X0306 4 2018-11-01 0 0001048695 F5 NETWORKS INC FFIV 0001684581 Kearny Ryan C. C/O F5 NETWORKS, INC. 401 ELLIOTT AVE. W. SEATTLE WA 98119 0 1 0 0 CTO & SVP, Product Development Common Stock 2018-11-01 4 M 0 8032 0.00 A 14139 D Common Stock 2018-11-01 4 S 0 1100 175.3195 D 13039 D Common Stock 2018-11-01 4 S 0 400 176.3825 D 12639 D Common Stock 2018-11-01 4 S 0 3108 178.4234 D 9531 D Common Stock 2018-11-01 4 S 0 2128 179.0761 D 7403 D Common Stock 2018-11-01 4 S 0 1490 177.4351 D 5913 D Restricted Stock Unit 0.00 2018-11-01 4 M 0 343 0.00 D Common Stock 343 2738 D Restricted Stock Unit 0.00 2018-11-01 4 M 0 7301 0.00 D Common Stock 7301 0 D Restricted Stock Unit 0.00 2018-11-01 4 M 0 388 0.00 D Common Stock 388 4665 D Restricted Stock Unit 0.00 2018-11-01 4 A 0 4188 0.00 A Common Stock 4188 4188 D Shares acquired upon vesting of the November 1, 2016 and November 1, 2017 awards of service-based Restricted Stock Units. This transaction was executed pursuant to a Rule 10b5-1 trading plan, in multiple trades at prices ranging from $174.72 to $175.60. 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. This transaction was executed pursuant to a Rule 10b5-1 trading plan, in multiple trades at prices ranging from $175.86 to $176.82. 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. This transaction was executed pursuant to a Rule 10b5-1 trading plan, in multiple trades at prices ranging from $177.86 to $178.83. 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. This transaction was executed pursuant to a Rule 10b5-1 trading plan, in multiple trades at prices ranging from $178.86 to $179.23. 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. This transaction was executed pursuant to a Rule 10b5-1 trading plan, in multiple trades at prices ranging from $176.86 to $177.83. 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, 2016 award of service-based Restricted Stock Units vests in sixteen equal quarterly increments beginning February 1, 2017. If the reporting person continues to provide services to the Company through 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, 2016 award of service-based Restricted Stock Units vests 100% on November 1, 2018. This November 1, 2017 award of service-based Restricted Stock Units vests in sixteen equal quarterly increments beginning February 1, 2018. Concurrent with the award of 4,188 service-based Restricted Stock Units, the Company granted the reporting person additional Restricted Stock Units that vest based on performance targets ("Performance RSUs"). If the performance targets are achieved at 100%, the reporting person will receive 4,188 Performance RSUs over the vesting period; the actual number of Performance RSUs received may be more or less depending on whether and to the extent that performance is greater than or less than targets. The Performance RSUs vests over a three-year period in three equal annual installments. Performance RSUs are not reported in Table II; the underlying shares of Performance RSUs will be reported in Table I if and when the Compensation Committee of the Board of Directors determines that the performance targets have been achieved. This November 1, 2018 award of service-based Restricted Stock Units vests in twelve equal quarterly increments beginning February 1, 2019. /s/ Scot F. Rogers by Power of Attorney 2018-11-05