Equity grant lifts Main Street Capital (NYSE: MAIN) executive stake

Rhea-AI Filing Summary

Main Street Capital managing director Nicholas Meserve received 21,762 shares of common stock as a grant under the company’s 2022 Equity and Incentive Plan. The shares were issued at no cash cost to him.

On the same date, 7,700 shares were withheld at $52.96 per share to cover tax obligations upon the vesting of restricted shares, a transaction approved by the Board’s Compensation Committee under Rule 16b-3. After these entries, Meserve directly owns 96,444.7027 shares of Main Street Capital common stock.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Meserve Nicholas

Role MANAGING DIRECTOR

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	21,762	$0.00	--
Tax Withholding	Common Stock	7,700	$52.96	$408K

Holdings After Transaction: Common Stock — 104,144.703 shares (Direct)

Footnotes (1)

1. Shares issued under the Main Street Capital Corporation 2022 Equity and Incentive Plan. Shares withheld for payment of tax liability upon vesting of restricted shares granted under the Main Street Capital Corporation 2022 Equity and Incentive Plan. This withholding transaction was approved by the Compensation Committee of Main Street's Board of Directors in accordance with Rule 16b-3(d)(1) of the Securities Exchange Act of 1934 (the "Act"), and as such, the sale is exempt from section 16(b) of the Act pursuant to Rule 16b-3(e) promulgated thereunder.

Key Figures

Equity grant: 21,762 shares Shares withheld for taxes: 7,700 shares Withholding price: $52.96 per share +2 more

5 metrics

Equity grant 21,762 shares Common stock awarded under 2022 Equity and Incentive Plan

Shares withheld for taxes 7,700 shares Tax-withholding on vesting of restricted shares

Withholding price $52.96 per share Price used for tax-withholding transaction

Post-transaction holdings 96,444.7027 shares Direct ownership after grant and tax withholding

Net shares added 14,062 shares Grant of 21,762 less 7,700 shares withheld for taxes

Key Terms

restricted shares, Rule 16b-3, Section 16(b), 2022 Equity and Incentive Plan

4 terms

restricted shares financial

"upon vesting of restricted shares granted under the Main Street Capital Corporation 2022 Equity and Incentive Plan"

Restricted shares are company stock that cannot be sold or transferred immediately because they are subject to legal or contractual limits, such as a required holding period or performance conditions. They matter to investors because these locked-up shares can affect a company’s available stock for trading, future dilution, and insider incentives—imagine a gift that can’t be cashed until certain conditions are met, which changes when and how much supply can suddenly enter the market.

Rule 16b-3 regulatory

"approved by the Compensation Committee ... in accordance with Rule 16b-3(d)(1) of the Securities Exchange Act of 1934"

Rule 16b-3 is a Securities and Exchange Commission regulation that exempts certain routine, pre-approved transactions by company insiders from automatic liability for short-term trading profits. It acts like a safe harbor: if an insider follows a formal plan or the board approves specific transactions in advance, profits from buying and selling company stock within six months are not automatically reclaimed. Investors care because the rule clarifies when insider trades are permissible and reduces uncertainty about potential clawbacks.

Section 16(b) regulatory

"the sale is exempt from section 16(b) of the Act pursuant to Rule 16b-3(e)"

A federal rule that requires company insiders—like officers, directors and large shareholders—to return any profits made from buying and selling the company’s stock within a six-month window. It matters to investors because it discourages short-term trades that could exploit non-public information and helps protect outside shareholders by creating a simple, enforceable way to recover unfair gains, much like a rule stopping someone from flipping a limited-edition item for quick profit after getting early access.

2022 Equity and Incentive Plan financial

"Shares issued under the Main Street Capital Corporation 2022 Equity and Incentive Plan"

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Meserve Nicholas

(Last) (First) (Middle)

1300 POST OAK BLVD, 8TH FLOOR

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Main Street Capital CORP [ MAIN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	MANAGING DIRECTOR

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	04/01/2026		A(1)		21,762	A	$0	104,144.7027	D
Common Stock	04/01/2026		F(2)		7,700	D	$52.96	96,444.7027	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares issued under the Main Street Capital Corporation 2022 Equity and Incentive Plan.

2. Shares withheld for payment of tax liability upon vesting of restricted shares granted under the Main Street Capital Corporation 2022 Equity and Incentive Plan. This withholding transaction was approved by the Compensation Committee of Main Street's Board of Directors in accordance with Rule 16b-3(d)(1) of the Securities Exchange Act of 1934 (the "Act"), and as such, the sale is exempt from section 16(b) of the Act pursuant to Rule 16b-3(e) promulgated thereunder.

	/s/ Jason B. Beauvais, Attorney-in-Fact	04/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did MAIN reporting person Nicholas Meserve disclose?

Nicholas Meserve reported receiving 21,762 shares of Main Street Capital common stock as a stock grant. These shares were issued under the company’s 2022 Equity and Incentive Plan, reflecting compensation in equity rather than a market purchase of shares.

How many MAIN shares were withheld for taxes in this Form 4 filing?

The filing shows 7,700 Main Street Capital shares were withheld to pay tax liabilities upon vesting of restricted shares. The withholding occurred at a price of $52.96 per share and was approved by the company’s Compensation Committee under Rule 16b-3.

What is Nicholas Meserve’s MAIN shareholding after these transactions?

After the reported grant and tax withholding, Nicholas Meserve directly holds 96,444.7027 shares of Main Street Capital common stock. This figure reflects his position following the net increase from equity compensation and the related share withholding for tax obligations.

Was the MAIN insider’s share disposition an open-market sale?

No, the disposition was a tax-withholding transaction, not an open-market sale. Shares were withheld to cover tax liability upon vesting of restricted shares, and the transaction was structured under Rule 16b-3, which provides an exemption from Section 16(b) short-swing profit rules.

Under which plan were the MAIN shares granted to the reporting person?

The shares were issued under the Main Street Capital Corporation 2022 Equity and Incentive Plan. This plan provides for equity-based awards, and the reported 21,762-share grant represents compensation rather than a market purchase of the company’s common stock.