CoastalSouth Bancshares (COSO) director sells 1,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

CoastalSouth Bancshares, Inc. director Ernst W. Bruderer reported a sale of 1,000 shares of Common Stock on August 12, 2026. The transaction was a sale in open market or private transaction at $27.5644 per share, made pursuant to a Rule 10b5‑1 trading plan, leaving him with 46,131 shares held directly.

Insider Trade Summary 10b5-1

Net Seller: 1,000 shares

Net Sell 1 txn

Insider Bruderer Ernst W.

Role Director

Sold 1,000 shs ($28K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,000	$27.5644	$28K

Holdings After Transaction: Common Stock — 46,131 shares (Direct)

Key Figures

Shares sold: 1,000 shares Sale price per share: $27.5644 per share Shares held after transaction: 46,131 shares

3 metrics

Shares sold 1,000 shares Non-derivative Common Stock sale on August 12, 2026

Sale price per share $27.5644 per share Price for the 1,000-share Common Stock sale

Shares held after transaction 46,131 shares Total Common Stock directly owned by Ernst W. Bruderer after the sale

Key Terms

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

3 terms

Common Stock financial

"The transaction involved Common Stock in a non-derivative sale."

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

"The transaction was classified as non-derivative Common Stock."

open market or private transaction financial

"The sale was a sale in open market or private transaction."

FAQ

What insider transaction did CoastalSouth Bancshares (COSO) disclose?

CoastalSouth Bancshares disclosed that director Ernst W. Bruderer sold 1,000 shares of Common Stock on August 12, 2026. The sale was reported as a sale in open market or private transaction under a Rule 10b5‑1 trading plan.

How many CoastalSouth Bancshares (COSO) shares did the director sell and at what price?

Director Ernst W. Bruderer sold 1,000 shares of CoastalSouth Bancshares Common Stock at $27.5644 per share. The transaction code indicates a sale in open market or private transaction rather than an option exercise or gift.

How many CoastalSouth Bancshares (COSO) shares does the insider hold after the sale?

After the reported sale, Ernst W. Bruderer directly holds 46,131 shares of CoastalSouth Bancshares Common Stock. This figure is the total shares following the transaction as disclosed, reflecting his remaining direct ownership position.

Was the CoastalSouth Bancshares (COSO) insider trade under a Rule 10b5-1 plan?

Yes. The filing indicates the transactions were made under a Rule 10b5‑1 trading plan. Such plans pre-arrange trades, so the timing of this 1,000-share sale is based on the plan’s terms rather than discretionary market timing.

What role does the reporting person hold at CoastalSouth Bancshares (COSO)?

The reporting person, Ernst W. Bruderer, is identified as a director of CoastalSouth Bancshares, Inc. He is not listed as an officer or 10% owner, so the reported sale reflects activity in his director-level insider holdings.

What type of security did the CoastalSouth Bancshares (COSO) insider trade involve?

The transaction involved Common Stock of CoastalSouth Bancshares, Inc. It was reported as a non-derivative transaction, meaning no options or other derivative securities were exercised or converted in connection with this 1,000‑share sale.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/13/2026 - 05:01 PM Accepted by SEC EDGAR 08/13/2026 - 05:00 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).

X

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)
08/12/2026

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	08/12/2026		S		1,000	D	$27.5644	46,131	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	08/13/2026
	** 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.
* Form 4: SEC 1474 (03-26)