First Supplemental Indenture, dated as of August 7, 2006

FIRST SUPPLEMENTAL INDENTURE, dated as of August 7, 2006 (this “First Supplemental Indenture”), between PLAINS CAPITAL CORPORATION, a Texas corporation (the “Company”), and U.S. BANK NATIONAL ASSOCIATION (as successor to State Street Bank and Trust Company of Connecticut, National Association), a national banking association, as trustee (the “Trustee”).

WHEREAS, the Company and the Trustee have duly authorized, executed and delivered an indenture, dated as of July 31, 2001 (the “Original Indenture”), to govern the terms of and to provide for the authentication and delivery of the Company’s Junior Subordinated Deferrable Interest Debentures due 2031 (the “Debentures”); and

WHEREAS, Section 9.2 of the Original Indenture provides that the Company and the Trustee may, with the consent of the Securityholders, enter into an indenture supplemental to the Original Indenture to, among other things, modify the rate of interest on the Debentures; and

WHEREAS, the Company and the Trustee desire to amend the Original Indenture as hereinafter provided to modify the rate of interest on the Debentures and to make certain other modifications.

WHEREAS, in order to reflect the amendments contemplated hereby, the Debentures will be amended and restated by the form Debentures attached hereto as Exhibit A.

NOW, THEREFORE, in consideration of the premises and of the covenants herein contained and of other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Company and the Trustee agree as follows:

Section 1. Defined Terms. All capitalized terms used herein which are defined in the Original Indenture, either directly or by reference therein, shall have the respective meanings assigned them in the Indenture except as otherwise provided herein or unless the context otherwise requires.

(a) In this First Supplemental Indenture, unless a clear contrary intention appears:

(iii) the words “herein” “hereof “hereto” and “hereunder” and other words of similar import refer to this First Supplemental Indenture as a whole and not to any particular Section or other subdivision;

(iv) reference to any Person includes such Persons’ successors and assigns but, if applicable, only if such successors and assigns are permitted by this First Supplemental Indenture or the Original Indenture, and reference to a Person in a particular capacity excludes such Person in any other capacity or individually provided that nothing in this clause (iv) is intended to authorize any assignment not otherwise permitted by this First Supplemental Indenture or the Original Indenture;

(v) reference to any agreement, document or instrument means such agreement, document or instrument as amended, supplemented or modified and in effect from time to time in accordance with the terms thereof and, if applicable, the terms hereof, as well as any substitution or replacement therefore and reference to any note includes modifications thereof and any note issued in extension or renewal thereof or in substitution or replacement therefore;

(vi) reference to any Section means such Section of this First Supplemental Indenture; and

(vii) the word “including” (and with correlative meaning “include”) means including without limiting the generality of any description preceding such term.

(b) No provision in this First Supplemental Indenture shall be interpreted or construed against any Person because that Person or its legal representative drafted such provision.

(a) Section 1.1 of the Original Indenture is hereby amended to include the following defined terms:

“Acceleration Event of Default” means an Event of Default under Section 5.1(a), (d), (e) or (f), whatever the reason for such Acceleration Event of Default and whether it shall be voluntary or involuntary or be effected by operation of law or pursuant to any judgment, decree or order of any court or any order, rule or regulation of any administrative or governmental body.

(b) Section 1.1 of the Original Indenture is hereby amended to delete the following defined terms in their entirety and restate such defined terms as follows:

“Additional Interest” has the meaning set forth in Section 2.11 as amended and supplemented hereby.

“Capital Treatment Event” means the receipt by the Company and the Trust of an opinion of counsel experienced in such matters to the effect that, as a result of the occurrence of any amendment to, or change (including any announced prospective change) in, the laws, rules or regulations of the United States or any political subdivision thereof or therein, or as the result of any official or administrative pronouncement or action or decision interpreting or applying such laws, rules or regulations, which amendment or change is effective or which pronouncement, action or decision is announced on or after August 7, 2006, there is more than an insubstantial risk that the Company will not, within 90 days of the date of such opinion, be entitled to treat an amount equal to the aggregate liquidation amount of the Capital Securities as “Tier 1 Capital” (or its then equivalent) for purposes of the capital adequacy guidelines of the Federal Reserve, as then in effect and applicable to the Company (or if the Company is not a bank holding company or is otherwise not subject to the Federal Reserve’s risk-based capital adequacy guidelines, such guidelines applied to the Company as if the Company were subject to such guidelines); provided, however, that the inability of the Company to treat all or any portion of the liquidation amount of the Capital Securities as Tier 1 Capital shall not constitute the basis for a Capital Treatment Event, if such inability results from the Company having cumulative preferred stock, minority interests in consolidated subsidiaries, or any other class of security or interest which the Federal Reserve or OTS, as applicable, may now or hereafter accord Tier 1 Capital treatment in excess of the amount which may now or hereafter qualify for treatment as Tier 1 Capital under

applicable capital adequacy guidelines; provided further, however, that the distribution of Debentures in connection with the liquidation of the Trust shall not in and of itself constitute a Capital Treatment Event unless such liquidation shall have occurred in connection with a Tax Event or an Investment Company Event.

“Distribution Period” means (i) with respect to interest paid on the Interest Payment Date in October 2006, the period beginning on (and including) July 31, 2006 and ending on (but excluding) the Interest Payment Date in October 2006, and (ii) thereafter, with respect to interest paid on each successive Interest Payment Date, the period beginning on (and including) the preceding Interest Payment Date and ending on (but excluding) such current Interest Payment Date.

“First Supplemental Indenture” has the meaning set forth in the introductory paragraph hereto.

“Indenture” means the Original Indenture, as supplemented and amended by the First Supplemental Indenture.

“Interest Rate” means (i) for the period beginning on (and including) July 31, 2006 to (and excluding) August 7, 2006 the rate determined under the Original Indenture for such period, (ii) for the period beginning on (and including) August 7, 2006 and ending on (but excluding) the Interest Payment Date in October 2006 the rate per annum of 8.785%, and (iii) for each Distribution Period beginning on or after the Interest Payment Date in October 2006, the Coupon Rate for such Distribution Period. For purposes of clarification, the Interest Rate from the date of original issuance to (but excluding) August 7, 2006 (including the period from (and including) July 31, 2006 and ending on (but excluding) August 7, 2006) shall be as determined under the Original Indenture.

“Redemption Price” means 100% of the principal amount of the Debentures being redeemed, plus accrued and unpaid interest (including any Additional Interest) on such Debentures to the Redemption Date.

