[Form 3] MARKETAXESS HOLDINGS INC Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Dean Berry filed an initial Form 3 disclosing his relationship to MarketAxess Holdings Inc. (MKTX) as an officer: Group COO & CEO, EMEA & APAC. The report, dated 09/29/2025, shows 0 shares of common stock beneficially owned and no derivative securities disclosed. The form was signed by an attorney-in-fact, Patrick Wilson.

Insights

Securities Analyst

TL;DR: Routine initial Section 16 filing discloses officer role but no beneficial ownership of common stock or derivatives.

This Form 3 notifies the market that Dean Berry holds an executive officer position with MKTX and that, as of the filing date, he does not beneficially own common stock or derivative securities subject to Section 16 reporting. For investors, the filing is informational and does not indicate an equity stake that would align Berry's interests with shareholders.

Corporate Governance Expert

TL;DR: Governance disclosure completed; absence of reported holdings may reflect timing or separate disclosure obligations.

The filing satisfies Section 16 initial-reporting requirements by identifying the reporting person, relationship to the issuer, and ownership status. The reported zero holdings are noteworthy from a governance transparency perspective but do not imply any regulatory deficiency. Signature by an attorney-in-fact is standard practice for authorized filings.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Berry Dean

(Last) (First) (Middle)

C/O MARKETAXESS HOLDINGS INC.

55 HUDSON YARDS, 15TH FLOOR

(Street)

NEW YORK NY 10001

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
09/29/2025

3. Issuer Name and Ticker or Trading Symbol
MARKETAXESS HOLDINGS INC [ MKTX ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Group COO & CEO, EMEA & APAC

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, par value $0.003 per share	0	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24-Power of Attorney

	/s/ Patrick Wilson, as Attorney-in-Fact for Dean Berry	09/29/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

Who filed the Form 3 for MKTX?

The Form 3 was filed for Dean Berry, identified as Group COO & CEO, EMEA & APAC.

What date is listed on the MKTX Form 3?

The event date on the Form 3 is 09/29/2025.

How many MKTX common shares does the reporting person own?

The Form 3 reports 0 shares of MKTX common stock beneficially owned.

Are any derivative securities reported on the MKTX Form 3?

No derivative securities (options, warrants, convertible securities) are reported in Table II.

Who signed the MKTX Form 3?

The form is signed by Patrick Wilson as Attorney-in-Fact for Dean Berry on 09/29/2025.