Main Street Capital (MAIN) investor relations material

Executive summary

• The 2026 Annual Meeting will be held on May 4, 2026, with voting on director elections, auditor ratification, and an advisory say-on-pay vote.

• Shareholders of record as of March 3, 2026, are entitled to vote, with multiple voting methods available including mail, phone, and internet.

• Proxy materials and the annual report are available online, and the company encourages electronic delivery to reduce costs.

Voting matters and shareholder proposals

• Shareholders will vote on: (1) election of seven directors for a one-year term, (2) ratification of Grant Thornton LLP as independent auditor for 2026, and (3) advisory approval of executive compensation.

• All directors are standing for re-election; majority of votes cast is required for election.

• Shareholder proposals for the 2027 meeting must be submitted by November 23, 2026, following specific bylaw requirements.

Board of directors and corporate governance

• The board consists of seven members, five of whom are independent; all committees are composed entirely of independent directors.

• Board leadership includes a non-executive chairman and a lead independent director; regular executive sessions are held.

• Annual board and committee self-assessments are conducted, and stock ownership guidelines apply to directors and key employees.

• The Nominating and Corporate Governance Committee oversees ESG activities and board succession planning.