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, 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 |
|---|---|---|---|---|---|
| BlackRock, Inc. | 10,110,337 | $793.4M | 0.01% | +472,497+4.9% | Added |
| Loomis Sayles & Co L P | 8,628,879 | $677.1M | 0.91% | −115,755−1.3% | Reduced |
| Vanguard Portfolio Management LLC | 6,125,643 | $480.7M | 0.03% | +6,125,643 | New |
| Morgan Stanley | 4,792,279 | $376.1M | 0.02% | −282,899−5.6% | Reduced |
| Vanguard Capital Management LLC | 4,741,716 | $372.1M | 0.01% | +4,741,716 | New |
| State Street Corp | 4,185,178 | $328.4M | 0.01% | −97,887−2.3% | Reduced |
| Bank of America Corp | 2,920,506 | $229.2M | 0.02% | −1,817−0.1% | Reduced |
| Geode Capital Management, LLC | 2,830,332 | $222.1M | 0.01% | −63,985−2.2% | Reduced |
| Lord, Abbett & Co. LLC | 2,204,379 | $173.0M | 0.56% | +287,009+15.0% | Added |
| FMR LLC | 2,092,499 | $164.2M | 0.01% | +749,325+55.8% | Added |
| Dimensional Fund Advisors LP | 1,873,198 | $147.0M | 0.03% | +20,054+1.1% | Added |
| First Trust Advisors LP | 1,822,669 | $143.0M | 0.10% | +21,731+1.2% | Added |
| Beutel, Goodman & Co Ltd. | 1,773,154 | $139.1M | 0.94% | −109,273−5.8% | Reduced |
| Boston Partners | 1,770,039 | $138.9M | 0.15% | +1,770,039 | New |
| Caisse de Depot Et Placement du Quebec | 1,198,089 | $94.0M | 0.15% | −182,908−13.2% | Reduced |
| Invesco Ltd. | 1,145,404 | $89.9M | 0.01% | −586,980−33.9% | Reduced |
| Boston Trust Walden Corp | 1,039,731 | $81.6M | 0.67% | −45,059−4.2% | Reduced |
| Royce & Associates LP | 996,456 | $78.2M | 0.77% | +90,117+9.9% | Added |
| Franklin Resources Inc | 983,113 | $77.1M | 0.02% | +164,419+20.1% | Added |
| Bank of New York Mellon Corp | 936,302 | $73.5M | 0.01% | −54,349−5.5% | Reduced |
| Northern Trust Corp | 905,607 | $71.1M | 0.01% | +14,131+1.6% | Added |
| Ameriprise Financial Inc | 869,549 | $68.2M | 0.02% | +48,088+5.9% | Added |
| Clark Capital Management Group, Inc. | 837,845 | $65.7M | 0.41% | +191,986+29.7% | Added |
| American Capital Management Inc | 768,615 | $60.3M | 3.24% | +193,796+33.7% | Added |
| Charles Schwab Investment Management Inc | 696,473 | $54.7M | 0.01% | +32,124+4.8% | Added |
| Vanguard Fiduciary Trust Co | 590,060 | $46.3M | 0.01% | +590,060 | New |
| Raymond James Financial Inc | 572,163 | $44.9M | 0.01% | +39,805+7.5% | Added |
| Arrowstreet Capital, Limited Partnership | 567,967 | $44.6M | 0.02% | +104,321+22.5% | Added |
| First Financial Bankshares Inc | 554,178 | $43.5M | 0.88% | +554,178 | New |
| PFA Pension, Forsikringsaktieselskab | 519,311 | $40.8M | 0.12% | −10.0% | Reduced |
| Envestnet Asset Management Inc | 498,522 | $39.1M | 0.01% | +70,735+16.5% | Added |
| Natixis Advisors, L.P. | 469,864 | $36.9M | 0.05% | −612−0.1% | Reduced |
