Main Street Investor Presentation

MAIN is a Principal Investor in Private Debt and Equity Hybrid debt and equity investment strategy, internally managed operating structure and focus on Lower Middle Market differentiates MAIN from other investment firms MAINST CAPITAL CORPORATION Internally-managed Business Development Company (BDC) IPO in 2007 $4.0 billion in capital under management(1) - $3.0 billion internally at MAIN(1) - $1.0 billion as a sub-adviser to a third party(1) Primarily invests in the under-served Lower Middle Market (LMM) Targets companies with revenue between $10 million - $150 million; EBITDA between $3 million - $20 million Provides single source solutions including a combination of first lien, senior secured debt and equity financing Debt investments in Middle Market companies Issuances of first lien, senior secured and/or rated debt investments Larger companies than LMM investment strategy Debt investments originated in collaboration with other funds First lien, senior secured debt investments in privately held companies originated through strategic relationships with other investment funds Similar in size, structure and terms to LMM and Middle Market investments Attractive asset management advisory business Significant management ownership/ investment in MAIN Headquartered in Houston, Texas (1) Capital under management includes undrawn portion of debt capital as of June 30, 2020 Main Street Capital Corporation NYSE: MAIN mainstcapital.com Page +

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