Director at CoastalSouth (COSO) granted 868 RSUs vesting in 2026

Rhea-AI Filing Summary

CoastalSouth Bancshares director Michael B. High received a grant of 868 restricted stock units on 02/11/2026. These RSUs are a form of stock-based compensation that can convert into common shares.

The RSUs convert into shares of common stock on a one-for-one basis and are scheduled to vest 100% on 12/31/2026. After this award, High beneficially owns 868 derivative securities directly in the form of these RSUs.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider HIGH MICHAEL B

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit	868	$0.00	--

Holdings After Transaction: Restricted Stock Unit — 868 shares (Direct)

Footnotes (1)

1. Restricted stock units ("RSU") convert into shares of the issuer's common stock on a one-for-one basis. RSU 100% vests on 12/31/2026.

Form 4 Insider Transactions: What Each Field Means →

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^*

HIGH MICHAEL B

(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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
02/11/2026

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

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 Unit	(1)	02/11/2026		A		868		12/31/2026(2)	12/31/2026(2)	Common Stock	868	(1)	868	D

Explanation of Responses:

1. Restricted stock units ("RSU") convert into shares of the issuer's common stock on a one-for-one basis.

2. RSU 100% vests on 12/31/2026.

	/s/ Lauren Hemby, Chief Accouting Officer	02/13/2026
	** 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 CoastalSouth Bancshares (COSO) report for Michael B. High?

CoastalSouth Bancshares reported that director Michael B. High received 868 restricted stock units on 02/11/2026. This is a stock-based award, not an open-market share purchase or sale, and represents additional equity-linked compensation.

How many restricted stock units were granted to the CoastalSouth (COSO) director?

The director received an award of 868 restricted stock units. Each RSU represents the right to receive one share of CoastalSouth Bancshares common stock, subject to the vesting conditions described in the filing.

When do Michael B. High’s RSUs at CoastalSouth (COSO) vest?

The restricted stock units are scheduled to vest 100% on 12/31/2026. Vesting means the units become earned, allowing them to convert into shares of common stock on the one-for-one basis described.

What is the conversion ratio for the CoastalSouth (COSO) restricted stock units?

Each restricted stock unit converts into one share of CoastalSouth Bancshares common stock. This one-for-one conversion occurs after the vesting conditions are satisfied, aligning the director’s compensation with future share value.

Is the CoastalSouth (COSO) Form 4 transaction a stock purchase or sale?

The Form 4 reports an acquisition of 868 restricted stock units as a grant or award, not a market purchase or sale. The transaction code is “A,” indicating a compensatory grant rather than open-market trading activity.

How many derivative securities does the CoastalSouth (COSO) director own after this RSU grant?

Following the grant, the director beneficially owns 868 derivative securities in the form of restricted stock units. These are held directly and represent potential future shares, subject to the vesting date of 12/31/2026.