Marketaxess Holdings Inc has 17 Schedule 13D or 13G filings on record since 2025-08-06. 6 holders' latest filing reports 5% or more of common stock, $0.003 par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| BlackRock, Inc. | 10.9% | 4,034,537 | SCHEDULE 13G/A, 2026-02-06 | 2026-01-31 |
| Primecap Management Co | 9.86% | 3,504,905 | SCHEDULE 13G/A, 2026-08-06 | 2026-06-30 |
| North Reef Capital Management LP | 9.55% | 3,395,000 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Vanguard Portfolio Management | 6.09% | 2,168,085 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| AQR Capital Management, LLC | 5.59% | 1,987,288 | SCHEDULE 13G/A, 2026-08-13 | 2026-06-30 |
| Vanguard Capital Management | 5.32% | 1,892,096 | SCHEDULE 13G, 2026-04-30 | 2026-03-31 |
| Fmr LLC | 4.2% | 1,500,929 | SCHEDULE 13G/A, 2026-05-06 | 2026-03-31 |
| T. Rowe Price Investment Management, Inc. | 3.7% | 1,370,694 | SCHEDULE 13G/A, 2025-11-14 | 2025-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-06 | Fmr LLC | 6.1% | SCHEDULE 13G/A |
| 2025-10-17 | BlackRock, Inc. | 4.2% | SCHEDULE 13G/A |
| 2025-10-31 | The Vanguard Group | 10.31% | SCHEDULE 13G/A |
| 2025-11-13 | Primecap Management Co | 5.97% | SCHEDULE 13G |
| 2025-11-14 | T. Rowe Price Investment Management, Inc. | 3.7% | SCHEDULE 13G/A |
| 2026-01-21 | BlackRock, Inc. | 9.9% | SCHEDULE 13G |
| 2026-02-06 | BlackRock, Inc. | 10.9% | SCHEDULE 13G/A |
| 2026-02-11 | Primecap Management Co | 8.54% | SCHEDULE 13G/A |
| 2026-02-13 | AQR Capital Management, LLC | 6.88% | SCHEDULE 13G |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 6.09% | SCHEDULE 13G |
| 2026-04-30 | Vanguard Capital Management | 5.32% | SCHEDULE 13G |
| 2026-05-06 | Fmr LLC | 4.2% | SCHEDULE 13G/A |
| 2026-05-15 | North Reef Capital Management LP | 5.27% | SCHEDULE 13G |
| 2026-08-06 | Primecap Management Co | 9.86% | SCHEDULE 13G/A |
| 2026-08-13 | AQR Capital Management, LLC | 5.59% | SCHEDULE 13G/A |
| 2026-08-14 | North Reef Capital Management LP | 9.55% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.