“Senior Indebtedness” means, with respect to the Company, (i) the principal, premium, if any, and interest in respect of (A) indebtedness of the Company for all borrowed and purchased money and (B) indebtedness evidenced by securities, debentures, notes, bonds or other similar instruments issued by the Company; (ii) all capital lease obligations of the Company; (iii) all obligations of the Company issued or assumed as the deferred purchase price of property, all conditional sale obligations of the Company and all obligations of the Company under any title retention agreement; (iv) all obligations of the Company for the reimbursement of any letter of credit, any banker’s acceptance, any security purchase facility, any repurchase agreement or similar arrangement, any interest rate swap, any other hedging arrangement, any obligation under options or any similar credit or other transaction; (v) all obligations of the Company associated with derivative products such as interest and foreign exchange rate contracts, commodity contracts, and similar arrangements; (vi) all obligations of the type referred to in clauses (i) through (v) above of other Persons for the payment of which the Company is responsible or liable as obligor, guarantor or otherwise including, without limitation, similar obligations arising from off-balance sheet guarantees and direct credit substitutes; and (vii) all obligations of the type referred to in clauses (i) through (vi) above of other Persons secured by any lien on any property or asset of the Company (whether or not such obligation is assumed by

the Company), whether incurred on or prior to the date of this Indenture or thereafter incurred. Notwithstanding the foregoing, “Senior Indebtedness” shall not include (1) any Additional Junior Indebtedness, (2) Debentures issued pursuant to this Indenture and guarantees in respect of such Debentures, (3) trade accounts payable of the Company arising in the ordinary course of business (such trade accounts payable being pari passu in right of payment to the Debentures), or (4) obligations with respect to which (a) in the instrument creating or evidencing the same or pursuant to which the same is outstanding, it is provided that such obligations are pari passu, junior or otherwise not superior in right of payment to the Debentures and (b) the Company, prior to the issuance thereof, has notified (and, if then required under the applicable guidelines of the regulating entity, has received approval from) the Federal Reserve (if the Company is a bank holding company) or the OTS (if the Company is a savings and loan holding company). Senior Indebtedness shall continue to be Senior Indebtedness and be entitled to the subordination provisions irrespective of any amendment, modification or waiver of any term of such Senior Indebtedness.

“Special Redemption Price” means (i) if the Special Redemption Date is before July 31, 2011, an amount in cash equal to 107.5% of the principal amount of the Debentures to be prepaid, plus accrued and unpaid interest (including Additional Interest) on such Debentures to such Special Redemption Date, or (ii) if the Special Redemption Date is on or after July 31, 2011, an amount equal to 100% of the principal amount of the Debentures being redeemed, plus accrued and unpaid interest (including any Additional Interest) on such Debentures to such Special Redemption Date.

“Trustee” means U.S. Bank National Association, and, subject to the provisions of Article VI hereof, shall also include its successors and assigns as Trustee hereunder.

Section 4. Amendment of Section 2.3 of the Indenture. The first two sentences of Section 2.3 of the Original Indenture are deleted in their entirety and the following shall appear in lieu thereof:

The Debentures shall be substantially in the form of Exhibit A attached hereto. The Debentures shall be in registered, certificated form without coupons and in minimum denominations of $100,000.00 and any multiple of $1,000.00 in excess thereof. Any attempted transfer of the Debentures in a block having an aggregate principal amount of less than $100,000.00 shall be deemed to be void and of no legal effect whatsoever.

Section 5. Amendment of Section 2.5 of the Indenture. The seventh through tenth paragraphs of Section 2.5 of the Original Indenture are deleted in their entirety and the following shall appear in lieu thereof:

THIS SECURITY IS NOT A SAVINGS ACCOUNT OR DEPOSIT AND IT IS NOT INSURED BY THE UNITED STATES OR ANY AGENCY OR FUND OF THE UNITED STATES, INCLUDING THE FEDERAL DEPOSIT INSURANCE CORPORATION.

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 AND ANY APPLICABLE STATE SECURITIES LAWS. THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES TO OFFER, SELL OR OTHERWISE TRANSFER THIS SECURITY ONLY (A) TO THE COMPANY, (B) PURSUANT TO A REGISTRATION STATEMENT THAT HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A SO LONG AS THIS SECURITY IS ELIGIBLE FOR RESALE PURSUANT TO RULE 144A IN ACCORDANCE WITH RULE 144A, (D) TO A NON-U.S. PERSON IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 903 OR RULE 904 (AS APPLICABLE) OF REGULATION S UNDER THE SECURITIES ACT, (E) TO AN INSTITUTIONAL “ACCREDITED INVESTOR” WITHIN THE MEANING OF SUBPARAGRAPH (A) (1), (2), (3) or (7) OF RULE 501 UNDER THE SECURITIES ACT THAT IS ACQUIRING THIS SECURITY FOR ITS OWN ACCOUNT, OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL “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 (F) PURSUANT TO ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO THE COMPANY’S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO IT IN ACCORDANCE WITH THE INDENTURE, A COPY OF WHICH MAY BE OBTAINED FROM THE COMPANY.

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” OF ANY PLAN MAY ACQUIRE OR HOLD THE SECURITIES OR ANY INTEREST THEREIN, UNLESS SUCH PURCHASER OR HOLDER IS ELIGIBLE FOR 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 THE SECURITIES 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.

THIS SECURITY WILL BE ISSUED AND MAY BE TRANSFERRED ONLY IN BLOCKS HAVING AN AGGREGATE PRINCIPAL AMOUNT OF NOT LESS THAN $100,000.00 AND MULTIPLES OF $1,000.00 IN EXCESS THEREOF. ANY ATTEMPTED TRANSFER OF THIS SECURITY IN A BLOCK HAVING AN AGGREGATE PRINCIPAL AMOUNT OF LESS THAN $100,000.00 SHALL BE DEEMED TO BE VOID AND OF NO LEGAL EFFECT WHATSOEVER.

THE HOLDER OF THIS SECURITY AGREES THAT IT WILL COMPLY WITH THE FOREGOING RESTRICTIONS.

Section 6. Amendment of Section 2.8 of the Indenture. The first two paragraphs of Section 2.8 of the Original Indenture are hereby amended and restated in their entirety to read as follows:

Interest at the Interest Rate and any Additional Interest on any Debenture that is payable, and is punctually paid or duly provided for, on any Interest Payment Date for Debentures shall be paid to the Person in whose name said Debenture (or one or more Predecessor Securities) is registered at the close of business on the regular record date for such interest installment except that interest and any Additional Interest payable on the Maturity Date shall be paid to the Person to whom principal is paid.

