Sei Investments Co (SEIC) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

126,325,000Shares Outstanding

89,038,480Shares held by institutions

$8,212,909,395Value of institutional holdings

70.48%Institutional ownership %

-1.65%Shares Changed QoQ

547No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Sei Investments Co (NASDAQ:SEIC) has 546 institutional investors that have filed 13F reports for the period ending December 2025.

Collectively, these holders controlled 70.0% of Sei Investments's outstanding shares in December 2025, down from 73.1% in September 2025.
Their total shares held in SEIC decreased -2.02% from the prior quarter, while the number of investors in Sei Investments increased 2.44% year over year.
Activity in SEIC broke down as 271 buyers, 191 sellers, and 84 unchanged among 546 total holders.
Combined, these investors held 88.38Mn shares in SEIC for December 2025, down by 1.83Mn shares quarter on quarter, and down 10.04Mn shares year over year.
Boston Trust Walden Corp leads ownership in SEIC with 1.04Mn shares as of December 31, 2025, equal to 0.82% of outstanding shares.
Top purchasers of SEIC stock for the quarter ending December 2025 included BI Asset Management Fondsmaeglerselskab A/S (70.45K), Robeco Institutional Asset Management B.V. (16.99K), OP Asset Management Ltd (13.08K), WEALTH ENHANCEMENT ADVISORY SERVICES, LLC (13.07K), Vest Financial, LLC (11.75K).
The largest sellers of Sei Investments for the quarter ending December 2025 were Boston Trust Walden Corp (45.06K), Janney Montgomery Scott LLC (16.0K), Retirement Systems of Alabama (15.26K), Thrive Wealth Management, LLC (4.39K), Sterling Capital Management LLC (2.54K).
Business Quant data shows the 10 biggest positions in Sei Investments as of December 2025 are held by Boston Trust Walden Corp (1.04Mn), Retirement Systems of Alabama (272.68K), Janney Montgomery Scott LLC (132.91K), Robeco Institutional Asset Management B.V. (104.77K), Vest Financial, LLC (82.57K), Thrive Wealth Management, LLC (76.78K), BI Asset Management Fondsmaeglerselskab A/S (70.45K), Inspire Investing, LLC (43.66K), Wealth Alliance Advisory Group, LLC (37.5K), Third View Private Wealth, LLC (36.51K).

551 Institutional Holders

89,038,480 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	-3,319,811	-53.18%	$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
Invesco Ltd.	31 Dec, 2025	1,732,384	861	0.05%	$142,090,136.00
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

1 - 20 of 551

Research Tools