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 11 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, Q1 2026
Institutional positions in SEI Investments Co as of Mar 31, 2026. 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
- 569
- +16 vs. Q4 2025
- Shares held
- 90.0M
- +13.0M (+16.8%) vs. Q4 2025
- Total value
- $7.06B
- +$740.6M (+11.7%) vs. Q4 2025
- New holders
- 76
- 217 more added
- Sold out
- 60
- 179 more reduced
9 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2026
Shares, value and share of portfolio for each institution holding SEI Investments Co; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Rockefeller Capital Management L.P. | 152,565 | $12.0M | 0.02% | +2,557+1.7% | Added |
| Foyston, Gordon, & Payne Inc | 157,787 | $12.4M | 2.86% | −14,793−8.6% | Reduced |
| Toroso Investments, LLC | 161,493 | $12.6M | 0.04% | +28,171+21.1% | Added |
| LPL Financial LLC | 166,815 | $13.1M | 0.00% | +18,692+12.6% | Added |
| Markel Group Inc.SuperinvestorMarkel Group | 173,200 | $13.6M | 0.11% | 00.0% | Unchanged |
| Nuveen, LLC | 175,211 | $13.7M | 0.00% | +1,881+1.1% | Added |
| Amundi | 188,563 | $14.8M | 0.00% | +171,815+1,025.9% | Added |
| Legal & General Group Plc | 188,572 | $14.8M | 0.00% | −1,671−0.9% | Reduced |
| Crestwood Advisors Group LLC | 196,213 | $15.4M | 0.26% | +147,406+302.0% | Added |
| Leith Wheeler Investment Counsel Ltd. | 196,249 | $15.4M | 1.27% | −134−0.1% | Reduced |
| California Public Employees Retirement System | 198,469 | $15.6M | 0.01% | +4,819+2.5% | Added |
| Swiss National Bank | 205,900 | $16.2M | 0.01% | −1,200−0.6% | Reduced |
| Principal Financial Group Inc | 207,688 | $16.3M | 0.01% | +7,326+3.7% | Added |
| Alps Advisors Inc | 213,892 | $16.8M | 0.08% | −9,185−4.1% | Reduced |
| Public Employees Retirement Association of Colorado | 219,635 | $17.2M | 0.07% | +41,200+23.1% | Added |
| Balyasny Asset Management LLC | 225,674 | $17.7M | 0.03% | +225,674 | New |
| Bridgewater Associates, LP | 232,675 | $18.3M | 0.08% | −113,202−32.7% | Reduced |
| JLB & Associates Inc | 259,183 | $20.3M | 2.92% | −1,014−0.4% | Reduced |
| Retirement Systems of Alabama | 272,677 | $21.4M | 0.07% | −15,255−5.3% | Reduced |
| ProShare Advisors LLC | 300,632 | $23.6M | 0.03% | −104,722−25.8% | Reduced |
| Rhumbline Advisers | 309,487 | $24.3M | 0.02% | +1520.0% | Added |
| UBS Group AG | 316,605 | $24.8M | 0.00% | −319,587−50.2% | Reduced |
| Arbejdsmarkedets Tillaegspension | 323,418 | $25.4M | 0.63% | +38,242+13.4% | Added |
| Goldman Sachs Group Inc | 324,129 | $25.4M | 0.00% | +4,921+1.5% | Added |
| Thrivent Financial for Lutherans | 325,588 | $25.5M | 0.05% | +14,021+4.5% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 342,515 | $26.9M | 0.06% | +138,248+67.7% | Added |
| Man Group plc | 360,910 | $28.3M | 0.06% | +27,342+8.2% | Added |
| Barclays PLC | 380,977 | $29.9M | 0.01% | +69,174+22.2% | Added |
| Quantinno Capital Management LP | 382,361 | $30.0M | 0.05% | +277,771+265.6% | Added |
| Renaissance Technologies LLC | 399,826 | $31.4M | 0.05% | +2,600+0.7% | Added |
| Voloridge Investment Management, LLC | 411,851 | $32.3M | 0.13% | +33,637+8.9% | Added |
| Royal Bank of Canada | 416,650 | $32.7M | 0.01% | −194,524−31.8% | Reduced |
| AQR Capital Management LLC | 420,042 | $33.0M | 0.02% | −31,831−7.0% | Reduced |
| Victory Capital Management Inc | 427,591 | $33.6M | 0.02% | +44,750+11.7% | Added |
| JPMorgan Chase & Co | 461,660 | $35.6M | 0.00% | +28,190+6.5% | Added |
| UBS Asset Management Americas Inc | 455,914 | $35.8M | 0.01% | +1,778+0.4% | Added |
| Prana Capital Management, LP | 464,241 | $36.4M | 1.12% | −186,925−28.7% | Reduced |
| Natixis Advisors, L.P. | 469,864 | $36.9M | 0.05% | −612−0.1% | Reduced |
| Envestnet Asset Management Inc | 498,522 | $39.1M | 0.01% | +70,735+16.5% | Added |
| PFA Pension, Forsikringsaktieselskab | 519,311 | $40.8M | 0.12% | −10.0% | Reduced |
| First Financial Bankshares Inc | 554,178 | $43.5M | 0.88% | +554,178 | New |
| Arrowstreet Capital, Limited Partnership | 567,967 | $44.6M | 0.02% | +104,321+22.5% | Added |
| Raymond James Financial Inc | 572,163 | $44.9M | 0.01% | +39,805+7.5% | Added |
| Vanguard Fiduciary Trust Co | 590,060 | $46.3M | 0.01% | +590,060 | New |