Each Debenture shall bear interest (i) for the period beginning on (and including) July 31, 2006 to (and excluding) August 7, 2006 the rate determined under the Original Indenture for such period, (ii) for the period beginning on (and including) August 7, 2006 and ending on (but excluding) the Interest Payment Date in October 2006 the rate per annum of 8.785%, and (iii) for each Distribution Period beginning on or after the Interest Payment Date in October 2006 at a rate per annum equal to the 3-Month LIBOR, determined as described in Section 2.10, plus 3.30% (the “Coupon Rate”) applied to the principal amount thereof, until the principal thereof becomes due and payable, and on any overdue principal and to the extent that payment of such interest is enforceable under applicable law (without duplication) on any overdue installment of interest (including Additional Interest) at the Interest Rate in effect for each applicable period compounded quarterly; provided, however, that prior to the Interest Payment Date in July 2011, the Coupon Rate shall not exceed 12.50%. Interest shall be payable (subject to any relevant Extension Period) quarterly in arrears on each Interest Payment Date, including the Interest Payment Date in October 2006. For purposes of clarification, the Interest Rate from the date of original issuance to (but excluding) August 7, 2006 (including the period from (and including) July 31, 2006 and ending on (but excluding) August 7, 2006) shall be as determined under the Original Indenture.

Section 7. Amendment of Section 2.10 of the Indenture. The introductory paragraph and subsection (a) of Section 2.10 of the Original Indenture are hereby amended and restated to read as follows:

The amount of interest payable for each Distribution Period will be calculated by applying the Interest Rate to the principal amount outstanding at the commencement of the Distribution Period on the basis of the actual number of days in the Distribution Period concerned divided by 360. All percentages resulting from any calculations on the Debentures will be rounded, if necessary, to the nearest one hundred-thousandth of a percentage point, with five one-millionths of a percentage point rounded upward (e.g., 9.876545% (or .09876545) being rounded to 9.87655% (or .0987655), and all dollar amounts used in or resulting from such calculation will be rounded to the nearest cent (with one-half cent being rounded upward)).

(a) “3-Month LIBOR” means the London interbank offered interest rate for three-month, U.S. dollar deposits determined by the Trustee in the following order of priority:

(1) the rate (expressed as a percentage per annum) for U.S. dollar deposits having a three-month maturity that appears on Telerate Page 3750 as of 11:00 a.m. (London time) on the related Determination Date (as defined below). “Telerate Page 3750” means the display designated as “Page 3750” on the Moneyline Telerate Service or such other page as may replace Page 3750 on that service or such other service or services as may be nominated by the British Bankers’ Association as the information vendor for the purpose of displaying London interbank offered rates for U.S. dollar deposits;

(2) if such rate cannot be identified on the related Determination Date, the Trustee will request the principal London offices of four leading banks in the London interbank market to provide such banks’ offered quotations (expressed as percentages per annum) to prime banks in the London interbank market for U.S. dollar deposits having a three-month maturity as of 11.00 a.m. (London time) on such Determination Date. If at least two quotations are provided, 3-Month LIBOR will be the arithmetic mean of such quotations;

(3) if fewer than two such quotations are provided as requested in clause (2) above, the Trustee will request four major New York City banks to provide such banks’ offered quotations (expressed as percentages per annum) to leading European banks for loans in U.S. dollars as of 11:00 a.m. (London time) on such Determination Date. If at least two such quotations are provided, 3-Month LIBOR will be the arithmetic mean of such quotations; and

(4) if fewer than two such quotations are provided as requested in clause (3) above, 3-Month LIBOR will be a 3-Month LIBOR determined with respect to the Distribution Period immediately preceding such current Distribution Period.

If the rate for U.S. dollar deposits having a three-month maturity that initially appears on Telerate Page 3750 as of 11:00 a.m. (London time) on the related Determination Date is superseded on the Telerate Page 3750 by a corrected rate by 12:00 noon (London time) on such Determination Date, then the corrected rate as so substituted on the applicable page will be the applicable 3-Month LIBOR for such Determination Date.

The Interest Rate for any Distribution Period will at no time be higher than the maximum rate then permitted by New York law as the same may be modified by United States law.

“Determination Date” means the date that is two London Banking Days (i.e., a business day in which dealings in deposits in U.S. dollars are transacted in the London interbank market) preceding the particular Distribution Period for which a Coupon Rate is being determined.

Section 8. Amendment of Section 2.11 of the Indenture. Section 2.11 of the Original Indenture is hereby amended and restated in its entirety to read as follows:

So long as no Acceleration Event of Default has occurred and is continuing, the Company shall have the right, from time to time, and without causing an Event of Default, to defer payments of interest on the Debentures by extending the interest payment period on the Debentures at any time and from time to time during the term of the Debentures, for up to 20 consecutive quarterly periods (each such extended interest payment period, an “Extension Period”), during which Extension Period no interest (including Additional Interest) shall be due and payable (except any Additional Sums that may be due and payable). No Extension Period may end on a date other than an Interest Payment Date. During an Extension Period, interest will continue to accrue on the Debentures, and interest on such accrued interest will accrue at an annual rate equal to the Interest Rate in effect for such Extension Period, compounded quarterly from the date such interest would have been payable were it not for the Extension Period, to the extent permitted by law (such interest referred to herein as “Additional Interest”). At the end of any such Extension Period the Company shall pay all interest then accrued and unpaid on the Debentures (together with Additional Interest thereon); provided, however, that no Extension Period may extend beyond the Maturity Date; provided further, however, that during any such Extension Period, the Company shall not and shall not permit any Affiliate to (i) declare or pay any dividends or distributions on, or redeem, purchase, acquire, or make a liquidation payment with respect to, any of the Company’s or such Affiliate’s capital stock (other than payments of dividends or distributions to the Company or payments of dividends from direct or indirect subsidiaries of the Company to their parent corporations, which also shall be direct or indirect subsidiaries of the Company) or make any guarantee payments with respect to the foregoing or (ii) make any payment of principal of or interest or premium, if any, on or repay, repurchase or redeem any debt securities of the Company or any Affiliate that rank pari passu in all respects with or junior in interest to the Debentures (other than, with respect to clauses (i) or (ii) above, (a) repurchases, redemptions or other acquisitions of shares of capital stock of the Company in connection with any employment contract, benefit plan or other similar arrangement with or for the benefit of one or more employees, officers, directors or consultants, in connection with a dividend reinvestment or stockholder stock purchase plan or in connection with the issuance of capital stock of the Company (or securities convertible into or exercisable for such capital stock) as consideration in an acquisition transaction entered into prior to the applicable Extension Period, (b) as a result of any exchange or conversion of any class or series of the Company’s capital stock (or any capital stock of a subsidiary of the Company) for any class or series of the Company’s capital stock or of any class or series of the Company’s indebtedness for any class or series of the Company’s capital stock, (c) the purchase of fractional interests in shares of the Company’s capital stock pursuant to the conversion or exchange provisions of such capital stock or the security being converted or exchanged, (d) any declaration of a dividend in connection with any stockholders’ rights plan, or the issuance of rights, stock or other property under any stockholders’ rights plan, or the redemption or repurchase of rights pursuant thereto, (e) any dividend in the form of stock, warrants, options or other rights where the dividend stock or the stock issuable upon exercise of such warrants,

