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MKTX · Marketaxess Holdings Inc · Shareholders & Ownership

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$164.66 +0.40 (+0.24%) At close · Oct 22
Market Cap
$5.78B
Shares
35.19M
Volume · Oct 22 1.85M Avg daily vol (3M) 1.1M

Every disclosed holder of MKTX 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 MKTX

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group Shares % Out
Institutional (13F) 38,791,510 110.23%
Insiders (Forms 3, 4, 5) 0 0.00%
13D/G-only blocks 0 0.00%
Remaining 3,598,619 -10.23%
Registered funds (N-PORT, not summed) 17,508,775 49.75%

Shares outstanding: 35,192,891, the issuer's latest cover-page count restated onto today's split basis.

Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

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 MKTX

# Holder Shares
1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
3,999,836
1.1
iShares Core S&P Small-Cap ETF
Fund S000004313 · Registered fund · Jun 30, 2026
iShares Trust, not summed
2,125,028
1.2
iShares S&P Small-Cap 600 Growth ETF
Fund S000004314 · Registered fund · Jun 30, 2026
iShares Trust, not summed
172,856
1.3
iShares S&P Small-Cap 600 Value ETF
Fund S000004316 · Registered fund · Jun 30, 2026
iShares Trust, not summed
140,605
1.4
iShares Russell Mid-Cap ETF
Fund S000004338 · Registered fund · Jun 30, 2026
iShares Trust, not summed
131,156
1.5
iShares Russell 1000 Value ETF
Fund S000004345 · Registered fund · Jun 30, 2026
iShares Trust, not summed
77,799
2
PRIMECAP MANAGEMENT CO/CA/
13F CIK 763212 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,504,905
2.1
PRIMECAP MANAGEMENT CO/CA/
13G CIK 763212 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
3,504,905
2.2
VANGUARD CAPITAL OPPORTUNITY FUND
Fund S000002594 · Registered fund · Jun 30, 2026
VANGUARD HORIZON FUNDS, not summed
1,833,050
2.3
PRIMECAP Odyssey Aggressive Growth Fund
Fund S000005541 · Registered fund · Jul 31, 2026
PRIMECAP Odyssey Funds, not summed
939,220
2.4
PRIMECAP Odyssey Growth Fund
Fund S000005540 · Registered fund · Jul 31, 2026
PRIMECAP Odyssey Funds, not summed
395,142
3
North Reef Capital Management LP
13F CIK 1867831 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,395,000
3.1
North Reef Capital Management LP
13G CIK 1867831 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
3,395,000
4
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,100,273
5
AQR CAPITAL MANAGEMENT LLC
13F CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,987,288
5.1
AQR CAPITAL MANAGEMENT LLC
13G CIK 1167557 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
1,987,288
5.2
AQR Long-Short Equity Fund
Fund S000041116 · Registered fund · Jun 30, 2026
AQR Funds, not summed
271,721
5.3
AQR Equity Market Neutral Fund
Fund S000046740 · Registered fund · Jun 30, 2026
AQR Funds, not summed
104,653
5.4
AQR Managed Futures Strategy HV Fund
Fund S000041117 · Registered fund · Jun 30, 2026
AQR Funds, not summed
30,271
5.5
AQR Multi-Asset Fund
Fund S000029959 · Registered fund · Jun 30, 2026
AQR Funds, not summed
22,471
6
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,546,670
7
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
1,404,998
7.1
Strategic Advisers Fidelity U.S. Total Stock Fund
Fund S000061481 · Registered fund · May 31, 2026
Fidelity Rutland Square Trust II, not summed
333,194
7.2
Fidelity Balanced Fund
Fund S000007151 · Registered fund · May 31, 2026
Fidelity Puritan Trust, not summed
250,183
7.3
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
192,128
7.4
Strategic Advisers U.S. Total Stock Fund
Fund S000084926 · Registered fund · May 31, 2026
Fidelity Rutland Square Trust II, not summed
138,766
7.5
Fidelity U.S. Equity Central Fund
Fund S000070098 · Registered fund · Jun 30, 2026
Fidelity Central Investment Portfolios LLC, not summed
133,747
8
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,281,769
8.1
State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF
Fund S000041317 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
327,235
8.2
State Street(R) SPDR(R) S & P 600(TM) Small Cap Growth ETF
Fund S000006990 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
110,437
8.3
State Street(R) SPDR(R) S & P 600(TM) Small Cap Value ETF
Fund S000006974 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
84,711
8.4