| Prana Capital Management, LP | 464,241 | $36.4M | 1.12% | −186,925−28.7% | Reduced |
| UBS Asset Management Americas Inc | 455,914 | $35.8M | 0.01% | +1,778+0.4% | Added |
| JPMorgan Chase & Co | 461,660 | $35.6M | 0.00% | +28,190+6.5% | Added |
| Victory Capital Management Inc | 427,591 | $33.6M | 0.02% | +44,750+11.7% | Added |
| AQR Capital Management LLC | 420,042 | $33.0M | 0.02% | −31,831−7.0% | Reduced |
| Royal Bank of Canada | 416,650 | $32.7M | 0.01% | −194,524−31.8% | Reduced |
| Voloridge Investment Management, LLC | 411,851 | $32.3M | 0.13% | +33,637+8.9% | Added |
| Renaissance Technologies LLC | 399,826 | $31.4M | 0.05% | +2,600+0.7% | Added |
| Quantinno Capital Management LP | 382,361 | $30.0M | 0.05% | +277,771+265.6% | Added |
| Barclays PLC | 380,977 | $29.9M | 0.01% | +69,174+22.2% | Added |
| Man Group plc | 360,910 | $28.3M | 0.06% | +27,342+8.2% | Added |
| Connor, Clark & Lunn Investment Management Ltd. | 342,515 | $26.9M | 0.06% | +138,248+67.7% | Added |
| Thrivent Financial for Lutherans | 325,588 | $25.5M | 0.05% | +14,021+4.5% | Added |
| Goldman Sachs Group Inc | 324,129 | $25.4M | 0.00% | +4,921+1.5% | Added |
| Arbejdsmarkedets Tillaegspension | 323,418 | $25.4M | 0.63% | +38,242+13.4% | Added |
| UBS Group AG | 316,605 | $24.8M | 0.00% | −319,587−50.2% | Reduced |
| Rhumbline Advisers | 309,487 | $24.3M | 0.02% | +1520.0% | Added |
| ProShare Advisors LLC | 300,632 | $23.6M | 0.03% | −104,722−25.8% | Reduced |
| Retirement Systems of Alabama | 272,677 | $21.4M | 0.07% | −15,255−5.3% | Reduced |
| JLB & Associates Inc | 259,183 | $20.3M | 2.92% | −1,014−0.4% | Reduced |
| Bridgewater Associates, LP | 232,675 | $18.3M | 0.08% | −113,202−32.7% | Reduced |
| Balyasny Asset Management LLC | 225,674 | $17.7M | 0.03% | +225,674 | New |
| Public Employees Retirement Association of Colorado | 219,635 | $17.2M | 0.07% | +41,200+23.1% | Added |
| Alps Advisors Inc | 213,892 | $16.8M | 0.08% | −9,185−4.1% | Reduced |
| Principal Financial Group Inc | 207,688 | $16.3M | 0.01% | +7,326+3.7% | Added |
| Swiss National Bank | 205,900 | $16.2M | 0.01% | −1,200−0.6% | Reduced |
| California Public Employees Retirement System | 198,469 | $15.6M | 0.01% | +4,819+2.5% | Added |
| Leith Wheeler Investment Counsel Ltd. | 196,249 | $15.4M | 1.27% | −134−0.1% | Reduced |
| Crestwood Advisors Group LLC | 196,213 | $15.4M | 0.26% | +147,406+302.0% | Added |
| Legal & General Group Plc | 188,572 | $14.8M | 0.00% | −1,671−0.9% | Reduced |
| Amundi | 188,563 | $14.8M | 0.00% | +171,815+1,025.9% | Added |
| Nuveen, LLC | 175,211 | $13.7M | 0.00% | +1,881+1.1% | Added |
| Markel Group Inc.SuperinvestorMarkel Group | 173,200 | $13.6M | 0.11% | 00.0% | Unchanged |
| LPL Financial LLC | 166,815 | $13.1M | 0.00% | +18,692+12.6% | Added |
