X0306 4 2019-02-01 0 0001048695 F5 NETWORKS INC FFIV 0001728880 WHITE ANA MARIA C/O F5 NETWORKS, INC. 401 ELLIOTT AVE. W. SEATTLE WA 98119 0 1 0 0 EVP and Chief HR Officer Common Stock 2019-02-01 4 M 0 5729 0.00 A 5729 D Common Stock 2019-02-04 4 S 0 2296 159.50 D 3433 D Common Stock 2019-02-04 4 S 0 7 160.7203 D 3426 D Restricted Stock Unit 0.00 2019-02-01 4 M 0 558 0.00 D Common Stock 558 6143 D Restricted Stock Unit 0.00 2019-02-01 4 M 0 5171 0.00 D Common Stock 5171 15515 D Shares acquired upon vesting of the February 1, 2018 and November 1, 2018 awards of service-based Restricted Stock Units. This transaction was executed pursuant to a Rule 10b5-1 trading plan. This transaction was executed pursuant to a Rule 10b5-1 trading plan, in multiple trades at prices ranging from $160.6302 to $161.0313. The reported price is the weighted average sale price. The reporting person undertakes to provide to the Company, any security holder of the Company, or Securities and Exchange Commission staff, upon request, complete information regarding the number of shares sold at each separate price. Each Restricted Stock Unit represents a contingent right to receive one share of F5 Networks, Inc. Common Stock 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. 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 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/ Joseph P. McDermott by Power of Attorney 2019-02-05