X0306 4 2022-03-23 0 0000105016 WATSCO INC WSO; WSOB 0001735259 Keeley Brian E. 2665 S. BAYSHORE DRIVE SUITE 901 MIAMI FL 33133 1 0 0 0 Common Stock 4323 D Common Stock 2022-03-23 4 M 0 5000 185.12 A 0 D Common Stock 2022-03-23 4 S 0 5000 300.2584 D 0 D Common Stock 2022-03-23 4 M 0 6000 160.69 A 0 D Common Stock 2022-03-23 4 S 0 3432 299.3582 D 0 D Common Stock 2022-03-23 4 S 0 2568 299.00 D 0 D Stock Option (right to buy) 185.12 2022-03-23 4 M 0 5000 185.12 D 2023-06-04 Common Stock 5000 0 D Stock Option (right to buy) 160.69 2022-03-23 4 M 0 6000 160.69 D 2024-06-03 Common Stock 6000 0 D Stock Option (right to buy) 175.07 2025-06-01 Common Stock 3500 3500 D The price reported in Column 8 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $300.00 to $300.53, inclusive. The reporting person undertakes to provide Watsco, any security holder of Watsco 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 set forth in footnote (1) to this Form 4. The price reported in Column 8 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $299.05 to $300.045, inclusive. The reporting person undertakes to provide Watsco, any security holder of Watsco 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 set forth in footnote (2) to this Form 4. The options vested 33 1/3% on June 4, 2018, June 4, 2019 and June 4, 2020, respectively. The options vested 33 1/3% on June 3, 2019, June 3, 2020 and June 3, 2021, respectively. The options vest 33 1/3% on June 1, 2020, June 1, 2021 and June 1, 2022, respectively. /s/ Brian E. Keeley 2022-03-25