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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 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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1. Name and Address of Reporting Person * KRIENS SCOTT   2. Issuer Name and Ticker or Trading Symbol JUNIPER NETWORKS INC [JNPR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chairman of the Board (Last) (First) (Middle) 1194 NORTH MATHILDA AVENUE 3. Date of Earliest Transaction (Month/Day/Year) 02/02/2010 (Street) SUNNYVALE, CA 94089 4. If Amendment, Date 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 (City) (State) (Zip) 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) Code V Amount (A) or (D) Price Common Stock 02/02/2010   M   500,000 A $ 10.31 553,466 D   Common Stock 02/02/2010   S   500,000 (1) D $ 25.0144 (2) 53,466 (3) D   Common Stock 02/02/2010   M   133,667 (4) A $ 0 (5) 187,133 D   Common Stock               527,037 I By Foundation (6) Common Stock               7,761,672 I by 1996 Kriens Trust (7) Common Stock               384,750 I by Partnership (8)

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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 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)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Non-Qualified Stock Option (right to buy)

$ 10.31

02/02/2010

M

500,000

05/28/2002

05/28/2012

Common Stock

500,000

$ 0 (9)

1,200,000

D

Performance Shares

$ 0

02/02/2010

M

133,667 (4)

02/02/2010

03/09/2010

Common Stock

133,667

$ 0 (9)

0 (10)

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
KRIENS SCOTT 1194 NORTH MATHILDA AVENUE SUNNYVALE, CA 94089	X		Chairman of the Board

Signatures

By: Mitchell L. Gaynor, Attorney in Fact For: Scott G. Kriens		02/04/2010
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(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 24.90 to 25.10 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 on 1/29/2010.
(4)	Represents the issuance of common stock pursuant to the vest of performance share award.
(5)	Represents the per share price for the award.
(6)	Held by the Kriens Family Foundation, over which the reporting person and his spouse exercise voting and investment control.
(7)	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.
(8)	Held by Saratoga Investments, LP over which the reporting person exercises voting and investment control.
(9)	Column 8 is not an applicable reportable field.
(10)	There are no remaining shares earnable from this award.

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