Main Street Investor Presentation

MAINST CAPITAL CORPORATION Asset Management Business MAIN's asset management business represents additional income diversification and the opportunity for greater shareholder returns MAIN's internally managed operating structure provides MAIN's shareholders the benefits of this asset management business In May 2012, MAIN(1) entered into an investment sub-advisory agreement with the investment adviser to HMS Income Fund, Inc. ("HMS"), a non-listed BDC MAIN(1) provides asset management services, including sourcing, diligence and post-investment monitoring MAIN(1) receives 50% of the investment adviser's base management fee and incentive fees -MAIN() base management fee-1% of total assets - MAIN incentive fees - 10% of net investment income above a hurdle and 10% of net realized capital gains Benefits to MAIN • No significant increases to MAIN's operating costs to provide services (utilize existing infrastructure and leverage fixed costs) No invested capital - monetizing the value of MAIN franchise Significant positive impact on MAIN's financial results - $2.2 million contribution to net investment income in the second quarter of 2020 $4.5 million contribution to net investment income in the six months ended June 30, 2020 (2) $11.7 million contribution to net investment income for the year ended December 31, 2019) $69.1 million of cumulative unrealized appreciation as of June 30, 2020 In June 2020, MAIN(1) entered into an asset purchase agreement with the investment adviser to HMS to become the sole investment adviser to HMS Transaction closing is subject to HMS shareholder approval and other customary closing conditions • MAIN(1) will receive 100% of the management fees following transaction close Base management fee to be reduced from 2.0% to 1.75% of total assets No change to incentive fee calculation (1) Through MAIN's wholly owned unconsolidated subsidiary, MSC Adviser, LLC (2) Contribution to Net Investment Income includes (a) dividend income received by MAIN from MSC Adviser I, LLC and (b) operating expenses allocated from MAIN to MSC Adviser I, LLC Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page 13

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