MarketAxess Holdings Inc.
US ˙ NasdaqGS ˙ US57060D1081

SecurityMKTX / MarketAxess Holdings Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership581,484 shares
Latest Disclosed Value $ 95,932,833
Dimensional Fund Advisors Lp reports 10.34% increase in ownership of MKTX / MarketAxess Holdings Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 581,484 shares of MarketAxess Holdings Inc. (US:MKTX) valued at $95,933,230 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 526,981 shares of MarketAxess Holdings Inc.. This represents a change in shares of 10.34% during the quarter. The current value of the position is $71,510,902 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)
2026-05-07 2026-03-31 13F MARKETAXESS HLDGS COM 57060D108 581,484 54,503 10.34 95,933 0.43 0.0043
2026-02-12 2025-12-31 13F MARKETAXESS HLDGS COM 57060D108 526,981 5,852 1.12 95,518 5.18 0.0200
2025-11-12 2025-09-30 13F MARKETAXESS HLDGS COM 57060D108 521,129 9,707 1.90 90,815 -20.49 0.0195
2025-08-12 2025-06-30 13F MARKETAXESS HLDGS COM 57060D108 511,422 40,662 8.64 114,212 12.14 0.0264
2025-05-13 2025-03-31 13F MARKETAXESS HLDGS COM 57060D108 470,760 72,893 18.32 101,848 13.25 0.0253
2025-02-13 2024-12-31 13F MARKETAXESS HLDGS COM 57060D108 397,867 25,763 6.92 89,934 -5.66 0.0216
2024-11-07 2024-09-30 13F MARKETAXESS HLDGS COM 57060D108 372,104 49,040 15.18 95,330 47.15 0.0231
2024-08-09 2024-06-30 13F MARKETAXESS HLDGS COM 57060D108 323,064 107,315 49.74 64,784 36.96 0.0169
2024-05-10 2024-03-31 13F MARKETAXESS HLDGS COM 57060D108 215,749 13,515 6.68 47,303 -20.14 0.0128
2024-02-07 2023-12-31 13F MARKETAXESS HLDGS COM 57060D108 202,234 5,475 2.78 59,229 40.91 0.0173
2023-11-09 2023-09-30 13F MARKETAXESS HLDGS COM 57060D108 196,759 3,709 1.92 42,032 -16.72 0.0138
2023-08-09 2023-06-30 13F MARKETAXESS HLDGS COM 57060D108 193,050 5,194 2.76 50,469 -31.34 0.0161
2023-05-12 2023-03-31 13F MARKETAXESS HLDGS COM 57060D108 187,856 66 0.04 73,504 141,251.92 0.0248
2023-02-09 2022-12-31 13F MARKETAXESS HLDGS COM 57060D108 187,790 6,156 3.39 52 -99.87 0.0155
2022-11-10 2022-09-30 13F MARKETAXESS HLDGS COM 57060D108 181,634 2,609 1.46 40,415 -11.82 0.0155
2022-08-12 2022-06-30 13F MARKETAXESS HLDGS COM 57060D108 179,025 11,333 6.76 45,834 -19.67 0.0164
2022-05-13 2022-03-31 13F MARKETAXESS HLDGS COM 57060D108 167,692 -4,346 -2.53 57,056 -19.36 0.0176
2022-02-09 2021-12-31 13F MARKETAXESS HLDGS COM 57060D108 172,038 -7,558 -4.21 70,755 -6.36 0.0214
2021-11-12 2021-09-30 13F MARKETAXESS HLDGS COM 57060D108 179,596 -857 -0.47 75,559 -9.69 0.0243
2021-08-12 2021-06-30 13F MARKETAXESS HLDGS COM 57060D108 180,453 526 0.29 83,665 -6.61 0.0265
2021-05-14 2021-03-31 13F MARKETAXESS HLDGS COM 57060D108 179,927 -1,082 -0.60 89,587 -13.25 0.0296
2021-03-08 2020-12-31 13F/A-2 MARKETAXESS HLDGS COM 57060D108 181,009 -4,306 -2.32 103,268 15.71 0.0373
2021-02-11 2020-12-31 13F MARKETAXESS HLDGS COM 57060D108 181,009 -4,306 103,268 37,294.9126
2020-11-12 2020-09-30 13F MARKETAXESS HLDGS COM 57060D108 185,315 2,273 1.24 89,250 -2.66 0.0378
2020-08-13 2020-06-30 13F MARKETAXESS HLDGS COM 57060D108 183,042 -4,730 -2.52 91,686 46.77 0.0403
2020-05-14 2020-03-31 13F MARKETAXESS HLDGS COM 57060D108 187,772 -10,434 -5.26 62,470 -16.86 0.0325
2020-02-14 2019-12-31 13F MARKETAXESS HLDGS COM 57060D108 198,206 -4,472 -2.21 75,137 13.20 0.0274
