| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| HERNANDEZ CARLOS MAURICIO | Director | C/O MARKETAXESS HOLDINGS INC., 55 HUDSON YARDS, 15TH FLOOR, NEW YORK | /s/ Patrick Wilson as Attorney-in-Fact for Carlos M. Hernandez | 26 Nov 2025 | 0001350131 |
| 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 | -7,466 | -100% | $0.000000 | 0 | 25 Nov 2025 | By GRAT 1 | |
| transaction | MKTX | Common Stock, par value $0.003 per share | Gift | $0 | +7,466 | +247% | $0.000000 | 10,490 | 25 Nov 2025 | Direct | |
| holding | MKTX | Common Stock, par value $0.003 per share | 12,480 | 25 Nov 2025 | By GRAT 2 |