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FORM 4UNITED 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, Section 17(a) of the Public Utility Holding Company Act of 1935 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*
KRIENS SCOTT

(Last)(First)(Middle)
1194 NORTH MATHILDA AVENUE

(Street)
SUNNYVALECA94089

(City)(State)(Zip)
2. Issuer Name and Ticker or Trading Symbol
JUNIPER NETWORKS INC [JNPR]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
Chairman of the Board
3. Date of Earliest Transaction (Month/Day/Year)
08/17/2009
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock 08/17/2009 M  550,000 A$ 5.69 602,993 D  
Common Stock 08/17/2009 S  550,000 (1) D$ 23.6837 (2) 52,993 (3) D  
Common Stock         27,037 I By Foundation (4)
Common Stock         8,481,672 I by 1996 Kriens Trust (5)
Common Stock         384,750 I by Partnership (6)

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 Security3. 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 Underlying Securities
(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 of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Non-Qualified Stock Option (right to buy) $ 5.69 08/17/2009 M   550,000 07/01/2003(7)07/01/2012 Common Stock 550,000 $ 0 (8) 0 D  
Explanation of Responses:
1. Transaction pursuant to the Reporting Person's 10b5-1 Plan.
2. The sale price represents the weighted average sale price in the range of 23.50 to 23.90 per share. The Company can provide the full information regarding the number of shares sold at each separate price upon further request.
3. Amount of securities includes shares acquired by the reporting person under the Juniper Networks, Inc. 2008 Employee Stock Purchase Plan.
4. Held by the Kriens Family Foundation, over which the reporting person and his spouse exercise voting and investment control.
5. Held by the Kriens 1996 Trust U/T/A October 29, 1996 over which the Reporting Person and his spouse exercise investment and voting control.
6. Held by Saratoga Investments, LP over which the reporting person exercises voting and investment control.
7. Vests as to 25% of the shares subject to the option one year from the grant date and the balance shall vest in thirty six successive equal monthly installments thereafter.
8. Column 8 is not an applicable reportable field.
By: Mitchell L. Gaynor, Attorney-in-Fact For: Scott G. Kriens08/17/2009
** Signature of Reporting PersonDate
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.
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.

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