MSC Adviser I, LLC, a Delaware limited liability company (“MSC Adviser”), is an investment advisory firm formed in November 2013. MSC Adviser is wholly owned by Main Street Capital Corporation, a Maryland corporation (“MSCC”, and collectively with its consolidated subsidiaries and MSC Adviser, “Main Street”) that is publicly traded (NYSE: MAIN). MSCC is an internally managed non-diversified closed-end investment company that was formed in 2007 and has elected to be regulated as a business development company (“BDC”) under the Investment Company Act of 1940, as amended (the “1940 Act”). MSC Adviser was formed to provide investment management and other services related to MSCC’s external asset management business (i.e., to persons other than MSCC and its subsidiaries), and MSCC was granted no- action relief by the SEC to allow MSC Adviser to be a registered investment adviser. Main Street is headquartered in Houston, Texas. Main Street Main Street is a principal investment firm primarily focused on providing customized debt and equity financing to lower middle market (“LMM”) companies and debt capital to middle market (“Middle Market”) companies. Main Street’s portfolio investments are typically made to support management buyouts, recapitalizations, growth financings, refinancings and acquisitions of companies that operate in a variety of industry sectors. Main Street seeks to partner with entrepreneurs, business owners and management teams, and generally provides “one stop” financing alternatives within its LMM investment strategy. Main Street invests primarily in secured debt investments, equity investments, warrants and other securities of LMM companies based in the United States and in secured debt investments of Middle Market companies generally headquartered in the United States. Main Street acquires securities through its LMM, Private Loan, and Middle Market investment strategies. Main Street’s LMM investment strategy involves investments in companies that generally have annual revenues between $10 million and $150 million, and its LMM portfolio investments generally range in size from $5 million to $75 million. Main Street’s private loan (“Private Loan”) investment strategy involves investments in companies that are consistent with the size of the companies in its LMM and Middle Market investment strategies, and its Private Loan investments generally range in size from $10 million to $75 million. Main Street’s Middle Market investment strategy involves investments in companies that are generally larger in size than its LMM companies, with annual revenues typically between $150 million and $1.5 billion, and its Middle Market investments generally range in size from $3 million to $25 million. Main Street’s investments also include other portfolio investments (“Other Portfolio”) primarily consisting of investments managed by third parties. Main Street seeks to fill the financing gap for LMM businesses that have historically had limited access to financing from commercial banks and other traditional sources. The underserved nature of the LMM creates the opportunity for Main Street to meet the financing needs of LMM companies while also negotiating favorable transaction terms and equity participation. Main Street’s ability to invest across a company’s capital structure, from secured loans to equity securities, allows it to offer portfolio companies a comprehensive suite of financing options, or a “one stop” financing solution. Providing customized, “one stop” financing solutions is important to LMM portfolio companies. Main Street generally seeks to partner directly with entrepreneurs, management teams and business owners in making its LMM investments. Main Street’s LMM portfolio debt investments are generally secured by a first lien on the assets of the portfolio company and typically have a term of between five and seven years from the original investment date. 5 | P a g e Private Loan investments primarily consist of debt securities that have primarily been originated directly by Main Street or, to a lesser extent, by Main Street through strategic relationships with other investment funds on a collaborative basis through investments that are often referred to in the debt markets as “club deals” because of the small lender group size. Main Street’s Private Loan investments are typically made to support a company owned by or in the process of being acquired by a private equity sponsor. Private Loan investments are typically similar in size, structure, terms and conditions to investments

Main Street holds in its LMM portfolio and Middle Market portfolio. Main Street’s Private Loan portfolio debt investments are generally secured by a first priority lien on the assets of the portfolio company and typically have a term of between three and seven years from the original investment date. Main Street may also co-invest with the private equity sponsors in the equity securities of its Private Loan portfolio companies. Main Street’s Middle Market portfolio investments primarily consist of direct investments in or secondary purchases of debt securities acquired through a syndicated process in privately held companies based in the United States that are generally larger in size than the companies included in its LMM portfolio. Main Street’s Middle Market portfolio debt investments are generally secured by a first priority lien on the assets of the portfolio company and typically have an expected duration of between three and seven years from the original investment date. Main Street’s Other Portfolio investments primarily consist of investments that are not consistent with the typical profiles for its LMM, Private Loan or Middle Market portfolio investments, including investments which may be managed by third parties. In its Other Portfolio, Main Street may incur indirect fees and expenses in connection with investments managed by third parties, such as investments in other investment companies or private funds. MSCC wholly owns several investment funds, including Main Street Mezzanine Fund, LP (“MSMF”) and Main Street Capital III, LP (“MSC III” and, together with MSMF, the “MSCC Funds”), and each of their general partners. Each of the MSCC Funds is licensed as a Small Business Investment Company (“SBIC”) by the United States Small Business Administration (“SBA”). MSC Adviser MSC Adviser currently provides discretionary investment advisory and management services to BDCs, Private Funds and other institutional clients (including through separately managed accounts) that primarily make investments similar to those made by Main Street, including MSC Income Fund, Inc., a Maryland Corporation (“MSIF”), a public non-traded BDC. MSIF MSIF is an externally managed, non-diversified closed-end investment company that has elected to be regulated as a BDC under the 1940 Act. MSIF seeks to generate current income through debt and equity investments, and secondarily, to generate long-term capital appreciation through such equity and equity-related investments. MSIF’s strategy is to invest primarily in illiquid debt and equity securities through the Private Loan, LMM and Middle Market investment strategies. MSIF’s Private Loan, LMM and Middle Market portfolio investments generally range in size from $1 million to $20 million. Typically, MSIF’s investments are made as co-investments with Main Street. MSIF’s portfolio also includes Other Portfolio investments. Please see Items 6, 10 and 11 of this Brochure for a further discussion of potential conflicts of interest and Main Street’s management thereof. 6 | P a g e Except as otherwise described herein, Client assets are managed in accordance with the investment guidelines and constraints based upon the investment objectives and limitations of that Client as stated in its organizational and offering documents. MSC Adviser does not generally tailor its investment management services to the individualized needs of any Client’s investors. To the extent permitted under the Client’s governing documents and in accordance with applicable law and regulation, MSC Adviser or an affiliate may, in the future, enter into side letters or other similar agreements with certain investors in a Client granting such investors terms and conditions that are more favorable than other investors in such Client, including lower fees. For a detailed discussion of side letters and other terms, investors should refer to the applicable Client’s Client Documents. However, recent SEC regulations will generally require that when MSC Adviser negotiates fees, or offers fee waivers, expense caps or similar arrangements to an investor in a Client after March 2025, it must inform other investors in such Client. However, MSC Adviser may not be similarly obligated to inform, or offer similar arrangements to, other Clients or investors in those Clients. As of December 31, 2023, MSC Adviser had discretionary regulatory assets under management of approximately $1,450.6 million and approximately $98.4 million of non-discretionary assets under management.