MAIN vs AMG Comparison

Main Street Capital Corp is an investment firm engaged in providing customized debt and equity financing to lower middle market companies and debt capital to middle market companies. The investment portfolio of the company is typically made to support management buyouts, recapitalizations, growth financings, refinancing, and acquisitions of companies that operate in diverse industry sectors. The group invests in secured debt investments, equity investments, warrants, and other securities of the lower middle market and middle market companies based in the United States. Business functioned through the U.S. region and it derives the majority of its income from the source of fees, commission, and interest.

Affiliated Managers Group offers investment strategies to investors through its network of affiliates. The firm typically buys a majority interest in small to mid-size boutique asset managers, receiving a fixed percentage of revenue from these firms in return. Affiliates operate independently, with AMG providing strategic, operational, and technology support, as well as global distribution. At the end of June 2025, AMG's affiliate network—which includes firms like Abacus Capital and Pantheon dedicated to private markets (which accounted for 19% of AUM), AQR Capital and Capula Investment Management in liquid alternatives (24%), and Harding Loevner, Tweedy Browne, Parnassus, and Yacktman in equities, multi-asset, and bond strategies (57%)—had $771 billion in managed assets.