MarketAxess Holdings, Inc.
MARKETAXESS HOLDINGS INC (Form: 4/A, Received: 03/10/2017 16:07:59)
FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Casper Stephen P
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
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

C/O MARKETAXESS HOLDINGS INC., 299 PARK AVENUE
3. Date of Earliest Transaction (MM/DD/YYYY)

8/3/2016
(Street)

NEW YORK, NY 10171
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

8/9/2016 
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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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   8/3/2016     A    763   (1) A $0   (2) 49264   (3) D  
 

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 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 of Derivative Security: 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)  This amendment is being filed to correct the amount of shares granted to the Reporting Person. Due to a processing error, the original Form 4 underreported the amount of shares granted.
( 2)  Represents a grant of restricted stock pursuant to the Company's 2012 Incentive Plan.
( 3)  Represents the amount of shares beneficially owned by the Reporting Person immediately following the reported transaction. As of the filing date of this amendment, the Reporting Person beneficially owns 47,964 shares.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Casper Stephen P
C/O MARKETAXESS HOLDINGS INC.
299 PARK AVENUE
NEW YORK, NY 10171
X



Signatures
/s/ Ori Solomon, as Attorney-in-Fact for Stephen P. Casper 3/10/2017
** 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).
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