X0306 4 2022-08-09 0 0001078075 NETSCOUT SYSTEMS INC NTCT 0001232878 DOWNING JOHN C/O NETSCOUT SYSTEMS, INC. 310 LITTLETON ROAD WESTFORD MA 01886 0 1 0 0 EVP, World-Wide Sales Common Stock 2022-08-09 4 F 0 5974 33.95 D 119086 D Common Stock 2022-08-09 4 S 0 3000 33.67 D 116086 D The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the delivery of shares pursuant to Restricted Stock Units which vested on August 1, 2022 and which shares of Common Stock were delivered to the reporting person on August 9, 2022. Represents the closing price of the Company's Common Stock on August 8, 2022. The shares of Common Stock were sold pursuant to a 10b5-1 plan. By: /s/ John Downing 2022-08-11