Sei Investments CompanySEIC
13F holders, Q1 2026 (March 31)569holders +8
66new positions
58sold out
8famous investors
$78.47avg. 13F price*
At the end of Q1 2026, 569 institutions reported holding Sei Investments Company (SEIC) in their 13F filings, up 8 from Q4 2025. 66 opened new positions and 58 sold out. The largest holders were BlackRock, Inc. ($793.4M), Loomis Sayles & Co. L P ($677.1M) and Vanguard Portfolio Management LLC ($480.7M). 8 famous investors held it, including Tom Gayner (0.1% of Markel Group's portfolio), Ray Dalio (0.1% of Bridgewater Associates's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Sei Investments Company
- CUSIP
- 784117103
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 66 | $233.3M |
| Exits | 58 | $79.4M |
All 13F filers, Q4 2025 → Q1 2026: 7,169,435 shares bought and 5,736,592 shares sold, net +1,432,843 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 569 holders
| BlackRock, Inc. | 0.01% | Add +4.9% | 10,110,337 | $793.4M |
| Loomis Sayles & Co. L P | 0.91% | Reduce -1.3% | 8,628,879 | $677.1M |
| Vanguard Portfolio Management LLC | 0.03% | — | 6,125,643 | $480.7M |
| Morgan Stanley | 0.02% | Reduce -5.6% | 4,792,279 | $376.1M |
| Vanguard Capital Management LLC | 0.01% | — | 4,741,716 | $372.1M |
| State Street Corp. | 0.01% | Reduce -2.3% | 4,185,178 | $328.4M |
| Bank of America Corp. | 0.02% | Reduce -0.1% | 2,920,506 | $229.2M |
| Geode Capital Management, LLC | 0.01% | Reduce -2.2% | 2,830,332 | $222.1M |
| Lord, Abbett & Co. LLC | 0.59% | Add +15.0% | 2,204,379 | $173.0M |
| FMR LLC | 0.01% | Add +55.8% | 2,092,499 | $164.2M |
| Dimensional Fund Advisors LP | 0.03% | Add +1.1% | 1,873,198 | $147.0M |
| First Trust Advisors LP | 0.10% | Add +1.2% | 1,822,669 | $143.0M |
| Beutel, Goodman & Co Ltd. | 0.94% | Reduce -5.8% | 1,773,154 | $139.1M |
| Boston Partners | 0.15% | New | 1,770,039 | $138.9M |
| Caisse de depot et placement du Quebec | 0.15% | Reduce -13.2% | 1,198,089 | $94.0M |
| Invesco Ltd. | 0.01% | Reduce -33.9% | 1,145,404 | $89.9M |
| Boston Trust Walden Corp | 0.67% | Reduce -4.2% | 1,039,731 | $81.6M |
| Royce & Associates LP | 0.77% | Add +9.9% | 996,456 | $78.2M |
| Franklin Resources Inc. | 0.02% | Add +20.1% | 983,113 | $77.1M |
| Bank of New York Mellon Corp | 0.01% | Reduce -5.5% | 936,302 | $73.5M |
| Northern Trust Corp. | 0.01% | Add +1.6% | 905,607 | $71.1M |
| Ameriprise Financial Inc. | 0.02% | Add +5.8% | 869,549 | $68.2M |
| Clark Capital Management Group, Inc. | 0.41% | Add +29.7% | 837,845 | $65.7M |
| American Capital Management Inc. | 3.24% | Add +33.7% | 768,615 | $60.3M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +4.8% | 696,473 | $54.7M |
| Vanguard Fiduciary Trust Co. | 0.01% | — | 590,060 | $46.3M |
| Raymond James Financial Inc. | 0.01% | Add +7.5% | 572,163 | $44.9M |
| Arrowstreet Capital, Limited Partnership | 0.02% | Add +22.5% | 567,967 | $44.6M |
| First Financial Bankshares Inc | 0.88% | New | 554,178 | $43.5M |
| PFA Pension, Forsikringsaktieselskab | 0.12% | Reduce 0.0% | 519,311 | $40.8M |
| Envestnet Asset Management Inc. | 0.01% | Add +16.5% | 498,522 | $39.1M |
| Natixis Advisors, LLC | 0.05% | Reduce -0.1% | 469,864 | $36.9M |
| Prana Capital Management, LP | 1.12% | Reduce -28.7% | 464,241 | $36.4M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.01% | Add +0.4% | 455,914 | $35.8M |
| JPMorgan Chase & Co. | 0.00% | Add +6.5% | 461,660 | $35.6M |
| Victory Capital Management Inc. | 0.02% | Add +11.7% | 427,591 | $33.6M |
| AQR Capital Management | 0.02% | Reduce -7.0% | 420,042 | $33.0M |
| Royal Bank of Canada | 0.01% | Reduce -31.8% | 416,650 | $32.7M |
| Voloridge Investment Management, LLC | 0.13% | Add +8.9% | 411,851 | $32.3M |
| Renaissance Technologies | 0.05% | Add +0.7% | 399,826 | $31.4M |
| Quantinno Capital Management LP | 0.05% | Add +265.6% | 382,361 | $30.0M |
| Barclays PLC | 0.01% | Add +22.2% | 380,977 | $29.9M |
| Man Group plc | 0.06% | Add +8.2% | 360,910 | $28.3M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.06% | Add +67.7% | 342,515 | $26.9M |
