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SEIC · Sei Investments Co · Shareholders & Ownership

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$102.30 -2.21 (-2.11%) At close · Oct 23
Market Cap
$12.28B
Shares
120.02M
Volume · Oct 23 1.11M Avg daily vol (3M) 760.43K

Every disclosed holder of SEIC in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns SEIC

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions
Holder group Shares % Out
Institutional (13F) 90,404,011 75.32%
Insiders (Forms 3, 4, 5) 9,520,886 7.93%
13D/G-only blocks 0 0.00%
Remaining 20,094,285 16.74%
Registered funds (N-PORT, not summed) 45,099,113 37.58%

Shares outstanding: 120,019,182, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of SEIC

# Holder Shares
1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
9,927,545
1.1
iShares Core S&P Mid-Cap ETF
Fund S000004307 · Registered fund · Jun 30, 2026
iShares Trust, not summed
3,128,188
1.2
iShares Russell Mid-Cap ETF
Fund S000004338 · Registered fund · Jun 30, 2026
iShares Trust, not summed
417,672
1.3
iShares S&P Mid-Cap 400 Growth ETF
Fund S000004308 · Registered fund · Jun 30, 2026
iShares Trust, not summed
323,304
1.4
iShares Russell 1000 Value ETF
Fund S000004345 · Registered fund · Jun 30, 2026
iShares Trust, not summed
227,631
1.5
iShares S&P Mid-Cap 400 Value ETF
Fund S000004309 · Registered fund · Jun 30, 2026
iShares Trust, not summed
187,783
2
LOOMIS SAYLES & CO L P
13F CIK 312348 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
8,482,052
2.1
LOOMIS SAYLES & CO L P
13G CIK 312348 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(d), exempt investor, not summed
8,462,120
2.2
Loomis Sayles Growth Fund
Fund S000006699 · Registered fund · Jun 30, 2026
LOOMIS SAYLES FUNDS II, not summed
2,138,725
2.3
Loomis Sayles Global Growth Fund
Fund S000053353 · Registered fund · May 31, 2026
Natixis Funds Trust II, not summed
10,618
3
WEST ALFRED P JR
Insider CIK 1059374 · Sep 30, 2026
Insider, issuer-wide
6,784,574
4
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
6,140,822
5
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
4,686,241
6
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
4,251,584
6.1
State Street(R) SPDR(R) S&P(R) Dividend ETF
Fund S000006981 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
901,579
6.2
State Street(R) SPDR(R) Portfolio S&P 400(TM) Mid Cap ETF
Fund S000006986 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
462,683
6.3
State Street(R) SPDR(R) S & P 400(TM) Mid Cap Growth ETF
Fund S000006987 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
83,428
6.4
State Street(R) SPDR(R) S&P(R) Capital Markets ETF
Fund S000006978 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
75,629
6.5
State Street(R) SPDR(R) S & P 400(TM) Mid Cap Value ETF
Fund S000006988 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
57,432
7
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
4,119,203
7.1
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
41
8
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
3,435,336
9
Boston Partners
13F CIK 1386060 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,093,791
10
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,953,161
11
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
2,908,071
12
Eaton Vance Atlanta Capital SMID-Cap Fund
Fund S000005198 · Registered fund · Jun 30, 2026
Eaton Vance Growth Trust, not summed
2,713,727
13
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
2,510,218
13.1
Fidelity Low-Priced Stock Fund
Fund S000007152 · Registered fund · Jul 31, 2026
Fidelity Puritan Trust, not summed
892,010
13.2
Strategic Advisers Fidelity U.S. Total Stock Fund
Fund S000061481 · Registered fund · May 31, 2026
Fidelity Rutland Square Trust II, not summed
531,064
13.3
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
477,972
13.4
Strategic Advisers U.S. Total Stock Fund
Fund S000084926 · Registered fund · May 31, 2026
Fidelity Rutland Square Trust II, not summed
473,518
13.5
Fidelity Mid Cap Index Fund
Fund S000033637 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
385,372
14
VANGUARD SMALL-CAP INDEX FUND
Fund S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
2,483,119
15
LORD, ABBETT & CO. LLC
13F CIK 728100 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,309,004
15.1
LORD ABBETT AFFILIATED FUND INC
Fund S000006806 · Registered fund · Jul 31, 2026
LORD ABBETT AFFILIATED FUND INC, not summed
1,036,912
15.2