options or other rights is the same stock as that on which the dividend is being paid or ranks pari passu with or junior to such stock and any cash payments in lieu of fractional shares issued in connection therewith, (f) payments of principal or interest on debt securities or payments of cash dividends or distributions on any capital stock issued by an Affiliate that is not, in whole or in part, a subsidiary of the Company (or any redemptions, repurchases or liquidation payments on such stock or securities), or (g) payments under the Capital Securities Guarantee). Prior to the termination of any Extension Period, the Company 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 accrued and unpaid interest and Additional Interest, the Company may commence a new Extension Period, subject to the foregoing requirements. No interest or Additional Interest shall be due and payable during an Extension Period, except at the end thereof, but each installment of interest that would otherwise have been due and payable during such Extension Period shall bear Additional Interest to the extent permitted by applicable law. The Company must give the Trustee notice of its election to begin or extend an Extension Period by the close of business at least 15 Business Days prior to the Interest Payment Date with respect to which interest on the Debentures would have been payable except for the election to begin or extend such Extension Period. The Trustee shall give notice of the Company’s election to begin a new Extension Period to the Securityholders.

Section 9. Amendment of Section 5.1(a) of the Indenture. Section 5.1 (a) of the Original Indenture is hereby amended and restated to read as follows:

(a) the Company defaults in the payment of any interest upon any Debenture, including any Additional Interest in respect thereof, following the nonpayment of any such interest for twenty or more consecutive Distribution Periods; or

Section 10. Amendment of Section 5.1(f) of the Indenture. The second paragraph of Section 5.1(f) of the Original Indenture is hereby amended and restated to read as follows:

If an Acceleration Event of Default occurs and is continuing with respect to the Debentures, then, and in each and every such case, unless the principal of the Debentures shall have already become due and payable, either the Trustee or the holders of not less than 25% in aggregate principal amount of the Debentures then outstanding hereunder, by notice in writing to the Company (and to the Trustee if given by Securityholders), may declare the entire principal of the Debentures and the interest accrued thereon, if any, to be due and payable immediately, and upon any such declaration the same shall become immediately due and payable. If an Event of Default under Section 5.1(b) or (c) occurs and is continuing with respect to the Debentures, then, and in each and every such case, unless the principal of the Debentures shall have already become due and payable, either the Trustee or the holders of not less than 25% in aggregate principal amount of the Debentures then outstanding hereunder, by notice in writing to the Company (and to the Trustee if given by Securityholders), may proceed to remedy the default or breach thereunder by such appropriate judicial proceedings as the Trustee or such holders shall deem most effectual to remedy the defaulted covenant or enforce the provisions of this Indenture so breached, either by suit in equity or by action at law, for damages or otherwise.

Section 11. Amendment of Section 5.2 of the Indenture. The first paragraph of Section 5.2 of the Original Indenture is hereby amended and restated in its entirety to read as follows:

The Company covenants that upon the occurrence of an Event of Default pursuant to Section 5.1 (a) or (b) then, upon demand of the Trustee, the Company will pay to the Trustee, for the benefit of the holders of the Debentures the whole amount that then shall have become due and payable on all Debentures for principal and premium, if any, or interest, or both, as the case may be, with Additional Interest accrued on the Debentures (to the extent that payment of such interest is enforceable under applicable law and, if the Debentures are held by the Trust or a trustee of such Trust, without duplication of any other amounts paid by the Trust or a trustee in respect thereof); and, in addition thereto, such further amount as shall be sufficient to cover the costs and expenses of collection, including a reasonable compensation to the Trustee, its agents, attorneys and counsel, and any other amounts due to the Trustee under Section 6.6. In case the Company shall fail forthwith to pay such amounts upon such demand, the Trustee, in its own name and as trustee of an express trust, shall be entitled and empowered to institute any actions or proceedings at law or in equity for the collection of the sums so due and unpaid, and may prosecute any such action or proceeding to judgment or final decree, and may enforce any such judgment or final decree against the Company or any other obligor on such Debentures and collect in the manner provided by law out of the property of the Company or any other obligor on such Debentures wherever situated the moneys adjudged or decreed to be payable.

Section 12. Amendment of Section 10.1 of the Indenture. Section 10.1 of the Original Indenture is hereby amended and restated in its entirety to read as follows:

The Company shall have the right (subject to the receipt by the Company of prior approval (i) if the Company is a bank holding company, from the Federal Reserve, if then required under applicable capital guidelines or policies or (ii) if the Company is a savings and loan holding company, from the OTS if then required under applicable capital guidelines or policies of the OTS), to redeem the Debentures, in whole or in part, but in all cases in a principal amount with integral multiples of $1,000.00, on any Interest Payment Date on or after the Interest Payment Date in July 2011 (the “Redemption Date”), at the Redemption Price.

Section 13. Amendment of Section 14.4 of the Indenture. The second sentence of Section 14.4 of the Original Indenture is hereby amended and restated in its entirety to read as follows:

Any notice, consent, direction, request, authorization, waiver or demand by any Securityholder or the Company to or upon the Trustee shall be deemed to have been sufficiently given or made, for all purposes, if given or made in writing at the office of the Trustee, addressed to the Trustee, 225 Asylum Street, Goodwin Square, Hartford, Connecticut 06103 Attention: Vice President, Corporate Trust Services Division, with a copy to the Trustee, 1 Federal Street - 3rd Floor, Boston, Massachusetts 02110, Attention: Paul D. Allen, Corporate Trust Services Division.

