Main Street Capital's John Earl Jackson acquires shares

The indirect September 15 transaction left the reported wife-held position at 2,064 common shares.

Rhea-AI Filing Summary

Main Street Capital director John Earl Jackson reported five common-stock acquisitions through a dividend reinvestment plan, exempt from Section 16 under Rule 16a-11. On September 15, 2026, he directly acquired 93 shares at $56.37 and 236 shares at $56.54. His wife acquired 9 shares indirectly at $56.24; her reported position after that transaction was 2,064 shares. On September 28, 2026, Jackson directly acquired 108 shares at $55.10 and 275 shares at $55.07. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Other: 720.066 shares

Other 5 txns

Insider JACKSON JOHN EARL

Role Director

Type	Security	Shares	Price	Value
Other	Common Stock F1	107.657	$55.10	$6K
Other	Common Stock F1	275.211	$55.07	$15K
Other	Common Stock F1	92.52	$56.37	$5K
Other	Common Stock F1	235.678	$56.54	$13K
Other	Common Stock F1	9	$56.24	$506.16

Holdings After Transaction: Common Stock — 86,519.6379 shares (Direct); Common Stock — 2,064 shares (Indirect, By Wife)

Footnotes (1)

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.

Key Figures

Direct common shares acquired: 93 shares at $56.37 per share Direct common shares acquired: 236 shares at $56.54 per share Indirect common shares acquired through wife: 9 shares at $56.24 per share +3 more

6 metrics

Direct common shares acquired 93 shares at $56.37 per share September 15, 2026

Direct common shares acquired 236 shares at $56.54 per share September 15, 2026

Indirect common shares acquired through wife 9 shares at $56.24 per share September 15, 2026

Reported indirect common shares following transaction 2,064 shares Position held by wife after the September 15, 2026 transaction

Direct common shares acquired 108 shares at $55.10 per share September 28, 2026

Direct common shares acquired 275 shares at $55.07 per share September 28, 2026

Key Terms

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

3 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.

Rule 16a-11 regulatory

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

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.

FAQ

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

What shares did MAIN director John Earl Jackson acquire?

Jackson reported directly acquiring 93 shares at $56.37 and 236 shares at $56.54 on September 15, 2026, and 108 shares at $55.10 and 275 shares at $55.07 on September 28, 2026. His wife acquired 9 shares indirectly at $56.24 on September 15; her reported position afterward was 2,064 shares. The acquisitions were under a dividend reinvestment plan.

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^*

JACKSON JOHN EARL

(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	92.52	A	$56.37	85,901.0919	D
Common Stock	09/15/2026		J(1)	V	235.678	A	$56.54	86,136.7699	D
Common Stock	09/28/2026		J(1)	V	107.657	A	$55.1	86,244.4269	D
Common Stock	09/28/2026		J(1)	V	275.211	A	$55.07	86,519.6379	D
Common Stock	09/15/2026		J(1)	V	9	A	$56.24	2,064	I	By Wife

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	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)