Main Street director adds shares via DRIP

Main Street Capital director John Earl Jackson acquired additional common shares through a dividend reinvestment plan.

Rhea-AI Filing Summary

Main Street Capital director John Earl Jackson acquired additional common shares through a dividend reinvestment plan. On May 15, 2026, he received a total of 361.047 shares at prices around $50.45–$50.69 per share, including 10 shares held indirectly through his wife.

Following these transactions, Jackson directly holds about 84,402.5519 shares of Main Street Capital common stock and indirectly holds 2,026 shares through his spouse.

Insider Trade Summary

Other: 361.047 shares

Other 3 txns

Insider JACKSON JOHN EARL

Role Director

Type	Security	Shares	Price	Value
Other	Common Stock	98.413	$50.69	$5K
Other	Common Stock	252.634	$50.45	$13K
Other	Common Stock	10	$50.485	$504.85

Holdings After Transaction: Common Stock — 84,402.5519 shares (Direct); Common Stock — 2,026 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

Dividend reinvestment total: 361.047 shares Indirect DRIP lot: 10 shares at $50.485 Direct DRIP lot 1: 252.634 shares at $50.45 +3 more

6 metrics

Dividend reinvestment total 361.047 shares Common Stock acquired via dividend reinvestment on May 15, 2026

Indirect DRIP lot 10 shares at $50.485 Common Stock, indirectly owned by wife, May 15, 2026

Direct DRIP lot 1 252.634 shares at $50.45 Common Stock, direct ownership, May 15, 2026

Direct DRIP lot 2 98.413 shares at $50.69 Common Stock, direct ownership, May 15, 2026

Direct holdings after 84,149.9179 shares Total direct Common Stock following transactions

Indirect holdings after 2,026 shares Total indirectly owned Common Stock through wife after transaction

Key Terms

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

4 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

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

Section 16 regulatory

"pursuant to a 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.

transaction code J regulatory

"transaction_code_description": "Other acquisition or disposition""

FAQ

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

What insider transaction did MAIN director John Earl Jackson report?

John Earl Jackson reported acquiring additional Main Street Capital common shares through a dividend reinvestment plan. The Form 4 shows several small transactions on May 15, 2026, classified as “other acquisition or disposition” under transaction code J.

How many MAIN shares did John Earl Jackson acquire via dividend reinvestment?

He acquired a total of 361.047 Main Street Capital common shares through dividend reinvestment. The transactions included 252.634 shares and 98.413 shares held directly, plus 10 shares held indirectly through his wife, all on May 15, 2026.

At what prices were John Earl Jackson’s MAIN dividend reinvestment shares recorded?

The dividend reinvestment transactions were recorded at prices around $50.45 to $50.69 per Main Street Capital share. Specific entries include $50.45, $50.485, and $50.69 per share for the various small lot acquisitions disclosed in the Form 4.

How many MAIN shares does John Earl Jackson hold after these transactions?

After the May 15, 2026 transactions, Jackson holds 84,149.9179 Main Street Capital shares directly. He also has 2,026 shares reported as indirectly owned through his wife, reflecting the updated positions disclosed in the Form 4 filing.

What does transaction code J mean in the MAIN Form 4 filing?

Transaction code J in this Form 4 indicates “other acquisition or disposition” of securities. Here, the footnote explains the shares were acquired under a dividend reinvestment plan in a transaction exempt from Section 16 under SEC Rule 16a-11.

Is John Earl Jackson’s MAIN dividend reinvestment transaction exempt from Section 16?

Yes, the footnote states the shares were acquired under a dividend reinvestment plan in a transaction exempt from Section 16 under SEC Rule 16a-11. This clarifies the regulatory treatment of these routine reinvestment-based acquisitions.

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

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Accepted by SEC EDGAR 05/28/2026 - 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)
05/15/2026

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	05/15/2026		J(1)	V	98.413	A	$50.69	84,149.9179	D
Common Stock	05/15/2026		J(1)	V	252.634	A	$50.45	84,402.5519	D
Common Stock	05/15/2026		J(1)	V	10	A	$50.485	2,026	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	05/28/2026
	** 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)