Section 14. Amendment of Exhibit A to the Original Indenture. Exhibit A of the Original Indenture is hereby amended and restated in its entirety as set forth on Exhibit A hereto.

Section 15. Representations and Warranties. The Company represents and warrants that (a) it has all necessary power and authority to execute and deliver this First Supplemental Indenture and to perform under the Indenture, (b) that it is a corporation organized and existing under the laws of the State of Texas, (c) that, both immediately before and after giving effect to this First Supplemental Indenture, no Default or Event of Default has occurred and is continuing, (d) that this First Supplemental Indenture is executed and delivered pursuant to Section 9.2 of the Original Indenture, (e) that the Company has no present intention to exercise its right under Section 2.11 of the Indenture to defer payments of interest on the Debentures by commencing an Extension Period; and (f) that each holder of outstanding Debentures has consented hereto.

Section 16. Conditions of Effectiveness. This First Supplemental Indenture shall become effective when, and only when:

(a) the Trustee shall have executed a counterpart of this First Supplemental Indenture and shall have received a counterpart of this First Supplemental Indenture executed by the Company;

(b) the Trustee shall have received an Officers’ Certificate stating that this First Supplemental Indenture complies with Article IX of the Original Indenture; and

(c) the Trustee shall have received an Opinion of Counsel, in form and substance satisfactory to it, to the effect that the execution and delivery of this First Supplemental Indenture is permitted by and is effected in compliance with the Original Indenture.

Section 17. Surrender and Exchange of Debentures. The holder of the Debentures issued under the Original Indenture shall be required to surrender such Debentures to the Trustee for exchange in accordance with the provisions of Section 2.5 of the Indenture. Upon receipt of such Debentures, the Trustee shall surrender such Debentures to the Company for cancellation. Upon the effectiveness of this First Supplemental Indenture, the terms of the Debentures as set forth on Exhibit A hereto shall govern in all respects regardless of whether each Debenture issued under the Original Indenture is surrendered in exchange as required under this Section 17. In the event of a conflict between the terms of the Debentures issued under the Original Indenture and the Debentures issued in the form attached hereto as Exhibit A, the terms of the Debentures in the form attached hereto as Exhibit A shall control.

(a) Upon the effectiveness of this First Supplemental Indenture, each reference in the Original Indenture to “this Indenture,” “hereunder,” “herein” or words of like import shall mean and be a reference to the Original Indenture, as affected, amended and supplemented hereby.

(b) Upon the effectiveness of this First Supplemental Indenture, all references in each of the Debentures, and in the other documents and instruments executed in connection therewith, to the Indenture, including each term defined by reference to the Indenture, shall mean and be a reference to the Original Indenture or such term, as the case may be, as affected, amended and supplemented hereby.

(c) The Original Indenture, as amended and supplemented by this First Supplemental Indenture, shall remain in full force and effect and is hereby ratified and confirmed.

Section 19. Execution in Counterparts. This First Supplemental Indenture may be executed in any number of counterparts and by different parties hereto in separate counterparts, each of which when so executed and delivered shall be deemed to be an original and all of which when taken together shall constitute but one and the same instrument.

Section 20. Governing Law; Binding Effect. This First Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York and shall be binding upon the parties hereto and their respective successors and assigns.

Section 21. The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this First Supplemental Indenture or the due execution thereof by the Company. The recitals of fact contained herein shall be taken as the statements solely of the Company, and the Trustee assumes no responsibility for the correctness thereof.

IN WITNESS WHEREOF, the parties have caused this First Supplemental Indenture to be duly executed by their respective officers thereunto duly authorized, as of the day and year first above written.


PLAINS CAPITAL CORPORATION, as Company

By:		/s/ Alan B. White
Name:		Alan B. White
Title		CEO


U.S. BANK NATIONAL ASSOCIATION (as successor to State Street Bank and Trust Company of Connecticut, National Association), as Trustee

By:		/s/ Paul D. Allen
Name:		Paul D. Allen
Title:		Vice President

THIS SECURITY IS NOT A SAVINGS ACCOUNT OR DEPOSIT AND IT IS NOT INSURED BY THE UNITED STATES OR ANY AGENCY OR FUND OF THE UNITED STATES, INCLUDING THE FEDERAL DEPOSIT INSURANCE CORPORATION.

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), ANY STATE SECURITIES LAWS OR ANY OTHER APPLICABLE SECURITIES LAW. 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 AND ANY APPLICABLE STATE SECURITIES LAWS. THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES TO OFFER, SELL OR OTHERWISE TRANSFER THIS SECURITY ONLY (A) TO THE COMPANY, (B) PURSUANT TO A REGISTRATION STATEMENT THAT HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A SO LONG AS THIS SECURITY IS ELIGIBLE FOR RESALE PURSUANT TO RULE 144A IN ACCORDANCE WITH RULE 144A, (D) TO A NON-U.S. PERSON IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 903 OR RULE 904 (AS APPLICABLE) OF REGULATION S UNDER THE SECURITIES ACT, (E) TO AN INSTITUTIONAL “ACCREDITED INVESTOR” WITHIN THE MEANING OF SUBPARAGRAPH (A) (1), (2), (3) or (7) OF RULE 501 UNDER THE SECURITIES ACT THAT IS ACQUIRING THIS SECURITY FOR ITS OWN ACCOUNT, OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL “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 (F) PURSUANT TO ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO THE COMPANY’S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO IT IN ACCORDANCE WITH THE INDENTURE, A COPY OF WHICH MAY BE OBTAINED FROM THE COMPANY.

SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE WITH RESPECT TO SUCH PURCHASE OR HOLDING. ANY PURCHASER OR HOLDER OF THE SECURITIES 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.

THE HOLDER OF THIS SECURITY AGREES THAT IT WILL COMPLY WITH THE FOREGOING RESTRICTIONS

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 INDENTURE TO CONFIRM THAT THE TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS.

