As of November 7, 2026, Marketaxess Holdings Inc. is a publicly traded company (Nasdaq: MKTX); its largest reported holder is BlackRock, with 10.9% on Schedule 13G/A of February 6, 2026, then North Reef Capital Management LP (9.55%). The largest insider holding is Richard M. McVey, the chairman and a director, with 564,029 shares (1.6% of shares outstanding), per Form 4 of November 14, 2024 (Schedule 13G/A, February 6, 2026).
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Is Marketaxess Holdings Inc. a real, registered company?
- Marketaxess Holdings Inc files with the SEC under CIK 1278021 (its SEC filings).
- Its shares are listed under the ticker MKTX on Nasdaq (SEC company record).
- business address in New York, New York, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under MARKETAXESS HOLDINGS INC in our court records and SEC 8-K records (as of 2026-11-07).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Primecap Management Co. (filed 2026-11-05).
Who are Marketaxess Holdings Inc.'s owners and officers?
Marketaxess Holdings Inc.: business address in New York, New York; industry Security Brokers, Dealers & Flotation Companies (Schedule 13G/A, 2026-11-05).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-11-05 | Primecap Management Co/Ca/ | 7% |
| Schedule 13G/A, 2026-08-14 | North Reef Capital Management LP | 9.55% |
| Schedule 13G/A, 2026-08-13 | Aqr Capital Management, LLC | 5.59% |
| Schedule 13G/A, 2026-08-06 | Primecap Management Co/Ca/ | 9.86% |
| Schedule 13G, 2026-05-15 | North Reef Capital Management LP | 5.27% |
| Schedule 13G/A, 2026-05-06 | Fmr LLC | 4.2% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.32% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 6.09% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G, 2026-02-13 | Aqr Capital Management, LLC | 6.88% |
| Schedule 13G/A, 2026-02-11 | Primecap Management Co/Ca/ | 8.54% |
| Schedule 13G/A, 2026-02-06 | Blackrock, Inc. | 10.9% |
Questions about who owns Marketaxess Holdings Inc.
Who owns Marketaxess Holdings Inc.?
On this page, 6 holders' latest ownership filings report 5% or more of Marketaxess Holdings Inc.: Blackrock, Inc. (10.9%, Schedule 13G/A, filed 2026-02-06), North Reef Capital Management LP (9.55%, Schedule 13G/A, filed 2026-08-14), Primecap Management Co/Ca/ (7%, Schedule 13G/A, filed 2026-11-05), Vanguard Portfolio Management (6.09%, Schedule 13G, filed 2026-04-29) and Aqr Capital Management, LLC (5.59%, Schedule 13G/A, filed 2026-08-13); 1 more is listed above.
Who are the largest shareholders of Marketaxess Holdings Inc.?
By the share each holder's latest filing reports, the largest holders of Marketaxess Holdings Inc. on this page are Blackrock, Inc. (10.9%), North Reef Capital Management LP (9.55%) and Primecap Management Co/Ca/ (7%).
When did Blackrock, Inc. buy into Marketaxess Holdings Inc.?
The filings give report dates, not purchase dates. The earliest filing from Blackrock, Inc. on this page is the Schedule 13G/A, filed 2026-02-06, reporting 10.9%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on Marketaxess Holdings Inc covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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Which insiders own Marketaxess Holdings Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chairman and a director: 564,029 shares (1.6% of shares outstanding), 562,029 held directly and 2,000 indirectly (Form 4, 2024-11-14).
- , the chief revenue officer: 71,049 shares (0.20% of shares outstanding) (Form 4, 2026-02-17).
- , the chief executive and a director: 53,600 shares (0.15% of shares outstanding) (Form 4, 2026-04-06).
- , a director: 53,193 shares (0.15% of shares outstanding), 9,985 held directly and 43,208 indirectly (Form 4, 2025-09-09).
- , the chief executive and chief operating officer: 26,017 shares (0.07% of shares outstanding) (Form 4, 2025-10-02).
Shares outstanding: 35,204,675 as of 2026-11-03, from the company's latest SEC cover page.
How much has Marketaxess Holdings Inc. raised?
No fundraising or offering filing from Marketaxess Holdings Inc. is on file with us.
Keep reading
More on Marketaxess Holdings Inc and the records around it.
Marketaxess Holdings Inc elsewhere on the record
- 5%+ stake filings Nov 2026
Companies that share a holder
- North Reef Capital Management LP also filed stake reports on 9 other companies: Alkami Technology, Inc. (Aug 2026), i3 Verticals, Inc. (Aug 2026), Seacoast Banking Corporation of Florida (Aug 2026)
- PRIMECAP MANAGEMENT CO/CA/ also filed stake reports on 24 other companies: Xencor Inc (Nov 2026), GRAIL, Inc. (Nov 2026), Pulmonx Corp (Nov 2026)
- T. Rowe Price Investment Management, Inc. also filed stake reports on 167 other companies: CABALETTA BIO INC (Nov 2026), MADISON SQUARE GARDEN SPORTS CORP (Nov 2026), MSG RANGERS CORP (Nov 2026)
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