MarketAxess Holdings Inc.
MX ˙ BMV ˙ US57060D1081
SecurityMX:MKTX / MarketAxess Holdings Inc.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership125 shares
Latest Disclosed Value $ 20,623
Quadrant Capital Group Llc reports 5.30% decrease in ownership of MKTX / MarketAxess Holdings Inc.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 125 shares of MarketAxess Holdings Inc. (MX:MKTX) valued at $20,623 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 132 shares of MarketAxess Holdings Inc.. This represents a change in shares of -5.30% during the quarter.

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)
2026-05-13 2026-03-31 13F/A-1 MARKETAXESS HLDGS COM 57060D108 125 -7 -5.30 21 -13.04 0.0006
2026-05-11 2026-03-31 13F MARKETAXESS HLDGS COM 57060D108 125 -7 49 0.0369
2026-02-12 2025-12-31 13F MARKETAXESS HLDGS COM 57060D108 132 -860 -86.69 24 -86.63 0.0007
2025-11-13 2025-09-30 13F MARKETAXESS HLDGS COM 57060D108 992 -661 -39.99 173 -53.39 0.0056
2025-08-13 2025-06-30 13F MARKETAXESS HLDGS COM 57060D108 1,653 -36 -2.13 369 1.10 0.0133
2025-05-13 2025-03-31 13F MARKETAXESS HLDGS COM 57060D108 1,689 1,550 1,115.11 365 1,077.42 0.0136
2025-02-13 2024-12-31 13F MARKETAXESS HLDGS COM 57060D108 139 0 0.00 31 -11.43 0.0022
2024-11-12 2024-09-30 13F MARKETAXESS HLDGS COM 57060D108 139 -19 -12.03 36 12.90 0.0025
2024-08-12 2024-06-30 13F MARKETAXESS HLDGS COM 57060D108 158 -87 -35.51 32 -41.51 0.0024
2024-05-15 2024-03-31 13F MARKETAXESS HLDGS COM 57060D108 245 -30 -10.91 54 -33.75 0.0042
2024-02-08 2023-12-31 13F MARKETAXESS HLDGS COM 57060D108 275 17 6.59 81 45.45 0.0069
2023-11-14 2023-09-30 13F MARKETAXESS HLDGS COM 57060D108 258 -59 -18.61 55 -32.93 0.0055
2023-08-10 2023-06-30 13F MARKETAXESS HLDGS COM 57060D108 317 -130 -29.08 83 -52.87 0.0082
2023-05-11 2023-03-31 13F MARKETAXESS HLDGS COM 57060D108 447 52 13.16 175 58.18 0.0182
2023-02-13 2022-12-31 13F MARKETAXESS HLDGS COM 57060D108 395 -14 -3.42 110 20.88 0.0125
2022-11-10 2022-09-30 13F MARKETAXESS HLDGS COM 57060D108 409 -70 -14.61 91 -26.02 0.0120
2022-08-09 2022-06-30 13F MARKETAXESS HLDGS COM 57060D108 479 182 61.28 123 21.78 0.0165
2022-05-06 2022-03-31 13F MARKETAXESS HLDGS COM 57060D108 297 23 8.39 101 -10.62 0.0122
2022-02-01 2021-12-31 13F MARKETAXESS HLDGS COM 57060D108 274 49 21.78 113 18.95 0.0135
2021-11-12 2021-09-30 13F MARKETAXESS HLDGS COM 57060D108 225 -34 -13.13 95 -20.83 0.0133
2021-08-09 2021-06-30 13F MARKETAXESS HLDGS COM 57060D108 259 -35 -11.90 120 -17.81 0.0174
2021-05-12 2021-03-31 13F MARKETAXESS HLDGS COM 57060D108 294 26 9.70 146 -4.58 0.0237
2021-02-16 2020-12-31 13F MARKETAXESS HLDGS COM 57060D108 268 38 16.52 153 37.84 0.0284
2020-11-13 2020-09-30 13F MARKETAXESS HLDGS COM 57060D108 230 -52 -18.44 111 -21.28 0.0242
2020-08-13 2020-06-30 13F MARKETAXESS HLDGS COM 57060D108 282 -133 -32.05 141 1.44 0.0312
2020-05-15 2020-03-31 13F MarketAxess Holdings Com 57060D108 415 6 1.47 139 -7.95 0.0233
2020-03-19 2019-12-31 13F/A-1 MarketAxess Holdings Com 57060D108 409 0 0.00 151 17.97 0.0182
2020-02-03 2019-12-31 13F MarketAxess Holdings Com 57060D108 409 0 151 510.2487
2019-10-24 2019-09-30 13F MarketAxess Holdings COM 57060D108 409 0 0.00 128 0.79 0.0197
2019-07-24 2019-06-30 13F MarketAxess Holdings COM 57060D108 409 0 0.00 127 30.93 0.0201
2019-04-29 2019-03-31 13F MarketAxess Holdings COM 57060D108 409 172 72.57 97 102.08 0.0170
2019-01-17 2018-12-31 13F MarketAxess Holdings COM 57060D108 237 -1 -0.42 48 20.00 0.0128
2018-10-29 2018-09-30 13F MarketAxess Holdings COM 57060D108 238 -10 -4.03 40 -11.11 0.0114
2018-08-08 2018-06-30 13F MarketAxess Holdings COM 57060D108 248 10 4.20 45 -8.16 0.0158
2018-05-10 2018-03-31 13F MarketAxess Holdings COM 57060D108 238 0 0.00 49 6.52 0.0178
2018-01-31 2017-12-31 13F Marketaxess Holdings COM 57060D108 238 -70 -22.73 46 -11.54 0.0183
2017-10-13 2017-09-30 13F Marketaxess Holdings COM 57060D108 308 0 0.00 52 -10.34 0.0215
2017-08-14 2017-06-30 13F Marketaxess Holdings COM 57060D108 308 0 0.00 58 7.41 0.0256
2017-04-10 2017-03-31 13F Marketaxess Holdings COM 57060D108 308 15 5.12 54 31.71 0.0237
2017-01-11 2016-12-31 13F Marketaxess Holdings COM 57060D108 293 0 0.00 41 -10.87 0.0206
2016-10-25 2016-09-30 13F Marketaxess Holdings COM 57060D108 293 -16 -5.18 46 6.98 0.0300
2016-07-28 2016-06-30 13F Marketaxess Holdings COM 57060D108 309 3 0.98 43 19.44 0.0296
2016-04-27 2016-03-31 13F Marketaxess Holdings COM 57060D108 306 81 36.00 36 50.00 0.0233
2016-01-28 2015-12-31 13F Marketaxess Holdings COM 57060D108 225 -7 -3.02 24 26.32 0.0166
2015-10-28 2015-09-30 13F Marketaxess Holdings COM 57060D108 232 0 0.00 19 0.00 0.0131
2015-08-12 2015-06-30 13F Marketaxess Holdings COM 57060D108 232 232 19 0.0121
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.