Form SCHEDULE 13G/A Latham Group, Inc. Filed by: WYNNCHURCH CAPITAL PARTNERS IV, L.P.

May 20, 2026 10:06 AM

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)*

Latham Group, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

(CUSIP Number)

02/24/2026

(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 No.

Names of Reporting Persons

WYNNCHURCH CAPITAL PARTNERS IV, L.P.

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

(a)
(b)

Sec Use Only

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person: Shares of Common Stock are no longer held directly by Wynnchurch Capital Partners IV, L.P. Wynnchurch Partners IV, L.P. is the general partner of Wynnchurch Capital Partners IV, L.P. Wynnchurch Capital, L.P. is the investment adviser to Wynnchurch Capital Partners IV, L.P. Wynnchurch Capital, L.P. is principally owned and controlled by Christopher P. O'Brien, Gregory B. Gleason, John A. Hatherly and Francis G. Hayes.

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

Wynnchurch Partners IV, L.P.

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

(a)
(b)

Sec Use Only

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person: Shares of Common Stock are no longer held directly by WC Partners Executive IV, L.P. and Wynnchurch Capital Partners IV, L.P. Wynnchurch Partners IV, L.P. is the general partner of WC Partners Executive IV, L.P. and Wynnchurch Capital Partners IV, L.P. Wynnchurch Capital, L.P. is the investment adviser to WC Partners Executive IV, L.P. and Wynnchurch Capital Partners IV, L.P. Wynnchurch Capital, L.P. is principally owned and controlled by Christopher P. O'Brien, Gregory B. Gleason, John A. Hatherly and Francis G. Hayes.

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

Wynnchurch Capital, L.P.

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

(a)
(b)

Sec Use Only

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

WC PARTNERS EXECUTIVE IV, L.P.

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

(a)
(b)

Sec Use Only

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person: Shares of Common Stock rare no longer held directly by WC Partners Executive IV, L.P. Wynnchurch Partners IV, L.P. is the general partner of WC Partners Executive IV, L.P. Wynnchurch Capital, L.P. is the investment adviser to WC Partners Executive IV, L.P. Wynnchurch Capital, L.P. is principally owned and controlled by Christopher P. O'Brien, Gregory B. Gleason, John A. Hatherly and Francis G. Hayes.

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

John A. Hatherly

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

(a)
(b)

Sec Use Only

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

Francis G. Hayes

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

(a)
(b)

Sec Use Only

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

Christopher Patrick OBrien

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

(a)
(b)

Sec Use Only

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP No.

Names of Reporting Persons

Gregory B. Gleason

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

(a)
(b)

Sec Use Only

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 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

Latham Group, Inc.

(b)

Address of issuer's principal executive offices:

787 Watervliet Shaker Road, Latham, New York, 12110

Item 2.

(a)

Name of person filing:

The persons filing this Schedule 13G are (the "Reporting Persons"): Wynnchurch Partners IV, L.P.; Wynnchurch Capital, L.P.; WC Partners Executive IV, L.P.; Wynnchurch Capital Partners IV, L.P.; Christopher P. O'Brien; Gregory B. Gleason; John A. Hatherly; and Francis G. Hayes.

(b)

Address or principal business office or, if none, residence:

The business address of the Reporting Persons is 6250 N. River Road, Suite 10-100, Rosemont, IL 60018.

(c)

Citizenship:

Wynnchurch Partners IV, L.P., WC Partners Executive IV, L.P., Wynnchurch Capital Partners IV, L.P. are Cayman Islands partnerships. Wynnchurch Capital, L.P. is a Delaware partnership. Christopher P. O'Brien, Gregory B. Gleason, John A. Hatherly, and Francis G. Hayes are United States citizens.

(d)

Title of class of securities:

Common Stock

(e)

CUSIP No.:

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:

The information required by Items 4(a) - (c) is set forth in Rows 5 through 11 of the cover page for each Reporting Person and incorporated herein by reference for each such Reporting Person. Shares of Common Stock are no longer held directly by Wynnchurch Capital Partners IV, L.P. Wynnchurch Partners IV, L.P. is the general partner of Wynnchurch Capital Partners IV, L.P. Wynnchurch Capital, L.P. is the investment adviser to Wynnchurch Capital Partners IV, L.P. Wynnchurch Capital, L.P. is principally owned and controlled by Christopher P. O'Brien, Gregory B. Gleason, John A. Hatherly, and Francis G. Hayes.

