Director Vincent Foster adds MAIN shares through dividend reinvestment plan

Rhea-AI Filing Summary

Main Street Capital CORP director Vincent D. Foster increased his stake through dividend reinvestments. On March 13 and March 27, he acquired a total of 3,136.0254 shares of common stock at prices of $54.66 and $52.92 per share under a dividend reinvestment plan.

Following these transactions, Foster directly owned 1,740,359.2838 shares of Main Street Capital common stock. Additional shares are held indirectly in several family trusts, reflecting a substantial ongoing equity position aligned with dividend payouts rather than open-market trading.

Insider Trade Summary

8 transactions reported

Mixed 8 txns

Insider FOSTER VINCENT D

Role Director

Type	Security	Shares	Price	Value
Other	Common Stock	15.85	$52.92	$838.78
Other	Common Stock	1,693.055	$52.92	$90K
Other	Common Stock	13.24	$54.66	$723.70
Other	Common Stock	1,413.88	$54.66	$77K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 1,738,666.228 shares (Direct); Common Stock — 35,307.474 shares (Indirect, MS Trust I)

Footnotes (1)

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. Family trust

Key Figures

Dividend reinvestment shares: 3,136.0254 shares Reinvestment price March 13: $54.66 per share Reinvestment price March 27: $52.92 per share +5 more

8 metrics

Dividend reinvestment shares 3,136.0254 shares Total common shares acquired via dividend reinvestment in March 2026

Reinvestment price March 13 $54.66 per share Price used for dividend reinvestment on March 13, 2026

Reinvestment price March 27 $52.92 per share Price used for dividend reinvestment on March 27, 2026

Direct holdings after transactions 1,740,359.2838 shares Main Street Capital common stock directly owned after March 27, 2026

MS Trust I holdings 35,307.4742 shares Indirect Main Street Capital common stock held by MS Trust I

MS Trust II holdings 34,557.0000 shares Indirect Main Street Capital common stock held by MS Trust II

MS Trust III holdings 34,557.0000 shares Indirect Main Street Capital common stock held by MS Trust III

MS Trust V holdings 33,300.0000 shares Indirect Main Street Capital common stock held by MS Trust V

Key Terms

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

4 terms

dividend reinvestment plan financial

"The reporting person acquired these shares under a dividend reinvestment plan"

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.

Rule 16a-11 regulatory

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

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.

family trust financial

"Family trust"

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^*

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)
03/13/2026

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	03/13/2026		J(1)	V	13.24	A	$54.66	1,737,236.4984	D
Common Stock	03/13/2026		J(1)	V	1,413.88	A	$54.66	1,738,650.3784	D
Common Stock	03/27/2026		J(1)	V	15.85	A	$52.92	1,738,666.2284	D
Common Stock	03/27/2026		J(1)	V	1,693.0554	A	$52.92	1,740,359.2838	D
Common Stock								35,307.4742	I	MS Trust I(2)
Common Stock								34,557	I	MS Trust II(2)
Common Stock								34,557	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	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 activity did Main Street Capital (MAIN) disclose in this Form 4?

The filing shows director Vincent D. Foster acquired additional Main Street Capital common shares through a dividend reinvestment plan, rather than open-market trades, modestly increasing his equity position while reinvesting cash dividends back into the company’s stock.

How many Main Street Capital (MAIN) shares did Vincent D. Foster acquire?

He acquired 3,136.0254 Main Street Capital common shares, consisting of transactions on March 13 and March 27. These were recorded as “other” transactions tied to dividend reinvestment, not traditional market purchases or sales, modestly adding to his existing ownership stake.

At what prices were the Main Street Capital (MAIN) dividend reinvestment shares recorded?

The dividend reinvestment transactions were recorded at $54.66 per share on March 13 and $52.92 per share on March 27. These prices represent the share values used for reinvesting cash dividends into additional common stock under the company’s dividend reinvestment plan.

What is Vincent D. Foster’s direct Main Street Capital (MAIN) ownership after the transactions?

After the March dividend reinvestment transactions, Foster directly owned 1,740,359.2838 Main Street Capital common shares. This figure reflects only his direct holdings and excludes additional shares reported as indirectly owned through various family trusts listed in the filing.

How are Main Street Capital (MAIN) family trust holdings reported in this Form 4?

The Form 4 lists indirect holdings in several family trusts, including MS Trust I, MS Trust II, MS Trust III, and MS Trust V. Each trust’s total Main Street Capital share balance is reported separately, indicating indirect ownership associated with Foster but distinct from his direct shareholdings.