F5, INC. — Director's Dealing 2015

May 5, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: F5 NETWORKS INC (FFIV)
CIK: 0001048695
Period of Report: 2015-05-01

Reporting Person: Rivelo Manuel Felix (EVP, Strategic Solutions)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-01	Common Stock	M	5064	$0.00	Acquired	20170	Direct
2015-05-01	Common Stock	S	2800	$122.5603	Disposed	17370	Direct
2015-05-01	Common Stock	S	3288	$123.3508	Disposed	14082	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-01	Restricted Stock Units	$0.00	M	2500	Disposed		Common Stock (2500)	Direct
2015-05-01	Restricted Stock Units	$0.00	M	956	Disposed		Common Stock (956)	Direct
2015-05-01	Restricted Stock Units	$0.00	M	947	Disposed		Common Stock (947)	Direct
2015-05-01	Restricted Stock Units	$0.00	M	661	Disposed		Common Stock (661)	Direct
2015-05-01	Restricted Stock Units	$0.00	A	6147	Acquired		Common Stock (6147)	Direct

Footnotes

F1: Shares acquired upon vesting of the November 1, 2011, November 1, 2012, November 1, 2013, and November 3, 2014 awards of service-based Restricted Stock Units.

F2: This transaction was executed pursuant to a Rule 10b5-1 trading plan, in multiple trades at prices ranging from $121.98 to $122.95. 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.

F3: This transaction was executed pursuant to a Rule 10b5-1 trading plan, in multiple trades at prices ranging from $122.99 to $123.7769. 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.

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

F5: Twenty-five percent (25%) of the November 1, 2011 award of service-based Restricted Stock Units vested on November 1, 2012, and the remaining seventy-five percent (75%) vests in twelve equal quarterly increments beginning February 1, 2013.

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: The November 1, 2012 award of service-based Restricted Stock Units vests in sixteen equal quarterly increments beginning February 1, 2013.

F8: The November 1, 2013 award of service-based Restricted Stock Units vests in sixteen equal quarterly increments beginning February 1, 2014.

F9: The November 3, 2014 award of service-based Restricted Stock Units vests in sixteen equal quarterly increments beginning February 1, 2015.

F10: Concurrent with this award of 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 6,147 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. 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.

F11: The May 1, 2015 award of service-based Restricted Stock Units vests in sixteen equal quarterly increments beginning August 1, 2015.