X0306 4 2021-02-01 0 0001048695 F5 NETWORKS, INC. FFIV 0001804708 Song Haiyan C/O F5 NETWORKS, INC. 801 5TH AVENUE SEATTLE WA 98104 0 1 0 0 EVP of Security Restricted Stock Unit 0.00 2021-02-01 4 A 0 17826 0.00 A Common Stock 17826 17826 D Each Restricted Stock Unit represents a contingent right to receive one share of F5 Networks, Inc. Common Stock on the vest date. Twenty five percent (25%) of this February 1, 2021 award of service-based Restricted Stock Units vests on February 1, 2022, and the remaining seventy five percent (75%) vests in twelve equal quarterly increments beginning May 1, 2022. 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. /s/ Scot F. Rogers by Power of Attorney 2021-02-03