2019-11-12 2019-09-30 13F MARKETAXESS HLDGS COM 57060D108 202,678 5,612 2.85 66,374 4.80 0.0258
2019-08-13 2019-06-30 13F MARKETAXESS HLDGS COM 57060D108 197,066 -103 -0.05 63,335 30.53 0.0246
2019-08-12 2019-03-31 13F/A-2 MARKETAXESS HLDGS COM 57060D108 197,169 -1,843 -0.93 48,520 15.39 0.0193
2019-05-10 2019-03-31 13F MARKETAXESS HLDGS COM 57060D108 197,169 -1,843 48,520
2019-02-26 2018-12-31 13F/A-1 MARKETAXESS HLDGS COM 57060D108 199,012 12,096 6.47 42,050 26.04 0.0190
2019-02-13 2018-12-31 13F MARKETAXESS HLDGS COM 57060D108 199,012 12,096 42,050
2018-11-13 2018-09-30 13F MARKETAXESS HLDGS COM 57060D108 186,916 15,493 9.04 33,362 -1.65 0.0127
2018-08-10 2018-06-30 13F MARKETAXESS HLDGS COM 57060D108 171,423 1,696 1.00 33,923 -8.08 0.0135
2018-05-11 2018-03-31 13F MARKETAXESS HLDGS COM 57060D108 169,727 499 0.29 36,905 8.09 0.0154
2018-02-12 2017-12-31 13F MARKETAXESS HLDGS COM 57060D108 169,228 -10,905 -6.05 34,143 2.73 0.0142
2017-11-13 2017-09-30 13F MARKETAXESS HLDGS COM 57060D108 180,133 -12,369 -6.43 33,235 -14.15 0.0145
2017-08-11 2017-06-30 13F MARKETAXESS HLDGS COM 57060D108 192,502 -21,256 -9.94 38,715 -3.40 0.0179
2017-05-12 2017-03-31 13F MARKETAXESS HLDGS COM 57060D108 213,758 -179,087 -45.59 40,076 -30.56 0.0192
2017-02-09 2016-12-31 13F MARKETAXESS HLDGS COM 57060D108 392,845 -236,072 -37.54 57,716 -44.58 0.0288
2016-11-10 2016-09-30 13F MARKETAXESS HLDGS COM 57060D108 628,917 -10,679 -1.67 104,143 11.99 0.0563
2016-08-09 2016-06-30 13F MARKETAXESS HLDGS COM 57060D108 639,596 2,875 0.45 92,995 17.00 0.0535
2016-05-13 2016-03-31 13F MARKETAXESS HLDGS COM 57060D108 636,721 -12,689 -1.95 79,481 9.68 0.0476
2016-02-10 2015-12-31 13F MARKETAXESS HLDGS COM 57060D108 649,410 2,529 0.39 72,469 20.62 0.0452
2015-11-13 2015-09-30 13F MARKETAXESS HLDGS COM 57060D108 646,881 804 0.12 60,081 0.24 0.0394
2015-08-14 2015-06-30 13F MARKETAXESS HLDGS COM 57060D108 646,077 6,812 1.07 59,937 13.10 0.0367
2015-05-14 2015-03-31 13F MARKETAXESS HLDGS COM 57060D108 639,265 14,424 2.31 52,997 18.28 0.0335
2015-02-06 2014-12-31 13F MARKETAXESS HLDGS COM 57060D108 624,841 91,847 17.23 44,808 -1.80 0.0294
2014-11-13 2014-09-30 13F MEASUREMENT SPECIALTIES COM 583421102 532,994 -1,890 -0.35 45,630 -0.88 0.0323
2014-11-13 2014-09-30 13F MARKETAXESS HLDGS COM 57060D108 580,908 13,796 35,935 0.0255
2014-08-08 2014-06-30 13F MEASUREMENT SPECIALTIES COM 583421102 534,884 22,200 4.33 46,037 32.35 0.0320
2014-08-08 2014-06-30 13F MARKETAXESS HLDGS COM 57060D108 567,112 12,610 30,659 0.0213
2014-05-14 2014-03-31 13F MEASUREMENT SPECIALTIES COM 583421102 512,684 6,429 1.27 34,785 13.22 0.0260
2014-05-14 2014-03-31 13F MARKETAXESS HLDGS COM 57060D108 554,502 911 32,837 0.0245
2014-02-12 2013-12-31 13F MEASUREMENT SPECIALTIES COM 583421102 506,255 -77 -0.02 30,724 11.87 0.0239
2014-02-12 2013-12-31 13F MARKETAXESS HLDGS COM 57060D108 553,591 24,774 37,018 0.0288
2013-11-13 2013-09-30 13F MEASUREMENT SPECIALTIES COM 583421102 506,332 4,464 0.89 27,463 17.60 0.0238
2013-11-13 2013-09-30 13F MARKETAXESS HLDGS COM 57060D108 528,817 5,586 31,750 0.0275
2013-08-15 2013-06-30 13F MEASUREMENT SPECIALTIES COM 583421102 501,868 501,868 23,352 0.0220
2013-08-15 2013-06-30 13F MARKETAXESS HLDGS COM 57060D108 523,231 21,363 24,461 0.0230
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.