Main Street Capital (NYSE: MAIN) director reports share grant and trust holdings

Rhea-AI Filing Summary

Main Street Capital Corp director Vincent D. Foster reported routine equity-related changes in his holdings. He received 538 shares of Common Stock as a grant under the Main Street Capital Corporation Non-Employee Director Restricted Stock Plan, bringing his directly held shares to 1,742,295.0845.

He also reported other transactions totaling 1,397.8007 shares of Common Stock at $56.39 per share classified as “other acquisition or disposition,” tied to a dividend reinvestment plan exempt under Rule 16a-11. In addition, indirect holdings are reported through four family trusts labeled MS Trust I, II, III, and V.

Insider Trade Summary

7 transactions reported

Mixed 7 txns

Insider FOSTER VINCENT D

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	538	$0.00	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
Other	Common Stock	12.972	$56.39	$731.49
Other	Common Stock	1,384.829	$56.39	$78K

Holdings After Transaction: Common Stock — 1,742,295.085 shares (Direct, null); 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. Shares issued under the Main Street Capital Corporation Non-Employee Director Restricted Stock Plan. Family trust

Key Figures

Director grant: 538 shares Grant price: $0.0000 per share Direct holdings after grant: 1,742,295.0845 shares +5 more

8 metrics

Director grant 538 shares Common Stock grant under Non-Employee Director Restricted Stock Plan

Grant price $0.0000 per share Price per share for 538-share director stock grant

Direct holdings after grant 1,742,295.0845 shares Common Stock directly held by Vincent D. Foster after reported transactions

Other J-code shares 1,397.8007 shares Total shares in ‘other acquisition or disposition’ at $56.39 per share

J-code price $56.39 per share Price per share for J-code Common Stock transactions

MS Trust V holdings 33,300.0000 shares Common Stock held indirectly through MS Trust V

MS Trust III holdings 34,557.0000 shares Common Stock held indirectly through MS Trust III

MS Trust I holdings 35,307.4742 shares Common Stock held indirectly through MS Trust I

Key Terms

dividend reinvestment plan, Rule 16a-11, Non-Employee Director Restricted Stock Plan, Family trust, +1 more

5 terms

dividend reinvestment plan financial

"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."

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

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

Non-Employee Director Restricted Stock Plan financial

"Shares issued under the Main Street Capital Corporation Non-Employee Director Restricted Stock Plan."

Family trust financial

"Family trust"

Grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

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)
05/04/2026

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	04/15/2026		J(1)	V	12.972	A	$56.39	1,740,372.2558	D
Common Stock	04/15/2026		J(1)	V	1,384.8287	A	$56.39	1,741,757.0845	D
Common Stock	05/04/2026		A(2)		538	A	$0	1,742,295.0845	D
Common Stock								35,307.4742	I	MS Trust I(3)
Common Stock								34,557	I	MS Trust II(3)
Common Stock								34,557	I	MS Trust III(3)
Common Stock								33,300	I	MS Trust V(3)

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. Shares issued under the Main Street Capital Corporation Non-Employee Director Restricted Stock Plan.

3. Family trust

	/s/ Jason B. Beauvais, Attorney-in-Fact	05/06/2026
	** 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 did Main Street Capital (MAIN) director Vincent D. Foster report in this Form 4?

Director Vincent D. Foster reported routine equity changes, including a 538-share grant of Common Stock as director compensation and additional “other” transactions related to a dividend reinvestment plan, along with updated indirect holdings through several family trusts associated with him.

How many Main Street Capital (MAIN) shares does Vincent D. Foster hold directly after these transactions?

After these transactions, Vincent D. Foster directly holds 1,742,295.0845 shares of Main Street Capital Common Stock. This figure reflects both the 538-share restricted stock grant and the “other” classified share movements reported in the filing on his direct ownership line.

What is the nature of the 538-share Main Street Capital (MAIN) grant to Vincent D. Foster?

The 538-share grant to Vincent D. Foster is a stock award under the Main Street Capital Corporation Non-Employee Director Restricted Stock Plan. It represents compensation in shares rather than cash, with a reported price per share of $0.0000 in the filing.

What are the ‘J’ code transactions reported by Vincent D. Foster in MAIN stock?

The Form 4 lists two ‘J’ code transactions totaling 1,397.8007 shares of Main Street Capital Common Stock at $56.39 per share. These are described as “other acquisition or disposition” events, tied to a dividend reinvestment plan exempt under Rule 16a-11.

Does the Form 4 show any open-market buying or selling of Main Street Capital (MAIN) shares?

The Form 4 does not show open-market purchases or sales. Instead, it reports a director stock grant and “other” transactions related to a dividend reinvestment plan, along with updated indirect positions held through multiple family trusts associated with Vincent D. Foster.

How are Vincent D. Foster’s indirect Main Street Capital (MAIN) holdings structured?

Indirect holdings are reported through four family trusts identified as MS Trust I, MS Trust II, MS Trust III, and MS Trust V. Each trust holds a separate block of Main Street Capital Common Stock, reflecting family trust ownership reported as indirect interests in the filing.