Sei Investments SEIC Institutional Ownership

NASDAQ SEIC

$109.53 +1.93 (+1.79%)

At close: Aug 21, 2026 · 4:00 PM EDT

Institutions by Trading Activity

555 Institutions

Increased 289 52.1%

Unchanged 90 16.2%

Reduced 176 31.7%

Ownership Statistics

13F · as of 31 Mar, 2026

Institutional Ownership

74.05%

▲+2.26 pp QoQ

Shares Held by Institutions

90.08Mn

of 121.66Mn outstanding

▲+18.70% QoQ

Shares Outstanding

121.66Mn

31.58Mn held outside 13F filers

Institutional Investors

555

filed 13F for Mar 2026

▲+6 vs prior quarter

Net Shares Added (QoQ)

+14.19Mn

accumulated since last quarter

Value of Holdings

$9.63Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 31 Mar, 2026

Sei Investments Co (NASDAQ:SEIC) appears in 555 institutional 13F filings for the quarter ending March 2026.

Collectively, these holders controlled 74.0% of Sei Investments's outstanding shares in March 2026, up from 71.8% in December 2025.
They increased total shares held in SEIC by 18.7% quarter over quarter, and investors in Sei Investments increased 0.91% from a year ago.
Activity in SEIC broke down as 289 buyers, 176 sellers, and 90 unchanged among 555 total holders.
Institutional investors collectively held 90.08Mn shares in Sei Investments as of March 2026, up by 14.19Mn shares quarter on quarter, and down 9.67Mn shares year over year.
BlackRock, Inc. holds the largest position in SEIC at 10.11Mn shares as of March 31, 2026, or 8.31% of shares outstanding.
Leading buyers of Sei Investments shares for the quarter ending March 2026 were VANGUARD PORTFOLIO MANAGEMENT LLC (6.13Mn), VANGUARD CAPITAL MANAGEMENT LLC (4.74Mn), Boston Partners (1.77Mn), FMR LLC (749.32K), VANGUARD FIDUCIARY TRUST CO (590.06K).
Top sellers of SEIC stock for the quarter ending March 2026 included Invesco Ltd. (586.98K), Qube Research & Technologies Ltd (438.22K), UBS Group AG (319.59K), Goldman Sachs Group Inc (314.29K), Morgan Stanley (282.9K).
Per Business Quant data, the top 10 holders of Sei Investments for the quarter ending March 2026 are BlackRock, Inc. (10.11Mn), LOOMIS SAYLES & CO L P (8.63Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (6.13Mn), Morgan Stanley (4.79Mn), VANGUARD CAPITAL MANAGEMENT LLC (4.74Mn), State Street Corp (4.19Mn), Bank Of America Corp /De/ (2.92Mn), GEODE CAPITAL MANAGEMENT, LLC (2.83Mn), LORD, ABBETT & CO. LLC (2.2Mn), FMR LLC (2.09Mn).

Form 13F Holdings

555 Institutional Holders

Report period 31 Mar, 2026

Total shares held 90.08Mn

Of outstanding 74.05%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	10,110,337	8.31%	▲472,497	+4.90%	$793.36Mn
2	LOOMIS SAYLES & CO L P	0000312348	8,628,879	7.09%	▼115,755	-1.32%	$677.11Mn
3	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	6,125,643	5.04%	▲6,125,643	0.00%	$480.68Mn
4	Morgan Stanley	0000895421	4,792,279	3.94%	▼282,899	-5.57%	$376.05Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	4,741,716	3.90%	▲4,741,716	0.00%	$372.08Mn
6	State Street Corp	0000093751	4,185,178	3.44%	▼97,887	-2.29%	$328.41Mn
7	Bank Of America Corp /De/	0000070858	2,920,506	2.40%	▼1,817	-0.06%	$229.17Mn
8	GEODE CAPITAL MANAGEMENT, LLC	0001214717	2,830,332	2.33%	▼63,985	-2.21%	$222.13Mn
9	LORD, ABBETT & CO. LLC	0000728100	2,204,379	1.81%	▲287,009	+14.97%	$172.98K
10	FMR LLC	0000315066	2,092,499	1.72%	▲749,325	+55.79%	$164.20Mn
11	DIMENSIONAL FUND ADVISORS LP	0000354204	1,873,198	1.54%	▲20,054	+1.08%	$146.98Mn
12	FIRST TRUST ADVISORS LP	0001125816	1,822,669	1.50%	▲21,731	+1.21%	$143.02Mn
13	Beutel, Goodman & Co Ltd.	0001361974	1,773,154	1.46%	▼109,273	-5.80%	$139.14K
14	Boston Partners	0001386060	1,770,039	1.45%	▲1,770,039	0.00%	$138.89Mn
15	CAISSE DE DEPOT ET PLACEMENT DU QUEBEC	0000898286	1,198,089	0.98%	▼182,908	-13.24%	$94.01Mn
16	Invesco Ltd.	0000914208	1,145,404	0.94%	▼586,980	-33.88%	$89.88Mn
17	Boston Trust Walden Corp	0001534866	1,039,731	0.85%	▼45,059	-4.15%	$81.59Mn
18	ROYCE & ASSOCIATES LP	0000906304	996,456	0.82%	▲90,117	+9.94%	$78.19Mn
19	Franklin Resources Inc	0000038777	983,113	0.81%	▲164,419	+20.08%	$77.14Mn
20	Bank of New York Mellon Corp	0001390777	936,302	0.77%	▼54,349	-5.49%	$73.47Mn

Showing 1 to 20 of 555 holders