SEI INVESTMENTS COMPANY (SEIC) Institutional Shareholders
SEI INVESTMENTS COMPANY (SEIC) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $6.60B in SEIC holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of SEIC tracked by InsiderSet, reporting ownership valued at approximately $793.36M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $1.04B, representing an estimated gain of +31.23% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 57% of the total disclosed SEIC value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Loomis Sayles & Co L P, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in SEI INVESTMENTS COMPANY (SEIC).
This page ranks the largest institutional SEIC shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
560
Total Reported Value
$6.60B
Largest Holder
Blackrock, Inc.
Largest Position
$793.36M
Insider Transactions (90d)
16
Latest Filing Quarter
Q2 2026
New Institutional Positions
51
Funds Exiting Positions
1
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 10,110,337 | $793,358,144 | $1,041,162,504 | +$247,804,360 | +31.23% | |
| Loomis Sayles & Co L P | 0.91% | 8,628,879 | $677,108,102 | $888,601,959 | +$211,493,857 | +31.23% | |
| Vanguard Portfolio Management Llc | 0.03% | 6,125,643 | $480,679,206 | $630,818,716 | +$150,139,510 | +31.23% | |
| Morgan Stanley | 0.02% | 4,792,279 | $376,050,359 | $493,508,891 | +$117,458,532 | +31.23% | |
| Vanguard Capital Management Llc | 0.01% | 4,741,716 | $372,082,455 | $488,301,914 | +$116,219,459 | +31.23% | |
| State Street Corp | 0.01% | 4,185,178 | $328,410,918 | $430,989,630 | +$102,578,712 | +31.23% | |
| Bank Of America Corp | 0.02% | 2,920,506 | $229,172,087 | $300,753,708 | +$71,581,621 | +31.23% | |
| Geode Capital Management, Llc | 0.01% | 2,830,332 | $222,125,134 | $291,467,589 | +$69,342,455 | +31.22% | |
| Fmr Llc | 0.01% | 2,092,499 | $164,198,460 | $215,485,547 | +$51,287,087 | +31.23% | |
| Dimensional Fund Advisors Lp | 0.03% | 1,873,198 | $146,983,892 | $192,901,930 | +$45,918,038 | +31.24% | |
| First Trust Advisors Lp | 0.10% | 1,822,669 | $143,024,791 | $187,698,454 | +$44,673,663 | +31.23% | |
| Boston Partners | 0.15% | 1,770,039 | $138,887,658 | $182,278,616 | +$43,390,958 | +31.24% | |
| Caisse De Depot Et Placement Du Quebec | 0.15% | 1,198,089 | $94,014,044 | $123,379,205 | +$29,365,161 | +31.23% | |
| Invesco Ltd. | 0.01% | 1,145,404 | $89,879,852 | $117,953,704 | +$28,073,852 | +31.23% | |
| Boston Trust Walden Corp | 0.66% | 991,300 | $86,946,942 | $102,084,074 | +$15,137,132 | +17.41% | |
| Royce & Associates Lp | 0.77% | 996,456 | $78,191,902 | $102,615,039 | +$24,423,137 | +31.23% | |
| Franklin Resources Inc | 0.02% | 983,113 | $77,144,877 | $101,240,977 | +$24,096,100 | +31.23% | |
| Bank Of New York Mellon Corp | 0.01% | 936,302 | $73,471,656 | $96,420,380 | +$22,948,724 | +31.23% | |
| Northern Trust Corp | 0.01% | 905,607 | $71,062,981 | $93,259,409 | +$22,196,428 | +31.23% | |
| Ameriprise Financial Inc | 0.02% | 869,549 | $68,235,990 | $89,546,156 | +$21,310,166 | +31.23% | |
| Clark Capital Management Group, Inc. | 0.41% | 837,845 | $65,745,661 | $86,281,278 | +$20,535,617 | +31.23% | |
| American Capital Management Inc | 3.24% | 768,615 | $60,313,219 | $79,151,973 | +$18,838,754 | +31.23% | |
