X0306 4 2020-09-10 0 0001078075 NETSCOUT SYSTEMS INC NTCT 0001189174 EGAN JOHN R C/O NETSCOUT SYSTEMS, INC. 310 LITTLETON ROAD WESTFORD MA 01886 1 0 0 0 Common Stock 2020-09-10 4 M 0 7000 A 95740 D Restricted Stock Unit 2020-09-10 4 M 0 7000 D 2020-09-10 Common Stock 7000 0 D Restricted Stock Unit 2020-09-10 4 A 0 7000 A Common Stock 7000 7000 D The shares of Common Stock were acquired upon the vesting of certain restricted stock units previously granted to the reporting person. Price is N/A. Date is N/A. All of the Restricted Stock Units vest on the first anniversary of the date of grant, provided that during the period from the date of grant through such vesting date, the reporting person attends at least 75% of the meetings, collectively, of the Board and any committee of the Board of which the reporting person is a member. In the event that the attendance requirements are not met, the Restricted Stock Units will not become vested until 09/10/2023. /s/ Jeff Levinson, by Power of Attorney 2020-09-14