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Exhibit (k)(9)

EXCHANGE AGREEMENT

This EXCHANGE AGREEMENT (this “Agreement”) dated as of May 10, 2007, is by and among Main Street Capital Corporation, a Maryland corporation (“Parent”), and the undersigned members (the “GP Members”) of Main Street Mezzanine Management, LLC, a Delaware limited liability company (the “General Partner”).

Recitals:

WHEREAS, the GP Members are parties to that certain Third Amended and Restated Limited Liability Company Agreement of the General Partner, dated as of January 1, 2006 (the “GP LLC Agreement”): and

WHEREAS, the GP Members own 100% of the Interests (as defined in the GP LLC Agreement) of the General Partner (the “GP Interests”): and

WHEREAS, pursuant to the terms and conditions of this Agreement, Parent has proposed to issue shares of its common stock, par value $0.01 per share (the “Shares”), in exchange for all of the GP Interests (the “Exchange”); and

WHEREAS, the GP Members desire to exchange their GP Interests for the Shares pursuant to this Agreement; and

WHEREAS, it is contemplated that these transactions will close concurrently with the closing of the transactions contemplated by that certain Agreement and Plan of Merger (the “Merger Agreement”) by and among Parent, MSCC Merger Sub, LLC, a Delaware limited liability company (“Merger Sub”), and Main Street Mezzanine Fund, LP, a Delaware limited partnership (the “Fund”). pursuant to which (i) Merger Sub will merge with and into the Fund, with the Fund continuing as the surviving entity and as a subsidiary of Parent whose sole limited partner will be Parent and whose sole general partner will be the General Partner, and (ii) the limited partners of the Fund (the “Fund Limited Partners”) will receive common stock of Parent on the terms set forth therein (collectively, the “Merger”); and

WHEREAS, it is contemplated that these transactions will close concurrently with the closing of the transactions contemplated by that certain Exchange Agreement (the “LA Exchange Agreement”) by and among Parent and the members of Main Street Capital Partners, LLC, a Delaware limited liability company (the “Investment Advisor”), pursuant to which (i) Parent will acquire from the members of the Investment Advisor 100% of their equity interests in the Investment Advisor, and (ii) the members of the Investment Advisor will receive shares of common stock of Parent on the terms set forth therein (collectively, the “IA Exchange”); and

WHEREAS, it is contemplated that these transactions will close concurrently with the closing of the initial public offering of shares of common stock by Parent in a firm-commitment underwritten offering (the “Main Street IPO”); and

WHEREAS, it is contemplated that the issuance of common stock by Parent to the GP Members pursuant to this Agreement, to the Fund Limited Partners pursuant to the Merger Agreement and to the members of the Investment Advisor pursuant to the IA Exchange Agreement

will be exempt from registration pursuant to Section 4(2) of the Securities Act of 1933, as amended (the “Securities Act”) and/or Rule 506 thereunder;

NOW, THEREFORE, in consideration of the mutual covenants and undertakings set forth herein, and subject to and on the terms and conditions set forth herein, the parties hereby agree as follows:

ARTICLE I THE EXCHANGE

Section 1.1 The Exchange.

(a) At the Effective Time (as defined below), in accordance with this Agreement,

each GP Member agrees to exchange all of its GP Interests for such number of Shares equal to, on an

aggregate basis, (i) $9,000,000 (the “GP Valuation”) divided by (ii) the initial public offering price

per Share in the Main Street IPO (such Shares issuable to the GP Members in the Exchange, the

“Exchange Shares”), and Parent agrees to issue the Exchange Shares to the GP Members in exchange

for all of their GP Interests. The Exchange Shares will be allocated among the GP Members in

proportion to their respective Ownership Percentages (as defined in the GP LLC Agreement) in the

General Partner as of the Effective Time. As of the Effective Time, the GP Interests shall remain

issued and outstanding and owned by Parent.

(b) The number of Exchange Shares payable to any GP Member pursuant to the

formula set forth above will be rounded to the nearest whole number. At the Effective Time, Parent

will issue Exchange Shares to each GP Member in the amount determined in accordance with

Section 1.1 (a) above, subject to such GP Member’s execution and delivery of a Subscription

Agreement in the form attached hereto as Exhibit A.

