Ownership Submission
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, 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 *
  CADIAN CAPITAL MANAGEMENT, LLC
 2. Date of Event Requiring Statement (Month/Day/Year)
11/11/2011		 3. Issuer Name and Ticker or Trading Symbol
NETSCOUT SYSTEMS INC [NTCT]
(Last)
(First)
(Middle)
461 FIFTH AVENUE, 24TH FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

NEW YORK, NY 10017		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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 4,180,499
I
See Footnote (1)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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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 of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
CADIAN CAPITAL MANAGEMENT, LLC
461 FIFTH AVENUE
24TH FLOOR
NEW YORK, NY 10017		     X    
Bannasch Eric
C/O CADIAN CAPITAL MANAGEMENT LLC
461 FIFTH AVENUE, 24TH FLOOR
NEW YORK, NY 10017		     X    

Signatures

Cadian Capital Management LLC(+), By: /s/ Eric Bannasch, Managing Member 11/16/2011
**Signature of Reporting Person Date
/s/ Eric Bannasch(+) 11/16/2011
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) These securities are held in the accounts of several investment partnerships and investment funds (collectively, the "Investment Vehicles") for which Cadian Capital Management LLC ("Cadian") serves as investment manager. Eric Bannasch is the managing member of Cadian. Cadian and Mr. Bannasch may be deemed to beneficially own the securities held by the Investment Vehicles by virtue of Cadian's position as investment manager of the Investment Vehicles and Mr. Bannasch's status as the managing member of Cadian.
 
Remarks:
(+)  Each of the Reporting Person and the joint filer (individually, each a "Reporting Person" and collectively, the "Reporting Persons") disclaims beneficial ownership of the reported securities except to the extent of his or its pecuniary interest therein.  The Reporting Persons affirmatively disclaim being a "group" for purposes of Section 16 of the Securities Exchange Act of 1934, as amended.

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