Initial Statement of Beneficial Ownership (3)

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^*

Kearny Ryan C.

2. Date of Event Requiring Statement (MM/DD/YYYY) 9/6/2016

3. Issuer Name and Ticker or Trading Symbol

F5 NETWORKS INC [FFIV]

(Last) (First) (Middle)

C/O F5 NETWORKS, INC., 401 ELLIOTT AVE. W.

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

_____ Director _____ 10% Owner
___ X ___ Officer (give title below) _____ Other (specify below)
Interim CTO & EVP /

(Street)

SEATTLE, WA 98119

(City) (State) (Zip)

5. If Amendment, Date Original Filed (MM/DD/YYYY)

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 Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Restricted Stock Units ⁽¹⁾	⁽²⁾	⁽³⁾	Common Stock	458	$0.00	D
Restricted Stock Units ⁽¹⁾	⁽⁴⁾	⁽³⁾	Common Stock	8321	$0.00	D
Restricted Stock Units ⁽¹⁾	⁽⁵⁾	⁽³⁾	Common Stock	2542	$0.00	D

Explanation of Responses:
( 1)	Each Restricted Stock Unit represents a contingent right to receive one share of F5 Networks, Inc. Common Stock on the vest date.
( 2)	The service-based Restricted Stock Units (RSUs) outstanding under this 11/03/2014 grant vest 100% on 11/01/2016.
( 3)	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.
( 4)	The service-based Restricted Stock Units outstanding under this 12/10/2014 grant vest 100% on 02/01/2018.
( 5)	The service-based Restricted Stock Units outstanding under this 11/02/2015 grant vest as follows: 508 vest 11/01/2016, 508 vest 02/01/2017, 509 vest 05/01/2017, 508 vest 08/01/2017, and 509 vest 11/01/2017.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Kearny Ryan C. C/O F5 NETWORKS, INC. 401 ELLIOTT AVE. W. SEATTLE, WA 98119			Interim CTO & EVP

Signatures
/s/ Scot F. Rogers by Power of Attorney		9/15/2016
^** 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 5(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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.