X0306 4 2021-02-01 0 0001048695 F5 NETWORKS, INC. FFIV 0001728330 FOUNTAIN THOMAS DEAN C/O F5 NETWORKS, INC. 801 5TH AVENUE SEATTLE WA 98104 0 1 0 0 EVP Global Services & Strategy Common Stock 2021-02-01 4 M 0 3971 0.00 A 20096 D Common Stock 2021-02-01 4 F 0 1993 196.35 D 18103 D Restricted Stock Unit 0.00 2021-02-01 4 M 0 1143 0.00 D Common Stock 1143 12574 D Restricted Stock Unit 0.00 2021-02-01 4 M 0 651 0.00 D Common Stock 651 1955 D Restricted Stock Unit 0.00 2021-02-01 4 M 0 798 0.00 D Common Stock 798 5591 D Restricted Stock Unit 0.00 2021-02-01 4 M 0 1379 0.00 D Common Stock 1379 5517 D Shares acquired upon vesting of the February 1, 2018, November 1, 2018, November 1, 2019 and November 2, 2020 awards of service-based Restricted Stock Units. Each Restricted Stock Unit represents a contingent right to receive one share of F5 Networks, Inc. Common Stock on the vest date. This November 2, 2020 award of service-based Restricted Stock Units vests in twelve equal quarterly increments beginning February 1, 2021. If the reporting person continues to serve as an officer of the Company on the vest date, the corresponding number of shares of Common Stock of F5 Networks, Inc. will be issued to the reporting person on the vest date. This November 1, 2018 award of service-based Restricted Stock Units vests in twelve equal quarterly increments beginning February 1, 2019. This November 1, 2019 award of service-based Restricted Stock Units vests in twelve equal quarterly increments beginning February 1, 2020. Twenty five percent (25%) of this February 1, 2018 award of service-based Restricted Stock Units vests on February 1, 2019, and the remaining seventy five percent (75%) vests in twelve equal quarterly increments beginning May 1, 2019 /s/ Scot F. Rogers by Power of Attorney 2021-02-03