Fourthstone Reports 9.18% Stake in CoastalSouth

CoastalSouth Bancshares, Inc. ownership update: Fourthstone LLC and related entities report beneficial ownership of common stock, including 1,100,504 shares (9.18%) held by Fourthstone LLC based on 11,985,414 shares outstanding as of March 5, 2026.

Rhea-AI Filing Summary

CoastalSouth Bancshares, Inc. ownership update: Fourthstone LLC and related entities report beneficial ownership of common stock, including 1,100,504 shares (9.18%) held by Fourthstone LLC based on 11,985,414 shares outstanding as of March 5, 2026.

The amendment attributes additional holdings to affiliated funds and entities: Fourthstone Master Opportunity Fund Ltd: 849,889 shares (7.09%), Fourthstone GP LLC: 250,615 shares (2.09%), and other affiliated vehicles. The filing states these shares were acquired in the ordinary course as an investment adviser and are not held to influence control.

Insights

Securities Ownership Analyst

Holds concentrated passive stake just under single‑digit control thresholds.

The filing shows Fourthstone LLC beneficially holds 1,100,504 shares (9.18%) of common stock, using the issuer's outstanding share base of 11,985,414 as of March 5, 2026. The position is reported across related entities and individuals with shared voting and dispositive power.

These holdings are described as acquired in the ordinary course by an investment adviser and are stated not to be for influence of control; cash‑flow treatment and any planned dispositions are not included in the excerpt.

Corporate Governance Specialist

Disclosure clarifies attribution and voting/dispositive arrangements among affiliates.

The amendment details shared voting and dispositive power for multiple Fourthstone entities and names L. Phillip Stone, IV and Fourthstone GP LLC as related reporting persons. Percentages are calculated from the issuer's Form 10‑K share count.

Because the filing expressly states the holdings are not intended to change control, governance impact depends on future transactions or additional disclosures in subsequent filings.

Key Figures

Shares outstanding: 11,985,414 shares Fourthstone LLC holdings: 1,100,504 shares Fourthstone LLC percent: 9.18% +2 more

5 metrics

Shares outstanding 11,985,414 shares Outstanding common shares as of March 5, 2026

Fourthstone LLC holdings 1,100,504 shares Beneficially owned by Fourthstone LLC

Fourthstone LLC percent 9.18% Percent of class based on March 5, 2026 outstanding shares

Fourthstone Master Opportunity Fund Ltd holdings 849,889 shares Beneficially owned by Fourthstone Master Opportunity Fund Ltd

Fourthstone GP LLC holdings 250,615 shares Beneficially owned by Fourthstone GP LLC

Key Terms

Schedule 13G/A, Beneficially owned, Shared Dispositive Power

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 and cover pages reporting beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Beneficially owned financial

"Item 4: Amount beneficially owned: Fourthstone LLC acquired the Issuer's shares"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Shared Dispositive Power regulatory

"cover pages list Shared Dispositive Power 1,100,504.00 for Fourthstone LLC"

FAQ

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

What stake does Fourthstone report in CoastalSouth (COSO)?

Fourthstone LLC reports beneficial ownership of 1,100,504 shares (9.18%). The percentage is based on 11,985,414 shares outstanding as of March 5, 2026, per the issuer's Form 10‑K referenced in the amendment.

Which affiliated Fourthstone entities are listed in the COSO filing?

The filing lists Fourthstone LLC, Fourthstone Master Opportunity Fund Ltd, Fourthstone GP LLC, Fourthstone QP Opportunity Fund, and Fourthstone Small‑Cap Financials Fund. Each entity's share count and percent of class are reported on the cover pages.

Does the filing say Fourthstone intends to influence control of COSO?

No. The reporting persons certify the shares were acquired in the ordinary course and are not held to change or influence control of the issuer, as stated in Item 2 of the amendment.

What voting and dispositive powers does Fourthstone report for COSO shares?

The amendment reports shared voting and shared dispositive power for the listed holdings (e.g., Fourthstone LLC shows 1,100,504 shared voting and dispositive), with specific per‑entity breakdowns on the cover pages.

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

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Accepted by SEC EDGAR 05/15/2026 - 04:52 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

CoastalSouth Bancshares, Inc.