ARTICLE II CLOSING

Section 2.1 Closing. The closing of the transactions contemplated hereby (the “Closing”) will take place at the offices of the parties, 1300 Post Oak Boulevard, Suite 800, Houston, Texas 77056, concurrently with the closing of the transactions contemplated by the Merger Agreement, the IA Exchange Agreement and the Main Street IPO, or at such other time and place as the parties mutually agree. For purposes of this Agreement, “Closing Date” means the date on which the Closing occurs. At the Closing, each GP Member will deliver to Parent a duly executed blank equity power and each GP Member’s spouse, if any, will deliver to Parent a duly executed Spousal Consent in the form attached hereto as Exhibit B (the “Spousal Consent”), and Parent will deliver to each GP Member the Exchange Shares to be issued to such GP Member pursuant to Section 1.1.

Section 2.2 Effective Time. Upon the terms and conditions of this Agreement, the Exchange will become effective at the date and time at which the Merger becomes effective is herein referred to as the “Effective Time.”

ARTICLE III REPRESENTATIONS AND WARRANTIES OF THE GP MEMBERS

Each GP Member represents and warrants to Parent, severally and not jointly, as follows: Section 3.1 Authority.

(a) Such GP Member has the legal capacity and requisite power and authority to

enter into and perform its obligations under this Agreement and the transactions contemplated

hereby. This Agreement has been duly executed and delivered by such GP Member. Assuming the

valid authorization, execution and delivery of this Agreement by each other party to this Agreement,

this Agreement and the transactions contemplated hereby are the valid and binding obligation of such

GP Member, enforceable against such GP Member in accordance with its terms, except as

enforceability may be limited by bankruptcy, insolvency, reorganization, moratorium, or the laws

relating to or affecting creditors rights generally or by equitable principles.

(b) As to such GP Member’s spouse, if any, (i) such spouse has the absolute and

unrestricted right, power and capacity to execute and deliver and to perform such spouse’s

obligations under the Spousal Consent being executed by such spouse and (ii) such Spousal Consent

constitutes the legal, valid and binding obligation of such spouse, enforceable against such spouse in

accordance with its terms, except as enforceability may be limited by bankruptcy, insolvency,

reorganization, moratorium, or the laws relating to or affecting creditors rights generally or by

equitable principles

Section 3.2 Ownership of GP Interests. Schedule 3.2 attached hereto accurately sets forth the class of Interests owned by such GP Member and the Ownership Percentage of such GP Member. Such GP Member has good and valid title to, and possesses full authority and legal right to sell, transfer and assign, its GP Interests, free of any liens, encumbrances or restrictions on transfer other than restrictions on transfer under applicable federal and state securities laws. There are no claims pending or, the knowledge of such GP Member, threatened against such GP Member that concern or affect title to its GP Interests.

Section 3.3 No Conflict. Neither the execution and delivery of this Agreement by such GP Member nor the consummation of the transactions contemplated hereby will, directly or indirectly (with or without notice or lapse of time): (i) conflict with any legal requirement or order of any court or governmental authority to which such GP Member is subject, or (ii) breach any provision of any contract to which such GP Member is a party. Except for any consents required to be obtained from the United States Small Business Administration (the “SBA”), such GP Member is not and will not be required to give any notice to or obtain any consent or approval from any person in connection with the execution and delivery of this Agreement or the consummation of the transactions under this Agreement.

Section 3.4 Legal Proceedings; Orders. There are no legal proceedings or actions pending or, to the knowledge of such GP Member, threatened against such GP Member that challenge, or that may have the effect of preventing, delaying, making illegal or otherwise interfering with, any of the transactions contemplated hereby. There are no orders pending or, to the knowledge of such GP Member, threatened against such GP Member that challenge, or that may have the effect of preventing, delaying, making illegal or otherwise interfering with, any of the transactions contemplated hereby.

ARTICLE IV REPRESENTATIONS AND WARRANTIES OF PARENT

Parent represents and warrants to each of the GP Members, as follows:

Section 4.1 Organization and Good Standing, Parent is a corporation duly incorporated, validly existing and in good standing under the laws of the State of Maryland, with full corporate power and authority to conduct its business as it is now being conducted.

Section 4.2 Authority. This Agreement constitutes the valid and binding obligation of Parent, enforceable against Parent in accordance with its terms. Parent has all requisite corporate power and authority to execute and deliver this Agreement and to consummate the transactions contemplated hereby. The execution and delivery of this Agreement by Parent and the consummation of the transactions contemplated hereby have been duly and validly authorized and approved by Parent.

