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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1394954	Gt Solar International Inc.	SOLR	Semiconductors & Related Devices (3674)	030606749

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1437637	W David Keck	Gt Solar International, Inc. 243 Daniel Webster Highway Merrimack NH 03054	Vice President Gm Polysilicon	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, Par Value $.01	Acquisiton	2010-12-12	26,250	$0.00	49,893	No	4	M	Direct
Common Stock, Par Value $.01	Disposition	2010-12-12	8,754	$9.10	41,139	No	4	F	Direct
Common Stock, Par Value $.01	Acquisiton	2010-12-13	6,282	$5.64	47,421	No	4	M	Direct
Common Stock, Par Value $.01	Acquisiton	2010-12-13	12,901	$4.81	60,322	No	4	M	Direct
Common Stock, Par Value $.01	Disposition	2010-12-13	31,005	$9.43	29,317	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	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock, Par Value $.01	Restricted Stock Unit	Disposition	2010-12-12	26,250	$0.00	26,250	$0.00
Common Stock, Par Value $.01	Stock Option	Disposition	2010-12-13	6,282	$0.00	6,282	$5.64
Common Stock, Par Value $.01	Stock Option	Disposition	2010-12-13	12,901	$0.00	12,901	$4.81

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
52,500		No	4	M	Direct
94,222	2017-12-21	No	4	M	Direct
69,664	2019-09-01	No	4	M	Direct

Footnotes

These shares were withheld to satisfy the reporting person's tax withholding obligations upon the vesting of restricted stock units on December 12, 2010.
The price represents the weighted average purchase price for multiple transactions reported on this line. The prices of the transactions reported on this line range from $9.39 to $9.43. The reporting person undertakes to provide, upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
Each restricted stock unit represents the right to receive one share of common stock of GT Solar International, Inc.
The restricted stock units vest in four equal installments beginning December 12, 2010. Shares of common stock are delivered to the reporting person on vesting.
Of these options, one fourth vested on December 21, 2008, the first anniversary of the date of grant, and the balance vest in equal monthly installments of 1/48th of total each month subsequent to December 2008.
Of these options, one fourth vested on September 1, 2010, the first anniversary of the date of grant, and the balance vest in equal monthly installments of 1/48th of total each month subsequent to September 2010.