CAPITAL SECURITY CERTIFICATE

                  THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS OR ANY
OTHER APPLICABLE SECURITIES LAWS. NEITHER THIS SECURITY NOR ANY INTEREST OR
PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED,
ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR
UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT. THE HOLDER OF THIS SECURITY BY ITS
ACCEPTANCE HEREOF AGREES TO OFFER, SELL OR OTHERWISE TRANSFER SUCH SECURITY ONLY
(A) TO THE DEBENTURE ISSUER OR THE TRUST, (B) PURSUANT TO RULE 144A UNDER THE
SECURITIES ACT ("RULE 144A"), TO A PERSON THE HOLDER REASONABLY BELIEVES IS A
"QUALIFIED INSTITUTIONAL BUYER" AS DEFINED IN RULE 144A THAT PURCHASES FOR ITS
OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE
IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (C) PURSUANT
TO AN EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT TO AN
"ACCREDITED INVESTOR" WITHIN THE MEANING OF SUBPARAGRAPH (a) (1), (2), (3) OR
(7) OF RULE 501 UNDER THE SECURITIES ACT THAT IS ACQUIRING THE SECURITY FOR ITS
OWN ACCOUNT, OR FOR THE ACCOUNT OF AN "ACCREDITED INVESTOR," FOR INVESTMENT
PURPOSES AND NOT WITH A VIEW TO, OR FOR OFFER OR SALE IN CONNECTION WITH, ANY
DISTRIBUTION IN VIOLATION OF THE SECURITIES ACT, OR (D) PURSUANT TO ANOTHER
AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT,
SUBJECT TO THE DEBENTURE ISSUER'S AND THE TRUST'S RIGHT PRIOR TO ANY SUCH OFFER,
SALE OR TRANSFER PURSUANT TO CLAUSES (C) OR (D) TO REQUIRE THE DELIVERY OF AN
OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO EACH
OF THEM IN ACCORDANCE WITH THE AMENDED AND RESTATED DECLARATION OF TRUST, A COPY
OF WHICH MAY BE OBTAINED FROM THE DEBENTURE ISSUER OR THE TRUST. THE HOLDER OF
THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES THAT IT WILL COMPLY WITH THE
FOREGOING RESTRICTIONS.

                  THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES,
REPRESENTS AND WARRANTS THAT IT WILL NOT ENGAGE IN HEDGING TRANSACTIONS
INVOLVING THIS SECURITY UNLESS SUCH TRANSACTIONS ARE IN COMPLIANCE WITH THE
SECURITIES ACT.

                  THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF ALSO
AGREES, REPRESENTS AND WARRANTS THAT IT IS NOT AN EMPLOYEE BENEFIT, INDIVIDUAL
RETIREMENT ACCOUNT OR OTHER PLAN OR ARRANGEMENT SUBJECT TO TITLE I OF THE
EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA"), OR
SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE "CODE"),
(EACH A "PLAN"), OR AN ENTITY WHOSE UNDERLYING ASSETS INCLUDE "PLAN ASSETS" BY
REASON OF ANY PLAN'S INVESTMENT IN THE ENTITY AND NO PERSON INVESTING "PLAN
ASSETS"

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OF ANY PLAN MAY ACQUIRE OR HOLD THIS SECURITY OR ANY INTEREST THEREIN, UNLESS
SUCH PURCHASER OR HOLDER IS ELIGIBLE FOR THE EXEMPTIVE RELIEF AVAILABLE UNDER
U.S. DEPARTMENT OF LABOR PROHIBITED TRANSACTION CLASS EXEMPTION 96-23, 95-60,
91-38, 90-1 OR 84-14 OR ANOTHER APPLICABLE EXEMPTION OR ITS PURCHASE AND HOLDING
OF THIS SECURITY IS NOT PROHIBITED BY SECTION 406 OF ERISA OR SECTION 4975 OF
THE CODE WITH RESPECT TO SUCH PURCHASE OR HOLDING. ANY PURCHASER OR HOLDER OF
THIS SECURITY OR ANY INTEREST THEREIN WILL BE DEEMED TO HAVE REPRESENTED BY ITS
PURCHASE AND HOLDING THEREOF THAT EITHER (i) IT IS NOT AN EMPLOYEE BENEFIT PLAN
WITHIN THE MEANING OF SECTION 3(3) OF ERISA, OR A PLAN TO WHICH SECTION 4975 OF
THE CODE IS APPLICABLE, A TRUSTEE OR OTHER PERSON ACTING ON BEHALF OF AN
EMPLOYEE BENEFIT PLAN OR PLAN, OR ANY OTHER PERSON OR ENTITY USING THE ASSETS OF
ANY EMPLOYEE BENEFIT PLAN OR PLAN TO FINANCE SUCH PURCHASE, OR (ii) SUCH
PURCHASE WILL NOT RESULT IN A PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA
OR SECTION 4975 OF THE CODE FOR WHICH THERE IS NO APPLICABLE STATUTORY OR
ADMINISTRATIVE EXEMPTION.