Plains Capital Corporation, a Texas corporation (the “Company” which term includes any successor Person under the Indenture hereinafter referred to), for value received promises to pay to U.S. Bank National Association, as successor in interest to State Street Bank and Trust Company of Connecticut, National Association, not in its individual capacity but solely as Institutional Trustee for PCC Statutory Trust I (the “Holder”) or registered assigns, the principal sum of eighteen million forty-two thousand dollars ($18,042,000.00) on July 31, 2031, and to pay interest on said principal sum from August 7, 2006, or from the most recent Interest Payment Date (as defined below) to which interest has been paid or duly provided for, quarterly (subject to deferral as set forth herein) in arrears on January 31, April 30, July 31 and October 31 of each year (each such date, an “Interest Payment Date”), commencing on the Interest Payment Date in October 2006, at an annual rate equal to (i) the rate determined under the Original Indenture for the period beginning on (and including) July 31, 2006 to (and excluding) August 7, 2006 (ii) 8.785% for the period beginning on (and including) August 7, 2006 and ending on (but excluding) the Interest Payment Date in October 2006, and (iii) the rate for each successive Distribution Period (defined below) equal to 3-Month LIBOR, determined as described below, plus 3.30% (the “Coupon Rate”); provided, however, that prior to the Interest Payment Date in July 2011, the Coupon Rate shall not exceed 12.50%, applied to the principal amount hereof, until the principal hereof is paid or

duly provided for or made available for payment, and on any overdue principal and (without duplication and to the extent that payment of such interest is enforceable under applicable law) on any overdue installment of interest (including Additional Interest) at the Interest Rate in effect for each applicable period, compounded quarterly, from the dates such amounts are due until they are paid or made available for payment. A “Distribution Period” is the period beginning on (and including) an Interest Payment Date and ending on (but excluding) the next succeeding Interest Payment Date. The amount of interest payable for any Distribution Period will be calculated by applying the Coupon Rate to the principal amount outstanding at the commencement of the Distribution Period and multiplying each such amount by the actual number of days in the Distribution Period concerned divided by 360. In the event that any date on which interest is payable on this Debenture is not a Business Day, then a payment of the interest payable on such date will be made on the next succeeding day which is a Business Day (and without any interest or other payment in respect of such delay), except that, if such Business Day is in the next succeeding calendar year, such payment will be made on the immediately preceding Business Day, in each case with the same force and effect as if made on the date the payment was originally payable. The interest installment so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the Indenture, be paid to the Person in whose name this Debenture (or one or more Predecessor Securities) is registered at the close of business on the regular record date for such interest installment, which shall be fifteen Business Days prior to the day on which the relevant Interest Payment Date occurs. Any such interest installment not so punctually paid or duly provided for shall forthwith cease to be payable to the Holder on such regular record date and may be paid to the Person in whose name this Debenture (or one or more Predecessor Securities) is registered at the close of business on a special record date. For purposes of clarification, the Interest Rate from the date of original issuance to (but excluding) August 7, 2006 (including the period from (and including) July 31, 2006 and ending on (but excluding) August 7, 2006) shall be as determined under the Original Indenture.

“3-Month LIBOR” as used herein, means, with respect to a Distribution Period, the London interbank offered interest rate for three-month U.S. dollar deposits determined by the Trustee in the following order of priority: (i) the rate (expressed as a percentage per annum) for U.S. dollar deposits having a three-month maturity that appears on Telerate Page 3750 as of 11:00 a.m. (London time) on the related Determination Date (“Telerate Page 3750” means the display designated as “Page 3750” on the Moneyline Telerate Service or such other page as may replace Page 3750 on that service or such other service or services as may be nominated by the British Bankers’ Association as the information vendor for the purpose of displaying London interbank offered rates for U.S. dollar deposits); (ii) if such rate cannot be identified on the related Determination Date, the Trustee will request the principal London offices of four leading banks in the London interbank market to provide such banks’ offered quotations (expressed as percentages per annum) to prime banks in the London interbank market for U.S. dollar deposits having a three-month maturity as of 11:00 a.m. (London time) on such Determination Date. If at least two quotations are provided, 3-Month LIBOR will be the arithmetic mean of such quotations; (iii) if fewer than two such quotations are provided as requested in clause (ii) above, the Trustee will request four major New York City banks to provide such banks’ offered quotations (expressed as percentages per annum) to leading European banks for loans in U.S. dollars as of 11:00 a.m. (London time) on such Determination Date. If at least two such quotations are provided, 3-Month LIBOR will be the arithmetic mean of such quotations; and (iv) if fewer than two such quotations are provided as requested in clause (iii) above, 3-Month LIBOR will be a 3-Month LIBOR determined with respect to the Distribution Period immediately preceding such current Distribution Period. If the rate for U.S. dollar deposits having a three-month maturity that initially appears on Telerate Page 3750 as of 11:00 a.m. (London time) on the related Determination Date is superseded on the Telerate Page 3750 by a corrected rate by 12:00 noon (London time) on such Determination Date, then the corrected rate as so substituted on the applicable page will be the applicable 3-Month LIBOR for such Determination Date. As used herein, “Determination Date” means the date that is two London Banking Days (i.e., a business day in which dealings in deposits in U.S. dollars are transacted in the London interbank market) preceding the commencement of the relevant Distribution Period.

The Interest Rate for any Distribution Period will at no time be higher than the maximum rate then permitted by New York law as the same may be modified by United States law.

All percentages resulting from any calculations on the Debentures will be rounded, if necessary, to the nearest one hundred-thousandth of a percentage point, with five one-millionths of a percentage point rounded upward (e.g., 9.876545% (or .09876545) being rounded to 9.87655% (or .0987655), and all dollar amounts used in or resulting from such calculation will be rounded to the nearest cent (with one-half cent being rounded upward)).

The principal of and interest on this Debenture shall be payable at the office or agency of the Trustee (or other paying agent appointed by the Company) maintained for that purpose in any coin or currency of the United States of America that at the time of payment is legal tender for payment of public and private debts; provided, however, that payment of interest may be made by check mailed to the registered holder at such address as shall appear in the Debenture Register if a request for a wire transfer by such holder has not been received by the Company or by wire transfer to an account appropriately designated by the holder hereof. Notwithstanding the foregoing, so long as the holder of this Debenture is the Institutional Trustee, the payment of the principal of and interest on this Debenture will be made in immediately available funds at such place and to such account as may be designated by the Trustee.

