[Form 4] Main Street Capital CORP Insider Trading Activity

Rhea-AI Filing Summary

Main Street Capital director Jon Kevin Griffin reinvested dividends into additional common shares through a dividend reinvestment plan. The Form 4 reports four "other" transactions on common stock that together reflect 555.352 shares tied to this plan, at prices between $51.53 and $54.89 per share.

According to the filing, these dividend reinvestment transactions are exempt from Section 16 under Rule 16a-11 and are not open-market trades. Following the most recent transaction, Griffin directly holds 71,383.536 shares of Main Street Capital common stock.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider Griffin Jon Kevin

Role Director

Type	Security	Shares	Price	Value
Other	Common Stock	24.579	$52.92	$1K
Other	Common Stock	281.939	$51.53	$15K
Other	Common Stock	20.526	$54.66	$1K
Other	Common Stock	228.308	$54.89	$13K

Holdings After Transaction: Common Stock — 71,101.597 shares (Direct)

Footnotes (1)

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Key Figures

Dividend reinvestment shares: 555.352 shares Transaction price: $52.92 per share Transaction price: $51.53 per share +4 more

7 metrics

Dividend reinvestment shares 555.352 shares Total restructuringShares under code J dividend reinvestment

Transaction price $52.92 per share 24.579 shares recorded under dividend reinvestment

Transaction price $51.53 per share 281.939 shares recorded under dividend reinvestment

Transaction price $54.89 per share 228.308 shares recorded under dividend reinvestment

Transaction price $54.66 per share 20.526 shares recorded under dividend reinvestment

Post-transaction holdings 71,383.536 shares Director’s direct ownership after latest dividend reinvestment entry

Other transactions count 4 transactions All reported under code J as other acquisition or disposition

Key Terms

dividend reinvestment plan, Section 16, Rule 16a-11, Other acquisition or disposition

4 terms

dividend reinvestment plan financial

"The reporting person acquired these shares under a dividend reinvestment plan, pursuant to a dividend reinvestment transaction..."

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

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

Other acquisition or disposition financial

"transaction_code_description": "Other acquisition or disposition""

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^*

Griffin Jon Kevin

(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	20.526	A	$54.66	70,848.71	D
Common Stock	03/13/2026		J(1)	V	228.308	A	$54.89	71,077.018	D
Common Stock	03/27/2026		J(1)	V	24.579	A	$52.92	71,101.597	D
Common Stock	03/27/2026		J(1)	V	281.939	A	$51.53	71,383.536	D

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.

	/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 did Main Street Capital (MAIN) director Jon Kevin Griffin report on this Form 4?

Director Jon Kevin Griffin reported four "other" transactions in Main Street Capital common stock. These reflect dividend reinvestment activity, where cash dividends were automatically used to obtain additional shares under a dividend reinvestment plan, rather than open-market trading.

How many Main Street Capital (MAIN) shares were involved in the reported dividend reinvestment activity?

The transactions together involve 555.352 common shares of Main Street Capital. These shares were credited through a dividend reinvestment plan in multiple small entries, each at specific prices per share, instead of being acquired or sold through standard market trades.

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

The shares were recorded at prices between $51.53 and $54.89 per share. Each transaction line in the Form 4 shows a small share amount and a corresponding price, reflecting how cash dividends were converted into fractional common shares under the reinvestment plan.

How many Main Street Capital (MAIN) shares does Jon Kevin Griffin hold after these transactions?

After the latest reported transaction, Jon Kevin Griffin directly holds 71,383.536 Main Street Capital common shares. This total reflects his updated ownership after the dividend reinvestment entries, as shown by the post-transaction share balance on the Form 4.

Are the Main Street Capital (MAIN) Form 4 transactions open-market buys or sells?

They are not open-market buys or sells. The filing identifies them as "other" transactions under code J, and the footnote explains they arose from a dividend reinvestment plan, which is exempt from Section 16 reporting as open-market trading under SEC Rule 16a-11.

Why are these Main Street Capital (MAIN) transactions described as exempt under Rule 16a-11?

They are exempt because they come from a dividend reinvestment plan transaction. Rule 16a-11 provides an exemption for certain dividend reinvestment activity, where dividends are automatically converted into additional shares instead of being taken in cash, reducing trading-signal significance.