| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Portney Emily Hope | Director | C/O MARKETAXESS HOLDINGS INC., 55 HUDSON YARDS, 15TH FLOOR, NEW YORK | /s/ Patrick Wilson as Attorney-in-Fact for Emily H. Portney | 15 Aug 2025 | 0001720194 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MKTX | Common Stock, par value $0.003 per share | Gift | $0 | -3.66K | -82.34% | $0.00 | 784 | 13 Aug 2025 | Direct | |
| transaction | MKTX | Common Stock, par value $0.003 per share | Gift | $0 | +3.66K | $0.00 | 3.66K | 13 Aug 2025 | By GRAT |