This press release shall not constitute an offer to sell or a solicitation of an offer to buy these securities, nor shall there be any sale of these securities, in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.UBS Investment Bank, BofA Merrill Lynch and Credit Suisse will act as joint book-running managers for the offering. The issuer has filed a registration statement (including a base prospectus and related preliminary prospectus supplement) with the Securities and Exchange Commission, or SEC, for the offering. Before you invest, you should read the preliminary prospectus supplement, the accompanying prospectus and the other documents the issuer has filed with the SEC for more complete information about the issuer and the offering. You may get these documents for free by visiting EDGAR on the SEC web site at www.sec.gov. Alternatively, the issuer, the underwriters or any dealer participating in the offering will arrange to send you the preliminary prospectus supplement and the accompanying prospectus if you request them by contacting UBS Investment Bank, Attn: Prospectus Department, 299 Park Avenue, New York, NY 10171 or by calling (888) 827-7275, by contacting BofA Merrill Lynch, Attn: Prospectus Department, 222 Broadway, 7th Floor, New York, NY 10038, by calling (866) 500-5408 or by emailing email@example.com or by contacting Credit Suisse Securities (USA) LLC, Attn: Prospectus Department, One Madison Avenue, New York, NY 10010, by calling (800) 221-1037 or by emailing firstname.lastname@example.org. About GT Advanced Technologies Inc. GT Advanced Technologies Inc. is a global provider of polysilicon production technology, and sapphire and silicon crystalline growth systems and materials for the solar, LED and other specialty markets. The company's products and services allow its customers to optimize their manufacturing environments and lower their cost of ownership. For additional information please visit www.gtat.com. Forward-Looking Statements This press release contains forward-looking statements regarding our planned offer and sale of senior convertible notes and the use of the net proceeds from any such sale. We cannot be sure that we will complete the offering or, if we do, on what terms we will complete it. Forward-looking statements are based on current beliefs and expectations and are subject to inherent risks and uncertainties, including those discussed under the caption “Risk Factors” in the prospectus and prospectus supplement. In addition, management retains broad discretion with respect to the allocation of the net proceeds of this offering. The forward-looking statements speak only as of the date of this release, and GT Advanced Technologies Inc. is under no obligation to, and expressly disclaims any such obligation to, update or alter its forward-looking statements, whether as a result of new information, future events, or otherwise.