# main-street-capital-main > Analysis by Optimly for Optimly AI Visibility, in the Optimly AI Brand Index. Last analyzed September 12, 2026. > Main Street Capital is a principal investment firm based in Houston, Texas, that provides long-term debt and equity capital solutions to lower middle market companies and debt capital to private companies owned by or in the process of being acquired by private equity funds. They target companies with annual revenues between $10 million and $500 million. - Business Profile: https://optimly.ai/brand/main-street-capital-main - Publisher: Optimly (https://optimly.ai) - Dataset: Optimly AI Brand Index (https://optimly.ai/brand) - Official website: https://mainstcapital.com/ - Logo: https://logo.clearbit.com/mainstcapital.com - Slug: main-street-capital-main - Brand Authority Index tier: Emerging - Category: Private Debt Providers - Last Analyzed: September 12, 2026