| Charles Schwab Investment Management Inc | 696,473 | $54.7M | 0.01% | +32,124+4.8% | Added |
| American Capital Management Inc | 768,615 | $60.3M | 3.24% | +193,796+33.7% | Added |
| Clark Capital Management Group, Inc. | 837,845 | $65.7M | 0.41% | +191,986+29.7% | Added |
| Ameriprise Financial Inc | 869,549 | $68.2M | 0.02% | +48,088+5.9% | Added |
| Northern Trust Corp | 905,607 | $71.1M | 0.01% | +14,131+1.6% | Added |
| Bank of New York Mellon Corp | 936,302 | $73.5M | 0.01% | −54,349−5.5% | Reduced |
| Franklin Resources Inc | 983,113 | $77.1M | 0.02% | +164,419+20.1% | Added |
| Royce & Associates LP | 996,456 | $78.2M | 0.77% | +90,117+9.9% | Added |
| Boston Trust Walden Corp | 1,039,731 | $81.6M | 0.67% | −45,059−4.2% | Reduced |
| Invesco Ltd. | 1,145,404 | $89.9M | 0.01% | −586,980−33.9% | Reduced |
| Caisse de Depot Et Placement du Quebec | 1,198,089 | $94.0M | 0.15% | −182,908−13.2% | Reduced |
| Boston Partners | 1,770,039 | $138.9M | 0.15% | +1,770,039 | New |
| Beutel, Goodman & Co Ltd. | 1,773,154 | $139.1M | 0.94% | −109,273−5.8% | Reduced |
| First Trust Advisors LP | 1,822,669 | $143.0M | 0.10% | +21,731+1.2% | Added |
| Dimensional Fund Advisors LP | 1,873,198 | $147.0M | 0.03% | +20,054+1.1% | Added |
| FMR LLC | 2,092,499 | $164.2M | 0.01% | +749,325+55.8% | Added |
| Lord, Abbett & Co. LLC | 2,204,379 | $173.0M | 0.56% | +287,009+15.0% | Added |
| Geode Capital Management, LLC | 2,830,332 | $222.1M | 0.01% | −63,985−2.2% | Reduced |
| Bank of America Corp | 2,920,506 | $229.2M | 0.02% | −1,817−0.1% | Reduced |
| State Street Corp | 4,185,178 | $328.4M | 0.01% | −97,887−2.3% | Reduced |
| Vanguard Capital Management LLC | 4,741,716 | $372.1M | 0.01% | +4,741,716 | New |
| Morgan Stanley | 4,792,279 | $376.1M | 0.02% | −282,899−5.6% | Reduced |
| Vanguard Portfolio Management LLC | 6,125,643 | $480.7M | 0.03% | +6,125,643 | New |
| Loomis Sayles & Co L P | 8,628,879 | $677.1M | 0.91% | −115,755−1.3% | Reduced |
| BlackRock, Inc. | 10,110,337 | $793.4M | 0.01% | +472,497+4.9% | Added |
| Azora Capital LP | 0 | $0 | 0.00% | −216,465−100.0% | Sold out |
| M&G Plc | 0 | $0 | 0.00% | −134,004−100.0% | Sold out |
| Schroder Investment Management Group | 0 | $0 | 0.00% | −100,359−100.0% | Sold out |
| Winton Group Ltd | 0 | $0 | 0.00% | −76,615−100.0% | Sold out |
| Prudential PLC | 0 | $0 | 0.00% | −60,311−100.0% | Sold out |
| IFG Advisory, LLC | 0 | $0 | 0.00% | −59,147−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −44,564−100.0% | Sold out |
| Meeder Asset Management Inc | 0 | $0 | 0.00% | −36,348−100.0% | Sold out |
| Convergence Investment Partners, LLC | 0 | $0 | 0.00% | −27,640−100.0% | Sold out |
| Entropy Technologies, LP | 0 | $0 | 0.00% | −27,464−100.0% | Sold out |
| Canada Pension Plan Investment Board | 0 | $0 | 0.00% | −26,700−100.0% | Sold out |
| Pinebridge Investments LLC | 0 | $0 | 0.00% | −23,452−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −22,500−100.0% | Sold out |
| Caxton Associates LLP | 0 | $0 | 0.00% | −17,000−100.0% | Sold out |
| Diversify Advisory Services, LLC | 0 | $0 | 0.00% | −13,060−100.0% | Sold out |
| Redwood Investment Management, LLC | 0 | $0 | 0.00% | −13,315−100.0% | Sold out |
| Mackenzie Financial Corp | 0 | $0 | 0.00% | −12,946−100.0% | Sold out |
| Tudor Investment Corp Et Al | 0 | $0 | 0.00% | −12,508−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −10,224−100.0% | Sold out |
| Logan Capital Management Inc | 0 | $0 | 0.00% | −9,700−100.0% | Sold out |
| Voleon Capital Management LP | 0 | $0 | 0.00% | −9,287−100.0% | Sold out |
| Magnetar Financial LLC | 0 | $0 | 0.00% | −8,316−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −5,830−100.0% | Sold out |
| Optimize Financial Inc | 0 | $0 | 0.00% | −5,245−100.0% | Sold out |
| Farringdon Capital, Ltd. | 0 | $0 | 0.00% | −5,073−100.0% | Sold out |
| Advisor OS, LLC | 0 | $0 | 0.00% | −4,923−100.0% | Sold out |
| MJP Associates Inc | 0 | $0 | 0.00% | −4,774−100.0% | Sold out |
| HighPoint Advisor Group LLC | 0 | $0 | 0.00% | −4,123−100.0% | Sold out |
| WBH Advisory Inc | 0 | $0 | 0.00% | −4,000−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −3,851−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −3,776−100.0% | Sold out |