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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
1232882	P David Sommers	C/O Netscout Systems, Inc. 310 Littleton Road Westford MA 01886	Executive Vice-Chairman	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	Acquisiton	2012-02-06	17,500	$0.00	193,140	No	4	M	Direct
Common Stock	Disposition	2012-02-06	5,724	$20.93	187,416	No	4	F	Direct
Common Stock	Acquisiton	2012-02-07	25,000	$4.22	212,416	No	4	M	Direct
Common Stock	Disposition	2012-02-07	25,000	$21.12	187,416	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Unit	Disposition	2012-02-06	17,500	$0.00	17,500	$0.00
Common Stock	Employee Stock Options (Right to Buy)	Disposition	2012-02-07	25,000	$0.00	25,000	$4.22

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
53,663	2012-02-06		No	4	M	Direct
0		2012-07-17	No	4	M	Direct

Footnotes

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.
2,500 of these shares are held by a trust in which the reporting person has a pecuniary interest.
The shares of Common Stock were withheld by the Company to satisfy the reporting person's tax withholding obligation upon the vesting of restricted stock units. The withheld shares were returned to treasury.
Represents the closing price of the Company's Common Stock on February 3, 2012.
Option was exercised and related Common stock was 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 $20.98 to $21.22.
Date is N/A.
Option vested over three years in equal quarterly installments. The initial portion of the option grant initially became exercisable on September 13, 2003, and the remainder vested in equal quarterly installments thereafter.