SEC FORM 3

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

GAYNOR MITCHELL L

(Last)

(First)

(Middle)

1194 NORTH MATHILDA AVENUE

(Street)

SUNNYVALE

94089

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
08/16/2007

3. Issuer Name and Ticker or Trading Symbol
JUNIPER NETWORKS INC [ JNPR ]

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

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	VP General Counsel & Secretary

5. 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 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)
Common Stock	469	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Non-Qualified Stock Option (right to buy)	03/16/2008⁽¹⁾	03/16/2014	Common Stock	27,500	$18.01	D
Non-Qualified Stock Option (right to buy)	09/17/2005⁽¹⁾	09/17/2014	Common Stock	90,000	$24.14	D
Non-Qualified Stock Option (right to buy)	02/07/2005⁽²⁾	02/20/2014	Common Stock	250,000	$25.53	D
RSU Award	02/08/2008⁽³⁾	02/08/2009	Common Stock	19,000	$0	D
RSU Award	02/08/2008⁽⁴⁾	02/08/2010	Common Stock	9,000	$0	D
RSU Award	02/25/2009⁽⁴⁾	02/25/2011	Common Stock	11,000	$0	D

Explanation of Responses:

1. Vests as to 25% of the shares subject to the option one year from the grant date and monthly thereafter as to 1/48th of the shares subject to the option.

2. Vests as to 25% of the shares one year from the applicable vesting commencement date and 1/48th monthly thereafter.

3. Vests as to 75% of the shares on the two year anniversary of the grant date and 25% on the third anniversary.

4. Vests as to 50% of the shares on the two year anniversary of the grant date and 25% annually on the third anniversary and fourth anniversary.

	Mitchell L. Gaynor	08/16/2007
	** 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 Number.