On February 27, 2013, GT Advanced Technologies Inc. (the "Company") issued a press release announcing financial results for the fourth quarter and calendar year -ended December 31, 2012. The full text of the press release issued in connection with the announcement is furnished as Exhibit 99.1 to this Current Report on Form 8-K. The information in Exhibit 99.1 is being provided pursuant to Item 2.02 of Form 8-K and is incorporated herein by reference. A copy of the Company's Investor Financial Summary for the fourth quarter and calendar year ended December 31, 2012 is attached hereto as Exhibit 99.2 and is incorporated herein by reference.

The registrant hereby furnishes the information set forth in the press release issued on February 27, 2013 and the Investor Financial Summary for the fourth quarter and calendar year ended December 31, 2012, copies of which are attached hereto as Exhibit 99.1 and Exhibit 99.2, respectively, and each is incorporated herein by reference.

The information, including Exhibit 99.1 and Exhibit 99.2, furnished in this Current Report on Form 8-K is not deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section. Registration statements or other documents filed with the Securities and Exchange Commission shall not incorporate this information by reference, except as otherwise expressly stated in such filing.

(d) Exhibits

Exhibit No. Description

99.1        Press release issued February 27, 2013

99.2        Fourth Quarter and Calendar Year 2012 GT Advanced Technologies Inc.
            Investor Financial Summary.