F5, INC. — Director's Dealing 2019

May 4, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: F5 NETWORKS INC (FFIV)
CIK: 0001048695
Period of Report: 2019-04-30

Reporting Person: SPRAGUE KARA LYNN (Sr. VP, General Manager of ADC)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-04-30	Common Stock	J	139	$133.365	Acquired	6531	Direct
2019-05-01	Common Stock	M	1709	$0.00	Acquired	8240	Direct
2019-05-02	Common Stock	S	678	$151.58	Disposed	7562	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-05-01	Restricted Stock Unit	$0.00	M	1244	Disposed		Common Stock (1244)	Direct
2019-05-01	Restricted Stock Unit	$0.00	M	465	Disposed		Common Stock (465)	Direct

Footnotes

F1: Shares acquired on April 30, 2019 under the F5 Networks, Inc. employee stock purchase plan in an exempt transaction pursuant to rule 16b-3(c).

F2: Shares acquired upon vesting of the November 1, 2017 and November 1, 2018 awards of service-based Restricted Stock Units.

F3: This transaction was executed pursuant to a Rule 10b5-1 trading plan.

F4: Each Restricted Stock Unit represents a contingent right to receive one share of F5 Networks, Inc. Common Stock on the vest date.

F5: This November 1, 2017 award of service-based Restricted Stock Units vests twenty five percent (25%) on November 1, 2018, and the remaining
seventy five percent (75%) vests in twelve equal quarterly increments beginning February 1, 2019.

F6: 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.

F7: This November 1, 2018 award of service-based Restricted Stock Units vests in twelve equal quarterly increments beginning February 1, 2019.