MarketAxess CFO surrenders shares for taxes

MarketAxess Holdings Inc. Chief Financial Officer Ilene Fiszel Bieler surrendered 332 shares of common stock to the company to cover tax withholding on vested restricted stock units.

Rhea-AI Filing Summary

MarketAxess Holdings Inc. Chief Financial Officer Ilene Fiszel Bieler surrendered 332 shares of common stock to the company to cover tax withholding on vested restricted stock units. This routine tax-withholding disposition is not an open-market sale. Following the transaction, she directly holds 8,656 shares of MarketAxess common stock.

Insider Trade Summary

Exercise Price or Tax Liability: 332 shares

Exercise Price or Tax Liability 1 txn

Insider Fiszel Bieler Ilene

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock, par value $0.003 per share	332	$123.18	$41K

Holdings After Transaction: Common Stock, par value $0.003 per share — 8,656 shares (Direct)

Footnotes (1)

1. F1. Represents the surrender of shares to the Company to satisfy the Reporting Person's tax withholding obligation upon the vesting of restricted stock units previously granted to the Reporting Person.

Key Figures

Shares surrendered for taxes: 332 shares Price per share: $123.18 per share Shares held after transaction: 8,656 shares

3 metrics

Shares surrendered for taxes 332 shares Tax-withholding disposition on vested RSUs

Price per share $123.18 per share Valuation of surrendered shares

Shares held after transaction 8,656 shares Direct holdings of CFO following Form 4 event

Key Terms

restricted stock units, tax withholding obligation, Common Stock, par value $0.003 per share

3 terms

restricted stock units financial

"upon the vesting of restricted stock units previously granted to the Reporting Person"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligation financial

"to satisfy the Reporting Person's tax withholding obligation upon the vesting"

Common Stock, par value $0.003 per share financial

"Common Stock, par value $0.003 per share"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MarketAxess (MKTX) report for its CFO?

MarketAxess reported a routine tax-withholding transaction by its CFO. Ilene Fiszel Bieler surrendered 332 shares of common stock back to the company to satisfy tax obligations arising from the vesting of previously granted restricted stock units, rather than selling shares in the open market.

How many MarketAxess (MKTX) shares were used for the CFO’s tax withholding?

The CFO surrendered 332 MarketAxess common shares for tax withholding. These shares were delivered to the company to cover her tax obligation upon vesting of restricted stock units, as described in the Form 4 and related footnote.

At what price were the surrendered MarketAxess (MKTX) shares valued?

The surrendered MarketAxess shares were valued at $123.18 per share. This price was used for the 332-share tax-withholding disposition, according to the Form 4 data describing the non-derivative transaction by CFO Ilene Fiszel Bieler.

How many MarketAxess (MKTX) shares does the CFO hold after this Form 4 transaction?

After the transaction, the CFO directly holds 8,656 MarketAxess shares. The Form 4 shows this total share count following the 332-share surrender to the company for tax withholding related to vested restricted stock units.

Was the MarketAxess (MKTX) CFO’s Form 4 transaction an open-market sale?

No, the transaction was not an open-market sale. The Form 4 and footnote explain that the 332 shares were surrendered to MarketAxess solely to satisfy tax withholding on vested restricted stock units, a common compensation-related event.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/03/2026 - 04:15 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Fiszel Bieler Ilene

(Last) (First) (Middle)

C/O MARKETAXESS HOLDINGS INC.

55 HUDSON YARDS, 15TH FLOOR

(Street)

NEW YORK NEW YORK 10001

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/03/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.003 per share	06/03/2026		F(1)		332	D	$123.18	8,656	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the surrender of shares to the Company to satisfy the Reporting Person's tax withholding obligation upon the vesting of restricted stock units previously granted to the Reporting Person.

	/s/ Patrick Wilson as Attorney-in-Fact for Ilene Fiszel Bieler	06/03/2026
	** 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 4 (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.
* Form 4: SEC 1474 (03-26)