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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(Print or Type Responses)

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) 04/01/2010 (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 04/01/2010   M   55,596 (1) A $ 0 (2) 109,062 D   Common Stock               277,037 I By Foundation (3) Common Stock               7,900,939 I by 1996 Kriens Trust (4) Common Stock               384,750 I by Partnership (5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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

Performance Shares

$ 0 (2)

04/01/2010

M

55,596 (1)

04/01/2010(6)

04/01/2010

Common Stock

55,596 (1)

$ 0 (7)

0

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		04/05/2010
**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)	Represents acquistion of shares vested under the performance share award granted 4/1/2009. The shares vest upon determination of the achievement of certain Company performance targets following the fiscal year end.
(2)	This is a full value award.
(3)	Held by the Kriens Family Foundation, over which the reporting person and his spouse exercise voting and investment control.
(4)	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.
(5)	Held by Saratoga Investments, LP over which the reporting person exercises voting and investment control.
(6)	The earned portion of the Performance Shares will vest one year from the effective date of the grant, 4/1/2009.
(7)	Column 8 is not an applicable reportable field.

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