Section 4.3 Valid Issuance of Exchange Shares. The Exchange Shares being issued hereunder have been duly and validly authorized, and will be duly and validly issued, fully paid and nonassessable after issuance and sale to the GP Members pursuant to this Agreement, and will be free of any liens, encumbrances or restrictions on transfer other than restrictions on transfer under applicable federal and state securities laws.

Section 4.4 No Conflict, Neither the execution and delivery of this Agreement by Parent nor the consummation of the transactions contemplated hereby will, directly or indirectly (with or without notice or lapse of time): (i) conflict with any legal requirement or order of any court or governmental authority to which Parent is subject, (ii) conflict with the Articles of Incorporation or Bylaws of Parent, or (iii) breach any provision of any contract to which Parent is a party. Except for any consents required to be obtained from the SBA, Parent is not and will not be required to give any notice to or obtain any consent or approval from any person in connection with the execution and delivery of this Agreement or the consummation of the transactions under this Agreement.

Section 4.5 Legal Proceedings; Orders. There are no legal proceedings or actions pending or, to the knowledge of Parent, threatened against Parent that challenge, or that may have the effect of preventing, delaying, making illegal or otherwise interfering with, any of the transactions contemplated hereby. There are no orders pending or, to the knowledge of Parent, threatened against Parent that challenge, or that may have the effect of preventing, delaying, making illegal or otherwise interfering with, any of the transactions contemplated hereby.

ARTICLE V CONDITIONS TO CLOSING

Section 5.1 Mutual Conditions. The obligations of each party to consummate the transactions contemplated by this Agreement are subject to the satisfaction at or prior to the Closing of each of the following conditions (any of which may be waived in writing, in whole or in part, by such party):

(a) Closing of Merger. The Merger must close concurrently with the closing of the transactions contemplated hereby.

(b) Closing of IA Exchange. The IA Exchange must close concurrently with the
closing of the transactions contemplated hereby.

with the closing of the transactions contemplated hereby,

(d) Approval of SBA. The SBA must have consented to the transactions

contemplated by, and related to, this Agreement, the Merger Agreement, the IA Exchange

Agreement and the Main Street IPO.

Section 5.2 Conditions to Obligations of the GP Members. The obligations of the GP Members to consummate the transactions contemplated by this Agreement are subject to the satisfaction at or prior to the Closing of the following condition (which may be waived in writing, in whole or in part, by the GP Members holding at least fifty percent (50%) of the GP Interests):

(a) Representations and Warranties. The representations and warranties of Parent in Article IV must be true and correct in all material respects as of the Closing.

Section 5.3 Conditions to Obligations of Parent. The obligations of Parent to consummate the transactions contemplated by this Agreement are subject to the satisfaction at or prior to the Closing of the following condition (which may be waived in writing, in whole or in part, by Parent):

(a) Representations and Warranties. The representations and warranties of each of the GP Members in Article HI must be true and correct in all material respects as of the Closing.

ARTICLE VI REGISTRATION COVENANT

Section 6.1 Registration.

(a) Reasonable Best Efforts to Register. Following the first anniversary of the

Closing, Parent shall use its reasonable best efforts to file a registration statement with respect to the

resale of all of the Exchange Shares, and to cause such registration statement to become effective, as

soon as practicable following such first anniversary (the Exchange Shares to be registered, the

“Registered Shares”); provided, however, that Parent will not be obligated to effect any such

registration for such period of time, as, in the good faith judgment of the Board of Directors of

Parent, such registration would be seriously detrimental to Parent and the Board of Directors of

Parent concludes, as a result, that it is essential to defer the filing of such registration statement until

such time as such registration would not be detrimental. In addition, Parent will use reasonable best

efforts to cause the Exchange Shares to be listed on the Nasdaq Global Market or other securities

exchange on which Parent’s common stock is then listed at such time that the resale of the Exchange

Shares is registered.

(b) Expenses. All Registration Expenses (as defined below) incurred in

connection with any registration pursuant to Section 6.1 (a) above will be borne by the Parent. Any

Selling Expenses (as defined below) relating to the Registered Shares will be borne by the holders of

such securities pro rata on the basis of the number of shares of securities so registered on their behalf.

