MARKETAXESS HOLDINGS INC - Common Stock, $0.003 par value (MKTX) Institutional Ownership

13F Institutional Holders and Ownership History from Q1 2014 to Q4 2025

Type / Class
Equity / Common Stock, $0.003 par value
Symbol
MKTX on Nasdaq
Shares outstanding
37,181,642
Price per share
$168.61
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
36,479,397
Total reported value
$6,611,251,878
% of total 13F portfolios
0.01%
Share change
+3,453,861
Value change
+$632,096,471
Number of holders
475
Price from insider filings
$168.61
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of MARKETAXESS HOLDINGS INC - Common Stock, $0.003 par value (MKTX) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
BlackRock, Inc. 11% +10% $731,260,235 +$64,142,960 4,034,537 +9.6% BlackRock, Inc. 31 Jan 2026
VANGUARD GROUP INC 10% $671,615,408 3,854,312 The Vanguard Group 30 Sep 2025
PRIMECAP MANAGEMENT CO/CA/ 8.5% +43% $575,545,781 +$171,250,438 3,175,425 +42% PRIMECAP MANAGEMENT CO/CA/ 31 Dec 2025
AQR CAPITAL MANAGEMENT LLC 6.9% $463,655,081 2,558,097 AQR Capital Management, LLC 31 Dec 2025
FMR LLC 6.1% $496,084,646 2,296,157 FMR LLC 30 Jun 2025
GUARDIAN CAPITAL LP 4.8% $391,918,458 1,789,582 Guardian Capital LP 31 Dec 2024
T. Rowe Price Investment Management, Inc. 3.7% $238,843,567 1,370,694 T. Rowe Price Investment Management, Inc. 30 Sep 2025

As of 31 Dec 2025, 475 institutional investors reported holding 36,479,397 shares of MARKETAXESS HOLDINGS INC - Common Stock, $0.003 par value (MKTX). This represents 98% of the company’s total 37,181,642 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of MARKETAXESS HOLDINGS INC - Common Stock, $0.003 par value (MKTX) together control 77% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
VANGUARD GROUP INC 10% 3,839,889 -0.37% 0.01% $695,979,882
BlackRock, Inc. 10% 3,746,472 +102% 0.01% $679,048,052
PRIMECAP MANAGEMENT CO/CA/ 8.5% 3,175,425 +42% 0.44% $575,545,786
AQR CAPITAL MANAGEMENT LLC 6.9% 2,558,097 +169% 0.24% $463,655,158
FMR LLC 5.4% 2,004,625 -6.5% 0.02% $363,338,135
North Reef Capital Management LP 4.3% 1,609,330 +77% 12% $291,691,062
STATE STREET CORP 3.4% 1,248,314 -5.5% 0.01% $226,256,913
VAN ECK ASSOCIATES CORP 3.3% 1,214,967 -38% 0.18% $220,212,000
GUARDCAP ASSET MANAGEMENT Ltd 3.1% 1,153,578 -15% 5.6% $208,976,430
BANK OF MONTREAL /CAN/ 2.6% 951,024 +5086% 0.07% $172,373,029
GEODE CAPITAL MANAGEMENT, LLC 2.2% 833,067 +0.25% 0.01% $151,018,471
CITADEL ADVISORS LLC 1.7% 625,208 +102% 0.08% $113,318,950
NEUBERGER BERMAN GROUP LLC 1.5% 549,639 +26504% 0.07% $99,622,069
JPMORGAN CHASE & CO 1.5% 545,364 +22% 0.01% $98,847,267
Findlay Park Partners LLP 1.4% 536,400 -17% 1.2% $97,222,500
TWO SIGMA INVESTMENTS, LP 1.4% 533,527 +46% 0.14% $96,701,769
DIMENSIONAL FUND ADVISORS LP 1.4% 526,981 +1.1% 0.02% $95,517,982
NORGES BANK 1.4% 503,855 0.01% $91,323,719
MORGAN STANLEY 1.1% 424,877 -23% 0% $77,009,309
BNP PARIBAS FINANCIAL MARKETS 1% 375,735 0% 0.04% $68,101,969
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.86% 318,386 +1% 0.01% $57,707,463
RDST Capital LLC 0.84% 310,697 +10% 5.3% $56,313,831
MILLENNIUM MANAGEMENT LLC 0.81% 301,665 -50% 0.04% $54,676,781
Bank of New York Mellon Corp 0.8% 298,728 -21% 0.01% $54,144,376
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.78% 288,742 +11% 0.03% $52,334,488

