X0508 4 2024-05-09 0 0000105016 WATSCO INC WSO; WSOB 0001888910 Macdonald John Alexander 2665 S. BAYSHORE DRIVE SUITE 901 MIAMI FL 33133 1 0 0 0 0 Common stock 2024-05-09 4 S 0 1000 468.94 D 1000 D Common stock 2024-05-09 4 M 0 1000 165.61 A 0 D Common stock 2024-05-09 4 S 0 1000 465.43 D 0 D Common stock 2024-05-09 4 M 0 3334 260.28 A 0 D Common stock 2024-05-09 4 S 0 2682 465.7475 D 0 D Common stock 2024-05-09 4 S 0 647 466.7756 D 0 D Common stock 2024-05-09 4 S 0 5 467.8267 D 0 D Stock Option (right to buy) 165.61 2024-05-09 4 M 0 1000 165.61 D 2024-09-09 Common Stock 1000 0 D Stock Option (right to buy) 260.28 2024-05-09 4 M 0 3334 260.28 D 2027-06-06 Common Stock 3334 1666 D The price reported in Column 8 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $465.43 to $466.29, 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 (4) 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 $466.53 to $467.30, 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 (4) 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 $467.60 to $468.03, 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 (4) to this Form 4. The options vested September 9, 2021. The options vest 33 1/3% on June 6, 2022, June 6, 2023 and June 6, 2024, respectively. /s/ John A. Macdonald 2024-05-13