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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1050550	Volterra Semiconductor Corp	VLTR	Semiconductors & Related Devices (3674)	943251865

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1294497	Jeffrey Staszak	C/O Volterra Semiconductor Corporation 47467 Fremont Blvd. Fremont CA 94538	President, Ceo	Yes	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	2010-12-16	6,250	$5.00	345,645	No	4	M	Direct
Common Stock	Disposition	2010-12-16	6,250	$23.54	339,395	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	2010-12-16	6,250	$0.00	6,250	$5.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
567,500	2004-01-27	2014-01-26	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	37,250	Indirect	Held in Trust

Footnotes

The option exercise and sale reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 27, 2010.
This Amendment is filed to properly document the amount of securities beneficially owned following this reported transaction, which had previously been reported as 345,097.
This Amendment is filed to properly document the amount of securities beneficially owned following this reported transaction, which had previously been reported as 338,847.
Held by the Staszak Family Living Trust, of which the reporting person is a co-trustee.