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Equibles

SEIC

Sei Investments Co

Company with tickers: SEIC

CIK
350894
CUSIP
784117103
Shares Outstanding
120,272,976
13F Activity (30d)
313 filings 286 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 566
Total Value: $7,072,940,765
Total Shares: 90,135,608
Showing 1–100 of 571 holdings by value · page 1 of 6

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 566 13F filers · Δ vs Dec 31, 2025
Top Holder
11.2%
Jun 2023 → Mar 2026 · range 11.2% – 13.0%
−1.2 pts
Top 5
38.2%
Jun 2023 → Mar 2026 · range 38.2% – 49.2%
−5.4 pts
Top 10
54.0%
Jun 2023 → Mar 2026 · range 54.0% – 62.5%
−2.5 pts
HHI
409
Jun 2023 → Mar 2026 · range 409 – 583
Broadly held −78

Quarterly Activity

vs Dec 31, 2025
New
74
Increased
218
Decreased
176
Sold Out
69
Unchanged
98
Holder count: +5
Institutional value: -3.2%
Shares held: +1.2%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega FMR LLC +749,325 2,092,499
Mega BlackRock, Inc. +472,497 10,110,337
Large LORD, ABBETT & CO. LLC +287,009 2,204,379
Large Quantinno Capital Management LP +277,771 382,361
Mid AMERICAN CAPITAL MANAGEMENT INC +193,796 768,615

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega Invesco Ltd. −586,980 1,145,404
Large Qube Research & Technologies Ltd −438,220 124,992
Mega UBS Group AG −319,587 316,605
Mega MORGAN STANLEY −282,899 4,792,279
Mega MILLENNIUM MANAGEMENT LLC −252,870 118,765

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 6,125,643 $480,679,206
Mega VANGUARD CAPITAL MANAGEMENT LLC 4,741,716 $372,082,454
Large Boston Partners 1,770,039 $138,894,959
Mega VANGUARD FIDUCIARY TRUST CO 590,060 $46,302,008
Mid First Financial Bankshares Inc 554,178 $43,486,347