Lord Abbett Fundamental Equity Fund
Fund S000007138 · Registered fund · Jul 31, 2026
LORD ABBETT SECURITIES TRUST, not summed
471,006
15.3
Lord Abbett Value Opportunities Fund
Fund S000007144 · Registered fund · Jul 31, 2026
LORD ABBETT SECURITIES TRUST, not summed
308,978
15.4
LORD ABBETT MID CAP STOCK FUND INC
Fund S000001450 · Registered fund · Jun 30, 2026
LORD ABBETT MID CAP STOCK FUND INC, not summed
287,980
15.5
Growth and Income Portfolio
Fund S000007300 · Registered fund · Jun 30, 2026
LORD ABBETT SERIES FUND INC, not summed
107,371
16
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,962,762
16.1
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
331,411
16.2
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
274,160
16.3
Dimensional U.S. Core Equity 2 ETF
Fund S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
213,389
16.4
U.S. CORE EQUITY 1 PORTFOLIO
Fund S000000979 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
206,798
16.5
U.S. CORE EQUITY 2 PORTFOLIO
Fund S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
185,624
17
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,572,568
18
ROMEO CARMEN
Insider CIK 1191727 · Sep 1, 2026
Director, issuer-wide
1,560,293
19
FIRST TRUST ADVISORS LP
13F CIK 1125816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,501,972
19.1
First Trust Value Line Dividend Index Fund
Fund S000013817 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund, not summed
346,293
19.2
First Trust Financials AlphaDEX Fund
Fund S000017699 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
154,436
19.3
FT Vest SMID Rising Dividend Achievers Target Income ETF
Fund S000081275 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded Fund IV, not summed
65,008
19.4
First Trust/Dow Jones Dividend & Income Allocation Portfolio
Fund S000036417 · Registered fund · Jun 30, 2026
First Trust Variable Insurance Trust, not summed
31,075
19.5
First Trust Nasdaq BuyWrite Income ETF
Fund S000040305 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund VI, not summed
24,374
20
Beutel, Goodman & Co Ltd.
13F CIK 1361974 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,494,684
21
Invesco Ltd.
13F CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,110,829
21.1
Invesco S&P MidCap Quality ETF
Fund S000013108 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
790,021
21.2
Invesco Russell 1000 Dynamic Multifactor ETF
Fund S000064607 · Registered fund · May 31, 2026
Invesco Exchange-Traded Self-Indexed Fund Trust, not summed
140,902
21.3
Invesco S&P MidCap Low Volatility ETF
Fund S000030966 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
92,812
21.4
Invesco RAFI US 1000 ETF
Fund S000011995 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
25,042
21.5
Invesco S&P MidCap 400 Revenue ETF
Fund S000064595 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
13,568
22
ROYCE & ASSOCIATES LP
13F CIK 906304 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,050,287
22.1
Royce Premier Fund
Fund S000009505 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
361,661
22.2
Royce Small-Cap Fund
Fund S000009507 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
274,408
22.3
Royce SMid-Cap Total Return Fund
Fund S000009522 · Registered fund · Jun 30, 2026
ROYCE FUND, not summed
8,017
23
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,047,858
24
Caisse de depot et placement du Quebec
13F CIK 898286 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,002,445
25
Boston Trust Walden Corp
13F CIK 1534866 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
991,300
26
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
914,907
26.1
Mid Cap Index Fund
Fund S000001273 · Registered fund · Jun 30, 2026
Northern Funds, not summed
59,404
26.2
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
3,753
27
Bank of New York Mellon Corp
13F CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
894,194
27.1
BNY Mellon US Mid Cap Core Equity ETF
Fund S000067261 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
16,003
28
NORGES BANK
13F CIK 1374170 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
887,116
29
BARCLAYS PLC
13F CIK 312069 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
825,215
30
First Trust SMID Cap Rising Dividend Achievers ETF
Fund S000059604 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund VI, not summed
824,763
31
AMERICAN CAPITAL MANAGEMENT INC
13F CIK 1320168 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
745,323
