MarketAxess Holdings Inc.
US ˙ NasdaqGS ˙ US57060D1081

SecurityMKTX / MarketAxess Holdings Inc.
InstitutionState Street Corp
Latest Disclosed Ownership1,280,857 shares
Latest Disclosed Value $ 211,315,788
State Street Corp reports 2.61% increase in ownership of MKTX / MarketAxess Holdings Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,280,857 shares of MarketAxess Holdings Inc. (US:MKTX) valued at $211,315,788 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,248,314 shares of MarketAxess Holdings Inc.. This represents a change in shares of 2.61% during the quarter. The current value of the position is $154,496,971 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F MARKETAXESS HLDGS COM 57060D108 1,280,857 32,543 2.61 211,316 -6.60 0.0073
2026-02-13 2025-12-31 13F MARKETAXESS HLDGS COM 57060D108 1,248,314 -72,343 -5.48 226,257 -1.68 0.0076
2025-11-14 2025-09-30 13F MARKETAXESS HLDGS COM 57060D108 1,320,657 -212,039 -13.83 230,124 -32.77 0.0080
2025-08-14 2025-06-30 13F MARKETAXESS HLDGS COM 57060D108 1,532,696 67,290 4.59 342,312 7.97 0.0128
2025-05-15 2025-03-31 13F MARKETAXESS HLDGS COM 57060D108 1,465,406 -164,105 -10.07 317,041 -13.92 0.0131
2025-02-14 2024-12-31 13F MARKETAXESS HLDGS COM 57060D108 1,629,511 49,608 3.14 368,327 -9.00 0.0145
2024-11-14 2024-09-30 13F MARKETAXESS HLDGS COM 57060D108 1,579,903 -63,709 -3.88 404,771 22.81 0.0165
2024-08-14 2024-06-30 13F MARKETAXESS HLDGS COM 57060D108 1,643,612 -83,421 -4.83 329,594 -12.96 0.0144
2024-05-15 2024-03-31 13F MARKETAXESS HLDGS COM 57060D108 1,727,033 27,908 1.64 378,652 -23.90 0.0169
2024-02-14 2023-12-31 13F MARKETAXESS HLDGS COM 57060D108 1,699,125 41,900 2.53 497,589 40.54 0.0242
2023-11-14 2023-09-30 13F MARKETAXESS HLDGS COM 57060D108 1,657,225 -18,874 -1.13 354,050 -19.20 0.0196
2023-08-14 2023-06-30 13F MARKETAXESS HLDGS COM 57060D108 1,676,099 36,977 2.26 438,166 -31.68 0.0230
2023-05-15 2023-03-31 13F MARKETAXESS HLDGS COM 57060D108 1,639,122 -95,983 -5.53 641,371 32.54 0.0362
2023-05-15 2022-12-31 13F/A-99 MARKETAXESS HLDGS COM 57060D108 1,735,105 -2,204 -0.13 483,903 25.19 0.0284
2023-05-15 2022-12-31 13F MARKETAXESS HLDGS COM 57060D108 1,735,105 -2,204 483,903 0.0284
2022-11-15 2022-09-30 13F MARKETAXESS HLDGS COM 57060D108 1,737,309 -36,435 -2.05 386,534 -14.88 0.0244
2022-08-15 2022-06-30 13F MARKETAXESS HLDGS COM 57060D108 1,773,744 -94,972 -5.08 454,096 -28.57 0.0272
2022-05-16 2022-03-31 13F MARKETAXESS HLDGS COM 57060D108 1,868,716 13,367 0.72 635,737 -16.68 0.0314
2022-02-14 2021-12-31 13F MARKETAXESS HLDGS COM 57060D108 1,855,349 37,878 2.08 763,049 -0.20 0.0362
2021-11-15 2021-09-30 13F MARKETAXESS HLDGS COM 57060D108 1,817,471 30,882 1.73 764,592 -7.69 0.0404
2021-08-16 2021-06-30 13F MARKETAXESS HLDGS COM 57060D108 1,786,589 22,147 1.26 828,245 -5.73 0.0437
2021-07-09 2021-03-31 13F/A-1 MARKETAXESS HLDGS COM 57060D108 1,764,442 64,714 3.81 878,551 -9.41 0.0504
2021-05-17 2021-03-31 13F MARKETAXESS HLDGS COM 57060D108 1,764,442 64,714 878,551 0.0504
2021-02-16 2020-12-31 13F MARKETAXESS HLDGS COM 57060D108 1,699,728 104 0.01 969,797 18.48 0.0594
2020-11-10 2020-09-30 13F MARKETAXESS HLDGS COM 57060D108 1,699,624 -30,717 -1.78 818,522 -5.57 0.0559
2020-08-14 2020-06-30 13F MARKETAXESS HLDGS COM 57060D108 1,730,341 9,614 0.56 866,762 51.46 0.0630
2020-06-19 2020-03-31 13F/A-1 MARKETAXESS HLDGS COM 57060D108 1,720,727 -6,829 -0.40 572,262 -12.62 0.0500
2020-05-11 2020-03-31 13F MARKETAXESS HLDGS COM 57060D108 1,720,727 -6,829 572,262 50,256.1262
2020-02-06 2019-12-31 13F MARKETAXESS HLDGS COM 57060D108 1,727,556 61,232 3.67 654,934 20.01 0.0449
2019-11-14 2019-09-30 13F MARKETAXESS HLDGS COM 57060D108 1,666,324 61,609 3.84 545,721 5.80 0.0407
2019-08-14 2019-06-30 13F MARKETAXESS HLDGS COM 57060D108 1,604,715 708,077 78.97 515,787 133.76 0.0385
2019-05-15 2019-03-31 13F MARKETAXESS HLDGS COM 57060D108 896,638 23,614 2.70 220,645 19.60 0.0172
2019-02-12 2018-12-31 13F MARKETAXESS HLDGS COM 57060D108 873,024 -84,647 -8.84 184,479 7.92 0.0168