For purposes of this Agreement, (i) “Registration Expenses” means all expenses incurred in effecting

any registration pursuant to Section 6.1 (a) above, including, without limitation, all registration, qualification, and filing fees, printing expenses, escrow fees, fees and disbursements of counsel for Parent, blue sky fees and expenses, expenses of any regular or special audits incident to or required by any such registration and reasonable fees and disbursements of one counsel for the GP Members as selling stockholders, but will not include (x) Selling Expenses and (y) the compensation of regular employees of the Parent, which will be paid in any event by the Parent, and (ii) “Selling Expenses” means any underwriting discounts, selling commissions and stock transfer taxes applicable to the sale of the Registered Shares and fees and disbursements of counsel for any GP Member (other than the fees and disbursements of one counsel for the GP Members included in Registration Expenses as set forth above).

ARTICLE VII GENERAL PROVISIONS

Section 7.1 Survival None of the representations and warranties, and no covenant to be performed prior to the Effective Time, set forth herein, shall survive the Effective Time.

Section 7.2 Termination. By written notice, this Agreement may be terminated by either the GP Members holding at least fifty percent (50%) of the GP Interests, on the one hand, or Parent, on the other hand, if the Closing has not occurred on or before December 31, 2007.

Section 7.3 Waiver. No failure to exercise, and no delay in exercising, on the part of any party, any privilege, any power or any right hereunder will operate as a waiver thereof, nor will any single or partial exercise of any privilege, right or power hereunder preclude further exercise of any other privilege, right or power hereunder.

Section 7.4 Entire Agreement and Modification. This Agreement constitutes the entire agreement between the parties with respect to the subject matter of this agreement and supersedes all prior agreements between the parties with respect to its subject matter. This Agreement may not be amended except by a written agreement signed by the party to be charged with the amendment. This Agreement shall be amended by the parties if requested by the SBA to comply with SBA regulations, provided that no such amendment will change the total amount or allocation of the GP Valuation.

Section 7.5 Assignment; Binding Effect; No Third Party Beneflciaries. This Agreement may not be assigned by any party without the prior written consent of the other parties. Subject to the foregoing, this Agreement will be binding upon and shall inure to the benefit of the parties hereto and their permitted successors and assigns. Nothing in this Agreement will be construed to give any person other than the parties to this Agreement any legal or equitable right under or with respect to this Agreement, except such rights as will inure to a successor or permitted assignee pursuant to this Section 7.5.

Section 7.6 Severability. If any provision of this Agreement is held invalid or unenforceable by any court of competent jurisdiction, the other provisions of this Agreement will remain in full force and effect.

Section 7.7 Governing Law. This Agreement will be governed by and construed in accordance with the laws of the State of Delaware, without regard to the conflict of law provisions thereof.

Section 7.8 Construction. The language used in the Agreement will be construed, in all cases, according to its fair meaning, and not for or against any party hereto. The parties acknowledge that each party has reviewed this Agreement and that rules of construction to the effect that any ambiguities are to be resolved against the drafting party will not be available in the interpretation of this Agreement.

Section 7.9 Execution of Agreement; Counterparts. This Agreement may be executed in one or more counterparts, each of which will be deemed to be an original copy of this Agreement and all of which, when taken together, will be deemed to constitute one and the same agreement.

Section 7.10 Notices. All notices, consents, waivers, and other communications under this Agreement must be in writing and must be delivered (i) personally, (ii) by facsimile with confirmation of transmission by the transmitting equipment, or (iii) by certified or registered mail (postage prepaid, return receipt requested), and will be deemed given when so delivered personally or by facsimile, or if mailed, three (3) days after the date of mailing, to the addresses and facsimile numbers set forth below (or to such other addresses and facsimile numbers as a party may designate by notice to the other parties):

If to Parent:

Main Street Capital Corporation 1300 Post Oak Boulevard, Suite 800 Houston, Texas 77056 Attn: Chief Executive Officer Facsimile: (713) 350-6042

If to a GP Member:

the GP Member
1300 Post Oak Boulevard, Suite 800 Houston, Texas 77056 Facsimile: (713) 350-6042

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Exhibit B Spousal Consent

The undersigned spouse of Vincent Foster , a party to the Exchange

Agreement dated as of May 10, 2007 (the “Exchange Agreement”), by and among Main Street Capital Corporation, a Maryland corporation (“Parent”), and the members of Main Street Mezzanine Management, LLC, a Delaware limited liability company, acknowledges on his or her own behalf that:

