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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1368582	Arcsight Inc	ARST	Services-Prepackaged Software (7372)	522241535

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1437884	A Jeffrey Scheel	C/O Arcsight, Inc. 5 Results Way Cupertino CA 95014	Sr. Vp, Business Development	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	Explanation
Common Stock	Acquisiton	2010-03-30	4,998	$8.50	5,991	No	4	M	Direct
Common Stock	Disposition	2010-03-30	4,998	$28.19	993	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
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	Stock Option (Right to Buy)	Disposition	2010-03-30	4,998	$0.00	4,998	$8.50

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
22,503		2018-06-17	No	4	M	Direct

Footnotes

Includes 993 shares acquired by the reporting person on March 15, 2010 under the ArcSight, Inc. 2007 Employee Stock Purchase Plan.
Represents a weighted average sales price per share. The prices actually received ranged from $28.15 to $28.20. The reporting person has provided to the issuer, and will provide to the SEC staff or any security holder of the issuer, information regarding the number of shares sold at each price within the range.
Represents 993 shares acquired by the reporting person on March 15, 2010 under the ArcSight, Inc. 2007 Employee Stock Purchase Plan.
The option vested and became exercisable as to 1/4th of the shares on June 16, 2009 and vests and becomes exercsiable as to 1/48th of the shares at the end of each full month thereafter.