Latham Group, Inc.
US ˙ NasdaqGS ˙ US51819L1070

SecuritySWIM / Latham Group, Inc.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership828,545 shares
Latest Disclosed Value $ 4,449,287
Citadel Advisors Llc ownership in SWIM / Latham Group, Inc.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 828,545 shares of Latham Group, Inc. (US:SWIM) valued at $4,449,287 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,463,172 shares of Latham Group, Inc.. This represents a change in shares of -76.08% during the quarter. The current value of the position is $4,374,718 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (SWIM) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

SWIM / Latham Group, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F LATHAM GROUP COM 51819L107 828,545 -2,634,627 -76.08 4,449 -79.77 0.0006
2026-02-17 2025-12-31 13F LATHAM GROUP COM 51819L107 3,463,172 -1,156,942 -25.04 21,991 -37.45 0.0029
2025-11-14 2025-09-30 13F LATHAM GROUP COM 51819L107 4,620,114 3,112,708 206.49 35,159 265.59 0.0054
2025-08-14 2025-06-30 13F LATHAM GROUP COM 51819L107 1,507,406 -969,145 -39.13 9,617 -39.61 0.0017
2025-05-15 2025-03-31 13F LATHAM GROUP COM 51819L107 2,476,551 2,476,551 15,924 0.0030
2025-02-14 2024-12-31 13F LATHAM GROUP COM 51819L107 0 -19,597 -100.00 0 -100.00
2024-11-14 2024-09-30 13F LATHAM GROUP COM 51819L107 19,597 19,597 133 0.0000
2024-08-14 2024-06-30 13F LATHAM GROUP COM 51819L107 0 -23,216 -100.00 0 -100.00
2024-05-15 2024-03-31 13F LATHAM GROUP COM 51819L107 23,216 2,528 12.22 92 68.52 0.0000
2024-02-14 2023-12-31 13F LATHAM GROUP COM 51819L107 20,688 -45,979 -68.97 54 -70.97 0.0000
2023-11-14 2023-09-30 13F LATHAM GROUP COM 51819L107 66,667 -112,425 -62.77 187 -71.99 0.0000
2023-08-14 2023-06-30 13F LATHAM GROUP COM 51819L107 179,092 -317,506 -63.94 664 -53.24 0.0001
2023-05-15 2023-03-31 13F LATHAM GROUP COM 51819L107 496,598 -77,943 -13.57 1,420 -23.24 0.0003
2023-02-14 2022-12-31 13F LATHAM GROUP COM 51819L107 574,541 -1,284,790 -69.10 1,850 -72.28 0.0004
2022-11-14 2022-09-30 13F LATHAM GROUP COM 51819L107 1,859,331 1,499,285 416.41 6,675 167.54 0.0015
2022-08-15 2022-06-30 13F LATHAM GROUP COM 51819L107 360,046 -287,224 -44.37 2,495 -70.89 0.0006
2022-05-16 2022-03-31 13F LATHAM GROUP COM 51819L107 647,270 647,270 8,570 0.0018
2022-02-14 2021-12-31 13F LATHAM GROUP Cmn 51819L107 0 -12,046 -100.00 0 -100.00
2021-11-15 2021-09-30 13F LATHAM GROUP Cmn 51819L107 12,046 -51,920 -81.17 198 -90.31 0.0000
2021-08-16 2021-06-30 13F LATHAM GROUP COM 51819L107 63,966 63,966 2,044 0.0005
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-08-14 2025-06-30 13F LATHAM GROUP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F LATHAM GROUP COM Call 3,500 23 n/a n/a n/a
2025-02-14 2024-12-31 13F LATHAM GROUP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-11-14 2024-09-30 13F LATHAM GROUP COM Call 1,500 650.00 10 n/a n/a n/a
2024-08-14 2024-06-30 13F LATHAM GROUP COM Call 200 -99.14 1 -100.00 n/a n/a n/a
2024-05-15 2024-03-31 13F LATHAM GROUP COM Call 23,200 1,350.00 92 2,175.00 n/a n/a n/a
2024-02-14 2023-12-31 13F LATHAM GROUP COM Call 1,600 -84.47 4 -85.71 n/a n/a n/a
2023-11-14 2023-09-30 13F LATHAM GROUP COM Call 10,300 35.53 29 0.00 n/a n/a n/a
2023-08-14 2023-06-30 13F LATHAM GROUP COM Call 7,600 13.43 28 47.37 n/a n/a n/a
2023-05-15 2023-03-31 13F LATHAM GROUP COM Call 6,700 91.43 19 72.73 n/a n/a n/a
2023-02-14 2022-12-31 13F LATHAM GROUP COM Call 3,500 11 n/a n/a n/a
2022-05-16 2022-03-31 13F LATHAM GROUP COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-14 2021-12-31 13F LATHAM GROUP COM Call 12,100 303 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2025-08-14 2025-06-30 13F LATHAM GROUP COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F LATHAM GROUP COM Put 3,300 21 n/a n/a n/a
2025-02-14 2024-12-31 13F LATHAM GROUP COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2024-11-14 2024-09-30 13F LATHAM GROUP COM Put 4,300 -57.00 29 -3.33 n/a n/a n/a
2024-08-14 2024-06-30 13F LATHAM GROUP COM Put 10,000 38.89 30 7.14 n/a n/a n/a
2024-05-15 2024-03-31 13F LATHAM GROUP COM Put 7,200 213.04 29 366.67 n/a n/a n/a
2024-02-14 2023-12-31 13F LATHAM GROUP COM Put 2,300 -8.00 6 -14.29 n/a n/a n/a
2023-11-14 2023-09-30 13F LATHAM GROUP COM Put 2,500 400.00 7 600.00 n/a n/a n/a
2023-08-14 2023-06-30 13F LATHAM GROUP COM Put 500 -97.42 2 -98.18 n/a n/a n/a
2023-05-15 2023-03-31 13F LATHAM GROUP COM Put 19,400 207.94 55 175.00 n/a n/a n/a
2023-02-14 2022-12-31 13F LATHAM GROUP COM Put 6,300 20 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.