So long as no Acceleration Event of Default has occurred and is continuing, the Company shall have the right, from time to time, and without causing an Event of Default, to defer payments of interest on the Debentures by extending the interest payment period on the Debentures at any time and from time to time during the term of the Debentures, for up to 20 consecutive quarterly periods (each such extended interest payment period, an “Extension Period”), during which Extension Period no interest (including Additional Interest) shall be due and payable (except any Additional Sums that may be due and payable). No Extension Period may end on a date other than an Interest Payment Date. During an Extension Period, interest will continue to accrue on the Debentures, and interest on such accrued interest will accrue at an annual rate equal to the Interest Rate in effect for such Extension Period, compounded quarterly from the date such interest would have been payable were it not for the Extension Period, to the extent permitted by law (such interest referred to herein as “Additional Interest”). At the end of any such Extension Period the Company shall pay all interest then accrued and unpaid on the Debentures (together with Additional Interest thereon); provided, however, that no Extension Period may extend beyond the Maturity Date; provided further, however, that during any such Extension Period, the Company shall not and shall not permit any Affiliate to engage in any of the activities or transactions described on the reverse side hereof and in the Indenture. Prior to the termination of any Extension Period, the Company 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 accrued and unpaid interest and Additional Interest, the Company may commence a new Extension Period, subject to the foregoing requirements. No interest or Additional Interest shall be due and payable during an Extension Period, except at the end thereof, but each installment of interest that would otherwise have been due and payable during such Extension Period shall bear Additional Interest. The Company must give the Trustee notice of its election to begin or extend an Extension Period by the close of business at least 15 Business Days prior to the Interest Payment Date with respect to which interest on the Debentures would have been payable except for the election to begin or extend such Extension Period.

The indebtedness evidenced by this Debenture is, to the extent provided in the Indenture, subordinate and junior in right of payment to the prior payment in full of all Senior Indebtedness, and this Debenture is issued subject to the provisions of the Indenture with respect thereto. Each holder of this Debenture, by accepting the same, (a) agrees to and shall be bound by such provisions, (b) authorizes and directs the Trustee on his or her behalf to take such action as may be necessary or appropriate to acknowledge or effectuate the subordination so provided and (c) appoints the Trustee his or her attorney-in-fact for any and all such purposes. Each holder hereof, by his or her acceptance hereof, hereby waives all notice of the acceptance of the subordination provisions contained herein and in the Indenture by each holder of Senior Indebtedness, whether now outstanding or hereafter incurred, and waives reliance by each such holder upon said provisions.

This Debenture shall not be entitled to any benefit under the Indenture hereinafter referred to, be valid or become obligatory for any purpose until the certificate of authentication hereon shall have been signed by or on behalf of the Trustee.

The provisions of this Debenture are continued on the reverse side hereof and such provisions shall for all purposes have the same effect as though fully set forth at this place.


PLAINS CAPITAL CORPORATION

By
		Name:
		Title:


U.S. BANK NATIONAL ASSOCIATION, as Trustee

By:
		Authorized Officer

This Debenture is one of the floating rate junior subordinated deferrable interest debentures of the Company, all issued or to be issued under and pursuant to the Indenture dated as of July 31, 2001 (the “Original Indenture”), as amended and supplemented by that certain First Supplemental Indenture, dated as of August 7, 2006 (the Original Indenture, as so amended and supplemented, the “Indenture”), duly executed and delivered between the Company and the Trustee, to which Indenture reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Company and the holders of the Debentures. The Debentures are limited in aggregate principal amount as specified in the Indenture.

Upon the occurrence and continuation of a Special Event prior to the Interest Payment Date in July 2011, the Company shall have the right to redeem the Debentures in whole, but not in part, at any Interest Payment Date, within 120 days following the occurrence of such Special Event, at the Special Redemption Price.

In addition, the Company shall have the right to redeem the Debentures, in whole or in part, but in all cases in a principal amount with integral multiples of $1,000.00, on any Interest Payment Date on or after the Interest Payment Date in July 2011, at the Redemption Price.

Prior to 10:00 a.m. New York City time on the Redemption Date or Special Redemption Date, as applicable, the Company will deposit with the Trustee or with one or more paying agents an amount of money sufficient to redeem on the Redemption Date or the Special Redemption Date, as applicable, all the Debentures so called for redemption at the appropriate Redemption Price or Special Redemption Price.

If all, or less than all, the Debentures are to be redeemed, the Company will give the Trustee notice not less than 45 nor more than 60 days, respectively, prior to the Redemption Date or Special Redemption Date, as applicable, as to the aggregate principal amount of Debentures to be redeemed and the Trustee shall select, in such manner as in its sole discretion it shall deem appropriate and fair, the Debentures or portions thereof (in integral multiples of $1,000.00) to be redeemed.

Notwithstanding the foregoing, any redemption of Debentures by the Company shall be subject to the receipt of any and all required regulatory approvals.

In case an Acceleration Event of Default shall have occurred and be continuing, upon demand of the Trustee, the principal of all of the Debentures shall become due and payable in the manner, with the effect and subject to the conditions provided in the Indenture.

The Indenture contains provisions permitting the Company and the Trustee, with the consent of the holders of not less than a majority in aggregate principal amount of the Debentures at the time outstanding, to execute supplemental indentures for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of this Indenture or of any supplemental indenture or of modifying in any manner the rights of the holders of the Debentures; provided, however, that no such supplemental indenture shall without the consent of the holders of each Debenture then outstanding and affected thereby (i) change the fixed maturity of any Debenture, or reduce the principal amount thereof or any premium thereon, or reduce the rate or extend the time of payment of interest thereon, or reduce any amount payable on redemption thereof or make the principal thereof or any interest or premium thereon payable in any coin or currency other than that provided in the Debentures, or impair or affect the right of any Securityholder to institute suit for payment thereof or impair the right of repayment, if any, at the option of the holder, or (ii) reduce the aforesaid percentage of Debentures the holders of which are required to consent to any such supplemental indenture.

The Indenture also contains provisions permitting the holders of a majority in aggregate principal amount of the Debentures at the time outstanding on behalf of the holders of all of the Debentures to waive (or modify any previously granted waiver of) any past default or Event of Default, and its consequences, except a default (a) in the payment of principal of, premium, if any, or interest on any of the Debentures, (b) in respect of covenants or provisions hereof or of the Indenture which cannot be modified or amended without the consent of the holder of each Debenture affected, or (c) in respect of the covenants contained in Section 3.9 of the Indenture; provided, however, that if the Debentures are held by the Trust or a trustee of such trust, such waiver or modification to such waiver shall not be effective until the holders of a majority in Liquidation Amount of Trust Securities of the Trust shall have consented to such waiver or modification to such waiver, provided, further, that if the consent of the holder of each outstanding Debenture is required, such waiver shall not be effective until each holder of the Trust Securities of the Trust shall have consented to such waiver. Upon any such waiver, the default covered thereby shall be deemed to be cured for all purposes of the Indenture and the Company, the Trustee and the holders of the Debentures shall be restored to their former positions and rights hereunder, respectively; but no such waiver shall extend to any subsequent or other default or Event of Default or impair any right consequent thereon. Whenever any default or Event of Default hereunder shall have been waived as permitted by the Indenture, said default or Event of Default shall for all purposes of the Debentures and the Indenture be deemed to have been cured and to be not continuing.

