SEC FORM 4

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Reinland Andrew

(Last)

(First)

(Middle)

C/O F5 NETWORKS, INC.

401 ELLIOTT AVE. WEST

(Street)

SEATTLE

98119

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
F5 NETWORKS INC [ FFIV ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Sr.VP, Chief Finance Officer

3. Date of Earliest Transaction (Month/Day/Year)
08/01/2008

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	08/01/2008		M⁽¹⁾		7,492	A	$0.00	76,488	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	$0.00	08/01/2008		M			5,654	02/01/2007	12/15/2016	Common Stock	5,654	$0.00	3,118	D
Restricted Stock Units	$0.00	08/01/2008		M			1,838	11/01/2007	08/01/2017	Common Stock	1,838	$0.00	14,700	D
Restricted Stock Units	$0.00	08/01/2008		A		33,600		11/01/2008⁽²⁾	08/01/2018	Common Stock	33,600	$0.00	33,600	D

Explanation of Responses:

1. Shares received from vesting of the 12/15/2006 and 8/1/2007 restricted stock unit grant.

2. Fifty percent (50%) of the aggregate number of RSUs in the grant vest in equal quarterly increments over two years, until such portion of the grant is fully vested on August 1, 2010. Twenty five percent (25%) of the grant is subject to the Company achieving specified percentage increases in total revenue during the period beginning in the fourth quarter of fiscal year 2008 through the third quarter of fiscal year 2009, relative to the same periods in fiscal years 2007 and 2008. The remaining twenty five percent (25%) is subject to the Company meeting specified performance criteria for a twelve month period in fiscal years 2009 and 2010 to be set by the Compensation Committee of the Company's Board of Directors.

Remarks:

	/s/ Jeffrey A. Christianson by Power of Attorney	08/05/2008
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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