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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
945436	Memc Electronic Materials Inc	WFR	Semiconductors & Related Devices (3674)	561505767

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1502784	A. Scott Weisberg	C/O Memc Electronic Materials, Inc. P.o. Box 8 St. Peters, MO 63376	Svp & Chief Hr Officer	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	2010-10-05	12,300	$12.11	12,300	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (Right to Buy)	Acquisiton	2010-10-04	200,000	$0.00	200,000	$11.76

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
200,000		2020-10-04	No	4	A	Direct

Footnotes

This purchase was effected pursuant to a Rule 10b5-1 Plan in multiple transactions on October 5, 2010, as follows: 8,700 shares at $12.11 and 3,600 shares at $12.10. The average purchase price was $12.11 per share.
The option to purchase 200,000 shares of common stock was awarded on October 4, 2010 under the MEMC 2001 Equity Incentive Plan in a transaction exempt under Rule 16b-3 and becomes exercisable at an exercise price of $11.76 per share in 10%, 20%, 30% and 40% increments on October 4, 2011, October 4, 2012, October 4, 2013 and October 4, 2014, respectively.