EXHIBIT 24

                          LIMITED POWER OF ATTORNEY FOR
                          SECTION 16 REPORTING PURPOSES

                Know all by these presents, that the undersigned hereby makes,
constitutes and appoints each of Charles R. Hood, Antonio L. DeLise and Ori
Solomon, acting individually, as the undersigned's true and lawful
attorney-in-fact, with full power and authority as hereinafter described on
behalf of and in the name, place and stead of the undersigned to:

                (1)     execute for, and on behalf of, the undersigned, in the
undersigned's capacity as an officer and/or director of MarketAxess Holdings
Inc. (the "Company"), Forms 3, 4, and 5 in accordance with Section 16(a) of the
Securities Exchange Act of 1934 and the rules and regulations promulgated
thereunder, as amended from time to time (the "Exchange Act");

                (2)     seek or obtain, as the undersigned's representative and
on the undersigned's behalf, information on transactions in the Company's
securities from any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby authorizes any such
person to release any such information to any attorney-in-fact and further
approves and ratifies any such release of information;

                (3)     do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to prepare, complete and execute
any such Form 3, 4 or 5, and any amendments thereto, or other required report
and timely file such Forms or reports with the United States Securities and
Exchange Commission, the Nasdaq Stock Market and any stock exchange or similar
authority as considered necessary or advisable under Section 16(a) of the
Exchange Act; and

                (4)     take any other action solely in connection with the
matters specifically enumerated above 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 sole discretion.

                The undersigned hereby gives and 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 hereby acknowledges that (a) the foregoing
attorneys-in-fact are serving in such capacity at the request of the
undersigned; (b) this Limited Power of Attorney authorizes, but does not
require, each such attorney-in-fact to act in their discretion on information
provided to such attorney-in-fact without independent verification of such
information; (c) any documents prepared and/or executed by any attorney-in-fact
on behalf of the undersigned pursuant to this Limited Power of Attorney shall be
in such form and shall contain such information and disclosure as such
attorney-in-fact, in his or her sole discretion, deems necessary or advisable;
(d) neither the Company nor any attorney-in-fact assumes (i) any liability for
the undersigned's responsibility to comply with the requirements 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; and (e) this Limited Power
of Attorney does not relieve the undersigned from responsibility for compliance
with the undersigned's obligations under the Exchange Act, including, without
limitation, the reporting requirements under Section 16 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 as to any attorney-in-fact by the
undersigned in a signed writing delivered to such attorney-in-fact. In affixing
his signature to this Power of Attorney, the undersigned hereby revokes any and
all previously executed Powers of Attorney for the same or similar purposes.

                IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 20th day of April, 2012.


                                        /s/ Steven L. Begleiter
                                        ---------------------------------------
                                        Steven L. Begleiter