SEI Investments Co
SEIC- Exchange
- Nasdaq
- Industry
- Security Brokers, Dealers & Flotation Companies
- SEC CIK
- 0000350894
In the last 90 days, SEI Investments Co insiders filed 0 open-market purchases and 10 sales; 575 institutions reported holding it in 13F filings for Q2 2026, worth $7.94B in total; Markel Group is the only superinvestor holding it.
13F holders, Q3 2025
Institutional positions in SEI Investments Co as of Sep 30, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 550
- −6 vs. Q2 2025
- Shares held
- 88.5M
- −812.5K (−0.9%) vs. Q2 2025
- Total value
- $7.51B
- −$521.0M (−6.5%) vs. Q2 2025
- New holders
- 60
- 209 more added
- Sold out
- 66
- 171 more reduced
8 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting SEIC on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 575 | $7.94B |
| Q1 2026 | 569 | $7.06B |
| Q4 2025 | 562 | $7.31B |
| Q3 2025 | 550 | $7.51B |
| Q2 2025 | 564 | $8.09B |
| Q1 2025 | 546 | $7.27B |
| Q4 2024 | 540 | $7.52B |
| Q3 2024 | 502 | $6.35B |
| Q2 2024 | 493 | $6.02B |
| Q1 2024 | 475 | $6.77B |
| Q4 2023 | 491 | $5.90B |
| Q3 2023 | 462 | $5.63B |
| Q2 2023 | 458 | $5.53B |
| Q1 2023 | 444 | $5.36B |
| Q4 2022 | 446 | $5.45B |
| Q3 2022 | 433 | $4.63B |
| Q2 2022 | 456 | $5.18B |
| Q1 2022 | 465 | $5.81B |
| Q4 2021 | 472 | $5.94B |
| Q3 2021 | 446 | $5.73B |
| Q2 2021 | 440 | $6.04B |
| Q1 2021 | 443 | $5.97B |
Institutions, Q3 2025
Shares, value and share of portfolio for each institution holding SEI Investments Co; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Group Inc | 11,260,591 | $955.5M | 0.01% | +30,970+0.3% | Added |
| BlackRock, Inc. | 9,262,602 | $785.9M | 0.01% | +60,582+0.7% | Added |
| Loomis Sayles & Co L P | 8,976,049 | $761.6M | 0.91% | +134,800+1.5% | Added |
| Morgan Stanley | 5,593,742 | $474.6M | 0.03% | −40,586−0.7% | Reduced |
| State Street Corp | 4,536,582 | $384.9M | 0.01% | −208,903−4.4% | Reduced |
| Bank of America Corp | 3,121,067 | $264.8M | 0.02% | −39,569−1.3% | Reduced |
| Geode Capital Management, LLC | 2,784,343 | $236.3M | 0.02% | +208,306+8.1% | Added |
| Beutel, Goodman & Co Ltd. | 2,022,950 | $171.6M | 1.03% | −577,666−22.2% | Reduced |
| Dimensional Fund Advisors LP | 1,863,052 | $158.1M | 0.03% | +31,953+1.7% | Added |
| Invesco Ltd. | 1,731,523 | $146.9M | 0.02% | +68,873+4.1% | Added |
| First Trust Advisors LP | 1,725,019 | $146.4M | 0.11% | −2,315−0.1% | Reduced |
| Lord, Abbett & Co. LLC | 1,608,382 | $136.5M | 0.41% | +125,533+8.5% | Added |
| FMR LLC | 1,349,630 | $114.5M | 0.01% | +511,552+61.0% | Added |
| Caisse de Depot Et Placement du Quebec | 1,343,757 | $114.0M | 0.21% | +317,703+31.0% | Added |
| Boston Trust Walden Corp | 1,105,409 | $93.8M | 0.69% | −264,265−19.3% | Reduced |
| Bank of New York Mellon Corp | 1,013,911 | $86.0M | 0.02% | −6,428−0.6% | Reduced |
| Royal Bank of Canada | 951,082 | $80.7M | 0.01% | −172,054−15.3% | Reduced |
| Northern Trust Corp | 922,620 | $78.3M | 0.01% | +8,155+0.9% | Added |
| Royce & Associates LP | 903,583 | $76.7M | 0.76% | −323,169−26.3% | Reduced |
| UBS Asset Management Americas Inc | 883,753 | $75.0M | 0.02% | +22,263+2.6% | Added |
| Ameriprise Financial Inc | 815,694 | $69.2M | 0.02% | +221,033+37.2% | Added |
| Qube Research & Technologies Ltd | 766,775 | $65.1M | 0.09% | +346,696+82.5% | Added |
