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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1078075	Netscout Systems Inc	NTCT	Services-Computer Integrated Systems Design (7373)	042837575

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1232878	John Downing	C/O Netscout Systems, Inc. 310 Littleton Road Westford MA 01886	Svp, Worldwidesalesoperations	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Disposition	2011-05-03	10,000	$24.31	50,002	No	4	S	Direct
Common Stock	Acquisiton	2011-05-03	2,500	$0.00	52,502	No	4	M	Direct
Common Stock	Disposition	2011-05-03	794	$27.02	51,708	No	4	F	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	M	Direct
No	4	F	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Unit	Disposition	2011-05-03	2,500	$0.00	2,500	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
51,503	2011-04-05		No	4	M	Direct

Footnotes

The shares of Common Stock were sold pursuant to a 10b5-1 plan.
The shares sold on this date were sold in multiple transactions. This price is the weighted average sales price per share; the actual sales price per share ranged from $24.24 to $24.39.
The shares of Common Stock were acquired upon the vesting of certain Restricted Stock Units previously granted to the reporting person.
Price is N/A.
The shares of Common Stock were withheld to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units.
Represents the closing price of the Company's Common Stock on April 4, 2011.
Date is N/A