[SCHEDULE 13G] CoastalSouth Bancshares, Inc. SEC Filing

Rhea-AI Filing Summary

Patriot Financial-related entities and four named individuals filed a Schedule 13G reporting beneficial ownership of CoastalSouth Bancshares, Inc. (CUSIP 19058X207). The joint filers state aggregate shared voting and dispositive power of 719,211 shares, equal to 8.87% of the Voting Common Stock based on 8,106,892 shares outstanding as of June 30, 2025. Individual reporting entities show holdings ranging from 7,900 shares (0.10%) to 711,311 shares (8.77%). The filing notes these holdings existed at the time of the issuer's initial public offering on July 1, 2025, and that the reporting persons did not acquire shares in that offering nor since then. The submission includes a joint filing agreement executed September 16, 2025.

Positive

• Material ownership disclosed: Joint filing reports 719,211 shares (8.87%), providing clear transparency on a substantial stake.
• Schedule 13G (passive) filing: The use of Form 13G indicates the holders characterize the position as passive rather than activist.
• Joint filing agreement included: Exhibit filed documenting coordination among reporting persons for clarity and compliance.

Negative

• Concentrated stake: Combined ownership near 9% is large enough to matter in close shareholder votes or proxy contests.
• No acquisition timing in IPO: Filing states the reporting persons did not acquire shares in the IPO, but does not specify how or when holdings originated prior to the IPO disclosure.

Insights

Securities Analyst

TL;DR Patriot Financial and affiliated entities disclosed a passive stake near 9% in CoastalSouth Bancshares, providing transparency on concentrated ownership.

The filing is a Schedule 13G, indicating a passive reporting position rather than an active intent to influence control. Combined shared voting and dispositive power totals 719,211 shares (8.87%) based on the issuer's reported 8,106,892 shares outstanding as of June 30, 2025. Key entities include Patriot Financial Partners II Coastal SPV, LLC with 711,311 shared shares (8.77%) and Patriot Financial Manager entities holding smaller amounts. The filing clarifies no purchases occurred in the issuer's IPO on July 1, 2025, limiting questions about acquisition timing. For investors, the main implication is disclosure of a material passive stake that may affect shareholder vote outcomes if aligned with others, but the Schedule 13G status signals no declared activist intent.

Corporate Governance Expert

TL;DR A coordinated group of Patriot Financial entities and principals report collective ownership under 9%, disclosed via a joint Schedule 13G.

The joint filing and accompanying exhibit identify participating entities and four individuals as reporting persons, and the form classifies reporting persons with appropriate types (PN, OO, IA, IN). The joint filing agreement is included as Exhibit 1, which documents coordination for reporting purposes. From a governance perspective, the disclosure increases transparency about a concentrated ownership block that could influence corporate decisions if the position changes, although no control intent is asserted in this Schedule 13G.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

CoastalSouth Bancshares, Inc.

(Name of Issuer)

Voting Common Stock

(Title of Class of Securities)

19058X207

(CUSIP Number)

07/01/2025

(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)

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

Patriot Financial Partners II, L.P.

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 636,988.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 636,988.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

636,988.00

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)

7.86 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

Patriot Financial Partners II Coastal SPV, 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 711,311.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 711,311.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

711,311.00

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)

8.77 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

Patriot Financial Partners Parallel II, L.P.

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 74,323.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 74,323.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

74,323.00

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)

0.92 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

Patriot Financial Partners GP II, L.P.

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 711,311.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 711,311.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

711,311.00

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)

8.77 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

Patriot Financial Partners GP II, 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 711,311.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 711,311.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

711,311.00

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)

8.77 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

Patriot Financial Manager, L.P.

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 7,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,900.00

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)

0.10 %

12

Type of Reporting Person (See Instructions)

IA, PN

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

Patriot Financial Manager, 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 7,900.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 7,900.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

7,900.00

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)

0.10 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

W. Kirk Wycoff

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 719,211.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 719,211.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

719,211.00

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)

8.87 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

James J. Lynch

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 719,211.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 719,211.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

719,211.00

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)

8.87 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

IRA M. LUBERT

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 719,211.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 719,211.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

719,211.00

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)

8.87 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

CUSIP No. 19058X207

1

Names of Reporting Persons

JAMES F. DEUTSCH

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 719,211.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 719,211.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

719,211.00

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)

