POWER OF ATTORNEY
FOR SECTION 16 REPORTING OBLIGATIONS
Know all by these presents, that the undersigned hereby makes,
constitutes and appoints each of Scott Pintoff, Jason Edelstein and Antonio
DeLise signing singly, and each acting individually, with the full power of
substitution, the undersigned's true and lawful attorney-in-fact to:
(1) prepare, execute in the undersigned's name and on the
undersigned's behalf, and submit to the U.S. Securities and Exchange Commission
(the "SEC"), a Form ID, including amendments thereto, and any other documents
necessary or appropriate to obtain codes and passwords enabling the undersigned
to make electronic filings with the SEC of reports required by Section 16(a) of
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or any
rule thereunder;
(2) execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer, director and/or stockholder of MarketAxess Holdings Inc.
(the "Company"), Forms 3, 4 and 5 in accordance with Section 16(a) of the
Exchange Act and the rules thereunder;
(3) do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete and execute any such
Form 3, 4 or 5, complete and execute any amendment or amendments thereto, and
file such Form with the SEC and any stock exchange or similar authority; and
(4) take any other action of any type whatsoever in connection with
the foregoing which, in the opinion of such attorney-in-fact, may be of benefit
to, in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approve in such
attorney-in-fact's discretion.
The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this Power of Attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming nor relieving, nor is the Company assuming nor
relieving, any of the undersigned's responsibilities to comply with Section 16
of the Exchange Act or any rule thereunder. The undersigned acknowledges that
neither the Company nor the foregoing attorneys-in-fact assume (i) any liability
for the undersigned's responsibility to comply with the requirement of the
Exchange Act, (ii) any liability of the undersigned for any failure to comply
with such requirements, or (iii) any obligation or liability of the undersigned
for profit disgorgement under Section 16(b) of the Exchange Act.
This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the
undersigned's holdings of, and transactions in, securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorneys-in-fact. Notwithstanding the foregoing, if any
attorney-in-fact appointed hereby hereafter ceases to be an employee of the
Company, then this Power of Attorney shall be automatically revoked solely as to
such individual, immediately upon such cessation, without any further action on
the undersigned's part.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 11th day of February, 2019.
/s/ Nicholas Themelis
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Signature
Nicholas Themelis
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