Main Street Capital Investor Day Presentation Deck

Financial Overview | Financial Snapshot 100.0% 46.2% growth since Transaction Date 123.4% II Transaction Date Revenue Growth (1) 2019 142.4% 2020 122.8% 2021 135.0% Organic Acquisitions Proforma Centre 2022 (1) Periods ended as of 12/31 except for TTM March; Proforma for 2022 acquisitions 146.2% TTM Mar-23 100.0% Transaction Date Adjusted EBITDA Growth (1) 69.3% growth since Transaction Date 133.9% 2019 Organic 123.0% 2020 112.7% 2021 156.3% Acquisitions Proforma Centre Centre TECHNOLOGIES 2022 I 169.3% TTM Mar-23

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