CoastalSouth Bancshares CAO exercises 4,000 RSUs

Lauren M. Hemby, Chief Accounting Officer of CoastalSouth Bancshares, Inc., exercised 4,000 Restricted Stock Units into an equal number of common shares on April 27, 2026.

Rhea-AI Filing Summary

Lauren M. Hemby, Chief Accounting Officer of CoastalSouth Bancshares, Inc., exercised 4,000 Restricted Stock Units into an equal number of common shares on April 27, 2026. To satisfy tax obligations, 1,181 shares of common stock were delivered at $25.59 per share. Following these transactions, Hemby directly holds 13,069 shares of common stock.

The company states that these transactions were not conducted under a Rule 10b5-1 trading plan.

Insider Trade Summary

4,000 shares exercised/converted

Exercise 3 txns

Insider Hemby Lauren M.

Role CHIEF ACCOUNTING OFFICER

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	4,000	$0.00	$0.00
Exercise	Common Stock	4,000	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	1,181	$25.59	$30K

Holdings After Transaction: Restricted Stock Units — 0 contracts (Direct); Common Stock — 13,069 shares (Direct)

Footnotes (1)

1. F1. Restricted stock units ("RSU") convert into shares of the issuer's common stock on a one-for-one basis.

Key Figures

RSUs exercised: 4,000 units Shares acquired from RSU conversion: 4,000 shares Shares delivered for taxes: 1,181 shares +2 more

5 metrics

RSUs exercised 4,000 units Restricted Stock Units converted into common stock on April 27, 2026

Shares acquired from RSU conversion 4,000 shares Common stock received upon RSU conversion

Shares delivered for taxes 1,181 shares Common shares delivered to satisfy tax obligations at vesting

Tax withholding price $25.59 per share Price used for tax-withholding share delivery

Post-transaction holdings 13,069 shares Direct common stock held after April 27, 2026 transactions

Key Terms

Restricted Stock Units, tax-withholding disposition, derivative security

3 terms

Restricted Stock Units financial

"Restricted Stock Units convert into shares of common stock on a one-for-one basis"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax-withholding disposition financial

"Payment of exercise price or tax liability by delivering securities"

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

derivative security financial

"Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

FAQ

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

What insider transaction did CoastalSouth Bancshares (COSO) report for Lauren M. Hemby?

CoastalSouth Bancshares (COSO) reported that Lauren M. Hemby, its Chief Accounting Officer, exercised 4,000 Restricted Stock Units, receiving an equal number of common shares. This RSU conversion occurred on April 27, 2026, as part of her equity compensation.

How many CoastalSouth Bancshares (COSO) shares were withheld for taxes in this Form 4?

In the reported transactions, 1,181 common shares of CoastalSouth Bancshares (COSO) were delivered to cover tax obligations at $25.59 per share. This tax-withholding disposition followed the vesting and conversion of 4,000 RSUs into common stock.

What are Lauren M. Hembys holdings in CoastalSouth Bancshares (COSO) after these transactions?

After the April 27, 2026 equity transactions, Lauren M. Hemby directly holds 13,069 shares of CoastalSouth Bancshares (COSO) common stock. This post-transaction balance reflects the RSU conversion and related tax-withholding share delivery.

Were Lauren M. Hembys CoastalSouth Bancshares (COSO) trades under a Rule 10b5-1 plan?

The disclosure indicates these transactions were not conducted under a Rule 10b5-1 trading plan. This means the equity award vesting and tax-withholding share delivery were not made pursuant to a pre-arranged trading program.

What type of equity award did CoastalSouth Bancshares (COSO) use in Lauren M. Hembys Form 4?

The transaction involves Restricted Stock Units (RSUs), which convert into CoastalSouth Bancshares (COSO) common stock on a one-for-one basis. On April 27, 2026, 4,000 RSUs converted into 4,000 common shares as part of her compensation.

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

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Accepted by SEC EDGAR 04/29/2026 - 04:15 PM 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^*

Hemby Lauren M.

(Last) (First) (Middle)

400 GALLERIA PARKWAY

SUITE 1900

(Street)

ATLANTA GEORGIA 30339

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/27/2026

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	04/27/2026		M		4,000	A	$0	14,250	D
Common Stock	04/27/2026		F		1,181	D	$25.59	13,069	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
Restricted Stock Units	(1)	04/27/2026		M			4,000	04/27/2026	04/27/2026	Common Stock	4,000	(1)	0	D

Explanation of Responses:

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

	/s/ Lauren Hemby, Chief Accouting Officer	04/29/2026
	** 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)