Sei Investments Co (SEIC) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

128,651,013Shares Outstanding

980,387Shares held by institutions

$77,470,181Value of institutional holdings

66.44%Institutional ownership %

1.90%Shares Changed QoQ

522No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

According to SEC filings for the period ending December 2025, Sei Investments Co (NASDAQ:SEIC) is held by 522 institutional firms.

Institutional ownership in Sei Investments edged down to 66.4% in December 2025, compared to 68.8% in September 2025.
Quarterly data indicates a 1.90% shift in institutional share volume, and the annual owner count reflects a decrease of 2.25%.
A review of institutional activity for Sei Investments shows 260 of 522 filers increasing their positions, while 181 reduced their stake, and 81 remained unchanged.
This class of investors increased its holdings in Sei Investments to 85.48Mn shares for the 13F-cycle ending December 2025, up by 1.59Mn shares quarter on quarter, and down 5.02Mn shares year over year.
The top institutional stake in Sei Investments as of December 31, 2025 belongs to VANGUARD GROUP INC, which owns 11.07Mn shares, or 8.61% of the company.
Among the most significant buyers of Sei Investments during December 2025 were NORGES BANK (652.87K), Clark Capital Management Group, Inc. (619.32K), PFA Pension, Forsikringsaktieselskab (519.31K), BlackRock, Inc. (375.24K), LORD, ABBETT & CO. LLC (308.99K).
Leading sellers of Sei Investments stock in December 2025 included MORGAN STANLEY (518.56K), UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC (429.62K), ROYAL BANK OF CANADA (339.91K), MILLENNIUM MANAGEMENT LLC (284.05K), STATE STREET CORP (253.52K).
The top 10 institutional holders of Sei Investments for the quarter ending December 2025 included VANGUARD GROUP INC (11.07Mn), BlackRock, Inc. (9.64Mn), LOOMIS SAYLES & CO L P (8.74Mn), MORGAN STANLEY (5.08Mn), STATE STREET CORP (4.28Mn), BANK OF AMERICA CORP /DE/ (2.92Mn), GEODE CAPITAL MANAGEMENT, LLC (2.89Mn), LORD, ABBETT & CO. LLC (1.92Mn), Beutel, Goodman & Co Ltd. (1.88Mn), DIMENSIONAL FUND ADVISORS LP (1.85Mn).

522 Institutional Holders

980,387 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
VANGUARD GROUP INC	31 Dec, 2025	11,071,365	-189,226	-1.68%	$908,073,358.00
BlackRock, Inc.	31 Dec, 2025	9,637,840	375,238	4.05%	$790,495,640.00
LOOMIS SAYLES & CO L P	31 Dec, 2025	8,744,634	-231,415	-2.58%	$717,234,871.00
MORGAN STANLEY	31 Dec, 2025	5,075,178	-518,564	-9.27%	$416,266,280.00
STATE STREET CORP	31 Dec, 2025	4,283,065	-253,517	-5.59%	$353,493,250.00
BANK OF AMERICA CORP /DE/	31 Dec, 2025	2,922,323	-198,744	-6.37%	$239,688,911.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	2,894,317	109,974	3.95%	$237,420,996.00
LORD, ABBETT & CO. LLC	31 Dec, 2025	1,917,370	308,988	19.21%	$157,263.00
Beutel, Goodman & Co Ltd.	31 Dec, 2025	1,882,427	-140,523	-6.95%	$154,396.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	1,853,144	-9,908	-0.53%	$152,003,225.00
FIRST TRUST ADVISORS LP	31 Dec, 2025	1,800,938	75,919	4.40%	$147,712,960.00
CAISSE DE DEPOT ET PLACEMENT DU QUEBEC	31 Dec, 2025	1,380,997	37,240	2.77%	$113,269,374.00
FMR LLC	31 Dec, 2025	1,343,174	-6,456	-0.48%	$110,167,174.00
Boston Trust Walden Corp	31 Dec, 2025	1,084,790	-20,619	-1.87%	$88,974,448.00
Bank of New York Mellon Corp	31 Dec, 2025	990,651	-23,260	-2.29%	$81,253,190.00
ROYCE & ASSOCIATES LP	31 Dec, 2025	906,339	2,756	0.31%	$74,337,925.00
NORTHERN TRUST CORP	31 Dec, 2025	891,476	-31,144	-3.38%	$73,118,862.00
AMERIPRISE FINANCIAL INC	31 Dec, 2025	821,461	5,767	0.71%	$67,377,717.00
FRANKLIN RESOURCES INC	31 Dec, 2025	818,694	180,208	28.22%	$67,149,282.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	664,349	1,891	0.29%	$54,489,905.00

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