X0306 4 2021-02-01 0 0001048695 F5 NETWORKS, INC. FFIV 0001771433 Yamamoto Mika C/O F5 NETWORKS, INC. 801 5TH AVENUE SEATTLE WA 98104 0 1 0 0 EVP, Chief Marketing Officer Common Stock 2021-02-01 4 M 0 2960 0.00 A 10575 D Common Stock 2021-02-01 4 F 0 1189 196.35 D 9386 D Restricted Stock Unit 0.00 2021-02-01 4 M 0 793 0.00 D Common Stock 793 8733 D Restricted Stock Unit 0.00 2021-02-01 4 M 0 1511 0.00 D Common Stock 1511 15112 D Restricted Stock Unit 0.00 2021-02-01 4 M 0 656 0.00 D Common Stock 656 4592 D Shares acquired upon vesting of the August 1, 2019, November 1, 2019 and the 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. Twenty five percent (25%) of this August 1, 2019 award of service-based Restricted Stock Units vests on August 1, 2020, and the remaining seventy five percent (75%) vests in twelve equal quarterly increments beginning November 1, 2020. This November 1, 2019 award of service-based Restricted Stock Units vests in twelve equal quarterly increments beginning February 1, 2020. /s/ Scot F. Rogers by Power of Attorney 2021-02-03