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Exhibit 5.1
October 29, 2026
Main Street Capital Corporation 1300 Post Oak Boulevard, Suite 800 Houston, TX 77056 |
Ladies and Gentlemen:
We have acted as counsel to Main Street Capital Corporation, a Maryland corporation
(the “Company”), in connection with the preparation and filing of a registration statement on
Form N-2 (File No. 333-285405) (as amended as of the date hereof, the “Registration
Statement”) filed by the Company with the U.S. Securities and Exchange Commission (the
“Commission”) under the Securities Act of 1933, as amended (the “Securities Act”), which
became effective immediately upon its filing on February 28, 2025, and the final prospectus
supplement, dated October 27, 2026 (including the base prospectus filed therewith, the
“Prospectus”), filed with the Commission on October 28, 2026 pursuant to Rule 424 under the
Securities Act, relating to the proposed issuance by the Company of $500,000,000 aggregate
principal amount of 6.550% notes due 2030 (the “Notes”), to be sold to underwriters pursuant to
an underwriting agreement, dated as of October 27, 2026, which is substantially in the form filed
as Exhibit 1.1 to the Company’s Current Report on Form 8-K filed with the Commission on
October 29, 2026 (the “Underwriting Agreement”). All of the Notes are to be sold by the
Company as described in the Registration Statement and related Prospectus. This opinion letter is
being furnished to the Company in accordance with the requirements of Item 25 of Form N-2
under the Securities Act, and we express no opinion herein as to any matter other than as to the
legality of the Notes.
The Notes will be issued pursuant to the indenture, incorporated by reference as an exhibit
to the Registration Statement, entered into between the Company and The Bank of New York
Mellon Trust Company, N.A., as trustee (the “Trustee”), on April 2, 2013, as supplemented by a
ninth supplemental indenture, filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K
filed with the Commission on October 29, 2026 (collectively, the “Indenture”).
As counsel to the Company, we have participated in the preparation of the Registration Statement
and the Prospectus and have examined the originals or copies of the following:
Main Street Capital Corporation
October 29, 2026
Page 2
(i)The Articles of Amendment and Restatement of the Company, certified as of the date
hereof by an officer of the Company;
(ii)The Amended and Restated Bylaws of the Company, certified as of the date hereof by an
officer of the Company;
(iii)A Certificate of Good Standing with respect to the Company issued by the State
Department of Assessments and Taxation of the State of Maryland as of a recent date;
(iv)The resolutions of the board of directors of the Company, or a duly authorized committee
thereof, relating to, among other things, (a) the authorization and approval of the
preparation and filing of the Registration Statement, (b) the authorization, execution and
delivery of the Indenture; and (c) the authorization, issuance and sale of the Notes,
certified as of the date hereof by an officer of the Company;
(v)The Underwriting Agreement;
(vi)The Indenture; and
(vii)A specimen copy of the form of the Notes to be issued pursuant to the Indenture
in the form attached to the Indenture.
With respect to such examination and our opinion expressed herein, we have assumed,
without any independent investigation or verification, (i) the genuineness of all signatures of
persons signing all documents submitted to us for examination in connection with which this
opinion is rendered, (ii) the legal capacity of all natural persons, (iii) the authenticity of all
documents submitted to us as originals, (iv) the conformity to original documents of all
documents submitted to us as conformed or reproduced copies and the authenticity of the
originals of such copied documents, (v) the legal power and authority of all persons signing on
behalf of the parties to all such documents (other than the Company), (vi) the due authorization,
execution and delivery of all documents by the parties thereto (other than the Company), (vii) that
all certificates issued by public officials have been properly issued, (viii) that the Indenture will
be a valid and legally binding obligation of the parties thereto (other than the Company), (ix) the
accuracy and completeness of all corporate records made available to us by the Company, and (x)
that at the time of issuance of the Notes, after giving effect to such issuance, the Company will be
in compliance with Section 18(a)(1)(A) of the Investment Company Act of 1940, as amended (the
“1940 Act”), giving effect to Section 61(a) of the 1940 Act.
Main Street Capital Corporation
October 29, 2026
Page 3
As to certain matters of fact relevant to the opinions in this opinion letter, we have relied
upon certificates and/or representations of officers of the Company. We have also relied on
certificates and confirmations of public officials. We have not independently established the facts,
or in the case of certificates or confirmations of public officials, the other statements, so relied
upon.
This opinion letter is limited to the contract laws of the State of New York, and, to the
extent relevant to the opinion expressed herein, the applicable provisions of the Maryland General
Corporation Law, in each case as in effect on the date hereof, and we express no opinion with
respect to any other laws of such jurisdictions or the laws of any other jurisdictions. Without
limiting the preceding sentence, we express no opinion with respect to the “blue sky” or other
securities laws or regulations of the State of Maryland or any other jurisdiction or as to any state
securities or broker dealer laws or regulations thereunder relating to the offer, issuance and sale of
the Notes. This opinion letter has been prepared, and should be interpreted, in accordance with
customary practice followed in the preparation of opinion letters by lawyers who regularly give,
and such customary practice followed by lawyers who on behalf of their clients regularly advise
opinion recipients regarding, opinion letters of this kind.
Based upon and subject to the limitations, exceptions, qualifications and assumptions set
forth in this opinion letter, we are of the opinion that, when the Notes are duly executed and
delivered by duly authorized officers of the Company and duly authenticated by the Trustee, all in
accordance with the provisions of the Indenture, and delivered to the underwriters against
payment therefor in accordance with the terms of the Underwriting Agreement, the Notes will
constitute valid and legally binding obligations of the Company, enforceable against the
Company in accordance with their terms, except as such enforceability may be limited by
applicable bankruptcy, insolvency, reorganization, receivership, moratorium, fraudulent
conveyance, and other similar laws affecting the rights and remedies of creditors generally and by
general principles of equity (including without limitation the availability of specific performance
or injunctive relief and the application of concepts of materiality, reasonableness, good faith and
fair dealing), regardless of whether considered in a proceeding at law or in equity.
The opinions expressed in this opinion letter (a) are strictly limited to the matters stated in
this opinion letter, and without limiting the foregoing, no other opinions are to be implied and (b)
are only as of the date of this opinion letter, and we are under no obligation, and do not undertake,
to advise the Company or any other person or entity either of any change of law or fact that
occurs, or of any fact that comes to our attention, after the date of this opinion letter, even though
such change or such fact may affect the legal analysis or a legal conclusion in this opinion letter.
Main Street Capital Corporation
October 29, 2026
Page 4
We hereby consent to the filing of this opinion as an exhibit to the Company’s Current
Report on Form 8-K filed with the Commission on October 29, 2026 and to the reference to our
firm in the “Legal Matters” section in the Prospectus. We do not admit by giving this consent that
we are in the category of persons whose consent is required under Section 7 of the Securities Act
or the rules and regulations of the Commission thereunder.
Very truly yours,
/s/ Dechert LLP