8.87 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: This calculation is based on 8,106,892 shares of Voting Common Stock of the Issuer outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 11, 2025.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CoastalSouth Bancshares, Inc.
(b)	Address of issuer's principal executive offices: 400 GALLERIA PKWY, Suite 1900 ATLANTA, GA, 30339
Item 2.
(a)	Name of person filing: Patriot Financial Partners II, L.P. Patriot Financial Partners II Coastal SPV, LLC Patriot Financial Partners Parallel II, L.P. Patriot Financial Partners GP II, L.P. Patriot Financial Partners GP II, LLC Patriot Financial Manager, L.P. Patriot Financial Manager, LLC W. Kirk Wycoff James J. Lynch Ira M. Lubert James F. Deutsch
(b)	Address or principal business office or, if none, residence: Four Radnor Corporate Center 100 Matsonford Road Suite 210 Radnor, Pennsylvania 19087
(c)	Citizenship: See appropriate cover page above.
(d)	Title of class of securities: Voting Common Stock
(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: See cover sheets above with respect to each of the reporting persons. The event requiring the filing by the reporting persons is the initial public offering of the Issuer which occurred on July 1, 2025. The reporting persons did not acquire any shares of voting common stock in the initial public offering and have not acquired any shares of voting common stock since the initial public offering was completed. The percentages do not reflect the effect of the issuance by the Issuer of shares of voting common stock in the initial public offering.
(b)	Percent of class: See cover sheets above with respect to each of the reporting persons.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: NA
	(ii) Shared power to vote or to direct the vote: See cover sheets above with respect to each of the reporting persons.
	(iii) Sole power to dispose or to direct the disposition of: NA
	(iv) Shared power to dispose or to direct the disposition of: See cover sheets above with respect to each of the reporting persons.
Item 5.	Ownership of 5 Percent or Less of a Class.
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.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(K), so indicate under Item 3(k) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. Patriot Financial Partners II, L.P. Patriot Financial Partners II Coastal SPV, LLC Patriot Financial Partners Parallel II, L.P. Patriot Financial Partners GP II, L.P. Patriot Financial Partners GP II, LLC Patriot Financial Manager, L.P. Patriot Financial Manager, LLC W. Kirk Wycoff James J. Lynch Ira M. Lubert James F. Deutsch
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

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.

Patriot Financial Partners II, L.P.

Signature:	/s/ W. Kirk Wycoff
Name/Title:	Member of Patriot Financial Partners GP II, LLC, the general partner of Patriot Financial Partners GP II, L.P., the general partner
Date:	09/16/2025

Patriot Financial Partners II Coastal SPV, LLC

Signature:	/s/ W. Kirk Wycoff
Name/Title:	Member of Patriot Financial Partners GP II, LLC, the general partner of Patriot Financial Partners GP II, L.P., the general partner
Date:	09/16/2025

Patriot Financial Partners Parallel II, L.P.

Signature:	/s/ W. Kirk Wycoff
Name/Title:	Member of Patriot Financial Partners GP II, LLC, the general partner of Patriot Financial Partners GP II, L.P., the general partner
Date:	09/16/2025

Patriot Financial Partners GP II, L.P.

Signature:	/s/ W. Kirk Wycoff
Name/Title:	Member of Patriot Financial Partners GP II, LLC., the general partner of Patriot Financial Partners GP II, L.P.
Date:	09/16/2025

Patriot Financial Partners GP II, LLC

Signature:	/s/ W. Kirk Wycoff
Name/Title:	Member
Date:	09/16/2025

Patriot Financial Manager, L.P.

Signature:	/s/ W. Kirk Wycoff
Name/Title:	Member of Patriot Financial Manager, LLC, the general partner of Patriot Financial Manager, L.P.
Date:	09/16/2025

Patriot Financial Manager, LLC

Signature:	/s/ W. Kirk Wycoff
Name/Title:	Member
Date:	09/16/2025

W. Kirk Wycoff

Signature:	/s/ W. Kirk Wycoff
Name/Title:	W. Kirk Wycoff
Date:	09/16/2025

James J. Lynch

Signature:	/s/ James J. Lynch
Name/Title:	James J. Lynch
Date:	09/16/2025

IRA M. LUBERT

Signature:	/s/ Ira M. Lubert
Name/Title:	Ira M. Lubert
Date:	09/16/2025

JAMES F. DEUTSCH

Signature:	/s/ James F. Deutsch
Name/Title:	James F. Deutsch
Date:	09/16/2025

Exhibit Information

The joint filing agreement dated as of September 16, 2025 by and among Patriot Financial Partners II, L.P., Patriot Financial Partners II Coastal SPV, LLC, Patriot Financial Partners Parallel II, L.P., Patriot Financial Partners GP II, L.P., Patriot Financial Partners GP II, LLC, Patriot Financial Manager, L.P., Patriot Financial Manager, LLC, W. Kirk Wycoff, James J. Lynch, Ira M. Lubert and James F. Deutsch is filed as Exhibit 1 hereto.

FAQ

What stake does Patriot Financial hold in CoastalSouth Bancshares (COSO)?

The joint filers report beneficial ownership of 719,211 shares, representing 8.87% of CoastalSouth's Voting Common Stock based on 8,106,892 shares outstanding as of June 30, 2025.

Is this Schedule 13G filing indicative of activist intentions for COSO?

No. The document is a Schedule 13G filing, which by form signifies the reporting persons characterize their position as passive rather than an active effort to influence control.

Did Patriot Financial acquire shares in CoastalSouth's IPO on July 1, 2025?

The filing states the reporting persons did not acquire any shares in the initial public offering and have not acquired shares since the IPO was completed.

Which Patriot entity holds the largest reported position?

Patriot Financial Partners II Coastal SPV, LLC is reported with 711,311 shared voting and dispositive shares, equal to 8.77% of the class.

When was the joint filing agreement executed?

The joint filing agreement among the reporting persons is dated and filed as an exhibit on September 16, 2025.