SEC FORM 13F-HR

The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE

OMB APPROVAL

OMB Number:			3235-0006
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hours per response:			23.8

Report for the Calendar Year or Quarter Ended:

03-31-2026

Check here if Amendment		Amendment Number:
This Amendment (Check only one.):		is a restatement.
		adds new holdings entries.

Institutional Investment Manager Filing this Report:
Name:	SEI INVESTMENTS CO
Address:	1 FREEDOM VALLEY DRIVE

	OAKS, PA 19456-1100
Form 13F File Number:	028-16454
CRD Number (if applicable):
SEC File Number (if applicable):

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:
Name:	Michael N. Peterson
Title:	Executive Vice President
Phone:	610-676-1000
Signature, Place, and Date of Signing:
Michael N. Peterson		Oaks, PA	05-13-2026
[Signature]		[City, State]	[Date]
SEI Investments Company (SEI) is the parent holding company of certain institutional investment managers, as defined by Section 13(f) of the Securities Exchange Act of 1934, as amended (the "Act"). For purposes of the reporting requirements under Section 13(f) of the Act, and the rules promulgated thereunder, SEI does not exercise, and therefore disclaims, investment discretion with respect to any Section 13(f) securities positions over which its investment operating subsidiaries exercise such discretion. To the extent, however, that SEI's ownership interest in such subsidiaries may nevertheless give rise to a Form 13F obligation for SEI, the information required by Form 13F is reported herein on behalf of the following subsidiaries: SEI Investments Management Corporation ("SIMC"), SEI Trust Company and SEI Investments Canada Company (SEI Canada). Voting authority with respect to the Section 13(f) securities reported herein resides with and is exercised by SEI's operating subsidiaries, unless otherwise indicated. Although SEI has not been delegated voting authority over such Section 13(f) securities, and disclaims such voting authority, pursuant to instruction 12b.viii of Form 13F, and for that purpose only, such Section 13(f) securities are reported as "Sole Voting Authority." SIMC and SEI Canada each serve as an investment adviser to a number of pooled investment vehicles, which may include mutual funds, hedge funds, private equity funds, collective investment trusts and offshore investment funds (together, the "Pooled Investment Vehicles"). In addition, SIMC sponsor and may serve as adviser to, separately managed account programs (SMA Programs) . SIMC and SEI Canada may act as a "manager of managers" whereby each retain, subject to SIMC's and SEI Canada's oversight, respectively, sub-advisers to buy and sell securities on behalf of such Pooled Investment Vehicles and SMA Programs. To the extent that SIMC's and SEI Canada's role as a manager of managers could give rise to a Form 13F obligation, SIMC or SEI Canada has instructed its sub-advisers to file a Form 13F with respect to such securities and has included such sub-advisers in the "list of other managers reporting for this manager" below.

Report Type (Check only one.):
	13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)
	13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)
X	13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)

List of Other Managers Reporting for this Manager: [If there are no entries in this list, omit this section.]
	Name	Form 13F File No.	CRD No. (if applicable)	SEC File No. (if applicable)	CIK
	ACADIAN ASSET MANAGEMENT LLC	028-05990			0000916542
	ALLIANCEBERNSTEIN L.P.	028-10562			0001109448
	AQR CAPITAL MANAGEMENT LLC	028-10120			0001167557
	Arcus Capital Partners, LLC	028-17137			0001651960
	ArrowMark Colorado Holdings LLC	028-13791			0001483859
	AXIOM INVESTORS LLC /DE	028-05615			0001109147
	Beutel, Goodman & Co Ltd.	028-11939			0001361974
	BRIGADE CAPITAL MANAGEMENT, LP	028-12820			0001421306
	CAUSEWAY CAPITAL MANAGEMENT LLC	028-11728			0001165797
	Coho Partners, Ltd.	028-11563			0001350585
	Copeland Capital Management, LLC	028-14668			0001541743
	Fiera Capital Corp	028-14036			0001505817
	GREAT LAKES ADVISORS, LLC	028-05229			0001078013
	Hillsdale Investment Management Inc.	028-11957			0001368465
	INTECH INVESTMENT MANAGEMENT LLC	028-04211			0001086318
	J O HAMBRO CAPITAL MANAGEMENT LTD	028-14777			0000940755
	KETTLE HILL CAPITAL MANAGEMENT, LLC	028-17689			0001387369
	LMCG INVESTMENTS, LLC	028-13608			0001470944
	LSV ASSET MANAGEMENT	028-06580			0001050470
	Macquarie Investment Management LTD	028-13124			0001435053
	MANULIFE INVESTMENT MANAGEMENT (US) LLC	028-03673			0001034182
	MAR VISTA INVESTMENT PARTNERS LLC	028-13243			0001419999
	MARATHON ASSET MANAGEMENT LP	028-10682			0001279913
	MARTINGALE ASSET MANAGEMENT L P	028-04632			0000936944
	Neuberger Berman Group LLC	028-13573			0001465109
	GOLDMAN SACHS GROUP INC	028-04981			0000886982
	PACIFIC INVESTMENT MANAGEMENT CO LLC	028-10952			0001163368
	PANAGORA ASSET MANAGEMENT INC	028-03042			0000883677
	PARAMETRIC PORTFOLIO ASSOCIATES LLC	028-04558			0000932859
	Poplar Forest Capital LLC	028-13350			0001454949
	QS Investors, LLC	028-14009			0001501436
	Qtron Investments LLC	028-19339			0001768099
	RAMIUS ADVISORS LLC	028-10674			0001275893
	RWC Asset Management LLP	028-14481			0001520478
	SCHAFER CULLEN CAPITAL MANAGEMENT INC	028-04691			0001056593
	SSGA FUNDS MANAGEMENT INC	028-11338			0001257442
	WCM INVESTMENT MANAGEMENT, LLC	028-07104			0001061186
	Allspring Global Investments, LLC	028-04413			0001075869
	DIAMOND HILL CAPITAL MANAGEMENT INC	028-10648			0001217541
	Stone Harbor Investment Partners LP	028-14178			0001508123
	Leeward Investments, LLC - MA	028-22464			0001923173
	Alphinity Investment Management Pty Ltd	028-18430			0001731012
	BARINGS LLC	028-00060			0000009015
	BAILLIE GIFFORD & CO	028-04825			0001088875
	Aikya Investment Management Ltd	028-23502			0002005403
	Benefit Street Partners LLC	028-18146			0001543160
	Blackcrane Capital, LLC	028-18913			0001720745
	BLACKROCK ADVISORS LLC	028-04295			0001086364
	BlackRock Institutional Trust Company, N.A.	028-03946			0000913414
	Fondsmaeglerselskabet Maj Invest A/S	028-18845			0001746408
	J.P. Morgan Investment Management Inc.	028-11937			0001363391
	Spectrum Asset Management, Inc.	028-11300			0001318293
	Brown Advisory LLC	028-05775			0001114667

Form 13F Summary Page
	Report Summary:
	Number of Other Included Managers:	3
	Form 13F Information Table Entry Total:	6,108
	Form 13F Information Table Value Total:	108,447,233,183
		(round to nearest dollar)

List of Other Included Managers:
Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.
[If there are no entries in this list, state “NONE” and omit the column headings and list entries.]
	No.	Name	Form 13F File No.	CRD No. (if applicable)	SEC File No. (if applicable)	CIK
	1	SEI INVESTMENTS MANAGEMENT CORP	028-16475	000105146	801-24593	0000907692
	2	SEI TRUST CO	028-10297			0001204692
	3	SEI Investments Canada Co	028-16449			0001633036

SEC Form 13F-HR filed by SEI Investments Company