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SEI Investments (NASDAQ: SEIC) reports $108.45B in 13F holdings

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(Neutral)
Filing Sentiment
(Neutral)
Form Type
13F-HR

Rhea-AI Filing Summary

SEI Investments Company filed a Form 13F Combination Report reporting holdings with an aggregate Form 13F Information Table value of $108,447,233,183. The report lists 6,108 information table entries and identifies 3 other included managers. The filing was signed by Michael N. Peterson on 05-13-2026.

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Form 13F Information Table Value Total $108,447,233,183 Form 13F Information Table
Form 13F Information Table Entry Total 6,108 entries Form 13F Information Table
Number of Other Included Managers 3 Form 13F Summary Page
Signing Date 05-13-2026 Signature block
Form 13F regulatory
"The institutional investment manager filing this report"
A Form 13F is a quarterly filing that large investment managers must submit to disclose their holdings in publicly traded stocks and certain other securities. It acts like a peek into the portfolios of big investors, helping other market participants see what large players are buying or selling and offering clues about investment trends, crowded trades, and potential market impact.
13F Combination Report regulatory
"13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report"
Sole Voting Authority financial
"reported as "Sole Voting Authority.""
manager of managers regulatory
"may act as a "manager of managers" whereby each retain, subject to SIMC's and SEI Canada's oversight"
An investment approach in which a primary manager hires and oversees several specialist managers, each responsible for a portion of the portfolio—like a conductor bringing together soloists or a general contractor coordinating trades on a building. It matters to investors because it can add diversification and access to specialized skills while concentrating decision-making and monitoring with the lead manager, but can also increase fees and complexity compared with a single-manager fund.
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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
Estimated average burden
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

Source: View Original Filing on SEC EDGAR

FAQ

What does SEI's Form 13F filing (SEIC) disclose?

It discloses aggregated 13F holdings totaling $108,447,233,183 across 6,108 entries. The filing is a Combination Report and lists other included managers and signing authority, providing a snapshot of reported institutional positions as of the reporting period.

How many managers are included with SEI in this 13F filing?

The filing identifies 3 other included managers. The report lists SEI Investments Management Corp, SEI Trust Co, and SEI Investments Canada Co as the other managers included in this submission.

Who signed the SEI 13F and when was it signed?

Michael N. Peterson, Executive Vice President, signed the report on 05-13-2026. The signature block affirms authorization to submit the Form 13F on behalf of the reporting manager.

What is a "13F Combination Report" in SEI's filing?

A 13F Combination Report indicates some holdings are reported here and some by other managers. SEI marked this option and provided a list of other reporting managers and subsidiaries whose holdings relate to the overall reporting obligation.