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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	310 Littleton Road Westford MA 01886	Cfo & Vp General Operations	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	2010-01-26	4,757	$0.00	116,659	No	4	M	Direct
Common Stock	Disposition	2010-01-26	1,806	$14.66	114,853	No	4	F	Direct
Common Stock	Acquisiton	2010-01-26	10,000	$4.22	124,853	No	4	M	Direct
Common Stock	Disposition	2010-01-26	10,000	$14.62	114,853	No	4	S	Direct
Common Stock	Acquisiton	2010-01-27	10,000	$4.22	124,853	No	4	M	Direct
Common Stock	Disposition	2010-01-27	10,000	$14.35	114,853	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
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	2010-01-26	4,757	$0.00	4,757	$0.00
Common Stock	Employee Stock Options (Right to Buy)	Disposition	2010-01-26	10,000	$0.00	10,000	$4.22
Common Stock	Employee Stock Options (Right to Buy)	Disposition	2010-01-27	10,000	$0.00	10,000	$4.22

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
52,500	2010-01-26		No	4	M	Direct
50,000		2010-04-25	No	4	M	Direct
40,000		2010-04-25	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.
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 opening price of the Company's Common Stock on the date such grant vested, which was January 24, 2010. Because such date occurred during the Company's blackout period, such shares were not actually issued until the Company's blackout period ended, which was January 26, 2010.
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 $14.48 to $14.78.
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 $14.23 to $14.45.
2,500 of these shares are held by a trust in which the reporting person has a pecuniary interest.
Date is N/A.
The initial portion of the option grant initially became exercisable on June 13, 2004 and the remainder vested in equal quarterly installments thereafter.