Save your place

Sign in to WhoBought

Please try again later.

SEI Investments Company (SEIC) institutional ownership

Latest close $97.65 Jul 21, 2026
Market cap$10.9B 52-week range SectorFinancial Services
Funds holding · Q1 2026
518
reported SEIC position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Net bought $84M
278 buyers · 240 sellers

SEI Investments Company (SEIC) price and institutional activity

Dates

Q1 2026

$620M bought by 278 investors
Boston Partners$146MFMR LLC$62M +276 more
$535M sold by 240 investors
Norges-$54MInvesco Ltd.-$48M +238 more
Bought Sold Totals per quarter; hover a bar for the names.

SEI Investments Company (SEIC) institutional activity · 518

Investor Type Est. change Change Δ Own Date
Boston Partners · New +$146M
Change +1.8M Date Q1 2026
Boston Partners New· Q1 2026 +$146M +1.8M Q1 2026
FMR LLC · Added +$62M
Change +749K Δ Own +55.8% Date Q1 2026
FMR LLC Added· Q1 2026 +$62M +749K +55.8% Q1 2026
Norges · Exited −$54M
Change −653K Δ Own −100.0% Date Q1 2026
Norges Exited· Q1 2026 −$54M −653K −100.0% Q1 2026
Invesco Ltd. · Reduced −$48M
Change −587K Δ Own −33.9% Date Q1 2026
Invesco Ltd. Reduced· Q1 2026 −$48M −587K −33.9% Q1 2026
First Financial Bankshares Inc · New +$46M
Change +554K Date Q1 2026
First Financial Bankshares Inc New· Q1 2026 +$46M +554K Q1 2026
Vanguard · Added +$45M
Change +543K Date Q1 2026
Vanguard Added· Q1 2026 +$45M +543K Q1 2026
BlackRock · Added +$39M
Change +472K Date Q1 2026
BlackRock Added· Q1 2026 +$39M +472K Q1 2026
Qube Research & Technologies Ltd · Reduced −$36M
Change −438K Date Q1 2026
Qube Research & Technologies Ltd Reduced· Q1 2026 −$36M −438K Q1 2026
UBS Group AG · Reduced −$26M
Change −320K Date Q1 2026
UBS Group AG Reduced· Q1 2026 −$26M −320K Q1 2026
Lord, Abbett & Co. LLC · Added +$24M
Change +287K Date Q1 2026
Lord, Abbett & Co. LLC Added· Q1 2026 +$24M +287K Q1 2026
Morgan Stanley · Reduced −$23M
Change −283K Date Q1 2026
Morgan Stanley Reduced· Q1 2026 −$23M −283K Q1 2026
Quantinno Capital Management LP · Added +$23M
Change +278K Date Q1 2026
Quantinno Capital Management LP Added· Q1 2026 +$23M +278K Q1 2026
Millennium Management LLC · Reduced −$21M
Change −253K Date Q1 2026
Millennium Management LLC Reduced· Q1 2026 −$21M −253K Q1 2026
Balyasny Asset Management L.P. · New +$19M
Change +226K Date Q1 2026
Balyasny Asset Management L.P. New· Q1 2026 +$19M +226K Q1 2026
Azora Capital LP · Exited −$18M
Change −216K Δ Own −100.0% Date Q1 2026
Azora Capital LP Exited· Q1 2026 −$18M −216K −100.0% Q1 2026
Data through Q1 2026 · filed Jun 3, 2026
15 of 518

Famous investor activity in SEI Investments Company (SEIC)