Institutional Holders of MARKETAXESS HOLDINGS INC - Common Stock, $0.003 par value (MKTX) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 36,479,397 $6,611,251,878 +$632,096,471 $181.25 475
2025 Q3 35,600,561 $6,209,467,198 -$372,238,236 $174.25 445
2025 Q2 36,906,141 $8,238,737,302 +$69,030,421 $223.34 521
2025 Q1 36,701,934 $7,939,928,818 -$208,135,992 $216.35 504
2024 Q4 37,663,830 $8,512,050,353 +$221,536,894 $226.04 509
2024 Q3 36,519,858 $9,415,565,593 -$161,265,493 $256.20 501
2024 Q2 37,293,324 $7,475,569,215 +$35,784,043 $200.53 459
2024 Q1 37,079,883 $8,122,848,140 -$65,308,486 $219.25 452
2023 Q4 37,167,496 $10,873,714,480 -$1,710,577 $292.85 494
2023 Q3 37,345,565 $7,982,666,093 -$87,422,762 $213.64 473
2023 Q2 37,477,705 $9,792,813,093 +$133,215,305 $261.42 504
2023 Q1 37,103,081 $14,499,895,648 +$181,992,782 $391.29 524
2022 Q4 36,918,316 $10,309,138,894 +$25,191,506 $278.89 496
2022 Q3 36,769,971 $8,187,933,057 -$371,359,929 $222.49 458
2022 Q2 36,145,484 $9,253,392,614 -$43,291,057 $256.01 486
2022 Q1 36,324,543 $12,346,248,196 -$96,523,408 $340.20 491
2021 Q4 36,565,850 $15,012,441,196 -$431,434,922 $411.27 500
2021 Q3 36,493,671 $15,332,316,477 +$98,880,935 $420.69 499
2021 Q2 36,191,606 $16,753,698,372 +$549,457,628 $463.59 538
2021 Q1 35,616,372 $17,728,743,398 +$172,602,984 $497.92 574
2020 Q4 35,377,646 $20,153,555,590 +$247,364,250 $570.56 591
2020 Q3 34,854,950 $16,777,482,054 -$86,311,113 $481.59 550
2020 Q2 35,015,026 $17,543,388,003 -$342,712,390 $500.92 550
2020 Q1 35,750,274 $11,893,744,460 -$284,917,353 $332.57 461
2019 Q4 36,587,948 $13,862,385,897 -$57,400,135 $379.11 494
2019 Q3 36,696,332 $12,015,245,050 -$473,002,822 $327.50 450
2019 Q2 38,137,349 $12,254,614,671 -$119,940,774 $321.42 410
2019 Q1 38,830,575 $9,555,780,176 +$194,322,504 $246.08 339
2018 Q4 38,083,705 $8,044,897,019 +$87,995,089 $211.31 343
2018 Q3 37,678,828 $6,721,620,339 +$10,308,763 $178.49 305
2018 Q2 37,586,678 $7,439,397,589 +$4,771,023 $197.86 311
2018 Q1 37,548,096 $8,162,995,116 +$142,092,511 $217.44 318
2017 Q4 37,092,840 $7,483,018,904 +$427,852,392 $201.75 319
2017 Q3 34,843,099 $6,428,666,243 +$96,877,377 $184.51 309
2017 Q2 34,630,947 $6,964,267,154 +$264,298,298 $201.10 330
2017 Q1 34,051,990 $6,385,359,016 +$584,796,982 $187.49 324
2016 Q4 33,826,702 $4,970,423,446 -$74,090,061 $146.92 315
2016 Q3 34,184,542 $5,657,518,589 -$103,588,959 $165.59 304
2016 Q2 35,090,751 $5,102,553,126 -$109,320,540 $145.40 289
2016 Q1 36,175,647 $4,515,352,760 +$6,046,678 $124.83 260
2015 Q4 36,390,171 $4,059,324,455 +$50,937,749 $111.59 238
2015 Q3 36,053,292 $3,347,889,543 +$38,273,765 $92.88 225
2015 Q2 35,718,536 $3,313,563,026 +$31,692,794 $92.77 222
2015 Q1 35,122,126 $2,911,041,940 -$38,050,146 $82.90 203
2014 Q4 36,014,919 $2,582,933,526 -$46,256,629 $71.71 189
2014 Q3 37,102,099 $2,295,130,768 +$19,416,445 $61.86 177
2014 Q2 36,924,915 $1,996,152,389 +$80,211,864 $54.06 174
2014 Q1 35,360,779 $2,093,031,283 +$25,110,185 $59.22 187