X0508 4 2026-01-05 0 0001834622 Hayward Holdings, Inc. HAYW 0001851021 HOLLERAN KEVIN HAYWARD HOLDINGS, INC. 1415 VANTAGE PARK DRIVE, SUITE 400 CHARLOTTE NC 28203 1 1 0 0 President and CEO 1 Common Stock 2026-01-05 4 M 0 52390 1.40 A 675930 D Common Stock 2026-01-05 4 S 0 52390 15.9935 D 623540 D Common Stock 700 I By Child A Common Stock 0 I By Child B Common Stock 0 I By Child C Stock Options (Right to Buy) 1.40 2026-01-05 4 M 0 52390 0 D 2021-08-12 2029-12-24 Common Stock 52390 2462181 D The transactions reported on this Form 4 were effected pursuant to the Rule 10b5-1 trading plan adopted by the Reporting Person on March 11, 2025. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $15.7950 to $16.0750, inclusive. The Reporting Person undertakes to provide to the Company, any security holder of the Company or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. The reporting person previously reported indirect beneficial ownership of 700 shares held in the name of the reporting person's child, who has since moved out of the reporting person's household. Accordingly, the reporting person no longer has a reportable beneficial interest in such shares included in the reporting person's prior ownership reports. /s/ Susan Canning, attorney-in-fact 2026-01-07