Main Street Capital director Foster acquires shares

The acquisitions were dividend-reinvestment transactions exempt from Section 16 under Rule 16a-11.

Available on EDGAR 11/09/2026 - 04:31 PM EST Accepted by SEC EDGAR 11/09/2026 - 04:30 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Main Street Capital (MAIN) director Vincent D. Foster reported acquiring common shares on October 15, 2026, through dividend reinvestment: 15 and 1,186 shares held directly, and 91 for MS Trust I, 176 for MS Trust II, and 91 for MS Trust III, each at $53.50 per share. These transactions were exempt from Section 16 under Rule 16a-11; no Rule 10b5-1 plan is reported. After the acquisitions, MS Trust I held 71,446 shares, MS Trust II held 35,795, and MS Trust III held 70,696; the form also lists 33,300 shares held by MS Trust V. Share counts are rounded to whole shares.

Insider Trade Summary

Other: 1,557.4325 shares

Other 5 txns

Insider FOSTER VINCENT D

Role Director

Type	Security	Shares	Price	Value
Other	Common Stock F1	14.506	$53.50	$776.07
Other	Common Stock F1	1,186.0772	$53.50	$63K
Other	Common Stock F1, F2	90.6355	$53.50	$5K
Other	Common Stock F1, F2	175.5783	$53.50	$9K
Other	Common Stock F1, F2	90.6355	$53.50	$5K
Holding	Common Stock F2	--	--	--

Holdings After Transaction: Common Stock — 1,681,318.3532 shares (Direct); Common Stock — 71,446.2289 shares (Indirect, MS Trust I); Common Stock — 35,795.2487 shares (Indirect, MS Trust II); Common Stock — 70,695.7547 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 common shares acquired: 15 shares Direct common shares acquired: 1,186 shares MS Trust I common shares acquired: 91 shares +3 more

6 metrics

Direct common shares acquired 15 shares October 15, 2026; rounded to the nearest whole share

Direct common shares acquired 1,186 shares October 15, 2026; rounded to the nearest whole share

MS Trust I common shares acquired 91 shares October 15, 2026; rounded to the nearest whole share

MS Trust II common shares acquired 176 shares October 15, 2026; rounded to the nearest whole share

MS Trust III common shares acquired 91 shares October 15, 2026; rounded to the nearest whole share

Price per share $53.50 per share Reported acquisitions on October 15, 2026

Key Terms

dividend reinvestment plan, exempt from Section 16, Rule 16a-11

3 terms

dividend reinvestment plan financial

"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.

exempt from Section 16 regulatory

"dividend reinvestment transaction exempt from Section 16"

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.

How many MAIN shares did director Vincent D. Foster acquire, and at what price?

The reported acquisitions were 15 and 1,186 shares held directly, plus 91 for MS Trust I, 176 for MS Trust II, and 91 for MS Trust III, at $53.50 per share. The share counts are rounded to whole shares, and no Rule 10b5-1 plan is reported.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

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)
10/15/2026

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	10/15/2026		J(1)	V	14.506	A	$53.5	1,680,132.276	D
Common Stock	10/15/2026		J(1)	V	1,186.0772	A	$53.5	1,681,318.3532	D
Common Stock	10/15/2026		J(1)	V	90.6355	A	$53.5	71,446.2289	I	MS Trust I(2)
Common Stock	10/15/2026		J(1)	V	175.5783	A	$53.5	35,795.2487	I	MS Trust II(2)
Common Stock	10/15/2026		J(1)	V	90.6355	A	$53.5	70,695.7547	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	11/09/2026
	** 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)