No reference herein to the Indenture and no provision of this Debenture or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and premium, if any, and interest, including Additional Interest, on this Debenture at the time and place and at the rate and in the money herein prescribed.

The Company has agreed that if Debentures are initially issued to the Trust or a trustee of such Trust in connection with the issuance of Trust Securities by the Trust (regardless of whether Debentures continue to be held by such Trust) and (i) there shall have occurred and be continuing an Event of Default, (ii) the Company shall be in default with respect to its payment of any obligations under the Capital Securities Guarantee, or (iii) the Company shall have given notice of its election to defer payments of interest on the Debentures by extending the interest payment period as provided herein and such Extension Period, or any extension thereof, shall be continuing, then the Company shall not, and shall not allow any Affiliate of the Company to, (x) declare or pay any dividends or distributions on, or redeem, purchase, acquire, or make a liquidation payment with respect to, any of the Company’s capital stock or its Affiliates’ capital stock (other than payments of dividends or distributions to the Company or payments of dividends from direct or indirect subsidiaries of the Company to their parent corporations, which also shall be direct or indirect subsidiaries of the Company) or make any guarantee payments with respect to the foregoing or (y) make any payment of principal of or interest or premium, if any, on or repay, repurchase or redeem any debt securities of the Company or any Affiliate that rank pari passu in all respects with or junior in interest to the Debentures (other than, with respect to clauses (x) and (y) above, (1) repurchases, redemptions or other acquisitions of shares of capital stock of the Company in connection with any employment contract, benefit plan or other similar arrangement with or for the benefit of one or more employees, officers, directors or consultants, in connection with a dividend reinvestment or stockholder stock purchase plan or in connection with the issuance of capital stock of the Company (or securities convertible into or exercisable for such capital stock) as consideration in an acquisition transaction entered into prior to the applicable Extension Period, if any, (2) as a result of any exchange or conversion of any class or series of the Company’s capital stock (or any capital stock of a subsidiary of the Company) for any class or series of the Company’s capital stock or of any class or series of the Company’s indebtedness for any class or series of the Company’s capital stock, (3) the purchase of fractional interests in shares of the Company’s capital stock pursuant to the conversion or exchange provisions of such capital stock or the security being converted or exchanged, (4) any declaration of a dividend in connection with any stockholders’ rights plan, or the issuance of rights, stock or other

property under any stockholders’ rights plan, or the redemption or repurchase of rights pursuant thereto, (5) any dividend in the form of stock, warrants, options or other rights where the dividend stock or the stock issuable upon exercise of such warrants, options or other rights is the same stock as that on which the dividend is being paid or ranks pari passu with or junior to such stock and any cash payments in lieu of fractional shares issued in connection therewith, (6) payments of principal or interest on debt securities or payments of cash dividends or distributions on any capital stock issued by an Affiliate that is not, in whole or in part, a subsidiary of the Company (or any redemptions, repurchases or liquidation payments on such stock or securities), or (7) payments under the Capital Securities Guarantee).

The Debentures are issuable only in registered, certificated form without coupons and in minimum denominations of $100,000.00 and any multiple of $1,000.00 in excess thereof. As provided in the Indenture and subject to the transfer restrictions and limitations as may be contained herein and therein from time to time, this Debenture is transferable by the holder hereof on the Debenture Register of the Company. Upon due presentment for registration of transfer of any Debenture at the Principal Office of the Trustee or at any office or agency of the Company maintained for such purpose as provided in Section 3.2 of the Indenture, the Company shall execute, the Company or the Trustee shall register and the Trustee or the Authenticating Agent shall authenticate and make available for delivery in the name of the transferee or transferees a new Debenture for a like aggregate principal amount. All Debentures presented for registration of transfer or for exchange or payment shall (if so required by the Company or the Trustee or the Authenticating Agent) be duly endorsed by, or be accompanied by a written instrument or instruments of transfer in form satisfactory to, the Company and the Trustee or the Authenticating Agent duly executed by the holder or his attorney duly authorized in writing. No service charge shall be made for any exchange or registration of transfer of Debentures, but the Company or the Trustee may require payment of a sum sufficient to cover any tax, fee or other governmental charge that may be imposed in connection therewith.

Prior to due presentment for registration of transfer of any Debenture, the Company, the Trustee, any Authenticating Agent, any paying agent, any transfer agent and any Debenture registrar may deem the Person in whose name such Debenture shall be registered upon the Debenture Register to be, and may treat him as, the absolute owner of such Debenture (whether or not such Debenture shall be overdue) for the purpose of receiving payment of or on account of the principal of, premium, if any, and interest on such Debenture and for all other purposes; and neither the Company nor the Trustee nor any Authenticating Agent nor any paying agent nor any transfer agent nor any Debenture registrar shall be affected by any notice to the contrary. All such payments so made to any holder for the time being or upon his order shall be valid, and, to the extent of the sum or sums so paid, effectual to satisfy and discharge the liability for moneys payable upon any such Debenture.

No recourse for the payment of the principal of or premium, if any, or interest on any Debenture, or for any claim based thereon or otherwise in respect thereof, and no recourse under or upon any obligation, covenant or agreement of the Company in the Indenture or in any supplemental indenture, or in any such Debenture, or because of the creation of any indebtedness represented thereby, shall be had against any incorporator, stockholder, employee, officer or director, as such, past, present or future, of the Company or of any successor Person of the Company, either directly or through the Company or any successor Person of the Company, whether by virtue of any constitution, statute or rule of law, or by the enforcement of any assessment or penalty or otherwise, it being expressly understood that all such liability is hereby expressly waived and released as a condition of, and as a consideration for, the execution of the Indenture and the issue of the Debentures.

Capitalized terms used and not defined in this Debenture shall have the meanings assigned in the Indenture.

THE INDENTURE AND THE DEBENTURES SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO CONFLICT OF LAW PRINCIPLES THEREOF.