CoastalSouth Bancshares (COSO) CEO buys 200 common shares in open market

Rhea-AI Filing Summary

CoastalSouth Bancshares, Inc. President and CEO Stephen R. Stone reported an open-market purchase of 200 shares of common stock at $24.15 per share. Following this transaction, he directly owns 120,385 common shares and indirectly holds 4,830 shares through an IRA.

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

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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).

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^*

Stone Stephen R.

(Last) (First) (Middle)

400 GALLERIA PARKWAY

SUITE 1900

(Street)

ATLANTA GA 30339

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
CoastalSouth Bancshares, Inc. [ COSO ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

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	03/09/2026		P		200	A	$24.15	120,385	D
Common Stock								4,830	I	By IRA

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:

	/s/ Lauren Hemby, Chief Accouting Officer	03/09/2026
	** 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.

FAQ

What insider transaction did COSO CEO Stephen R. Stone report?

Stephen R. Stone reported buying 200 shares of CoastalSouth Bancshares common stock in an open-market purchase at $24.15 per share. This transaction reflects a net increase in his directly held COSO shares according to the Form 4 data.

At what price did the COSO CEO buy CoastalSouth Bancshares shares?

The COSO CEO purchased shares at $24.15 per share in an open-market transaction. This price applies to the 200 common shares acquired, as disclosed in the non-derivative transaction section of the Form 4 filing.

How many CoastalSouth Bancshares shares does the COSO CEO own after this trade?

After the reported trade, Stephen R. Stone directly owns 120,385 CoastalSouth Bancshares common shares. In addition, he indirectly holds 4,830 common shares through an IRA, as reflected in the holding information in the Form 4 filing.

Was the COSO CEO’s Form 4 transaction a buy or a sell?

The Form 4 shows a buy transaction by the COSO CEO. It records an open-market purchase of 200 shares of CoastalSouth Bancshares common stock, with no reported sales in this filing and a net-buy direction overall.

Does the COSO CEO hold any CoastalSouth Bancshares shares indirectly?

Yes. Besides his direct holdings, the COSO CEO indirectly holds 4,830 CoastalSouth Bancshares common shares. These shares are reported as held “By IRA”, indicating indirect ownership through an individual retirement account on the Form 4.