                  IN CONNECTION WITH ANY TRANSFER, THE HOLDER WILL DELIVER TO
THE REGISTRAR AND TRANSFER AGENT SUCH CERTIFICATES AND OTHER INFORMATION AS MAY
BE REQUIRED BY THE AMENDED AND RESTATED DECLARATION OF TRUST TO CONFIRM THAT THE
TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS.

                  THIS SECURITY WILL BE ISSUED AND MAY BE TRANSFERRED ONLY IN
BLOCKS HAVING A LIQUIDATION AMOUNT OF NOT LESS THAN $100,000 AND MULTIPLES OF
$1,000 IN EXCESS THEREOF. ANY ATTEMPTED TRANSFER OF THIS SECURITY IN A BLOCK
HAVING A LIQUIDATION AMOUNT OF LESS THAN $100,000 SHALL BE DEEMED TO BE VOID AND
OF NO LEGAL EFFECT WHATSOEVER. ANY SUCH PURPORTED TRANSFEREE SHALL BE DEEMED NOT
TO BE THE HOLDER OF THIS SECURITY FOR ANY PURPOSE, INCLUDING, BUT NOT LIMITED
TO, THE RECEIPT OF DISTRIBUTIONS ON THIS SECURITY, AND SUCH PURPORTED TRANSFEREE
SHALL BE DEEMED TO HAVE NO INTEREST WHATSOEVER IN THIS SECURITY.

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Certificate Number P-1                       Number of Capital Securities 10,000

                    Certificate Evidencing Capital Securities

                                       of

                        Texas Capital Statutory Trust II

                            Floating Rate MMCapS(SM)

                (liquidation amount $1,000 per Capital Security)

                  Texas Capital Statutory Trust II, a statutory trust created
under the laws of the State of Delaware (the "Trust"), hereby certifies that
JPMorgan Chase Bank, as Trustee for the benefit of the Noteholders of MM
Community Funding IX, Ltd. (the "Holder") is the registered owner of 10,000
capital securities of the Trust representing undivided beneficial interests in
the assets of the Trust, designated the Floating Rate MMCapS(SM) (liquidation
amount $1,000 per Capital Security) (the "Capital Securities"). Subject to the
Declaration (as defined below), the Capital Securities are transferable on the
books and records of the Trust, in person or by a duly authorized attorney, upon
surrender of this Certificate duly endorsed and in proper form for transfer. The
Capital Securities represented hereby are issued pursuant to, and the
designation, rights, privileges, restrictions, preferences and other terms and
provisions of the Capital Securities shall in all respects be subject to, the
provisions of the Amended and Restated Declaration of Trust of the Trust, dated
as of April 10, 2003, among Raleigh Hortenstine III and Joseph M. Grant, as
Administrators, Wilmington Trust Company, as Delaware Trustee, Wilmington Trust
Company, as Institutional Trustee, Texas Capital Bancshares, Inc., as Sponsor,
and the holders from time to time of undivided beneficial interests in the
assets of the Trust, including the designation of the terms of the Capital
Securities as set forth in Annex I to the Declaration, as the same may be
amended from time to time (the "Declaration"). Capitalized terms used herein but
not defined shall have the meaning given them in the Declaration. The Holder is
entitled to the benefits of the Guarantee to the extent provided therein. The
Sponsor will provide a copy of the Declaration, the Guarantee, and the Indenture
to the Holder without charge upon written request to the Sponsor at its
principal place of business.

                  By acceptance of this Security, the Holder is bound by the
Declaration and is entitled to the benefits thereunder.

                  By acceptance of this Security, the Holder agrees to treat,
for United States federal income tax purposes, the Debentures as indebtedness
and the Capital Securities as evidence of beneficial ownership in the
Debentures.

                  This Capital Security is governed by, and shall be construed
in accordance with, the laws of the State of Delaware, without regard to
principles of conflict of laws.

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                  IN WITNESS WHEREOF, the Trust has duly executed this
certificate.

                                           Texas Capital Statutory Trust II

                                           By: /s/ RALEIGH HORTENSTINE III
                                              ----------------------------------
                                              Name: Raleigh Hortenstine III
                                              Title: Administrator

                                           Dated: April 10, 2003

                          CERTIFICATE OF AUTHENTICATION

                  This is one of the Capital Securities referred to in the
within-mentioned Declaration.

