MKTX · Marketaxess Holdings Inc · Shareholders & Ownership
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 positionsNo 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 | As of | Notes |
|---|---|---|---|---|
| 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 |
|
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 |
|
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 |
|
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
Create a free account to page through every holder, filter by source and group by ultimate parent.