(Name of Issuer)

Common Stock, par value $1.00 per share

(Title of Class of Securities)

19058X207

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 19058X207

1

Names of Reporting Persons

Fourthstone LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,100,504.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,100,504.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,100,504.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

9.18 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 19058X207

1

Names of Reporting Persons

Fourthstone Master Opportunity Fund Ltd

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 849,889.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 849,889.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

849,889.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

7.09 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 19058X207

1

Names of Reporting Persons

Fourthstone GP LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 250,615.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 250,615.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

250,615.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

2.09 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 19058X207

1

Names of Reporting Persons

Fourthstone QP Opportunity Fund LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 235,512.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 235,512.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

235,512.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.96 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 19058X207

1

Names of Reporting Persons

Fourthstone Small-Cap Financials Fund LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 15,103.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 15,103.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

15,103.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.13 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 19058X207

1

Names of Reporting Persons

L. Phillip Stone, IV

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,100,504.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,100,504.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,100,504.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

9.18 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CoastalSouth Bancshares, Inc.
(b)	Address of issuer's principal executive offices: 400 Galleria Parkway Suite 1900 Atlanta, Georgia 30339
Item 2.
(a)	Name of person filing: This Schedule 13G is being filed by Fourthstone LLC, a Delaware Limited Liability Company and Investment Adviser ("Fourthstone"). The persons reporting information on this Schedule 13G include, in addition to Fourthstone, a company incorporated in the Cayman Islands ("Fourthstone Master Opportunity Fund"), a Delaware Limited Partnership ("Fourthstone QP Opportunity"), a Delaware Limited Partnership ("Fourthstone Small-Cap Financials"), a Delaware Limited Liability Company ("Fourthstone GP, " General Partner of Fourthstone QP Opportunity and Fourthstone Small-Cap Financials), and L. Phillip Stone, IV, a citizen of the United States of America, who is the Managing Member of Fourthstone and Fourthstone GP (each, a "Reporting Person" and, together, the "Reporting Persons"). Fourthstone directly holds 1,100,504 shares of Common Stock on behalf of its advisory clients. Each of the Reporting Persons listed in this filing certify the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the Issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that effect.
(b)	Address or principal business office or, if none, residence: The principal business address of each of the Reporting Persons is as follows: The registered office of Fourthstone LLC, Fourthstone Master Opportunity Fund Ltd., Fourthstone GP LLC, Fourthstone QP Opportunity Fund LP, Fourthstone Small-Cap Financials Fund LP is 575 Maryville Centre Drive, Suite 110, St. Louis, MO 63141.
(c)	Citizenship: See response to Item 4 of each of the cover pages.
(d)	Title of class of securities: Common Stock, par value $1.00 per share
(e)	CUSIP No.: 19058X207
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: Fourthstone LLC acquired the Issuer's shares in the ordinary course of business as a registered investment adviser and not with the purpose nor with the effect of influencing the control of the Issuer. Fourthstone GP LLC is the general partner of and may be deemed to beneficially own securities owned by Fourthstone QP Opportunity Fund LP and Fourthstone Small-Cap Financials Fund LP. L. Phillip Stone, IV, is the Managing Member of Fourthstone LLC and Fourthstone GP and may be deemed to beneficially own securities owned by Fourthstone. The percentages reported in Row 11 of each cover page are based on 11,985,414 shares of Common Stock (as defined below) of the Issuer (as defined below) outstanding as of March 5, 2026, based on the Issuer's Form 10-K filed on March 12, 2026.
(b)	Percent of class: 9.18 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See responses to Item 5 on each cover page.
	(ii) Shared power to vote or to direct the vote: See responses to Item 6 on each cover page.
	(iii) Sole power to dispose or to direct the disposition of: See responses to Item 7 on each cover page.
	(iv) Shared power to dispose or to direct the disposition of: See responses to Item 8 on each cover page.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Fourthstone LLC

Signature:	Amy M. Stone
Name/Title:	Chief Executive Officer
Date:	05/15/2026

Fourthstone Master Opportunity Fund Ltd

Signature:	Amy M. Stone
Name/Title:	Chief Executive Officer
Date:	05/15/2026

Fourthstone GP LLC

Signature:	L. Phillip Stone, IV
Name/Title:	Managing Member of Fourthstone GP LLC
Date:	05/15/2026

Fourthstone QP Opportunity Fund LP

Signature:	Amy M. Stone
Name/Title:	Chief Executive Officer
Date:	05/15/2026

Fourthstone Small-Cap Financials Fund LP

Signature:	Amy M. Stone
Name/Title:	Chief Executive Officer
Date:	05/15/2026

L. Phillip Stone, IV

Signature:	L. Phillip Stone, IV
Name/Title:	Self, Principal owner of Fourthstone LLC
Date:	05/15/2026