CoastalSouth director sells 2,000 shares

CoastalSouth Bancshares, Inc. (COSO) director Ernst W. Bruderer reported selling 2,000 shares of Common Stock on 2026-08-26 in a transaction coded as a sale in the open market or a private transaction.

Rhea-AI Filing Summary

CoastalSouth Bancshares, Inc. (COSO) director Ernst W. Bruderer reported selling 2,000 shares of Common Stock on 2026-08-26 in a transaction coded as a sale in the open market or a private transaction. The reported sale price was $27.5018 per share, leaving him with 43,131 shares of directly held common stock following the transaction.

Insider Trade Summary

Net Seller: 2,000 shares

Net Sell 1 txn

Insider Bruderer Ernst W.

Role Director

Sold 2,000 shs ($55K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,000	$27.5018	$55K

Holdings After Transaction: Common Stock — 43,131 shares (Direct)

Key Figures

Shares sold: 2,000 shares of Common Stock Sale price per share: $27.5018 per share Shares owned after transaction: 43,131 shares of Common Stock

3 metrics

Shares sold 2,000 shares of Common Stock Non-derivative sale on 2026-08-26

Sale price per share $27.5018 per share Reported price for the 2,000-share sale on 2026-08-26

Shares owned after transaction 43,131 shares of Common Stock Direct ownership following the reported sale

Key Terms

Form 4, Common Stock, non-derivative, open market or private transaction

4 terms

Form 4 regulatory

"insider transaction did COSO director Ernst W. Bruderer report?"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Common Stock financial

"reported selling 2,000 shares of Common Stock on 2026-08-26"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

non-derivative financial

"categorized as a non-derivative security"

open market or private transaction financial

"coded as a sale in the open market or a private transaction"

FAQ

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

What insider transaction did COSO director Ernst W. Bruderer report?

Ernst W. Bruderer reported a sale of 2,000 COSO common shares on 2026-08-26 in a transaction coded as a sale in the open market or a private transaction, at a reported price of $27.5018 per share.

How many COSO shares did Ernst W. Bruderer sell and at what price?

He sold 2,000 shares of CoastalSouth Bancshares, Inc. common stock at a reported price of $27.5018 per share on 2026-08-26.

How many COSO shares does Ernst W. Bruderer hold after this reported sale?

Following the reported transaction, Ernst W. Bruderer is shown as directly holding 43,131 shares of CoastalSouth Bancshares, Inc. common stock.

What type of security did Ernst W. Bruderer trade in this COSO Form 4?

The Form 4 reports a transaction in Common Stock of CoastalSouth Bancshares, Inc., categorized as a non-derivative security.

Was the 2026-08-26 COSO insider transaction a purchase or a sale?

The 2026-08-26 insider transaction reported by Ernst W. Bruderer was a sale of 2,000 shares, indicated by transaction code “S” and a disposition code “D.”

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

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Available on EDGAR 08/26/2026 - 04:54 PM EDT Accepted by SEC EDGAR 08/26/2026 - 04:54 PM EDT 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^*

Bruderer Ernst W.

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/26/2026

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	08/26/2026		S		2,000	D	$27.5018	43,131	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

Explanation of Responses:

	/s/ Lauren Hemby, Chief Accouting Officer	08/26/2026
	** 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)