| Prana Capital Management, LP | 711,311 | $60.4M | 2.01% | +269,023+60.8% | Added |
| Charles Schwab Investment Management Inc | 662,458 | $56.2M | 0.01% | −4,123−0.6% | Reduced |
| Millennium Management LLC | 655,689 | $55.6M | 0.04% | +74,255+12.8% | Added |
| Franklin Resources Inc | 638,486 | $54.2M | 0.01% | +93,127+17.1% | Added |
| American Capital Management Inc | 565,117 | $48.0M | 1.91% | +101,341+21.9% | Added |
| Raymond James Financial Inc | 528,314 | $44.8M | 0.01% | −14,277−2.6% | Reduced |
| Natixis Advisors, L.P. | 511,066 | $43.4M | 0.06% | −18,568−3.5% | Reduced |
| AQR Capital Management LLC | 467,344 | $39.7M | 0.03% | +74,839+19.1% | Added |
| UBS Group AG | 443,722 | $37.6M | 0.01% | +62,628+16.4% | Added |
| Voloridge Investment Management, LLC | 406,237 | $34.5M | 0.12% | +120,540+42.2% | Added |
| ProShare Advisors LLC | 389,621 | $33.1M | 0.07% | −62,533−13.8% | Reduced |
| Renaissance Technologies LLC | 386,926 | $32.8M | 0.04% | −35,000−8.3% | Reduced |
| JPMorgan Chase & Co | 381,134 | $32.3M | 0.00% | +9,106+2.4% | Added |
| Envestnet Asset Management Inc | 361,436 | $30.7M | 0.01% | +5,399+1.5% | Added |
| Arrowstreet Capital, Limited Partnership | 329,970 | $28.0M | 0.02% | −36,772−10.0% | Reduced |
| Rhumbline Advisers | 326,240 | $27.7M | 0.02% | +9,859+3.1% | Added |
| Man Group plc | 314,194 | $26.7M | 0.05% | +91,241+40.9% | Added |
| Retirement Systems of Alabama | 289,851 | $24.6M | 0.08% | +15,222+5.5% | Added |
| Jupiter Asset Management Ltd | 277,462 | $23.5M | 0.20% | −139,743−33.5% | Reduced |
| JLB & Associates Inc | 266,544 | $22.6M | 2.97% | −1,717−0.6% | Reduced |
| Bridgewater Associates, LP | 262,502 | $22.3M | 0.09% | +132,915+102.6% | Added |
| Thrivent Financial for Lutherans | 252,231 | $21.4M | 0.04% | +147,938+141.8% | Added |
| Goldman Sachs Group Inc | 240,350 | $20.4M | 0.00% | −183,544−43.3% | Reduced |
| Alps Advisors Inc | 236,376 | $20.1M | 0.11% | −40,073−14.5% | Reduced |
| Nuveen, LLC | 236,113 | $20.0M | 0.01% | −663−0.3% | Reduced |
| Legal & General Group Plc | 229,985 | $19.5M | 0.00% | −11,546−4.8% | Reduced |
| Martingale Asset Management L P | 216,904 | $18.4M | 0.46% | −11,100−4.9% | Reduced |
| Principal Financial Group Inc | 208,988 | $17.7M | 0.01% | −5,920−2.8% | Reduced |
| Citadel Advisors LLC | 206,698 | $17.5M | 0.01% | +4,122+2.0% | Added |
| Swiss National Bank | 205,100 | $17.4M | 0.01% | +1,000+0.5% | Added |
| Interval Partners, LP | 203,914 | $17.3M | 0.37% | −25,839−11.2% | Reduced |
| Leith Wheeler Investment Counsel Ltd. | 203,305 | $17.3M | 1.17% | +2,896+1.4% | Added |
| California Public Employees Retirement System | 199,122 | $16.9M | 0.01% | +20,661+11.6% | Added |
| State of Alaska, Department of Revenue | 198,116 | $16.8M | 0.17% | −549−0.3% | Reduced |
| Los Angeles Capital Management LLC | 194,201 | $16.5M | 0.06% | +123,701+175.5% | Added |
| Public Employees Retirement Association of Colorado | 178,435 | $15.1M | 0.06% | +174,290+4,204.8% | Added |
| Vestcor Inc | 174,337 | $14.8M | 0.44% | −135−0.1% | Reduced |
| Allianz Asset Management GmbH | 174,266 | $14.8M | 0.02% | +30,411+21.1% | Added |
| Markel Group Inc.SuperinvestorMarkel Group | 173,200 | $14.7M | 0.12% | 00.0% | Unchanged |
