SCHEDULE 13G

Amendment No. 2
GT ADVANCED TECHNOLOGIES INC
Common Stock
Cusip #36191U106


Cusip #36191U106
Item 1:	Reporting Person - FMR LLC
Item 4:	Delaware
Item 5:	6,694,963
Item 6:	0
Item 7:	20,845,988
Item 8:	0
Item 9:	20,845,988
Item 11:	13.376%
Item 12:	    HC


Cusip #36191U106
Item 1:	Reporting Person - Edward C. Johnson 3d
Item 4:	United States of America
Item 5:	0
Item 6:	0
Item 7:	20,845,988
Item 8:	0
Item 9:	20,845,988
Item 11:	13.376%
Item 12:	IN




	SCHEDULE 13G - TO BE INCLUDED IN
STATEMENTS
	FILED PURSUANT TO RULE 13d-1(c)



Item 1(a).	Name of Issuer:

		GT ADVANCED TECHNOLOGIES
INC

Item 1(b).	Name of Issuer's Principal Executive Offices:

		243 DANIEL WEBSTER HIGHWAY
		MERRIMACK, NH  03054
		USA

Item 2(a).	Name of Person Filing:

		FMR LLC

Item 2(b).	Address or Principal Business Office or, if None,
Residence:

		245 Summer Street, Boston,
Massachusetts  02210

Item 2(c).	Citizenship:

		Not applicable

Item 2(d).	Title of Class of Securities:

		Common Stock

Item 2(e).	CUSIP Number:

		36191U106

Item 3.	This statement is filed pursuant to Rule 13d-1(c)

Item 4.	Ownership

	(a)	Amount Beneficially Owned:	20,845,988

	(b)	Percent of Class:	13.376%

	(c)	Number of shares as to which such
person has:

	(i)	sole power to vote or to direct
the vote:	6,694,963

	(ii)	shared power to vote or to
direct the vote:	0

	(iii)	sole power to dispose or to
direct the disposition of:	20,845,988

	(iv)	shared power to dispose or to
direct the disposition of:	0



Item 5.	Ownership of Five Percent or Less of a Class.

	Not applicable.

Item 6.	Ownership of More than Five Percent on Behalf of Another
Person.

	Various persons have the right to receive or the power to
direct the receipt of dividends from, or the proceeds from the
sale of, the Common Stock of GT ADVANCED
TECHNOLOGIES INC.  No one person's interest in the
Common Stock of GT ADVANCED TECHNOLOGIES INC
is more than five percent of the total outstanding Common
Stock.

Item 7.	Identification and Classification of the Subsidiary Which
Acquired the Security Being Reported on By the Parent
Holding Company.

	See attached Exhibit A.

Item 8.	Identification and Classification of Members of
the Group.

	Not applicable.  See attached Exhibit A.

Item 9.	Notice of Dissolution of Group.

	Not applicable.

Item 10.	Certification.

	By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired in the
ordinary course of business and were not acquired for the
purpose of and do not have the effect of changing or
influencing the control of the issuer of such securities and
were not acquired in connection with or as a participant in any
transaction having such purpose or effect.

Signature

	After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this statement
is true, complete and correct.

February 13, 2014
Date

 /s/ Scott C. Goebel
Signature

Scott C. Goebel
Duly authorized under Power of Attorney
effective as of June 1, 2008 by and on behalf of FMR LLC
and its direct and indirect  subsidiaries


	SCHEDULE 13G - TO BE INCLUDED IN
STATEMENTS
	FILED PURSUANT TO RULE 13d-1(c)



	Pursuant to the instructions in Item 7 of Schedule 13G,
Fidelity Management & Research Company ("Fidelity"), 245
Summer Street, Boston, Massachusetts 02210, a wholly-
owned subsidiary of FMR LLC and an investment adviser
registered under Section 203 of the Investment Advisers Act
of 1940, is the beneficial owner of 13,563,381 shares or
8.703% of the Common Stock outstanding of GT
ADVANCED TECHNOLOGIES INC  ("the Company") as a
result of acting as investment adviser to various investment
companies registered under Section 8 of the Investment
Company Act of 1940. The number of shares of Common
Stock of GT ADVANCED TECHNOLOGIES INC owned by
the investment companies at December 31, 2013 included
6,564,403 shares of Common Stock resulting from the
assumed conversion of $50,605,000 principal amount of GT
ADVANCED TECH CV 3% 10/1/17 (129.7185 shares of
Common Stock for each $1,000 principal amount of
debenture). The number of shares of Common Stock of GT
ADVANCED TECHNOLOGIES INC owned by the
investment companies at December 31, 2013 included 426,590
shares of Common Stock resulting from the assumed
conversion of $3,690,000 principal amount of GT
ADVANCED TECH CV 3 12/15/20 (115.606936 shares of
Common Stock for each $1,000 principal amount of
debenture).

	Edward C. Johnson 3d and FMR LLC, through its
control of Fidelity, and the funds each has sole power to
dispose of the 13,563,381 shares owned by the Funds.

	Fidelity SelectCo, LLC ("SelectCo"), 1225 17th Street,
Suite 1100, Denver, Colorado 80202, a wholly-owned
subsidiary of FMR LLC and an investment adviser registered
under Section 203 of the Investment Advisers Act of 1940, is
the beneficial owner of 92,140 shares or 0.059% of the
Common Stock outstanding of GT ADVANCED
TECHNOLOGIES INC ("the Company") as a result of acting
as investment adviser to various investment companies
registered under Section 8 of the Investment Company Act of
1940 (the "SelectCo Funds").

	Edward C. Johnson 3d and FMR LLC, through its
control of SelectCo, and the SelectCo Funds each has sole
power to dispose of the 92,140 owned by the SelectCo Funds.