2018-11-09 2018-09-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 957,671 10,456 1.10 170,939 -8.79 0.0131
2018-08-14 2018-06-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 947,215 -44,719 -4.51 187,417 -13.11 0.0157
2018-05-15 2018-03-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 991,934 -22,102 -2.18 215,687 5.43 0.0183
2018-02-14 2017-12-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 1,014,036 16,150 1.62 204,583 11.11 0.0165
2017-11-14 2017-09-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 997,886 12,908 1.31 184,124 -7.04 0.0159
2017-08-14 2017-06-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 984,978 4,168 0.42 198,075 7.72 0.0175
2017-05-15 2017-03-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 980,810 22,091 2.30 183,883 30.54 0.0164
2017-02-09 2016-12-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 958,719 -59,457 -5.84 140,859 -16.46 0.0133
2017-01-13 2016-09-30 13F/A-1 MARKETAXESS HOLDINGS Common equity shares 57060D108 1,018,176 -152 -0.01 168,603 13.87 0.0170
2016-11-14 2016-09-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 1,018,176 168,603
2016-08-12 2016-06-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 1,018,328 -213,783 -17.35 148,069 -3.73 0.0159
2016-05-20 2016-03-31 13F/A-1 MARKETAXESS HOLDINGS Common equity shares 57060D108 1,232,111 33,815 2.82 153,799 15.02 0.0166
2016-05-12 2016-03-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 1,232,111 153,799
2016-02-16 2015-12-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 1,198,296 434,160 56.82 133,714 88.40 0.0146
2015-11-16 2015-09-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 764,136 -24,160 -3.06 70,974 -2.95 0.0083
2015-08-13 2015-06-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 788,296 -37,851 -4.58 73,132 6.78 0.0078
2015-05-15 2015-03-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 826,147 6,273 0.77 68,487 16.49 0.0070
2015-02-11 2014-12-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 819,874 13,874 1.72 58,793 17.93 0.0059
2014-11-12 2014-09-30 13F/A-1 MARKETAXESS HOLDINGS Common equity shares 57060D108 806,000 74,322 10.16 49,855 26.04 0.0054
2014-11-12 2014-09-30 13F/A-1 MEASUREMENT SPECIALTIES Common equity shares 583421102 294,489 -1,811 25,210 0.0027
2014-11-10 2014-09-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 806,000 49,855
2014-11-10 2014-09-30 13F MEASUREMENT SPECIALTIES Common equity shares 583421102 294,489 25,210
2014-08-12 2014-06-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 731,678 -1,910 -0.26 39,555 -8.94 0.0043
2014-08-12 2014-06-30 13F MEASUREMENT SPECIALTIES Common equity shares 583421102 296,300 -1,949 25,503 0.0028
2014-05-15 2014-03-31 13F/A-1 MARKETAXESS HOLDINGS Common equity shares 57060D108 733,588 8,182 1.13 43,437 -10.45 0.0049
2014-05-15 2014-03-31 13F/A-1 MEASUREMENT SPECIALTIES Common equity shares 583421102 298,249 365 20,235 0.0023
2014-05-13 2014-03-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 733,688 43,443
2014-05-13 2014-03-31 13F MEASUREMENT SPECIALTIES Common equity shares 583421102 298,349 20,242
2014-02-06 2013-12-31 13F/A-1 MARKETAXESS HOLDINGS Common equity shares 57060D108 725,406 4,038 0.56 48,507 12.00 0.0054
2014-02-06 2013-12-31 13F/A-1 MEASUREMENT SPECIALTIES Common equity shares 583421102 297,884 13 18,076 0.0020
2014-02-06 2013-12-31 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 687,002 24,253
2014-02-06 2013-12-31 13F MEASUREMENT SPECIALTIES Common equity shares 583421102 292,668 -394,334 10,054 1,498.2772
2013-11-12 2013-09-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 721,368 13,177 1.86 43,308 30.80 0.0053
2013-11-12 2013-09-30 13F MEASUREMENT SPECIALTIES Common equity shares 583421102 297,871 8,000 16,154 0.0020
2013-08-08 2013-06-30 13F MARKETAXESS HOLDINGS Common equity shares 57060D108 708,191 708,191 33,110 0.0043
2013-08-08 2013-06-30 13F MEASUREMENT SPECIALTIES Common equity shares 583421102 289,871 -418,320 13,492 0.0018
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.