| Thrivent Financial for Lutherans | 0.05% | Add +4.5% | 325,588 | $25.5M |
| Goldman Sachs Group Inc. | 0.00% | Add +1.5% | 324,129 | $25.4M |
| Arbejdsmarkedets Tillaegspension | 0.63% | Add +13.4% | 323,418 | $25.4M |
| UBS Group AG | 0.00% | Reduce -50.2% | 316,605 | $24.8M |
| Rhumbline Advisers | 0.02% | Add +0.1% | 309,487 | $24.3M |
| ProShare Advisors LLC | 0.03% | Reduce -25.8% | 300,632 | $23.6M |
| Retirement Systems of Alabama | 0.07% | Reduce -5.3% | 272,677 | $21.4M |
| JLB & Associates Inc. | 2.92% | Reduce -0.4% | 259,183 | $20.3M |
| Bridgewater Associates | 0.08% | Reduce -32.7% | 232,675 | $18.3M |
| Balyasny Asset Management L.P. | 0.04% | New | 225,674 | $17.7M |
| Public Employees Retirement Association of Colorado | 0.07% | Add +23.1% | 219,635 | $17.2M |
| Alps Advisors Inc. | 0.08% | Reduce -4.1% | 213,892 | $16.8M |
| Principal Financial Group Inc. | 0.01% | Add +3.7% | 207,688 | $16.3M |
| Swiss National Bank | 0.01% | Reduce -0.6% | 205,900 | $16.2M |
| California Public Employees Retirement System | 0.01% | Add +2.5% | 198,469 | $15.6M |
| Leith Wheeler Investment Counsel Ltd. | 1.27% | Reduce -0.1% | 196,249 | $15.4M |
| Crestwood Advisors Group, LLC | 0.26% | Add +302.0% | 196,213 | $15.4M |
| Legal & General Group Plc | 0.00% | Reduce -0.9% | 188,572 | $14.8M |
| Amundi | 0.00% | Add +1025.9% | 188,563 | $14.8M |
| Nuveen, LLC | 0.00% | Add +1.1% | 175,211 | $13.7M |
| Markel Group | 0.11% | No change | 173,200 | $13.6M |
| LPL Financial LLC | 0.00% | Add +12.6% | 166,815 | $13.1M |
| Tidal Investments LLC | 0.04% | Add +21.1% | 161,493 | $12.6M |
| Foyston, Gordon & Payne Inc | 2.86% | Reduce -8.6% | 157,787 | $12.4M |
| Rockefeller Capital Management L.P. | 0.02% | Add +1.7% | 152,565 | $12.0M |
| Osaic Holdings, Inc. | 0.02% | Add +1.1% | 151,682 | $11.9M |
| Interval Partners, LP | 0.37% | Reduce -26.3% | 136,227 | $10.7M |
| Janney Montgomery Scott LLC | 0.03% | Reduce -10.8% | 132,908 | $10.4M |
| Alliancebernstein L.P. | 0.00% | Add +1.2% | 126,476 | $10.4M |
| KLP Kapitalforvaltning As | 0.04% | Add +0.5% | 127,800 | $10.0M |
| California State Teachers Retirement System | 0.01% | Add +27.1% | 125,866 | $9.9M |
| Qube Research & Technologies Ltd | 0.01% | Reduce -77.8% | 124,992 | $9.8M |
| Millennium Management | 0.01% | Reduce -68.0% | 118,765 | $9.3M |
| Creative Planning | 0.01% | Add +6.2% | 116,827 | $9.2M |
| Bank of Montreal | 0.00% | Add +6.9% | 113,367 | $8.9M |
| Wells Fargo & Company | 0.00% | Add +4.7% | 112,519 | $8.8M |
| Vestcor Inc | 0.24% | Reduce -36.0% | 111,618 | $8.8M |
| Truist Financial Corp. | 0.01% | Reduce -0.6% | 110,666 | $8.7M |
| King Luther Capital Management Corp. | 0.04% | Reduce -20.4% | 109,370 | $8.6M |
| State Board of Administration of Florida Retirement System | 0.02% | Reduce -6.3% | 109,091 | $8.6M |
| New York State Teachers Retirement System | 0.02% | Reduce -2.9% | 108,584 | $8.5M |
| TD Asset Management Inc | 0.01% | Reduce -2.4% | 107,556 | $8.4M |
| Van Eck Associates Corp. | 0.01% | Add +3.7% | 106,220 | $8.3M |
| Robeco Institutional Asset Management B.V. | 0.01% | Add +19.4% | 104,774 | $8.2M |
| Teacher Retirement System of Texas | 0.03% | Reduce -14.6% | 103,241 | $8.1M |
| Stifel Financial Corp. | 0.01% | Add +4.7% | 101,218 | $7.9M |
| Kathmere Capital Management, LLC | 0.48% | Add +7.0% | 99,485 | $7.8M |
| American Century Companies Inc. | 0.00% | Reduce -25.9% | 95,230 | $7.5M |
| T. Rowe Price Associates Inc. | 0.00% | Add +13.5% | 91,883 | $7.2M |
| Corient Private Wealth LP | 0.01% | Add +407.9% | 92,288 | $7.2M |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.01% | — | 90,046 | $7.1M |
| State of Wisconsin Investment Board | 0.02% | Reduce -1.8% | 86,845 | $6.8M |
| Martingale Asset Management L P | 0.17% | Reduce -0.3% | 85,530 | $6.7M |
| Hahn Capital Management LLC | 4.16% | Reduce -17.2% | 84,374 | $6.6M |
| HSBC Holdings PLC | 0.00% | Reduce -53.8% | 83,464 | $6.6M |
| Vest Financial, LLC | 0.08% | Add +16.6% | 82,571 | $6.5M |
"% of holder's portfolio" is SEIC's weight in each manager's 13F, not the share of Sei Investments Company the manager owns.