Sei Investments CompanySEIC
13F holders, Q3 2025 (September 30)549holders −15
58new positions
65sold out
8famous investors
$84.80avg. 13F price*
At the end of Q3 2025, 549 institutions reported holding Sei Investments Company (SEIC) in their 13F filings, down 15 from Q2 2025. 58 opened new positions and 65 sold out. The largest holders were Vanguard Group Inc. ($955.5M), BlackRock, Inc. ($785.9M) and Loomis Sayles & Co. L P ($761.6M). 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 Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Sei Investments Company
- CUSIP
- 784117103
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 58 | $53.4M |
| Exits | 65 | $197.7M |
All 13F filers, Q2 2025 → Q3 2025: 5,588,449 shares bought and 6,370,518 shares sold, net −782,069 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 549 holders
| Vanguard Group Inc. | 0.01% | Add +0.3% | 11,260,591 | $955.5M |
| BlackRock, Inc. | 0.01% | Add +0.7% | 9,262,602 | $785.9M |
| Loomis Sayles & Co. L P | 0.91% | Add +1.5% | 8,976,049 | $761.6M |
| Morgan Stanley | 0.03% | Reduce -0.7% | 5,593,742 | $474.6M |
| State Street Corp. | 0.01% | Reduce -4.4% | 4,536,582 | $384.9M |
| Bank of America Corp. | 0.02% | Reduce -1.3% | 3,121,067 | $264.8M |
| Geode Capital Management, LLC | 0.02% | Add +8.1% | 2,784,343 | $236.3M |
| Beutel, Goodman & Co Ltd. | 1.03% | Reduce -22.2% | 2,022,950 | $171.6M |
| Dimensional Fund Advisors LP | 0.03% | Add +1.8% | 1,863,052 | $158.1M |
| Invesco Ltd. | 0.02% | Add +4.1% | 1,731,523 | $146.9M |
| First Trust Advisors LP | 0.11% | Reduce -0.1% | 1,725,019 | $146.4M |
| Lord, Abbett & Co. LLC | 0.42% | Add +8.5% | 1,608,382 | $136.5M |
| FMR LLC | 0.01% | Add +61.0% | 1,349,630 | $114.5M |
| Caisse de depot et placement du Quebec | 0.21% | Add +31.0% | 1,343,757 | $114.0M |
| Boston Trust Walden Corp | 0.69% | Reduce -19.3% | 1,105,409 | $93.8M |
| Bank of New York Mellon Corp | 0.02% | Reduce -0.6% | 1,013,911 | $86.0M |
| Royal Bank of Canada | 0.01% | Reduce -15.3% | 951,082 | $80.7M |
| Northern Trust Corp. | 0.01% | Add +0.9% | 922,620 | $78.3M |
| Royce & Associates LP | 0.76% | Reduce -26.3% | 903,583 | $76.7M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.02% | Add +2.6% | 883,753 | $75.0M |
| Ameriprise Financial Inc. | 0.02% | Add +37.2% | 815,694 | $69.2M |
| Qube Research & Technologies Ltd | 0.09% | Add +82.5% | 766,775 | $65.1M |
| Prana Capital Management, LP | 2.01% | Add +60.8% | 711,311 | $60.4M |
| Charles Schwab Investment Management Inc. | 0.01% | Reduce -0.6% | 662,458 | $56.2M |
| Millennium Management | 0.05% | Add +12.8% | 655,689 | $55.6M |
| Franklin Resources Inc. | 0.01% | Add +17.1% | 638,486 | $54.2M |
| American Capital Management Inc. | 1.91% | Add +21.9% | 565,117 | $48.0M |
| Raymond James Financial Inc. | 0.01% | Reduce -2.6% | 528,314 | $44.8M |
| Natixis Advisors, LLC | 0.06% | Reduce -3.5% | 511,066 | $43.4M |
| AQR Capital Management | 0.03% | Add +19.1% | 467,344 | $39.7M |
| UBS Group AG | 0.01% | Add +16.4% | 443,722 | $37.6M |
| Voloridge Investment Management, LLC | 0.12% | Add +42.2% | 406,237 | $34.5M |
| ProShare Advisors LLC | 0.07% | Reduce -13.8% | 389,621 | $33.1M |
| Renaissance Technologies | 0.04% | Reduce -8.3% | 386,926 | $32.8M |
| JPMorgan Chase & Co. | 0.00% | Add +2.5% | 381,134 | $32.3M |
| Envestnet Asset Management Inc. | 0.01% | Add +1.5% | 361,436 | $30.7M |
| Arrowstreet Capital, Limited Partnership | 0.02% | Reduce -10.0% | 329,970 | $28.0M |
| Rhumbline Advisers | 0.02% | Add +3.1% | 326,240 | $27.7M |
| Man Group plc | 0.05% | Add +40.9% | 314,194 | $26.7M |
| Retirement Systems of Alabama | 0.08% | Add +5.5% | 289,851 | $24.6M |
| Jupiter Asset Management Ltd. | 0.20% | Reduce -33.5% | 277,462 | $23.5M |
| JLB & Associates Inc. | 2.97% | Reduce -0.6% | 266,544 | $22.6M |
| Bridgewater Associates | 0.09% | Add +102.6% | 262,502 | $22.3M |
| Thrivent Financial for Lutherans | 0.04% | Add +141.8% | 252,231 | $21.4M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -43.3% | 240,350 | $20.4M |
| Alps Advisors Inc. | 0.11% | Reduce -14.5% | 236,376 | $20.1M |
