MarketAxess Holdings Inc.
US ˙ NasdaqGS ˙ US57060D1081

SecurityMKTX / MarketAxess Holdings Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership5,330 shares
Latest Disclosed Value $ 879,715
Advisor Group Holdings, Inc. reports 54.85% increase in ownership of MKTX / MarketAxess Holdings Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 5,330 shares of MarketAxess Holdings Inc. (US:MKTX) valued at $879,343 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,442 shares of MarketAxess Holdings Inc.. This represents a change in shares of 54.85% during the quarter. The current value of the position is $623,237 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 5,330 1,888 54.85 880 40.87 0.0007
2026-02-17 2025-12-31 13F MARKETAXESS HLDGS COM 57060D108 3,442 -2,382 -40.90 624 -39.00 0.0009
2025-11-14 2025-09-30 13F MARKETAXESS HLDGS COM 57060D108 5,824 517 9.74 1,023 -13.52 0.0014
2025-09-04 2025-06-30 13F/A-1 ARKETAXESS HLDGS COM 57060D108 5,307 170 3.31 1,184 6.38 0.0021
2025-08-13 2025-06-30 13F ARKETAXESS HLDGS COM 57060D108 5,195 58 1,161 0.0013
2025-05-12 2025-03-31 13F MARKETAXESS HLDGS COM 57060D108 5,137 -396 -7.16 1,112 -11.11 0.0025
2025-06-06 2024-12-31 13F/A-1 MARKETAXESS HLDGS COM 57060D108 5,533 245 4.63 1,251 -7.68 0.0028
2025-02-07 2024-12-31 13F MARKETAXESS HLDGS COM 57060D108 5,597 309 1,295 0.0033
2024-11-13 2024-09-30 13F MARKETAXESS HLDGS COM 57060D108 5,288 -1,573 -22.93 1,355 -1.60 0.0031
2024-08-13 2024-06-30 13F MARKETAXESS HLDGS COM 57060D108 6,861 2,993 77.38 1,378 62.38 0.0033
2024-05-10 2024-03-31 13F MARKETAXESS HLDGS COM 57060D108 3,868 -2,631 -40.48 849 -55.46 0.0019
2024-02-12 2023-12-31 13F MARKETAXESS HLDGS COM 57060D108 6,499 -1,786 -21.56 1,904 7.57 0.0033
2023-11-13 2023-09-30 13F MARKETAXESS HLDGS COM 57060D108 8,285 91 1.11 1,771 -17.33 0.0026
2023-08-21 2023-06-30 13F/A-1 MARKETAXESS HLDGS COM 57060D108 8,194 -3,982 -32.70 2,141 -55.01 0.0038
2023-08-10 2023-06-30 13F MARKETAXESS HLDGS COM 57060D108 8,715 -3,461 2,141 0.0006
2023-05-12 2023-03-31 13F MARKETAXESS HLDGS COM 57060D108 12,176 1,651 15.69 4,760 62.04 0.0090
2023-02-10 2022-12-31 13F MARKETAXESS HLDGS COM 57060D108 10,525 -1,953 -15.65 2,937 5.72 0.0059
2022-11-14 2022-09-30 13F MARKETAXESS HLDGS COM 57060D108 12,478 3,793 43.67 2,778 24.80 0.0063
2022-08-10 2022-06-30 13F MARKETAXESS HLDGS COM 57060D108 8,685 -675 -7.21 2,226 -34.86 0.0049
2022-05-04 2022-03-31 13F MARKETAXESS HLDGS COM 57060D108 9,360 1,244 15.33 3,417 2.37 0.0066
2022-02-03 2021-12-31 13F MARKETAXESS HLDGS COM 57060D108 8,116 -3,876 -32.32 3,338 -33.84 0.0063
2021-11-05 2021-09-30 13F MARKETAXESS HLDGS COM 57060D108 11,992 1,476 14.04 5,045 3.44 0.0105
2021-08-02 2021-06-30 13F MARKETAXESS HLDGS COM 57060D108 10,516 79 0.76 4,877 -6.19 0.0106
2021-05-13 2021-03-31 13F MARKETAXESS HLDGS COM 57060D108 10,437 -2,219 -17.53 5,199 -28.01 0.0125
2021-02-10 2020-12-31 13F MARKETAXESS HLDGS COM 57060D108 12,656 -807 -5.99 7,222 11.33 0.0193
2020-11-12 2020-09-30 13F MARKETAXESS HLDGS COM 57060D108 13,463 -6,474 -32.47 6,487 -35.05 0.0194
2020-08-14 2020-06-30 13F MARKETAXESS HLDGS COM 57060D108 19,937 12,936 184.77 9,988 328.12 0.0335
2020-05-18 2020-03-31 13F MARKETAXESS HLDGS COM 57060D108 7,001 7,001 2,333 0.0096
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.