MarketAxess CEO covers taxes with 349 MKTX shares

MarketAxess Holdings Inc. Chief Executive Officer Christopher R. Concannon reported a small share disposition related to equity compensation.

Rhea-AI Filing Summary

MarketAxess Holdings Inc. Chief Executive Officer Christopher R. Concannon reported a small share disposition related to equity compensation. On the vesting of previously granted restricted stock units, he surrendered 349 shares of common stock to the company to satisfy his tax withholding obligation at $171.46 per share. Following this tax-withholding transaction, he continues to hold 53,600 shares of MarketAxess common stock directly, indicating the move was administrative rather than an open-market sale.

Insider Trade Summary

Exercise Price or Tax Liability: 349 shares

Exercise Price or Tax Liability 1 txn

Insider CONCANNON CHRISTOPHER R

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock, par value $0.003 per share	349	$171.46	$60K

Holdings After Transaction: Common Stock, par value $0.003 per share — 53,600 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: 349 shares Reported share value: $171.46 per share Shares held after transaction: 53,600 shares

3 metrics

Shares surrendered for taxes 349 shares Tax-withholding disposition on RSU vesting

Reported share value $171.46 per share Value used for the 349-share tax-withholding disposition

Shares held after transaction 53,600 shares Direct holdings following the Form 4 transaction

Key Terms

restricted stock units, tax withholding obligation, Form 4

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"

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What did MarketAxess (MKTX) CEO Christopher Concannon report on this Form 4?

He reported surrendering 349 MarketAxess shares to the company to cover taxes due on vested restricted stock units. This was a tax-withholding disposition, not an open-market sale, and is a routine administrative step tied to equity compensation.

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

Christopher Concannon surrendered 349 shares of MarketAxess common stock at $171.46 per share. These shares were delivered back to the company specifically to satisfy his tax withholding obligation from the vesting of restricted stock units previously granted to him.

Does this MarketAxess (MKTX) Form 4 show an open-market sale by the CEO?

No. The filing describes a tax-withholding disposition, where 349 shares were surrendered to the company to pay taxes on vested restricted stock units. It is not an open-market sale and does not reflect a discretionary trade in the public market.

How many MarketAxess (MKTX) shares does the CEO hold after this transaction?

After surrendering 349 shares for tax withholding, Christopher Concannon holds 53,600 shares of MarketAxess common stock directly. This post-transaction balance shows he retains a substantial equity stake despite the small administrative share disposition.

What price per share is reported in the MarketAxess (MKTX) CEO’s Form 4 transaction?

The Form 4 reports a value of $171.46 per MarketAxess share for the 349-share tax-withholding disposition. This figure is used to measure the value of the shares surrendered to satisfy the CEO’s tax obligation tied to vested restricted stock units.

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

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Accepted by SEC EDGAR 04/06/2026 - 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^*

CONCANNON CHRISTOPHER R

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/03/2026

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	04/03/2026		F(1)		349	D	$171.46	53,600	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 Christopher R. Concannon	04/06/2026
	** 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)