Latham Group, Inc. Schedule 13G/A amendment reports that Wynnchurch-related entities and named partners filed updated beneficial ownership information for Common Stock (CUSIP 51819L107). The filing states that shares are no longer held directly by the listed Wynnchurch funds and that each Reporting Person reports ownership of 5 percent or less of a class.
The filing lists 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), their addresses, citizenships, and signed certifications dated 05/20/2026. A stockholders agreement with Pamplona Capital Partners V, L.P. is disclosed and each Reporting Person disclaims beneficial ownership of the Pamplona Fund's shares.
Positive
None.
Negative
None.
Insights
Wynnchurch clarifies ownership structure and group relationships.
The amendment documents that certain Wynnchurch funds no longer hold shares directly and explains adviser/general partner relationships among Wynnchurch Capital, L.P., the Wynnchurch funds, and the individual partners. This clarifies the chain of voting and dispositive power recorded as 0.00 in the cover rows.
The filing also discloses a Stockholders Agreement dated April 27, 2021 with Pamplona Capital Partners V, L.P.; the Reporting Persons state they may be deemed a "group" under Rule 13d-3 but explicitly disclaim beneficial ownership of the Pamplona Fund's shares. Subsequent filings may provide further changes in reported positions.
Amendment updates cover-page ownership rows and relational disclosures.
The cover-page rows show 0.00 for sole and shared voting and dispositive power and 0% percent of class for each Reporting Person, reflecting that direct holdings have been moved or reattributed. The filing incorporates those cover-page rows by reference into Item 4.
Signatures dated 05/20/2026 complete the amendment. The document preserves customary disclaimers about beneficial ownership and group status under Rule 13d-3.
Key Figures
CUSIP:51819L107Reported percent of class:5 percent or lessVoting/dispositive power shown:0.00 (sole/shared)+2 more
5 metrics
CUSIP51819L107Latham Group Common Stock
Reported percent of class5 percent or lessItem 5 / Ownership statement in filing
Voting/dispositive power shown0.00 (sole/shared)Cover-page rows incorporated into Item 4
Cover date02/24/2026Header cover information
Signature dates05/20/2026Signatures of Reporting Persons
"Amendment No. 5 ) Latham Group, Inc. Common Stock"
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.
Rule 13d-3regulatory
"may be deemed, pursuant to Rule 13d-3 under the Act, to beneficially own"
Rule 13d-3 defines who is treated as the beneficial owner of a company’s shares for U.S. securities disclosure rules — essentially anyone who has the power to vote or direct how shares are voted, or the power to buy or sell them, even if they don’t hold the certificates. For investors this matters because crossing certain ownership thresholds triggers public filing and disclosure obligations and signals potential control or influence, much like having the keys to a car implies you can drive it even if it’s registered to someone else.
Stockholders Agreementlegal
"Stockholders Agreement, dated as April 27, 2021 (the "Stockholders Agreement")"
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)
51819L107
(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 Number(s):
51819L107
1
Names of Reporting Persons
WYNNCHURCH CAPITAL PARTNERS IV, 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
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
9
Aggregate Amount Beneficially Owned by Each Reporting Person
0.00
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 %
12
Type of Reporting Person (See Instructions)
PN
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 Number(s):
51819L107
1
Names of Reporting Persons
Wynnchurch Partners IV, 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
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
9
Aggregate Amount Beneficially Owned by Each Reporting Person
0.00
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 %
12
Type of Reporting Person (See Instructions)
PN
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 Number(s):
51819L107
1
Names of Reporting Persons
Wynnchurch Capital, 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
0.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
0.00
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 %
12
Type of Reporting Person (See Instructions)
PN
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 Number(s):
51819L107
1
Names of Reporting Persons
WC PARTNERS EXECUTIVE IV, 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
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
9
Aggregate Amount Beneficially Owned by Each Reporting Person
0.00
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 %
12
Type of Reporting Person (See Instructions)
PN
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 Number(s):
51819L107
1
Names of Reporting Persons
John A. Hatherly
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
0.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
0.00
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 %
12
Type of Reporting Person (See Instructions)
IN
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 Number(s):
51819L107
1
Names of Reporting Persons
Francis G. Hayes
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
0.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
0.00
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 %
12
Type of Reporting Person (See Instructions)
IN
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 Number(s):
51819L107
1
Names of Reporting Persons
Christopher Patrick OBrien
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
0.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
0.00
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 %
12
Type of Reporting Person (See Instructions)
IN
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 Number(s):
51819L107
1
Names of Reporting Persons
Gregory B. Gleason
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
0.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
0.00
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 %
12
Type of Reporting Person (See Instructions)
IN
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
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.:
51819L107
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.
What does SWIM Schedule 13G/A say about Wynnchurch's holdings?
The amendment states Reporting Persons each report ownership of 5 percent or less of Latham Group common stock. It also notes cover-page rows showing 0.00 voting and dispositive power for each listed Reporting Person.
Who are the Reporting Persons on the filing for SWIM?
Reporting Persons include 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, with a business address in Rosemont, Illinois.
When were the signatures provided on this Schedule 13G/A amendment?
The amendment is signed by the Reporting Persons with signature dates shown as 05/20/2026. The filing header includes a date line of 02/24/2026 associated with the cover information.
Does the filing disclose any agreements affecting voting or control?
Yes. The filing discloses a Stockholders Agreement dated April 27, 2021 between the Pamplona Fund and the Wynnchurch Funds, and states the Reporting Persons may be deemed a "group" under Rule 13d-3 while disclaiming beneficial ownership of the Pamplona Fund's shares.
