X0609 4 2026-08-18 0 0001169561 COMMVAULT SYSTEMS INC CVLT 0001560814 Merrill Gary false 1 COMMVAULT WAY TINTON FALLS NJ 07724 0 1 0 0 Chief Financial Officer 1 Common Stock 2026-08-18 4 S 0 1854 143.64 D 70921 D Common Stock 2026-08-19 4 S 0 1293 142.80 D 69628 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 sale reported in this Form 4 was effected pursuant to an existing Rule 10b5-1 trading plan adopted by the reporting person on November 20, 2024, as amended on June 13, 2025. /s/ Danielle Abrahamsen, Attorney-in-Fact 2026-08-19