Origin Bancorp, Inc. Insider Trading Activity

Origin Bancorp, Inc. Chairman, President and CEO Drake Mills, who also serves as a director, reported the vesting of 25,947 restricted stock units into common stock on December 13, 2025.

Rhea-AI Filing Summary

Origin Bancorp, Inc. Chairman, President and CEO Drake Mills, who also serves as a director, reported the vesting of 25,947 restricted stock units into common stock on December 13, 2025. These units converted into shares on a one-for-one basis at an exercise price of $0.

To satisfy income tax withholding on this vesting, 10,324 common shares were withheld by the issuer at $39.06 per share and do not represent a sale. Following these transactions, Mills beneficially owns 164,257 shares directly, 3,866 shares through an IRA, 57,837 shares through an issuer retirement plan, and 103,789 restricted stock units that remain outstanding.

Insider Trade Summary

25,947 shares exercised/converted

Exercise 5 txns

Insider Mills Drake

Role Chairman, President and CEO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	25,947	$0.00	$0.00
Exercise	Common Stock	25,947	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	10,324	$39.06	$403K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 103,789 contracts (Direct); Common Stock — 164,257 shares (Direct); Common Stock — 3,866 shares (Indirect, By IRA); Common Stock — 57,837 shares (Indirect, BY ISSUER RETIREMENT PLAN)

Footnotes (3)

1. F1. Restricted stock units convert into common stock on a one-for-one basis.
2. F2. Represents the number of common stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of the restricted stock units and does not represent a sale.
3. F3. Granted on December 13, 2022, vest twenty percent on each of the third, fourth, fifth, sixth and seventh anniversaries of the grant date, starting with the first vest date of December 13, 2025.

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Accepted by SEC EDGAR 12/16/2025 - 12:51 PM EST 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^*

Mills Drake

(Last) (First) (Middle)

500 SOUTH SERVICE ROAD EAST

(Street)

RUSTON LA 71270

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Origin Bancorp, Inc. [ OBK ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman, President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
12/13/2025

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
Common Stock	12/13/2025		M		25,947	A	(1)	174,581	D
Common Stock	12/13/2025		F(2)		10,324	D	$39.06	164,257	D
Common Stock								3,866	I	By IRA
Common Stock								57,837	I	BY ISSUER RETIREMENT PLAN

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
Restricted Stock Units	(1)	12/13/2025		M			25,947	(3)	(3)	Common Stock	25,947	$0	103,789(3)	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-for-one basis.

2. Represents the number of common stock that have been withheld by the issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of the restricted stock units and does not represent a sale.

3. Granted on December 13, 2022, vest twenty percent on each of the third, fourth, fifth, sixth and seventh anniversaries of the grant date, starting with the first vest date of December 13, 2025.

Remarks:

	/s/ Drake Mills	12/16/2025
	** 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.