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NYSE: MAIN Main Street Capital CORP 8-K

Main Street Capital rotates ATM sales agents, maintains 20M share capacity

Filed August 12, 2026 · Period ending August 11, 2026 · ~1 min read

2 key changes 1 section

Key Changes

  • medium

    Added Academy Securities and SMBC Nikko Securities America as sales agents under existing at-the-market equity program with capacity to sell up to 20M shares.

  • low

    Terminated equity distribution agreement with B. Riley Securities effective August 11, 2026, removing them as a sales agent.

Summary

Main Street Capital filed a routine update to its at-the-market equity offering program, adding two new sales agents (Academy Securities and SMBC Nikko Securities America) while terminating its agreement with B. Riley Securities. The changes represent a rotation of intermediaries rather than a modification to the program's structure or capacity.

The ATM program continues to authorize sales of up to 20 million shares of common stock, with Main Street retaining full discretion over whether, when, and how much to sell. The company has no obligation to issue shares under the program. For a business development company like Main Street that periodically raises equity capital to fund investments, maintaining multiple sales agent relationships provides flexibility in accessing the equity markets, but this administrative update carries no immediate capital-raising implications.

Section-by-Section Diff

Event · Item 1.01 — Entry into a Material Definitive Agreement

~500 words

Main Street Capital added two sales agents to its ATM program and terminated one, maintaining ability to sell up to 20M shares.

3 Added
Added ATM program capacity medium

Added in current filing · verify on EDGAR →

Under the Equity Distribution Agreements, Main Street may, but has no obligation to, issue and sell up to 20,000,000 shares of its common stock, par value $0.01 per share (the “Shares”), from time to time through the Sales Agents, or to them, as principal for their own account.

The filing confirms the ATM program maintains capacity to sell up to 20 million shares of common stock. Main Street has no obligation to sell shares and retains full discretion over timing and amounts of any sales through the sales agents.

Show 2 minor / wording changes
Added ATM program sales agent additions low

Added in current filing · verify on EDGAR →

On August 11, 2026, Main Street Capital Corporation (“Main Street”) entered into separate equity distribution agreements (each, a “New Equity Distribution Agreement”) with each of Academy Securities, Inc. (“Academy”) and SMBC Nikko Securities America, Inc. (“SMBC Nikko”)

Main Street added Academy Securities and SMBC Nikko Securities America as new sales agents under its existing at-the-market equity offering program. These agents can facilitate sales of common stock under the same terms as the existing sales agents.

Added ATM program sales agent termination low

Added in current filing · verify on EDGAR →

Additionally, effective August 11, 2026, Main Street and B. Riley Securities, Inc. (“B. Riley”) agreed to terminate the equity distribution agreement, dated March 4, 2025, between Main Street and B. Riley.

Main Street terminated its equity distribution agreement with B. Riley Securities, removing them as a sales agent from the ATM program. This appears to be a routine rotation of sales agents with no disclosed impact on the program's terms or capacity.

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Figures/quotes linked to EDGAR · Narrative written by AI · Aug 13, 2026 · How we verify