	Members of the family of Edward C. Johnson 3d,
Chairman of FMR LLC, are the predominant owners, directly
or through trusts, of Series B voting common shares of FMR
LLC, representing 49% of the voting power of FMR LLC.
The Johnson family group and all other Series B shareholders
have entered into a shareholders' voting agreement under
which all Series B voting common shares will be voted in
accordance with the majority vote of Series B voting common
shares.  Accordingly, through their ownership of voting
common shares and the execution of the shareholders' voting
agreement, members of the Johnson family may be deemed,
under the Investment Company Act of 1940, to form a
controlling group with respect to FMR LLC.

	Neither FMR LLC nor Edward C. Johnson 3d,
Chairman of FMR LLC, has the sole power to vote or direct
the voting of the shares owned directly by the Fidelity Funds,
which power resides with the Funds' Boards of Trustees.
Fidelity carries out the voting of the shares under written
guidelines established by the Funds' Boards of Trustees.

	Pyramis Global Advisors, LLC ("PGALLC"), 900
Salem Street, Smithfield, Rhode Island, 02917, an indirect
wholly-owned subsidiary of FMR LLC and an investment
adviser registered under Section 203 of the Investment
Advisers Act of 1940, is the beneficial owner of 5,141,809
shares or 3.299% of the outstanding Common Stock of GT
ADVANCED TECHNOLOGIES INC as a result of its serving
as investment adviser to institutional accounts, non-U.S.
mutual funds, or investment companies registered under
Section 8 of the Investment Company Act of 1940 owning
such shares. The number of shares of Common Stock of GT
ADVANCED TECHNOLOGIES INC owned by the
institutional account(s) at December 31, 2013 included
3,779,348 shares of Common Stock resulting from the
assumed conversion of $29,135,000 principal amount of GT
ADVANCED TECH CV 3% 10/1/17 (129.7185 shares of
Common Stock for each $1,000 principal amount of
debenture). The number of shares of Common Stock of GT
ADVANCED TECHNOLOGIES INC owned by the
institutional account(s) at December 31, 2013 included
979,191 shares of Common Stock resulting from the assumed
conversion of $8,470,000 principal amount of GT
ADVANCED TECH CV 3 12/15/20 (115.606936 shares of
Common Stock for each $1,000 principal amount of
debenture).

	Edward C. Johnson 3d and FMR LLC, through its
control of PGALLC, each has sole dispositive power over
5,141,809 shares and sole power to vote or to direct the voting
of 5,141,809 shares of Common Stock owned by the
institutional accounts or funds advised by PGALLC as
reported above.

	Pyramis Global Advisors Trust Company ("PGATC"),
900 Salem Street, Smithfield, Rhode Island, 02917, an indirect
wholly-owned subsidiary of FMR LLC and a bank as defined
in Section 3(a)(6) of the Securities Exchange Act of 1934, is
the beneficial owner of 505,881 shares or 0.325% of the
outstanding Common Stock of the GT ADVANCED
TECHNOLOGIES INC as a result of its serving as investment
manager of institutional accounts owning such shares. The
number of shares of Common Stock of GT ADVANCED
TECHNOLOGIES INC owned by the institutional account(s)
at December 31, 2013 included 293,164 shares of Common
Stock resulting from the assumed conversion of $2,260,000
principal amount of GT ADVANCED TECH CV 3% 10/1/17
(129.7185 shares of Common Stock for each $1,000 principal
amount of debenture). The number of shares of Common
Stock of GT ADVANCED TECHNOLOGIES INC owned by
the institutional account(s) at December 31, 2013 included
212,717 shares of Common Stock resulting from the assumed
conversion of $1,840,000 principal amount of GT
ADVANCED TECH CV 3 12/15/20 (115.606936 shares of
Common Stock for each $1,000 principal amount of
debenture).

	Edward C. Johnson 3d and FMR LLC, through its
control of Pyramis Global Advisors Trust Company, each has
sole dispositive power over 505,881 shares and sole power to
vote or to direct the voting of 0 shares of Common Stock
owned by the institutional accounts managed by PGATC as
reported above.

	Crosby Advisors LLC, 11 Keewaydin Drive, Suite 200,
Salem, New Hampshire, 03079, a wholly-owned subsidiary of
Crosby Company of New Hampshire LLC ("CCNH"), is the
beneficial owner of 1,542,777 shares or 0.990% of the
Common Stock outstanding of GT ADVANCED
TECHNOLOGIES INC ("the Company") as a result of
providing investment advisory services to individuals, trusts
and limited liability entities.  Members of the family of
Edward C. Johnson 3d, Chairman of FMR LLC, directly or
indirectly, own CCNH.



	SCHEDULE 13G - TO BE INCLUDED IN
STATEMENTS
	FILED PURSUANT TO RULE 13d-1(c)
	RULE 13d-1(f)(1)  AGREEMENT

	The undersigned persons, on February 13, 2014, agree
and consent to the joint filing on their behalf of this Schedule
13G in connection with their beneficial ownership of the
Common Stock of GT ADVANCED TECHNOLOGIES INC
at December 31, 2013.

	FMR LLC

	By /s/ Scott C. Goebel
	Scott C. Goebel
	Duly authorized under Power of Attorney effective as
of June 1, 2008, by and on behalf of FMR LLC and its direct
and indirect subsidiaries

	Edward C. Johnson 3d

	By /s/ Scott C. Goebel
	Scott C. Goebel
	Duly authorized under Power of Attorney effective as
of June 1, 2008, by and on behalf of Edward C. Johnson 3d

	Fidelity Management & Research Company

	By /s/ Scott C. Goebel
	Scott C. Goebel
	Senior V.P. and General Counsel