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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
1437639	F J John Tattersfield	Gt Solar International, Inc. 243 Daniel Webster Highway Merrimack NH 03054	Vice President Operations	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	31,500	$0.00	60,396	No	4	M	Direct
Common Stock, Par Value $.01	Disposition	2010-12-12	10,001	$9.10	50,395	No	4	F	Direct
Common Stock, Par Value $.01	Acquisiton	2010-12-13	8,679	$5.64	59,074	No	4	M	Direct
Common Stock, Par Value $.01	Acquisiton	2010-12-13	12,901	$4.81	71,975	No	4	M	Direct
Common Stock, Par Value $.01	Disposition	2010-12-13	33,489	$9.09	38,486	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	31,500	$0.00	31,500	$0.00
Common Stock, Par Value $.01	Stock Option	Disposition	2010-12-13	8,679	$0.00	8,679	$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
63,000		No	4	M	Direct
130,177	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.
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, 2009. Shares of common stock will be 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 vests in equal monthly installments of 1/48th of total each month subsequent to December 2008.
Of these options, one fourth vest 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.