X0508 4 2025-11-18 0 0001169561 COMMVAULT SYSTEMS INC CVLT 0001765820 Mirchandani Sanjay 1 COMMVAULT WAY TINTON FALLS NJ 07724 1 1 0 0 President & CEO 1 Common Stock 2025-11-18 4 S 0 6820 123.58 D 380202 D Common Stock 2025-11-18 4 S 0 5794 123.37 D 374408 D Common Stock 2025-11-18 4 S 0 1939 124.64 D 372469 D Common Stock 2025-11-18 4 S 0 100 125.81 D 372369 D Common Stock 2025-11-19 4 S 0 2845 119.75 D 369524 D Common Stock 2025-11-19 4 S 0 3552 120.99 D 365972 D Common Stock 2025-11-19 4 S 0 6604 121.81 D 359368 D Common Stock 2025-11-19 4 S 0 108 122.59 D 359260 D Represents shares automatically sold solely to satisfy tax withholding obligations of reporting person on vesting of restricted and performance stock. Proceeds from the sale were submitted to the Internal Revenue Service. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.58 to $124.33, inclusive. Full information regarding the number of shares sold at each separate price will be provided by the reporting person upon request to the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer. The sale reported in this Form 4 was effected pursuant to an existing Rule 10b5-1 trading plan adopted by the reporting person on November 18, 2024. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.89 to $123.86, inclusive. Full information regarding the number of shares sold at each separate price will be provided by the reporting person upon request to the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.07 to $124.99, inclusive. Full information regarding the number of shares sold at each separate price will be provided by the reporting person upon request to the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $119.31 to $120.29, inclusive. Full information regarding the number of shares sold at each separate price will be provided by the reporting person upon request to the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.44 to $121.37, inclusive. Full information regarding the number of shares sold at each separate price will be provided by the reporting person upon request to the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $121.45 to $122.40, inclusive. Full information regarding the number of shares sold at each separate price will be provided by the reporting person upon request to the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer. /s/ Danielle Abrahamsen, Attorney-in-Fact 2025-11-20