| Nuveen, LLC | 0.01% | Reduce -0.3% | 236,113 | $20.0M |
| Legal & General Group Plc | 0.00% | Reduce -4.8% | 229,985 | $19.5M |
| Martingale Asset Management L P | 0.46% | Reduce -4.9% | 216,904 | $18.4M |
| Principal Financial Group Inc. | 0.01% | Reduce -2.8% | 208,988 | $17.7M |
| Citadel Advisors | 0.01% | Add +2.0% | 206,698 | $17.5M |
| Swiss National Bank | 0.01% | Add +0.5% | 205,100 | $17.4M |
| Interval Partners, LP | 0.37% | Reduce -11.3% | 203,914 | $17.3M |
| Leith Wheeler Investment Counsel Ltd. | 1.17% | Add +1.4% | 203,305 | $17.3M |
| California Public Employees Retirement System | 0.01% | Add +11.6% | 199,122 | $16.9M |
| State of Alaska, Department of Revenue | 0.17% | Reduce -0.3% | 198,116 | $16.8M |
| Los Angeles Capital Management LLC | 0.06% | Add +175.5% | 194,201 | $16.5M |
| Public Employees Retirement Association of Colorado | 0.06% | Add +4204.8% | 178,435 | $15.1M |
| Vestcor Inc | 0.44% | Reduce -0.1% | 174,337 | $14.8M |
| Allianz Asset Management GmbH | 0.02% | Add +21.1% | 174,266 | $14.8M |
| Markel Group | 0.12% | No change | 173,200 | $14.7M |
| Brandywine Global Investment Management, LLC | 0.10% | Add +7.6% | 166,317 | $14.1M |
| Foyston, Gordon & Payne Inc | 2.88% | Add +2.7% | 155,513 | $13.2M |
| Barclays PLC | 0.00% | Add +0.9% | 155,403 | $13.2M |
| Schonfeld Strategic Advisors LLC | 0.09% | Add +8.1% | 155,388 | $13.2M |
| Quantinno Capital Management LP | 0.04% | Add +47.5% | 151,920 | $12.9M |
| Osaic Holdings, Inc. | 0.02% | Add +3.3% | 144,219 | $12.7M |
| Janney Montgomery Scott LLC | 0.03% | Add +2.8% | 139,287 | $11.8M |
| Victory Capital Management Inc. | 0.01% | Reduce -12.0% | 135,162 | $11.5M |
| Robeco Institutional Asset Management B.V. | 0.02% | Add +70.0% | 131,252 | $11.1M |
| Alliancebernstein L.P. | 0.00% | Add +2.7% | 129,975 | $11.0M |
| KLP Kapitalforvaltning As | 0.04% | Reduce -18.4% | 126,900 | $10.8M |
| State Board of Administration of Florida Retirement System | 0.02% | Reduce -9.0% | 124,830 | $10.6M |
| King Luther Capital Management Corp. | 0.04% | Reduce -9.8% | 124,726 | $10.6M |
| M&G PLC | 0.06% | New | 122,508 | $10.4M |
| Rockefeller Capital Management L.P. | 0.02% | Add +19.8% | 119,886 | $10.2M |
| Wells Fargo & Company | 0.00% | Add +25.0% | 119,567 | $10.1M |
| New York State Teachers Retirement System | 0.02% | Reduce -1.1% | 116,155 | $9.9M |
| LPL Financial LLC | 0.00% | Add +13.6% | 112,555 | $9.6M |
| American Century Companies Inc. | 0.00% | Reduce -3.5% | 112,137 | $9.5M |
| TD Asset Management Inc | 0.01% | Reduce -11.5% | 111,238 | $9.4M |
| Jane Street Group, LLC | 0.01% | Reduce -70.8% | 110,316 | $9.4M |
| Acadian Asset Management LLC | 0.02% | Add +4.3% | 109,183 | $9.3M |
| Truist Financial Corp. | 0.01% | Reduce -5.7% | 108,625 | $9.2M |
| Hahn Capital Management LLC | 4.41% | Reduce -4.3% | 108,367 | $9.2M |
| Bank of Montreal | 0.00% | Reduce -12.5% | 107,664 | $9.1M |
| Tidal Investments LLC | 0.04% | Add +25.0% | 105,187 | $8.9M |
| Teacher Retirement System of Texas | 0.03% | Add +8.0% | 102,295 | $8.7M |
| Van Eck Associates Corp. | 0.01% | Reduce -25.3% | 101,009 | $8.6M |
| Schroder Investment Management Group | 0.01% | Add +15.7% | 99,697 | $8.5M |
| California State Teachers Retirement System | 0.01% | Reduce -5.3% | 99,225 | $8.4M |
| Engineers Gate Manager LP | 0.09% | Add +11.4% | 97,094 | $8.2M |
| Capital Fund Management S.A. | 0.08% | Add +100.2% | 95,285 | $8.1M |
| Kathmere Capital Management, LLC | 0.56% | Add +25.7% | 93,022 | $7.9M |
| Russell Investments Group, Ltd. | 0.01% | Reduce -36.7% | 91,796 | $7.8M |
| Balyasny Asset Management L.P. | 0.02% | New | 88,345 | $7.5M |
| State of Wisconsin Investment Board | 0.02% | Reduce -7.3% | 85,681 | $7.3M |
| Thrive Wealth Management, LLC | 1.02% | Add +104.2% | 79,296 | $6.7M |
| Chevy Chase Trust Holdings, LLC | 0.02% | Reduce -1.0% | 78,235 | $6.6M |
| T. Rowe Price Associates Inc. | 0.00% | Add +7.7% | 77,852 | $6.6M |
"% of holder's portfolio" is SEIC's weight in each manager's 13F, not the share of Sei Investments Company the manager owns.