(b)

Percent of class:

The information required by Items 4(a) - (c) is set forth in Rows 5 through 11 of the cover page for each Reporting Person and incorporated herein by reference for each such Reporting Person. %

(c)

Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote:

The information required by Items 4(a) - (c) is set forth in Rows 5 through 11 of the cover page for each Reporting Person and incorporated herein by reference for each such Reporting Person.

(ii) Shared power to vote or to direct the vote:

The information required by Items 4(a) - (c) is set forth in Rows 5 through 11 of the cover page for each Reporting Person and incorporated herein by reference for each such Reporting Person.

(iii) Sole power to dispose or to direct the disposition of:

The information required by Items 4(a) - (c) is set forth in Rows 5 through 11 of the cover page for each Reporting Person and incorporated herein by reference for each such Reporting Person.

(iv) Shared power to dispose or to direct the disposition of:

The information required by Items 4(a) - (c) is set forth in Rows 5 through 11 of the cover page for each Reporting Person and incorporated herein by reference for each such Reporting Person.

Item 5.

Ownership of 5 Percent or Less of a Class.

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)(J), so indicate under Item 3(j) 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.

Pamplona Capital Partners V, L. P. (the "Pamplona Fund") entered into a stockholders agreement, dated as April 27, 2021 (the "Stockholders Agreement"), with Wynnchurch Capital Partners IV, L.P. and WC Partners Executive IV, L.P. (collectively, the "Wynnchurch Funds"). Pursuant to the Stockholders Agreement, each of the Pamplona Fund and the Wynnchurch Funds have agreed, among other things, to vote their shares of Common Stock to elect members of the board of directors of the Issuer as set forth therein. Because of the relationship between the Pamplona Fund and the Wynnchurch Funds as a result of the Stockholders Agreement, the Reporting Persons may be deemed, pursuant to Rule 13d-3 under the Act, to beneficially own the shares of Common Stock beneficially owned by the Wynnchurch Funds and/or to constitute a "group" with the Wynnchurch Funds. Each Reporting Person disclaims beneficial ownership of the shares of Common Stock beneficially owned by the Pamplona Fund.

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.

WYNNCHURCH CAPITAL PARTNERS IV, L.P.

Signature:	/s/ Christopher P. O'Brien
Name/Title:	WYNNCHURCH CAPITAL PARTNERS IV, L.P.
Date:	05/20/2026

Wynnchurch Partners IV, L.P.

Signature:	/s/ Christopher P. O'Brien
Name/Title:	Wynnchurch Partners IV, L.P.
Date:	05/20/2026

Wynnchurch Capital, L.P.

Signature:	/s/ Christopher P. O'Brien
Name/Title:	Wynnchurch Capital, L.P.
Date:	05/20/2026

WC PARTNERS EXECUTIVE IV, L.P.

Signature:	/s/ Christopher P. O'Brien
Name/Title:	WC PARTNERS EXECUTIVE IV, L.P.
Date:	05/20/2026

John A. Hatherly

Signature:	/s/ John A. Hatherly
Name/Title:	John A. Hatherly
Date:	05/20/2026

Francis G. Hayes

Signature:	/s/ Francis G. Hayes
Name/Title:	Francis G. Hayes
Date:	05/20/2026

Christopher Patrick OBrien

Signature:	Christopher Patrick O'Brien
Name/Title:	Christopher Patrick O'Brien
Date:	05/20/2026

Gregory B. Gleason

Signature:	/s/ Gregory B. Gleason
Name/Title:	Gregory B. Gleason
Date:	05/20/2026

Exhibit Information

https://www.sec.gov/Archives/edgar/data/1620062/000089706922000111/cmw382a.htm

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Form SCHEDULE 13G/A Latham Group, Inc. Filed by: WYNNCHURCH CAPITAL PARTNERS IV, L.P.

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