SEI Investments Company (SEIC) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
West Alfred P. Jr · Other 2 operations −$641K
Price $87.18–$88.09 Qty −7K Owned 6.8M ΔOwn −0.1% Trade date Jun 29, 2026 Filed date Jun 29, 2026
West Alfred P. Jr Other 2 operations $87.18–$88.09 −7K −$641K 6.8M −0.1% Jun 29, 2026 Jun 29, 2026
West Alfred P. Jr · Other 2 operations −$4.4M
Price $87.21–$87.67 Qty −50K Owned 6.8M ΔOwn −0.7% Trade date Jun 26, 2026 Filed date Jun 29, 2026
West Alfred P. Jr Other 2 operations $87.21–$87.67 −50K −$4.4M 6.8M −0.7% Jun 26, 2026 Jun 29, 2026
Doran William · Director Sell −$452K
Price $90.50 Qty −5K Owned 619K Trade date Jun 9, 2026 Filed date Jun 11, 2026
Doran William Director Sell $90.50 −5K −$452K 619K Jun 9, 2026 Jun 11, 2026
McCarthy Kathryn · Director Sell −$911K
Price $91.07 Qty −10K Owned 78K Trade date May 4, 2026 Filed date May 5, 2026
McCarthy Kathryn Director Sell $91.07 −10K −$911K 78K May 4, 2026 May 5, 2026
McCarthy Kathryn · Director 4 operations 0
Price $49.63 Owned 0 Trade date May 4, 2026 Filed date May 5, 2026
McCarthy Kathryn Director 4 operations $49.63 0 0 May 4, 2026 May 5, 2026
Warner Mark Andrew · Officer Sell −$365K
Price $91.16 Qty −4K Owned 921 Trade date Apr 28, 2026 Filed date Apr 30, 2026
Warner Mark Andrew Officer Sell $91.16 −4K −$365K 921 Apr 28, 2026 Apr 30, 2026
Warner Mark Andrew · Officer 3 operations 0
Price $48.47 Owned 0 Trade date Apr 28, 2026 Filed date Apr 30, 2026
Warner Mark Andrew Officer 3 operations $48.47 0 0 Apr 28, 2026 Apr 30, 2026
McCabe Philip · Officer Sell −$1.4M
Price $91.82 Qty −15K Owned 55K Trade date Apr 23, 2026 Filed date Apr 24, 2026
McCabe Philip Officer Sell $91.82 −15K −$1.4M 55K Apr 23, 2026 Apr 24, 2026
Sharma Sanjay · Officer 2 operations −$2.3M
Price $90.08–$90.73 Qty −25K Owned 40K Trade date Apr 23, 2026 Filed date Apr 23, 2026
Sharma Sanjay Officer 2 operations $90.08–$90.73 −25K −$2.3M 40K Apr 23, 2026 Apr 23, 2026
Sharma Sanjay · Officer 4 operations 0
Price $49.63 Owned 0 Trade date Apr 23, 2026 Filed date Apr 23, 2026
Sharma Sanjay Officer 4 operations $49.63 0 0 Apr 23, 2026 Apr 23, 2026
Peterson Michael · Officer Sell −$900K
Price $90.00 Qty −10K Owned 20K Trade date Apr 23, 2026 Filed date Apr 23, 2026
Peterson Michael Officer Sell $90.00 −10K −$900K 20K Apr 23, 2026 Apr 23, 2026
Peterson Michael · Officer 2 operations 0
Price $48.47 Owned 0 Trade date Apr 23, 2026 Filed date Apr 23, 2026
Peterson Michael Officer 2 operations $48.47 0 0 Apr 23, 2026 Apr 23, 2026
Hicke Ryan · Director Tax withholding or exercise payment (F) -$336K
Price $77.21 Qty -4K Owned 193K Trade date Mar 31, 2026 Filed date Apr 1, 2026
Hicke Ryan Director Tax withholding or exercise payment (F) $77.21 -4K -$336K 193K Mar 31, 2026 Apr 1, 2026
Denham Sean · Officer Tax withholding or exercise payment (F) -$604K
Price $78.77 Qty -8K Owned 58K Trade date Mar 18, 2026 Filed date Mar 19, 2026
Denham Sean Officer Tax withholding or exercise payment (F) $78.77 -8K -$604K 58K Mar 18, 2026 Mar 19, 2026
West Alfred P. Jr · Other 2 operations −$590K
Price $79.11–$79.94 Qty −7K Owned 6.9M Trade date Mar 11, 2026 Filed date Mar 12, 2026
West Alfred P. Jr Other 2 operations $79.11–$79.94 −7K −$590K 6.9M Mar 11, 2026 Mar 12, 2026
15 of 67
15 of 67 Sign in to continue to older insider transactions.

SEI Investments Company (SEIC) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Vanguard Group Inc 11.9M
% of shares outstanding 9.0% Filing date Feb 13, 2024
Vanguard Group Inc 11.9M 9.0% Feb 13, 2024
BlackRock Inc. 11.2M
% of shares outstanding 8.5% Filing date Jan 25, 2024
BlackRock Inc. 11.2M 8.5% Jan 25, 2024
Loomis, Sayles & Co., L.P. 8.7M
% of shares outstanding 7.1% Filing date May 14, 2026
Loomis, Sayles & Co., L.P. 8.7M 7.1% May 14, 2026
Vanguard Portfolio Management 6.1M
% of shares outstanding 5.0% Filing date Apr 29, 2026
Vanguard Portfolio Management 6.1M 5.0% Apr 29, 2026
Morgan Stanley 6.3M
% of shares outstanding 4.7% Filing date Feb 10, 2023
Morgan Stanley 6.3M 4.7% Feb 10, 2023
5 of 5

SEI Investments Company (SEIC) ownership FAQ

Who owns SEIC?

518 reporting institutions disclosed SEIC position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.