Michael R. Cianciulli - 01 Apr 2025 Form 4 Insider Report for MARKETAXESS HOLDINGS INC (MKTX)

Role: Head of Ext Rep & Comp Accting
Signature: /s/ Conor Colasurdo, as Attorney-in-Fact for Michael R. Cianciulli
Issuer symbol: MKTX
Transactions as of: 01 Apr 2025
Net transactions value: $0
Form type: 4
Filing time: 03 Jun 2025, 16:10:16 UTC
Previous filing: 18 Feb 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Cianciulli Michael R.	Head of Ext Rep & Comp Accting	C/O MARKETAXESS HOLDINGS INC., 55 HUDSON YARDS, 15TH FLOOR, NEW YORK	/s/ Conor Colasurdo, as Attorney-in-Fact for Michael R. Cianciulli	03 Jun 2025	0002007722

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MKTX	Common Stock, par value $0.003 per share	Award	$0	+232	+25%	$0.000000	1,155	01 Apr 2025	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents a grant of restricted stock units pursuant to the Company's 2020 Equity Incentive Plan. The restricted stock units shall vest in four equal installments on April 1, 2026, April 1, 2027, April 1, 2028 and April 1, 2029.