| Charles Schwab Investment Management Inc | 0.01% | 696,473 | $54,652,236 | $71,722,790 | +$17,070,554 | +31.23% | |
| Vanguard Fiduciary Trust Co | 0.01% | 590,060 | $46,302,008 | $60,764,379 | +$14,462,371 | +31.23% | |
| Raymond James Financial Inc | 0.01% | 572,163 | $44,897,586 | $58,921,346 | +$14,023,760 | +31.23% | |
| Arrowstreet Capital, Limited Partnership | 0.02% | 567,967 | $44,568,370 | $58,489,242 | +$13,920,872 | +31.23% | |
| First Financial Bankshares Inc | 0.88% | 554,178 | $43,486,348 | $57,069,250 | +$13,582,902 | +31.23% | |
| Pfa Pension, Forsikringsaktieselskab | 0.12% | 519,311 | $40,750,329 | $53,478,647 | +$12,728,318 | +31.23% | |
| Envestnet Asset Management Inc | 0.01% | 498,522 | $39,119,050 | $51,337,796 | +$12,218,746 | +31.23% | |
| Prana Capital Management, Lp | 1.12% | 464,241 | $36,428,991 | $47,807,538 | +$11,378,547 | +31.23% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.01% | 455,914 | $35,775,571 | $46,950,024 | +$11,174,453 | +31.23% | |
| Victory Capital Management Inc | 0.02% | 427,591 | $33,553,066 | $44,033,321 | +$10,480,255 | +31.23% | |
| Aqr Capital Management Llc | 0.02% | 420,042 | $32,960,717 | $43,255,925 | +$10,295,208 | +31.23% | |
| Royal Bank Of Canada | 0.01% | 416,356 | $32,671,000 | $42,876,341 | +$10,205,341 | +31.24% | |
| Voloridge Investment Management, Llc | 0.13% | 411,851 | $32,317,948 | $42,412,416 | +$10,094,468 | +31.23% | |
| Renaissance Technologies LLC | Jim Simons | 0.05% | 399,826 | $31,374,346 | $41,174,081 | +$9,799,735 | +31.23% |
| Quantinno Capital Management Lp | 0.05% | 382,361 | $30,003,885 | $39,375,536 | +$9,371,651 | +31.23% | |
| Barclays Plc | 0.01% | 380,977 | $29,895,267 | $39,233,011 | +$9,337,744 | +31.23% | |
| Storebrand Asset Management As | 0.01% | 498,484 | $28,773,320 | $51,333,882 | +$22,560,562 | +78.41% | |
| Man Group Plc | 0.06% | 360,910 | $28,320,608 | $37,166,512 | +$8,845,904 | +31.23% | |
| Arbejdsmarkedets Tillaegspension | 0.60% | 313,600 | $27,505,856 | $32,294,528 | +$4,788,672 | +17.41% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.06% | 342,515 | $26,877,152 | $35,272,195 | +$8,395,043 | +31.23% | |
| Goldman Sachs Group Inc | 0.00% | 324,129 | $25,434,436 | $33,378,804 | +$7,944,368 | +31.23% | |
| Ubs Group Ag | 0.00% | 316,605 | $24,843,994 | $32,603,983 | +$7,759,989 | +31.23% | |
| Rhumbline Advisers | 0.02% | 309,487 | $24,285,383 | $31,870,971 | +$7,585,588 | +31.24% | |
| Proshare Advisors Llc | 0.03% | 300,632 | $23,590,593 | $30,959,083 | +$7,368,490 | +31.23% | |
| Retirement Systems Of Alabama | 0.07% | 272,677 | $21,396,964 | $28,080,277 | +$6,683,313 | +31.23% | |
| Jlb & Associates Inc | 2.92% | 259,183 | $20,338,090 | $26,690,665 | +$6,352,575 | +31.23% | |
| Bridgewater Associates, Lp | 0.08% | 232,675 | $18,258,007 | $23,960,872 | +$5,702,865 | +31.23% | |
| Balyasny Asset Management L.P. | 0.03% | 225,674 | $17,708,639 | $23,239,909 | +$5,531,270 | +31.23% |
Frequently asked questions about SEIC
Who owns the most SEIC stock?
The largest holders of SEIC are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for SEI INVESTMENTS COMPANY (SEIC).
Is SEIC widely held by superinvestors?
Many widely followed stocks like SEIC appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly SEIC is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.