State Street(R) SPDR(R) S&P(R) Capital Markets ETF
Fund S000006978 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
57,595
8.5
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
11,900
9
NEUBERGER BERMAN GROUP LLC
13F CIK 1465109 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
1,229,929
9.1
Neuberger Genesis Fund
Fund S000007841 · Registered fund · May 31, 2026
NEUBERGER BERMAN EQUITY FUNDS, not summed
582,350
9.2
Neuberger Small-Mid Cap ETF
Fund S000084236 · Registered fund · May 31, 2026
Neuberger Berman ETF Trust, not summed
23,768
10
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,072,669
11
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
1,031,309
11.1
Goldman Sachs Large Cap Value Insights Fund
Fund S000009326 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
18,115
11.2
Goldman Sachs Rising Dividend Growth Fund
Fund S000036119 · Registered fund · Jul 31, 2026
GOLDMAN SACHS TRUST, not summed
11,515
11.3
Goldman Sachs U.S. Equity Insights Fund
Fund S000009327 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
2,480
11.4
Goldman Sachs Absolute Return Tracker Fund
Fund S000020314 · Registered fund · Jun 30, 2026
GOLDMAN SACHS TRUST, not summed
1,866
11.5
Goldman Sachs Variable Insurance Trust U.S. Equity Insights Fund
Fund S000009352 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
1,765
12
BANK OF MONTREAL /CAN/
13F CIK 927971 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,017,024
13
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
994,772
14
VAN ECK ASSOCIATES CORP
13F CIK 869178 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
924,617
14.1
VanEck Morningstar Wide Moat ETF
Fund S000036713 · Registered fund · Jun 30, 2026
VanEck ETF Trust, not summed
753,025
14.2
VanEck Morningstar SMID Moat ETF
Fund S000077508 · Registered fund · Jun 30, 2026
VanEck ETF Trust, not summed
11,362
14.3
VanEck Morningstar Wide Moat Fund
Fund S000059554 · Registered fund · Jun 30, 2026
VanEck Funds, not summed
2,335
14.4
VanEck Morningstar Global Wide Moat ETF
Fund S000063090 · Registered fund · Jun 30, 2026
VanEck ETF Trust, not summed
920
14.5
VanEck Morningstar Wide Moat Value ETF
Fund S000082154 · Registered fund · Jun 30, 2026
VanEck ETF Trust, not summed
310
15
VANGUARD SMALL-CAP INDEX FUND
Fund S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
773,354
16
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
597,894
16.1
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
80,448
16.2
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
78,022
16.3
U.S. Small Cap Growth Portfolio
Fund S000039439 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
42,667
16.4
U.S. CORE EQUITY 2 PORTFOLIO
Fund S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
28,173
16.5
U.S. CORE EQUITY 1 PORTFOLIO
Fund S000000979 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
26,420
17
NORGES BANK
13F CIK 1374170 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
572,422
18
McVey Richard M
Insider CIK 1296466 · Nov 14, 2024
Director, Executive Chairman, issuer-wide, not summed
564,029
19
TWO SIGMA INVESTMENTS, LP
13F CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
543,890
20
GUARDCAP ASSET MANAGEMENT Ltd
13F CIK 1732008 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
536,324
21
Azora Capital LP
13F CIK 1700272 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
513,081
22
Davis Asset Management, L.P.
13F CIK 1945894 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
500,000
23
CITADEL ADVISORS LLC
13F CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
481,689
24
JPMORGAN CHASE & CO
13F CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
438,001
25
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
422,864
25.1
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
57
26
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
407,626
27
LOS ANGELES CAPITAL MANAGEMENT LLC
13F CIK 1177206 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
392,065
28
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
330,815
28.1
Schwab U.S. Mid-Cap ETF
Fund S000026635 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
100,838
28.2
Schwab Fundamental U.S. Small Company ETF
Fund S000040878 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
56,636
28.3
Schwab U.S. Large-Cap ETF
Fund S000026632 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
38,841
