X0202 SCHEDULE 13G/A 0000897069-22-000111 0001620062 XXXXXXXX LIVE 5 Common Stock 02/24/2026 0001833197 Latham Group, Inc. 51819L107 787 Watervliet Shaker Road Latham NY 12110 Rule 13d-1(d) WYNNCHURCH CAPITAL PARTNERS IV, L.P. b E9 0 0 0 0 0 N 0 PN 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. Wynnchurch Partners IV, L.P. b E9 0 0 0 0 0 N 0 PN 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. Wynnchurch Capital, L.P. b DE 0 0 0 0 0 N 0 PN 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. WC PARTNERS EXECUTIVE IV, L.P. b E9 0 0 0 0 0 N 0 PN 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. John A. Hatherly b X1 0 0 0 0 0 N 0 IN 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. Francis G. Hayes b X1 0 0 0 0 0 N 0 IN 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. Christopher Patrick OBrien b X1 0 0 0 0 0 N 0 IN 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. Gregory B. Gleason b X1 0 0 0 0 0 N 0 IN 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. Latham Group, Inc. 787 Watervliet Shaker Road, Latham, New York, 12110 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. The business address of the Reporting Persons is 6250 N. River Road, Suite 10-100, Rosemont, IL 60018. 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. Y 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. 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. 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. 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. 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. 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. N Y Y Y N 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. Y Y https://www.sec.gov/Archives/edgar/data/1620062/000089706922000111/cmw382a.htm WYNNCHURCH CAPITAL PARTNERS IV, L.P. /s/ Christopher P. O'Brien 05/20/2026 Wynnchurch Partners IV, L.P. /s/ Christopher P. O'Brien 05/20/2026 Wynnchurch Capital, L.P. /s/ Christopher P. O'Brien 05/20/2026 WC PARTNERS EXECUTIVE IV, L.P. /s/ Christopher P. O'Brien 05/20/2026 John A. Hatherly /s/ John A. Hatherly 05/20/2026 Francis G. Hayes /s/ Francis G. Hayes 05/20/2026 Christopher Patrick OBrien Christopher Patrick O'Brien 05/20/2026 Gregory B. Gleason /s/ Gregory B. Gleason 05/20/2026