| Brandywine Global Investment Management, LLC | 166,317 | $14.1M | 0.10% | +11,740+7.6% | Added |
| Foyston, Gordon, & Payne Inc | 155,513 | $13.2M | 2.88% | +4,032+2.7% | Added |
| Barclays PLC | 155,403 | $13.2M | 0.00% | +1,325+0.9% | Added |
| Schonfeld Strategic Advisors LLC | 155,388 | $13.2M | 0.09% | +11,703+8.1% | Added |
| Quantinno Capital Management LP | 151,920 | $12.9M | 0.04% | +48,914+47.5% | Added |
| Advisor Group Holdings, Inc. | 144,219 | $12.7M | 0.02% | +4,565+3.3% | Added |
| Janney Montgomery Scott LLC | 139,287 | $11.8M | 0.03% | +3,776+2.8% | Added |
| Victory Capital Management Inc | 135,162 | $11.5M | 0.01% | −18,374−12.0% | Reduced |
| Robeco Institutional Asset Management B.V. | 131,252 | $11.1M | 0.02% | +54,067+70.0% | Added |
| Alliancebernstein L.P. | 129,975 | $11.0M | 0.00% | +3,442+2.7% | Added |
| KLP Kapitalforvaltning AS | 126,900 | $10.8M | 0.04% | −28,600−18.4% | Reduced |
| State Board of Administration of Florida Retirement System | 124,830 | $10.6M | 0.02% | −12,299−9.0% | Reduced |
| King Luther Capital Management Corp | 124,726 | $10.6M | 0.04% | −13,539−9.8% | Reduced |
| M&G Plc | 122,508 | $10.4M | 0.06% | +122,508 | New |
| Rockefeller Capital Management L.P. | 119,886 | $10.2M | 0.02% | +19,849+19.8% | Added |
| Wells Fargo & Company | 119,567 | $10.1M | 0.00% | +23,900+25.0% | Added |
| New York State Teachers Retirement System | 116,155 | $9.86M | 0.02% | −1,346−1.1% | Reduced |
| LPL Financial LLC | 112,555 | $9.55M | 0.00% | +13,500+13.6% | Added |
| American Century Companies Inc | 112,137 | $9.51M | 0.00% | −4,024−3.5% | Reduced |
| TD Asset Management Inc | 111,238 | $9.44M | 0.01% | −14,438−11.5% | Reduced |
| Jane Street Group, LLC | 110,316 | $9.36M | 0.01% | −268,056−70.8% | Reduced |
| Acadian Asset Management LLC | 109,183 | $9.26M | 0.02% | +4,496+4.3% | Added |
| Truist Financial Corp | 108,625 | $9.22M | 0.01% | −6,528−5.7% | Reduced |
| Hahn Capital Management LLC | 108,367 | $9.19M | 4.41% | −4,840−4.3% | Reduced |
| Bank of Montreal | 107,664 | $9.14M | 0.00% | −15,434−12.5% | Reduced |
| Toroso Investments, LLC | 105,187 | $8.93M | 0.04% | +21,054+25.0% | Added |
| Teacher Retirement System of Texas | 102,295 | $8.68M | 0.03% | +7,584+8.0% | Added |
| Van Eck Associates Corp | 101,009 | $8.57M | 0.01% | −34,187−25.3% | Reduced |
| Schroder Investment Management Group | 99,697 | $8.52M | 0.01% | +13,545+15.7% | Added |
| California State Teachers Retirement System | 99,225 | $8.42M | 0.01% | −5,544−5.3% | Reduced |
| Engineers Gate Manager LP | 97,094 | $8.24M | 0.09% | +9,977+11.5% | Added |
| Capital Fund Management S.A. | 95,285 | $8.08M | 0.08% | +47,683+100.2% | Added |
| Kathmere Capital Management, LLC | 93,022 | $7.89M | 0.56% | +19,000+25.7% | Added |
| Russell Investments Group, Ltd. | 91,796 | $7.79M | 0.01% | −53,207−36.7% | Reduced |
| Balyasny Asset Management LLC | 88,345 | $7.50M | 0.02% | +88,345 | New |
| State of Wisconsin Investment Board | 85,681 | $7.27M | 0.02% | −6,782−7.3% | Reduced |
| Thrive Wealth Management, LLC | 79,296 | $6.73M | 1.02% | +40,463+104.2% | Added |
| Chevy Chase Trust Holdings, Inc. | 78,235 | $6.64M | 0.02% | −817−1.0% | Reduced |
| Price T Rowe Associates Inc | 77,852 | $6.61M | 0.00% | +5,548+7.7% | Added |