentage above LIBOR	0.45%
Credit facility, commitment fee per annum on daily unused portion, percent	0.09%
Aggregate amount that may increase under credit facility	100,000
Credit facility, principal payments	55,000
Credit facility, outstanding balance	$ 40,000	0

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Shareholders' Equity (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	May 25, 2011	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Unrecognized compensation cost		$ 44,986,000		$ 44,986,000
Total intrinsic value of options exercisable		63,155,000		63,155,000
Change in management's estimate for achievement of vesting targets				0	2,492,000
Total intrinsic value of options exercised				8,205,000	4,921,000
Market value of the Company's common stock				22.51
Weighted average exercise price of the options exercisable		$ 17.66		$ 17.66
Total options that were outstanding		26,349,000		26,349,000
Shares purchased, cost				95,144,000
Shares purchased and retired				4,215,000
Authorized aggregate repurchase value of common stock				112,298,000
Cash dividends				$ 22,041,000	$ 18,890,000
Cash dividends declared, per share	$ 0.12	$ 0.12	$ 0.10	$ 0.12	$ 0.10
Cash dividends declared, date declared				May 25, 2011
Cash dividends declared, date paid				Jun. 28, 2011
Cash dividends declared, date of record				Jun. 20, 2011
2007 Plan [Member]
Number of active equity compensation plans				1
Options available for grant		20,000,000		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%
1998 Plan [Member]
Options available for grant		0		0

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Business Segment Information (Additional Information Pertaining to Business Segments) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Capital Expenditures	$ 9,487	$ 11,831	$ 27,510	$ 24,779
Depreciation	5,391	5,584	11,002	10,790
Amortization	6,792	5,997	13,023	11,897
Private Banks [Member]
Capital Expenditures	6,783	7,559	17,813	15,436
Depreciation	3,962	4,044	8,000	7,752
Amortization	4,608	3,765	8,837	7,466
Investment Advisors [Member]
Capital Expenditures	2,296	2,673	6,038	5,498
Depreciation	556	592	1,147	1,156
Amortization	1,551	1,364	2,969	2,704
Institutional Investors [Member]
Capital Expenditures	251	555	1,132	1,257
Depreciation	268	291	560	567
Amortization	196	301	363	605
Investment Managers [Member]
Capital Expenditures	89	752	1,873	1,871
Depreciation	435	473	938	943
Amortization	131	206	246	411
Investments in New Businesses [Member]
Capital Expenditures	92	135	304	291
Depreciation	29	36	59	73
Amortization	65	118	124	225
Total from Business Segments [Member]
Capital Expenditures	9,511	11,674	27,160	24,353
Depreciation	5,250	5,436	10,704	10,491
Amortization	6,551	5,754	12,539	11,411
Corporate Overhead [Member]
Capital Expenditures	(24)	157	350	426
Depreciation	141	148	298	299
Amortization	$ 241	$ 243	$ 484	$ 486

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Composition of Certain Financial Statement Captions (Property and Equipment) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Composition of Certain Financial Statement Captions
Buildings	$ 136,411		$ 136,411		$ 135,935
Equipment	67,266		67,266		63,902
Land	9,890		9,890		9,890
Purchased software	77,178		77,178		74,720
Furniture and fixtures	18,691		18,691		18,566
Leasehold improvements	4,700		4,700		4,250
Construction in progress	186		186		121
Property and Equipment, gross	314,322		314,322		307,384
Less: Accumulated depreciation and amortization	(177,779)		(177,779)		(166,816)
Property and Equipment, net	136,543		136,543		140,568
Depreciation expense	$ 5,391	$ 5,584	$ 11,002	$ 10,790