Main Street Capital files Schedule 13D on MSC Income Fund stake, says it has no plans to act under items (a) through (j)

Main Street Capital Corp filed a Schedule 13D with the SEC on 4 November 2026 disclosing its holding in MSC Income Fund, Inc. The filing states that neither Main Street Capital nor, to its knowledge, any director or executive officer listed on its Annex A "has any present plans or proposals" that would result in actions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D.

The filing says the percentage of class is calculated based on 45,119,875 shares of MSC Income Fund common stock outstanding as of the applicable date, according to information the reporting person says it obtained from the issuer. The filing does not state in the excerpt provided the number of shares or the percentage of the class that Main Street Capital itself beneficially owns.

The filing describes two existing arrangements between the two companies. In January 2025, in connection with Main Street Capital's potential acquisition of more than 3% of MSC Income Fund's outstanding common stock, the companies entered into a Fund of Funds Investment Agreement, which the filing says provides for share purchases and sales consistent with Rule 12d1-4 under the Investment Company Act of 1940. In February 2026, Main Street Capital provided MSC Income Fund with an Unsecured Revolving Promissory Note that currently allows for borrowings of up to $30.0 million, bearing interest at SOFR plus 4.5% subject to a 2.0% SOFR floor, maturing in December 2029 and subject to a 0.25% non-use fee on available borrowings, per the filing.

The filing also references an Amended and Restated Investment Advisory and Administrative Services Agreement between MSC Income Fund and its adviser, dated 29 January 2025, previously filed as an exhibit to an 8-K on 4 February 2025. The Schedule 13D was signed by Jason B. Beauvais, General Counsel of Main Street Capital Corp, on 4 November 2026.