I have read the Exchange Agreement and I know its contents. I am aware that by its

provisions my husband or wife, Vincent Foster, sells to Parent all of his or her
right, title and interest in the GP Interests (as defined in the Exchange Agreement), including my community interest (if any) in it (the “Property”). I hereby consent to the sale, approve of the provisions of the Exchange Agreement, and agree that such Property and my interest in it (if any) are subject to the provisions of the Exchange Agreement and that I will take no action at any time to hinder the operation of the Exchange Agreement or such Property or my interest in it (if any).

Thus done and signed on the 10^th day of May, 2007.

Signature: Margaret L. Foster
Print name: Margaret L. Foster

Exhibit B Spousal Consent

The undersigned spouse of TODD REPPERT , a party to the Exchange

I have read the Exchange Agreement and I know its contents. I am aware that by its provisions my husband or wife, Todd Reppert sells to Parent all of his or her right, title and interest in the GP Interests (as defined in the Exchange Agreement), including my community interest (if any) in it (the “Property”). I hereby consent to the sale, approve of the provisions of the Exchange Agreement, and agree that such Property and my interest in it (if any) are subject to the provisions of the Exchange Agreement and that I will take no action at any time to hinder the operation of the Exchange Agreement or such Property or my interest in it (if any),

Thus done and signed on the 10^th day of May, 2007.

Signature: Anna Reppert

Print name: ANNA REPPERT

Exhibit B Spousal Consent

The undersigned spouse of David Magdoc , a party to the Exchange Agreement dated as of May 10, 2007 (the “Exchange Agreement”), by and among Main Street Capital Corporation, a Maryland corporation (“Parent”), and the members of Main Street Mezzanine Management, LLC, a Delaware limited liability company, acknowledges on his or her own behalf that:

I have read the Exchange^Agreement and I know its contents. I am aware that by its provisions my husband or wife, David magdoc , sells to Parent all of his or her right, title and interest in the GP Interests (as defined in the Exchange Agreement), including my community interest (if any) in it (the “Property”). I hereby consent to the sale, approve of the provisions of the Exchange Agreement, and agree that such Property and my interest in it (if any) are subject to the provisions of the Exchange Agreement and that I will take no action at any time to hinder the operation of the Exchange Agreement or such Property or my interest in it (if any).

Thus done and signed on the 10^th day of May, 2007.

Signature : Danielle Magdoc

Print name: DANIELLE MAGDOC

Exhibit B Spousal Consent

The undersigned spouse of Curtis L. Hartman a party to the Exchange Agreement dated as of May 10, 2007 (the “Exchange Agreement”), by and among Main Street Capital Corporation, a Maryland corporation (“Parent”), and the members of Main Street Mezzanine Management, LLC, a Delaware limited liability company, acknowledges on his or her own behalf that:

I have read the Exchange Agreement and I know its contents. I am aware that by its provisions my husband or wife, Curtis L. Hartman sells to Parent all of his or her right, title and interest in the GP Interests (as defined in the Exchange Agreement), including my community interest (if any) in it (the “Property”). I hereby consent to the sale, approve of the provisions of the Exchange Agreement, and agree that such Property and my interest in it (if any) are subject to the provisions of the Exchange Agreement and that I will take no action at any time to hinder the operation of the Exchange Agreement or such Property or my interest in it (if any).

Thus done and signed on the 10^th day of May, 2007.

Signature : Amy Hartman

Print name: AMY HARTMAN

Exhibit B Spousal Consent

The undersigned spouse of Dwayne Hyzak a party to the Exchange

I have read the Exchange Agreement and I know its contents. I am aware that by its provisions my husband or wife, Dwayne Hyzak , sells to Parent all of his or her right, title and interest in the GP Interests (as defined in the Exchange Agreement), including my community interest (if any) in it (the “Property”). I hereby consent to the sale, approve of the provisions of the Exchange Agreement, and agree that such Property and my interest in it (if any) are subject to the provisions of the Exchange Agreement and that I will take no action at any time to hinder the operation of the Exchange Agreement or such Property or my interest in it (if any).

Thus done and signed on the 10^th day of May, 2007.

Signature: Kristi Hyzak

Print name: KRISTI HYZAK