32
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
695,446
32.1
Schwab U.S. Mid-Cap ETF
Fund S000026635 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
251,059
32.2
Schwab U.S. Large-Cap ETF
Fund S000026632 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
100,085
32.3
Schwab Fundamental U.S. Large Company ETF
Fund S000040877 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
68,176
32.4
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
54,833
32.5
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
54,638
33
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
13F CIK 1164508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
660,498
34
Clark Capital Management Group, Inc.
13F CIK 1352187 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
638,934
35
DORAN WILLIAM
Insider CIK 1191719 · Jun 9, 2026
Director, issuer-wide
618,802
36
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
592,612
37
RAYMOND JAMES FINANCIAL INC
13F CIK 720005 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
583,800
38
JANE STREET GROUP, LLC
13F CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
578,801
39
AMERIPRISE FINANCIAL INC
13F CIK 820027 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
578,420
39.1
Multi-Manager Large Cap Growth Strategies Fund
Fund S000091548 · Registered fund · Jun 30, 2026
COLUMBIA FUNDS SERIES TRUST I, not summed
187,644
39.2
Columbia Mid Cap Index Fund
Fund S000010826 · Registered fund · May 31, 2026
COLUMBIA FUNDS SERIES TRUST, not summed
66,352
39.3
Columbia Research Enhanced Core ETF
Fund S000066076 · Registered fund · Jul 31, 2026
Columbia ETF Trust I, not summed
31,478
39.4
Columbia Integrated Large Cap Growth Fund
Fund S000074120 · Registered fund · Feb 28, 2026
Columbia Funds Series Trust II, not summed
21,422
39.5
Columbia Integrated Large Cap Growth Fund II
Fund S000036204 · Registered fund · Jun 30, 2026
COLUMBIA FUNDS SERIES TRUST I, not summed
9,176
40
First Financial Bankshares Inc
13F CIK 36029 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
552,780
41
Quantinno Capital Management LP
13F CIK 1759654 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
532,381
42
VOLORIDGE INVESTMENT MANAGEMENT, LLC
13F CIK 1556921 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
518,314
43
VANGUARD DIVIDEND APPRECIATION INDEX FUND
Fund S000011322 · Registered fund · Jul 31, 2026
VANGUARD SPECIALIZED FUNDS, not summed
517,183
44
FRANKLIN RESOURCES INC
13F CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
512,826
44.1
Franklin Global Allocation Fund
Fund S000007241 · Registered fund · Jun 30, 2026
Franklin Fund Allocator Series, not summed
94,673
44.2
Franklin U.S. Mid Cap Multifactor Index ETF
Fund S000057201 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
66,780
44.3
Franklin U.S. Core Equity (IU) Fund
Fund S000066093 · Registered fund · Jul 31, 2026
Franklin Fund Allocator Series, not summed
31,257
44.4
Franklin U.S. Large Cap Multifactor Index ETF
Fund S000057200 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
23,188
45
ENVESTNET ASSET MANAGEMENT INC
13F CIK 1407543 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
478,365
46
NATIXIS ADVISORS, LLC
13F CIK 1018331 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
461,891
46.1
Natixis U.S. Equity Opportunities Fund
Fund S000006658 · Registered fund · Jun 30, 2026
Natixis Funds Trust I, not summed
71,863
47
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
461,227
47.1
Goldman Sachs Absolute Return Tracker Fund
Fund S000020314 · Registered fund · Aug 31, 2026
GOLDMAN SACHS TRUST, not summed
5,126
47.2
Goldman Sachs MarketBeta U.S. 1000 Equity ETF
Fund S000075322 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust II, not summed
3,156
47.3
Goldman Sachs MarketBeta(R) Russell 1000 Value Equity ETF
Fund S000083006 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
1,246
48
Azora Capital LP
13F CIK 1700272 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
443,189
49
Connor, Clark & Lunn Investment Management Ltd.
13F CIK 1596800 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
421,046
50
VANGUARD HIGH DIVIDEND YIELD INDEX FUND
Fund S000014011 · Registered fund · Jul 31, 2026
VANGUARD WHITEHALL FUNDS, not summed
409,254

93 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 803 holders

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Key facts CIK 350894 CUSIP 784117103 13F (30d) 134 filings 129 filers Visit website Investor relations