CoastalSouth (COSO) CFO exercises 13,000 RSUs with tax withholding, updates share ownership

Rhea-AI Filing Summary

CoastalSouth Bancshares CFO and COO Anthony P. Valduga reported compensation-related equity activity involving the company’s common stock. He exercised 13,000 restricted stock units, which converted into the same number of common shares on a one-for-one basis.

To cover tax obligations, 3,841 shares were disposed of through a tax-withholding transaction at $25.59 per share, rather than sold in the open market. Following these transactions, he directly holds 90,673 common shares and indirectly holds additional shares through a spouse IRA (2,500 shares) and a personal IRA (27,924 shares).

Insider Trade Summary

13,000 shares exercised/converted

Mixed 5 txns

Insider Valduga Anthony P.

Role CFO AND COO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	13,000	$0.00	--
Exercise	Common Stock	13,000	$0.00	--
Tax Withholding	Common Stock	3,841	$25.59	$98K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct, null); Common Stock — 94,514 shares (Direct, null); Common Stock — 27,924 shares (Indirect, By IRA)

Footnotes (1)

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Key Figures

RSUs exercised: 13,000 shares Tax-withholding shares: 3,841 shares Tax-withholding price: $25.59 per share +3 more

6 metrics

RSUs exercised 13,000 shares Restricted stock units converting one-for-one into common stock

Tax-withholding shares 3,841 shares Shares used to satisfy tax obligations

Tax-withholding price $25.59 per share Value applied to shares used for tax liability

Direct holdings after transaction 90,673 shares Common stock held directly by Valduga

Indirect holdings via spouse IRA 2,500 shares Common stock held through spouse IRA

Indirect holdings via IRA 27,924 shares Common stock held through Valduga’s IRA

Key Terms

Restricted Stock Units, tax-withholding disposition, derivative security

3 terms

Restricted Stock Units financial

"Restricted stock units ("RSU") convert into shares of the issuer's common stock"

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.

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^*

Valduga Anthony P.

(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)
	CFO AND COO

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		13,000	A	$0	94,514	D
Common Stock	04/27/2026		F		3,841	D	$25.59	90,673	D
Common Stock								27,924	I	By IRA
Common Stock								2,500	I	By spouse 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
Restricted Stock Units	(1)	04/27/2026		M			13,000	04/27/2026	04/27/2026	Common Stock	13,000	(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)

FAQ

What did COSO executive Anthony Valduga report in this Form 4 filing?

Anthony Valduga reported equity compensation activity. He exercised 13,000 restricted stock units into common stock and had 3,841 shares withheld to cover taxes, updating his direct and indirect ownership in CoastalSouth Bancshares.

How many CoastalSouth Bancshares (COSO) shares did Valduga acquire in this transaction?

He acquired 13,000 shares through the conversion of restricted stock units. These RSUs converted into common stock on a one-for-one basis, increasing his direct equity position before tax withholding reduced the net shares he retains.

Were any of Anthony Valduga’s COSO shares sold on the open market?

The filing shows no open-market sales. Instead, 3,841 shares were used in a tax-withholding disposition at $25.59 per share, meaning shares covered tax obligations rather than being sold voluntarily in the market.

How many COSO shares does Valduga own directly after these transactions?

After the reported RSU exercise and tax-withholding disposition, Anthony Valduga directly holds 90,673 shares of CoastalSouth Bancshares common stock, reflecting his updated personal ownership position in the company.

What indirect COSO holdings does Anthony Valduga report?

The filing lists 2,500 shares held indirectly through a spouse IRA and 27,924 shares held indirectly through his own IRA. These accounts are reported as indirect ownership interests in CoastalSouth Bancshares common stock.

What do the restricted stock units in this COSO filing represent?

The restricted stock units represent equity compensation that converts into common stock. According to the footnote, each RSU converts into one share of CoastalSouth Bancshares common stock, explaining the 13,000-share acquisition when the RSUs vested.