| Toroso Investments, LLC | 161,493 | $12.6M | 0.04% | +28,171+21.1% | Added |
| Foyston, Gordon, & Payne Inc | 157,787 | $12.4M | 2.86% | −14,793−8.6% | Reduced |
| Rockefeller Capital Management L.P. | 152,565 | $12.0M | 0.02% | +2,557+1.7% | Added |
| Advisor Group Holdings, Inc. | 151,682 | $11.9M | 0.02% | +1,606+1.1% | Added |
| Interval Partners, LP | 136,227 | $10.7M | 0.37% | −48,669−26.3% | Reduced |
| Janney Montgomery Scott LLC | 132,908 | $10.4M | 0.03% | −16,003−10.7% | Reduced |
| Alliancebernstein L.P. | 126,476 | $10.4M | 0.00% | +1,490+1.2% | Added |
| KLP Kapitalforvaltning AS | 127,800 | $10.0M | 0.04% | +600+0.5% | Added |
| California State Teachers Retirement System | 125,866 | $9.88M | 0.01% | +26,839+27.1% | Added |
| Qube Research & Technologies Ltd | 124,992 | $9.81M | 0.01% | −438,220−77.8% | Reduced |
| Millennium Management LLC | 118,765 | $9.32M | 0.01% | −252,870−68.0% | Reduced |
| Creative Planning | 116,827 | $9.17M | 0.01% | +6,786+6.2% | Added |
| Bank of Montreal | 113,367 | $8.90M | 0.00% | +7,290+6.9% | Added |
| Wells Fargo & Company | 112,519 | $8.83M | 0.00% | +5,047+4.7% | Added |
| Vestcor Inc | 111,618 | $8.76M | 0.24% | −62,719−36.0% | Reduced |
| Truist Financial Corp | 110,666 | $8.68M | 0.01% | −629−0.6% | Reduced |
| King Luther Capital Management Corp | 109,370 | $8.58M | 0.04% | −28,069−20.4% | Reduced |
| State Board of Administration of Florida Retirement System | 109,091 | $8.56M | 0.02% | −7,279−6.3% | Reduced |
| New York State Teachers Retirement System | 108,584 | $8.52M | 0.02% | −3,245−2.9% | Reduced |
| TD Asset Management Inc | 107,556 | $8.44M | 0.01% | −2,644−2.4% | Reduced |
| Van Eck Associates Corp | 106,220 | $8.34M | 0.01% | +3,830+3.7% | Added |
| Robeco Institutional Asset Management B.V. | 104,774 | $8.22M | 0.01% | +16,988+19.4% | Added |
| Teacher Retirement System of Texas | 103,241 | $8.10M | 0.03% | −17,684−14.6% | Reduced |
| Stifel Financial Corp | 101,218 | $7.94M | 0.01% | +4,533+4.7% | Added |
| Kathmere Capital Management, LLC | 99,485 | $7.81M | 0.48% | +6,551+7.0% | Added |
| American Century Companies Inc | 95,230 | $7.47M | 0.00% | −33,277−25.9% | Reduced |
| Price T Rowe Associates Inc | 91,883 | $7.21M | 0.00% | +10,915+13.5% | Added |
| CI Private Wealth, LLC | 92,288 | $7.18M | 0.01% | +74,117+407.9% | Added |
| Vanguard Asset Management, Ltd | 90,046 | $7.07M | 0.01% | +90,046 | New |
| State of Wisconsin Investment Board | 86,845 | $6.81M | 0.02% | −1,595−1.8% | Reduced |
| Martingale Asset Management L P | 85,530 | $6.71M | 0.17% | −237−0.3% | Reduced |
| Hahn Capital Management LLC | 84,374 | $6.62M | 4.16% | −17,503−17.2% | Reduced |
| HSBC Holdings PLC | 83,464 | $6.57M | 0.00% | −97,252−53.8% | Reduced |
| CBOE Vest Financial, LLC | 82,571 | $6.48M | 0.08% | +11,747+16.6% | Added |