CoastalSouth Bancshares (COSO) director sells 1,000 shares

Rhea-AI Filing Summary

CoastalSouth Bancshares, Inc. (COSO) director Ernst W. Bruderer reported selling 1,000 shares of Common Stock on 2026-08-18 in an open-market or private transaction at $27.8895 per share. After this sale, he directly holds 45,131 shares of CoastalSouth Bancshares Common Stock. The filing indicates the Rule 10b5-1 trading-plan checkbox was not marked.

Insider Trade Summary

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	$27.8895	$28K

Holdings After Transaction: Common Stock — 45,131 shares (Direct)

Key Figures

Shares sold: 1,000 shares Sale price per share: $27.8895 per share Shares held after transaction: 45,131 shares +1 more

4 metrics

Shares sold 1,000 shares Common Stock sale reported on 2026-08-18

Sale price per share $27.8895 per share Price for the 1,000-share Common Stock sale

Shares held after transaction 45,131 shares Director’s direct Common Stock holdings following the sale

Net buy/sell shares 1,000 shares Net-sell activity in this Form 4

Key Terms

Common Stock, open market or private transaction, Rule 10b5-1

3 terms

Common Stock financial

"security_title: "Common Stock""

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.

open market or private transaction financial

"transaction_code_description: "Sale in open market or private transaction""

Rule 10b5-1 regulatory

"aff_10b5_one: false indicates Rule 10b5-1 checkbox not checked"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

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

Ernst W. Bruderer reported selling 1,000 shares of CoastalSouth Bancshares Common Stock on 2026-08-18. The sale was reported as an open-market or private transaction at $27.8895 per share, reducing but not eliminating his direct share ownership.

How many CoastalSouth Bancshares (COSO) shares does Ernst W. Bruderer hold after the sale?

After the reported sale, Ernst W. Bruderer directly holds 45,131 COSO shares. This figure reflects his position following the 1,000-share disposition on 2026-08-18 and represents his remaining reported direct ownership stake in CoastalSouth Bancshares Common Stock.

At what price were the 1,000 COSO shares sold by Ernst W. Bruderer?

The 1,000 CoastalSouth Bancshares shares were sold at a price of $27.8895 per share. This price is reported as a per-share transaction value for the non-derivative Common Stock sale occurring on 2026-08-18 in an open-market or private transaction.

Was Ernst W. Bruderer’s COSO stock sale under a Rule 10b5-1 trading plan?

The filing shows the Rule 10b5-1 checkbox as not checked, indicating the sale was not affirmed as made under a Rule 10b5-1 trading plan. No footnotes in the report describe any separate pre-arranged trading arrangement.

How many COSO shares in total did Ernst W. Bruderer sell in this Form 4 filing?

This Form 4 reports that Ernst W. Bruderer sold 1,000 shares of CoastalSouth Bancshares Common Stock. The transaction summary characterizes activity as a single net-sell event of 1,000 shares, with no reported purchases, exercises, or gifts in this filing.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 04:16 PM Accepted by SEC EDGAR 08/18/2026 - 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^*

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)
08/18/2026

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	08/18/2026		S		1,000	D	$27.8895	45,131	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	08/18/2026
	** 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)