Main Street director buys 1,386 shares at $59.23

A director of Main Street Capital CORP reported dividend reinvestment acquisitions of common stock held directly and in multiple family trusts.

Rhea-AI Filing Summary

Main Street Capital CORP (MAIN) director Vincent D. Foster reported acquiring common stock on August 14, 2026 through a dividend reinvestment plan exempt from Section 16 under Rule 16a-11. The filing lists a total of 1,386.3963 shares acquired at $59.23 per share, held both directly and indirectly through family trusts MS Trust I, II and III. The filing also reports indirect family trust holdings in MS Trust V, and no transactions are indicated as made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Other: 1,386.3963 shares

Other 6 txns

Insider FOSTER VINCENT D

Role Director

Type	Security	Shares	Price	Value
Other	Common Stock F1	12.9127	$59.23	$764.82
Other	Common Stock F1	1,055.8232	$59.23	$63K
Other	Common Stock F1, F2	80.682	$59.23	$5K
Other	Common Stock F1, F2	156.2964	$59.23	$9K
Other	Common Stock F1, F2	80.682	$59.23	$5K
holding	Common Stock F2	--	--	--

Holdings After Transaction: Common Stock — 1,677,677.2491 shares (Direct); Common Stock — 71,171.3512 shares (Indirect, MS Trust I); Common Stock — 35,262.7582 shares (Indirect, MS Trust II); Common Stock — 70,420.877 shares (Indirect, MS Trust III); Common Stock — 33,300 shares (Indirect, MS Trust V)

Footnotes (2)

1. F1. The reporting person acquired these shares under a dividend reinvestment plan, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.
2. F2. Family trust

Key Figures

Total shares acquired via dividend reinvestment: 1,386.3963 shares Price per share in dividend reinvestment: $59.23 per share Indirect holdings in MS Trust I: 71,171.3512 shares +3 more

6 metrics

Total shares acquired via dividend reinvestment 1,386.3963 shares Restructuring (code J) acquisitions on August 14, 2026

Price per share in dividend reinvestment $59.23 per share All reported acquisitions on August 14, 2026

Indirect holdings in MS Trust I 71,171.3512 shares Common stock held indirectly after August 14, 2026

Indirect holdings in MS Trust II 35,262.7582 shares Common stock held indirectly after August 14, 2026

Indirect holdings in MS Trust III 70,420.8770 shares Common stock held indirectly after August 14, 2026

Indirect holdings in MS Trust V 33,300.0000 shares Common stock holding entry reported as of August 14, 2026

Key Terms

dividend reinvestment plan, Section 16, Rule 16a-11, Family trust

4 terms

dividend reinvestment plan financial

"acquired these shares under a dividend reinvestment plan, pursuant to a dividend"

A dividend reinvestment plan lets shareholders automatically use cash dividends to buy more shares of the same company instead of receiving the money. It matters to investors because it turns regular payouts into a steady way to grow ownership and take advantage of compound returns—like having your savings automatically buy additional slices of a pie over time—while often reducing transaction costs and smoothing purchase timing.

Section 16 regulatory

"dividend reinvestment transaction exempt from Section 16 under Rule 16a-11"

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

Rule 16a-11 regulatory

"transaction exempt from Section 16 under Rule 16a-11"

Family trust financial

"Family trust"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider activity did MAIN report for director Vincent D. Foster on August 14, 2026?

The filing reports that director Vincent D. Foster acquired 1,386.3963 shares of Main Street Capital CORP common stock on August 14, 2026 through a dividend reinvestment plan, at a reported price of $59.23 per share.

How were the newly acquired MAIN shares held after the August 14, 2026 transactions?

Shares were held directly and indirectly through family trusts. Indirect holdings include 71,171.3512 shares in MS Trust I, 35,262.7582 shares in MS Trust II, 70,420.8770 shares in MS Trust III, and 33,300.0000 shares in MS Trust V.

What was the price used for the dividend reinvestment transactions in MAIN stock?

Each dividend reinvestment transaction used a price of $59.23 per share for Main Street Capital CORP common stock, as shown for all reported acquisitions on August 14, 2026.

Were the August 14, 2026 MAIN insider transactions under a Rule 10b5-1 plan?

No. The document-level indicator for Rule 10b5-1 trading plans is false, and the footnotes do not state that these transactions were made under any Rule 10b5-1 or similar pre-arranged trading plan.

What is the nature of the indirect ownership of MAIN shares in this Form 4?

Indirect holdings are described as Family trust interests. The filing identifies MS Trust I, MS Trust II, MS Trust III, and MS Trust V as the entities through which Vincent D. Foster indirectly holds Main Street Capital CORP common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/15/2026 - 04:30 PM EDT Accepted by SEC EDGAR 09/15/2026 - 04:30 PM EDT Learn about SEC filing dates

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^*

FOSTER VINCENT D

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

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	08/14/2026		J(1)	V	12.9127	A	$59.23	1,676,621.4259	D
Common Stock	08/14/2026		J(1)	V	1,055.8232	A	$59.23	1,677,677.2491	D
Common Stock	08/14/2026		J(1)	V	80.682	A	$59.23	71,171.3512	I	MS Trust I(2)
Common Stock	08/14/2026		J(1)	V	156.2964	A	$59.23	35,262.7582	I	MS Trust II(2)
Common Stock	08/14/2026		J(1)	V	80.682	A	$59.23	70,420.877	I	MS Trust III(2)
Common Stock								33,300	I	MS Trust V(2)

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. The reporting person acquired these shares under a dividend reinvestment plan, pursuant to a dividend reinvestment transaction exempt from Section 16 under Rule 16a-11.

2. Family trust

	/s/ Jason B. Beauvais, Attorney-in-Fact	09/15/2026
	** 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)