[Form 4] SIMMONS FIRST NATIONAL CORP Insider Trading Activity

Rhea-AI Filing Summary

Marty Casteel, a director of Simmons First National Corporation (SFNC), reported the vesting and conversion of restricted stock units into common shares. On 10/01/2025 1,489 restricted stock units (RSUs) vested and were reported as acquired (929 RSUs in one grant and 560 in another), increasing his reported beneficial ownership to 215,390 shares of SFNC common stock. The filing states RSUs convert on a one-for-one basis and that 928 RSUs remain scheduled to vest on 01/02/2026, with shares to be delivered within 30 days of vesting. The Form 4 was signed by an attorney-in-fact on behalf of Mr. Casteel on 10/03/2025.

Positive

• 1,489 RSUs vested on 10/01/2025 (929 and 560 units)
• Beneficial ownership increased to 215,390 shares following the reported transactions
• RSUs convert 1-for-1 into SFNC common stock, per the filing

Negative

• None.

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
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Casteel Marty

(Last) (First) (Middle)

C/O SIMMONS FIRST NATIONAL CORP.

501 MAIN STREET

(Street)

PINE BLUFF AR 71601

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
SIMMONS FIRST NATIONAL CORP [ SFNC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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
SFNC Common Stock	10/01/2025		M		929	A	(1)	214,830	D
SFNC Common Stock	10/01/2025		M		560	A	(1)	215,390	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
SFNC Common Stock	(1)	10/01/2025		M			929	(2)	(2)	SFNC Common Stock	929	$0	928(3)	D
SFNC Common Stock	(1)	10/01/2025		M			560	(2)	(2)	SFNC Common Stock	560	$0	0	D

Explanation of Responses:

1. Restricted Stock Units convert into shares of SFNC common stock on a one-for-one basis.

2. The Restricted Stock Units vested on October 1, 2025.

3. 928 Restricted Stock Units vest on January 2, 2026. SFNC shares will be delivered within 30 days of vesting. Events such as retirement, death, disability, and other specified events in the award agreement may result in earlier vesting.

	/s/ Natalie Gassiott, attorney-in-fact for Marty Casteel	10/03/2025
	** 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.

FAQ

What did SFNC director Marty Casteel report on Form 4?

The Form 4 reports the vesting and acquisition of 1,489 RSUs on 10/01/2025, increasing his beneficial ownership to 215,390 shares.

How many RSUs vested and converted to shares for Marty Casteel?

929 RSUs from one grant and 560 RSUs from another vested and were reported as acquired (total 1,489).

When will the remaining RSUs vest and when are shares delivered?

The filing states 928 RSUs vest on 01/02/2026, and SFNC shares will be delivered within 30 days of vesting.

What is Marty Casteel's relationship to SFNC in this filing?

The Form 4 identifies Marty Casteel as a Director of Simmons First National Corporation.

Was any cash paid for these RSUs according to the Form 4?

No cash price is reported; the RSUs convert on a one-for-one basis into common stock per the filing.

Who signed the Form 4 and when was it signed?

The Form 4 was signed by Natalie Gassiott, attorney-in-fact for Marty Casteel on 10/03/2025.