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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1364962	Imperva Inc	IMPV	Services-Prepackaged Software (7372)	030460133

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1190636	M Steven Krausz	2735 Sand Hill Road Menlo Park CA 94025		Yes	No	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	Disposition	2012-05-30	300,000	$0.00	1,478,200	No	4	J	Indirect	Directly owned by USVP VIII
Common Stock	Disposition	2012-05-30	2,896	$0.00	12,812	No	4	J	Indirect	Directly owned by AFF VIII
Common Stock	Disposition	2012-05-30	2,773	$26.83	16,433	No	4	S	Indirect	Directly owned by EP VIII-A
Common Stock	Disposition	2012-05-30	1,406	$26.83	8,327	No	4	S	Indirect	Directly owned by EP VIII-B
Common Stock	Disposition	2012-05-31	2,773	$25.88	13,660	No	4	S	Indirect	Directly owned by EP VIII-A
Common Stock	Disposition	2012-05-31	1,406	$25.88	6,921	No	4	S	Indirect	Directly owned by EP VIII-B

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	J	Indirect	Directly owned by USVP VIII
No	4	J	Indirect	Directly owned by AFF VIII
No	4	S	Indirect	Directly owned by EP VIII-A
No	4	S	Indirect	Directly owned by EP VIII-B
No	4	S	Indirect	Directly owned by EP VIII-A
No	4	S	Indirect	Directly owned by EP VIII-B

Footnotes

Prorata distribution in kind from partnership without consideration to its partners.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.92 to $26.74, inclusive for sales made on May 30, 2012; and prices ranging from $26.28 to $25.76, inclusive for sales made on May 31, 2012. The reporting persons undertake to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.
Steven M. Krausz is a managing member of Presidio Management Group VIII, LLC ("PMG VIII"). PMG VIII is the general partner of US Venture Partners VIII, L.P. ("USVP VIII"), USVP Entrepreneur Partners VIII-A, L.P. ("EP VIII-A"), USVP Entrepreneur Partners VIII-B, L.P. ("EP VIII-B"), and USVP VIII Affiliates Fund, L.P. ("AFF VIII"), and Irwin Federman, Winston S. Fu, David E. Liddle, Paul A Matteucci, Jonathan D. Root, Christopher J. Rust, Casey M. Tansey, and Philip M. Young may be deemed to share voting and dispositive power over the shares held by USVP VIII, EP VIII-A, EP VIII-B and AFF VIII. Such persons and entities disclaim beneficial ownership of shares held by USVP VIII, EP VIII-A, EP VIII-B and AFF VIII except to the extent of any pecuniary interest therein.