                                           Wilmington Trust Company,
                                           not in its individual capacity but
                                           solely as the Institutional Trustee

                                           By: /s/ DONALD G. MACKELCAN
                                              ----------------------------------
                                              Authorized Officer

                                           Dated: April 10, 2003

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                              [REVERSE OF SECURITY]

                  Distributions payable on each Capital Security will be payable
at a variable per annum rate of interest, reset quarterly, equal to LIBOR (as
defined in the Declaration) plus 3.25% (the "Coupon Rate") of the stated
liquidation amount of $1,000 per Capital Security, such rate being the rate of
interest payable on the Debentures to be held by the Institutional Trustee.
Except as set forth below in respect of an Extension Period, Distributions in
arrears for more than one quarterly period will bear interest thereon compounded
quarterly at the applicable Coupon Rate for each such quarterly period (to the
extent permitted by applicable law). The term "Distributions" as used herein
includes cash distributions, any such compounded distributions and any
Additional Amounts payable on the Debentures unless otherwise stated. A
Distribution is payable only to the extent that payments are made in respect of
the Debentures held by the Institutional Trustee and to the extent the
Institutional Trustee has funds legally available in the Property Account
therefor. The amount of Distributions payable for any period will be computed
for any full quarterly Distribution period on the basis of a 360-day year and
the actual number of days elapsed in the relevant Distribution period.

                  Except as otherwise described below, Distributions on the
Capital Securities will be cumulative, will accrue from the date of original
issuance and will be payable quarterly in arrears on January 24, April 24, July
24 and October 24 of each year, commencing on July 24, 2003 (each, a
"Distribution Payment Date"). The Debenture Issuer has the right under the
Indenture to defer payments of interest on the Debentures by extending the
interest payment period for up to 20 consecutive quarterly periods (each, an
"Extension Period") at any time and from time to time on the Debentures, subject
to the conditions described below, during which Extension Period no interest
shall be due and payable. During any Extension Period, interest will continue to
accrue on the Debentures, and interest on such accrued interest (such accrued
interest and interest thereon referred to herein as "Deferred Interest") will
accrue at an annual rate equal to the Coupon Rate in effect for each such
Extension Period, compounded quarterly from the date such Deferred Interest
would have been payable were it not for the Extension Period, to the extent
permitted by law. No Extension Period may end on a date other than a
Distribution Payment Date. At the end of any such Extension Period, the
Debenture Issuer shall pay all Deferred Interest then accrued and unpaid on the
Debentures; provided, however, that no Extension Period may extend beyond the
Maturity Date, Redemption Date or Special Redemption Date. Prior to the
termination of any Extension Period, the Debenture Issuer may further extend
such period, provided, that such period together with all such previous and
further consecutive extensions thereof shall not exceed 20 consecutive quarterly
periods, or extend beyond the Maturity Date. Upon the termination of any
Extension Period and upon the payment of all Deferred Interest, the Debenture
Issuer may commence a new Extension Period, subject to the foregoing
requirements. No interest or Deferred Interest shall be due and payable during
an Extension Period, except at the end thereof, but Deferred Interest shall
accrue upon each installment of interest that would otherwise have been due and
payable during such Extension Period until such installment is paid. The
deferral of the payment of interest during and Extension Period shall not defer
the payment of any Additional Amounts that may be due. If Distributions are
deferred, the Distributions due shall be paid on the date that the related
Extension Period terminates to Holders of the Securities as they appear on the
books and records of the Trust on the record date immediately preceding such
date. Distributions on the Securities must be paid on the dates payable (after
giving effect to any Extension Period) to the extent that the Trust has funds
legally available for the payment of such distributions in the Property Account
of the Trust. The Trust's funds available for Distribution to the Holders of the

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Securities will be limited to payments received from the Debenture Issuer. The
payment of Distributions out of moneys held by the Trust is guaranteed by the
Guarantor pursuant to the Guarantee.

                  The Capital Securities shall be redeemable as provided in the
Declaration.

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                                   ASSIGNMENT

                  FOR VALUE RECEIVED, the undersigned assigns and transfers this
Capital Security Certificate to:

(Insert assignee's social security or tax identification number)

(Insert address and zip code of assignee),

and irrevocably appoints
as agent to transfer this Capital Security Certificate on the books of the
Trust. The agent may substitute another to act for it, him or her.

                  Date:

                  Signature:

                  (Sign exactly as your name appears on the other side of this
Capital Security Certificate)

                  Signature Guarantee:(1)

- -----------------------

(1)      Signature must be guaranteed by an "eligible guarantor institution"
that is a bank, stockbroker, savings and loan association or credit union
meeting the requirements of the Security registrar, which requirements include
membership or participation in the Securities Transfer Agents Medallion Program
("STAMP") or such other "signature guarantee program" as may be determined by
the Security registrar in addition to, or in substitution for, STAMP, all in
accordance with the Securities Exchange Act of 1934, as amended.

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