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 11,071,365 $908,073,354
Mega NORGES BANK 652,868 $53,548,233
Mid Azora Capital LP 216,465 $17,754,459
Large Brandywine Global Investment Management, LLC 179,610 $14,731,612
Large M&G PLC 134,004 $10,991,008
Filter: New 74 Increased 218 Reduced 176 Sold out 69 Unchanged 98
Showing 100 of 571
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $793,358,137 11.22% 10,110,337
Large LOOMIS SAYLES & CO L P $677,108,134 9.57% 8,628,879
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $480,679,206 6.80% 6,125,643
Mega MORGAN STANLEY $376,050,127 5.32% 4,792,279
Mega VANGUARD CAPITAL MANAGEMENT LLC $372,082,454 5.26% 4,741,716
Mega STATE STREET CORP $328,410,917 4.64% 4,185,178
Mega BANK OF AMERICA CORP /DE/ Bank $229,172,104 3.24% 2,920,506
Mega GEODE CAPITAL MANAGEMENT, LLC $222,096,151 3.14% 2,830,332
Large LORD, ABBETT & CO. LLC $172,977,620 2.45% 2,204,379
Mega FMR LLC $164,198,395 2.32% 2,092,499
Mega DIMENSIONAL FUND ADVISORS LP $146,989,845 2.08% 1,873,198
Mega FIRST TRUST ADVISORS LP $143,024,835 2.02% 1,822,669
Large Beutel, Goodman & Co Ltd. $139,139,394 1.97% 1,773,154
Large Boston Partners $138,894,959 1.96% 1,770,039
Large Caisse de depot et placement du Quebec $94,014,043 1.33% 1,198,089
Mega Invesco Ltd. $89,879,846 1.27% 1,145,404
Large Boston Trust Walden Corp $81,587,691 1.15% 1,039,731
Mid ROYCE & ASSOCIATES LP $78,191,902 1.11% 996,456
Mega FRANKLIN RESOURCES INC $77,144,873 1.09% 983,113
Mega Bank of New York Mellon Corp Bank $73,471,610 1.04% 936,302
Mega NORTHERN TRUST CORP Bank $71,062,978 1.00% 905,607
Mega AMERIPRISE FINANCIAL INC $68,233,509 0.96% 869,549
Large Clark Capital Management Group, Inc. $65,745,697 0.93% 837,845
Mid AMERICAN CAPITAL MANAGEMENT INC $60,313,219 0.85% 768,615
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $54,652,236 0.77% 696,473
Mega VANGUARD FIDUCIARY TRUST CO Bank $46,302,008 0.65% 590,060
Mega RAYMOND JAMES FINANCIAL INC $44,897,629 0.63% 572,163
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP $44,568,370 0.63% 567,967
Mid First Financial Bankshares Inc $43,486,347 0.61% 554,178
Large PFA Pension, Forsikringsaktieselskab Pension $40,750,334 0.58% 519,311
Mega ENVESTNET ASSET MANAGEMENT INC $39,119,021 0.55% 498,522
Large NATIXIS ADVISORS, LLC $36,870,228 0.52% 469,864
Mid Prana Capital Management, LP $36,428,991 0.52% 464,241
Mega JPMORGAN CHASE & CO $36,226,456 0.51% 461,660
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $35,775,566 0.51% 455,914
Mega VICTORY CAPITAL MANAGEMENT INC $33,553,065 0.47% 427,591
Mega AQR CAPITAL MANAGEMENT LLC $32,960,692 0.47% 420,042
Mega ROYAL BANK OF CANADA Bank $32,694,523 0.46% 416,650
Large VOLORIDGE INVESTMENT MANAGEMENT, LLC $32,317,947 0.46% 411,851
Large RENAISSANCE TECHNOLOGIES LLC $31,374,346 0.44% 399,826
Large Quantinno Capital Management LP $30,003,867 0.42% 382,361
Mega BARCLAYS PLC $29,895,263 0.42% 380,977
Large Man Group plc $28,320,606 0.40% 360,910
Large Connor, Clark & Lunn Investment Management Ltd. $26,877,152 0.38% 342,515
Large Thrivent Financial for Lutherans $25,548,889 0.36% 325,588
Mega GOLDMAN SACHS GROUP INC $25,434,402 0.36% 324,129
Mid Arbejdsmarkedets Tillaegspension Pension $25,378,610 0.36% 323,418
Mega UBS Group AG $24,843,993 0.35% 316,605
Mega RHUMBLINE ADVISERS $24,285,444 0.34% 309,487
Large ProShare Advisors LLC $23,590,593 0.33% 300,632
Large Retirement Systems of Alabama Pension $21,396,964 0.30% 272,677
Small JLB & ASSOCIATES INC $20,338,090 0.29% 259,183
Large Bridgewater Associates, LP $18,258,007 0.26% 232,675
Large Balyasny Asset Management L.P. $17,708,638 0.25% 225,674
Large PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO Pension $17,234,758 0.24% 219,635
Large ALPS ADVISORS INC $16,784,105 0.24% 213,892
Mega PRINCIPAL FINANCIAL GROUP INC $16,297,276 0.23% 207,688
Mega Swiss National Bank Bank $16,156,973 0.23% 205,900
Mega California Public Employees Retirement System Pension $15,573,862 0.22% 198,469
Small Leith Wheeler Investment Counsel Ltd. $15,399,659 0.22% 196,249
Mid Crestwood Advisors Group, LLC $15,396,834 0.22% 196,213
Mega Legal & General Group Plc $14,797,244 0.21% 188,572
Mega Amundi $14,796,537 0.21% 188,563
Mega Nuveen, LLC $13,748,806 0.19% 175,211
Mid Markel Group Inc. $13,591,004 0.19% 173,200
Mega LPL Financial LLC $13,089,973 0.19% 166,815
Large Tidal Investments LLC $12,672,355 0.18% 161,493
Small Foyston, Gordon & Payne Inc $12,381,545 0.18% 157,787
Large Rockefeller Capital Management L.P. $11,971,773 0.17% 152,565
Large OSAIC HOLDINGS, INC. $11,902,484 0.17% 151,682
Mid Interval Partners, LP $10,689,732 0.15% 136,227
Large Janney Montgomery Scott LLC $10,429,290 0.15% 132,908
Large KLP KAPITALFORVALTNING AS $10,028,466 0.14% 127,800
Mega ALLIANCEBERNSTEIN L.P. $9,924,571 0.14% 126,476
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $9,876,705 0.14% 125,866
Large Qube Research & Technologies Ltd $9,808,122 0.14% 124,992
Mega MILLENNIUM MANAGEMENT LLC $9,319,489 0.13% 118,765
Large Creative Planning $9,167,414 0.13% 116,827
Mega BANK OF MONTREAL /CAN/ Bank $8,895,906 0.13% 113,367
Mega WELLS FARGO & COMPANY/MN $8,829,364 0.12% 112,519
Mid Vestcor Inc $8,758,664 0.12% 111,618
Large TRUIST FINANCIAL CORP $8,683,960 0.12% 110,666
Large KING LUTHER CAPITAL MANAGEMENT CORP $8,582,263 0.12% 109,370
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Pension $8,560,370 0.12% 109,091
Large NEW YORK STATE TEACHERS RETIREMENT SYSTEM Pension $8,520,586 0.12% 108,584
Mega TD Asset Management Inc $8,439,919 0.12% 107,556
Mega VAN ECK ASSOCIATES CORP $8,335,083 0.12% 106,220
Large Robeco Institutional Asset Management B.V. $8,221,615 0.12% 104,774
Large TEACHER RETIREMENT SYSTEM OF TEXAS Pension $8,101,321 0.11% 103,241
Large STIFEL FINANCIAL CORP $7,942,575 0.11% 101,218
Small Kathmere Capital Management, LLC $7,806,587 0.11% 99,485
Mega AMERICAN CENTURY COMPANIES INC $7,472,698 0.11% 95,230
Large Corient Private Wealth LLC $7,241,839 0.10% 92,288
Mega PRICE T ROWE ASSOCIATES INC /MD/ $7,210,059 0.10% 91,883
Mega VANGUARD ASSET MANAGEMENT, Ltd $7,065,909 0.10% 90,046
Large STATE OF WISCONSIN INVESTMENT BOARD $6,814,727 0.10% 86,845
Mid MARTINGALE ASSET MANAGEMENT L P $6,711,539 0.09% 85,530
Small HAHN CAPITAL MANAGEMENT LLC $6,620,827 0.09% 84,374
Mega HSBC HOLDINGS PLC $6,549,418 0.09% 83,464
Mid Vest Financial, LLC $6,479,346 0.09% 82,571

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