Main Street Capital director Foster acquires shares

A separate position entry lists 33,300 common shares indirectly held through MS Trust V on September 15, 2026.

Rhea-AI Filing Summary

Main Street Capital Corp. director Vincent D. Foster reported common-stock acquisitions under a dividend reinvestment plan on September 15 and September 28, 2026, at $56.3700 and $55.1000 per share, respectively. Direct entries include 1,114 shares on September 15 and 1,297 shares on September 28; other entries name family trusts MS Trust I, MS Trust II and MS Trust III.

Insider Trade Summary

Other: 3,165.9175 shares

Other 11 txns

Insider FOSTER VINCENT D

Role Director

Type	Security	Shares	Price	Value
Other	Common Stock F1	15.8584	$55.10	$873.80
Other	Common Stock F1	1,296.6786	$55.10	$71K
Other	Common Stock F1, F2	99.0873	$55.10	$5K
Other	Common Stock F1, F2	191.951	$55.10	$11K
Other	Common Stock F1, F2	99.0873	$55.10	$5K
Other	Common Stock F1	13.6287	$56.37	$768.25
Other	Common Stock F1	1,114.3552	$56.37	$63K
Other	Common Stock F1, F2	85.1549	$56.37	$5K
Other	Common Stock F1, F2	164.9612	$56.37	$9K
Other	Common Stock F1, F2	85.1549	$56.37	$5K
holding	Common Stock F2	--	--	--

Holdings After Transaction: Common Stock — 1,680,117.77 shares (Direct); Common Stock — 71,355.5934 shares (Indirect, MS Trust I); Common Stock — 35,619.6704 shares (Indirect, MS Trust II); Common Stock — 70,605.1192 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

Direct shares acquired: 1,114 shares Direct shares acquired: 1,297 shares MS Trust II shares acquired: 165 shares +4 more

7 metrics

Direct shares acquired 1,114 shares Direct entry dated September 15, 2026

Direct shares acquired 1,297 shares Direct entry dated September 28, 2026

MS Trust II shares acquired 165 shares Indirect entry dated September 15, 2026

MS Trust II shares acquired 192 shares Indirect entry dated September 28, 2026

Per-share price $56.3700 per share Acquisitions dated September 15, 2026

Per-share price $55.1000 per share Acquisitions dated September 28, 2026

MS Trust V common shares held 33,300 shares Indirect holding entry dated September 15, 2026

Key Terms

dividend reinvestment plan, dividend reinvestment transaction, Section 16, Rule 16a-11

4 terms

dividend reinvestment plan financial

"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.

dividend reinvestment transaction financial

"pursuant to a dividend reinvestment transaction"

A dividend reinvestment transaction is when an investor uses cash dividends paid by a company to automatically buy more of that company's shares instead of taking the money as cash. Like choosing to roll interest back into a savings account, it increases your share count over time and can speed up growth through compounding, so investors care because it changes ownership stake, long‑term returns, and sometimes tax or record‑keeping implications.

Section 16 regulatory

"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

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

FAQ

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

What transaction type was used for Vincent D. Foster's MAIN share acquisitions?

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

How many MAIN shares were listed under MS Trust V?

33,300 common shares were listed as indirectly held through MS Trust V on September 15, 2026.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 10/20/2026 - 04:30 PM EDT Accepted by SEC EDGAR 10/20/2026 - 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)
09/15/2026

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	09/15/2026		J(1)	V	13.6287	A	$56.37	1,677,690.8778	D
Common Stock	09/15/2026		J(1)	V	1,114.3552	A	$56.37	1,678,805.233	D
Common Stock	09/28/2026		J(1)	V	15.8584	A	$55.1	1,678,821.0914	D
Common Stock	09/28/2026		J(1)	V	1,296.6786	A	$55.1	1,680,117.77	D
Common Stock	09/15/2026		J(1)	V	85.1549	A	$56.37	71,256.5061	I	MS Trust I(2)
Common Stock	09/28/2026		J(1)	V	99.0873	A	$55.1	71,355.5934	I	MS Trust I(2)
Common Stock	09/15/2026		J(1)	V	164.9612	A	$56.37	35,427.7194	I	MS Trust II(2)
Common Stock	09/28/2026		J(1)	V	191.951	A	$55.1	35,619.6704	I	MS Trust II(2)
Common Stock	09/15/2026		J(1)	V	85.1549	A	$56.37	70,506.0319	I	MS Trust III(2)
Common Stock	09/28/2026		J(1)	V	99.0873	A	$55.1	70,605.1192	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	10/20/2026
	** 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)