F5, INC. — Director's Dealing 2010

May 10, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: F5 NETWORKS INC (FFIV)
CIK: 0001048695
Period of Report: 2010-05-10

Reporting Person: MCADAM JOHN (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-10	Common Stock	S	12500	$67.6283	Disposed	282615	Direct

Footnotes

F1: Sale pursuant to the terms of a 10b5-1 trading plan.