28.4
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
22,013
28.5
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
21,622
29
Blackstone Alternative Multi-Strategy Fund
Fund S000045538 · Registered fund · Jun 30, 2026
Blackstone Alternative Investment Funds, not summed
326,024
30
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
303,517
31
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
278,745
32
Bank of New York Mellon Corp
13F CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
257,642
32.1
BNY Mellon US Mid Cap Core Equity ETF
Fund S000067261 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
5,079
33
RDST Capital LLC
13F CIK 1912187 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
247,112
34
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
246,521
34.1
Small Cap Core Fund
Fund S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
3,246
34.2
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
632
35
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
245,247
36
VANGUARD TAX-MANAGED SMALL-CAP FUND
Fund S000004387 · Registered fund · Jun 30, 2026
VANGUARD TAX-MANAGED FUNDS, not summed
236,057
37
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
223,656
38
VANGUARD SMALL-CAP GROWTH INDEX FUND
Fund S000002846 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
222,147
39
JPMorgan Small Cap Equity Fund
Fund S000002794 · Registered fund · Jun 30, 2026
JPMorgan Trust I, not summed
208,314
40
HRT FINANCIAL LP
13F CIK 1475597 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
205,854
41
BNP PARIBAS ASSET MANAGEMENT Holding S.A.
13F CIK 1520354 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
204,309
42
VICTORY CAPITAL MANAGEMENT INC
13F CIK 1040188 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
202,731
42.1
Victory RS Value Fund
Fund S000053562 · Registered fund · Jun 30, 2026
Victory Portfolios, not summed
49,360
42.2
Victory RS Large Cap Alpha Fund
Fund S000053560 · Registered fund · Jun 30, 2026
Victory Portfolios, not summed
44,650
42.3
Victory RS Investors Fund
Fund S000053583 · Registered fund · Jun 30, 2026
Victory Portfolios, not summed
21,780
42.4
Victory Sustainable World Fund
Fund S000012923 · Registered fund · May 31, 2026
Victory Portfolios III, not summed
10,900
42.5
Victory Extended Market Index Fund
Fund S000012941 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
4,072
43
VANGUARD DIVIDEND APPRECIATION INDEX FUND
Fund S000011322 · Registered fund · Jul 31, 2026
VANGUARD SPECIALIZED FUNDS, not summed
201,100
44
RENAISSANCE TECHNOLOGIES LLC
13F CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
200,000
45
Connor, Clark & Lunn Investment Management Ltd.
13F CIK 1596800 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
186,658
46
PRINCIPAL FINANCIAL GROUP INC
13F CIK 1126328 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
173,312
46.1
MidCap Value Fund I
Fund S000007173 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
103,978
46.2
SmallCap S&P 600 Index Fund
Fund S000007203 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
26,186
47
Freestone Grove Partners LP
13F CIK 2007591 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
172,799
48
Public Sector Pension Investment Board
13F CIK 1396318 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
157,338
49
Sone Capital Management, LLC
13F CIK 2026215 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
155,522
50
Nuveen, LLC
13F CIK 1871926 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
148,468
50.1
Nuveen ESG Small-Cap ETF
Fund S000055815 · Registered fund · Jul 31, 2026
NuShares ETF Trust, not summed
34,426
50.2
College Retirement Equities Fund - Total Global Stock Account
Fund S000005080 · Registered fund · Jun 30, 2026
College Retirement Equities Fund, not summed
33,287
50.3
Nuveen Equity Index Fund
Fund S000005360 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
30,637
50.4
Nuveen Quant Small/Mid Cap Equity Fund
Fund S000054623 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
21,630
50.5
Nuveen Large Cap Value Index Fund
Fund S000005388 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
12,181

92 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 569 holders

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Key facts CIK 1278021 CUSIP 57060D108 13F (30d) 55 filings 54 filers Visit website Investor relations