GT Advanced Technologies Inc. (GTAT) was a diversified technology company known for its crystal growth equipment and advanced materials, primarily sapphire and silicon carbide (SiC). Historically, GTAT provided equipment and solutions for the solar, LED, and electronics industries. The company gained significant attention for a major deal with Apple to produce sapphire glass, but subsequently filed for Chapter 11 bankruptcy in 2014. After restructuring, GTAT focused on silicon carbide and sapphire materials. In August 2021, ON Semiconductor (now onsemi) announced the acquisition of GT Advanced Technologies for $415 million, integrating GTAT's expertise in SiC crystal growth to bolster onsemi's capabilities in intelligent power and sensing solutions, particularly for electric vehicles, EV charging, and energy infrastructure.
The Merrimack facility, formerly GTAT's HQ, now serves as a crucial site for onsemi's silicon carbide (SiC) crystal growth, research and development, and manufacturing operations. It supports the production of SiC wafers for power electronics.
Advanced crystal growth furnaces, state-of-the-art metrology and characterization labs for SiC and sapphire materials. The facility is designed for high-volume production of advanced materials.
As part of onsemi, the work culture emphasizes innovation, collaboration, and quality in the development and manufacturing of cutting-edge semiconductor materials. It likely retains a strong engineering and research focus inherited from GTAT.
This location is significant for its role in advancing SiC technology, which is critical for next-generation power electronics in electric vehicles, renewable energy, and industrial applications. It represents a key part of onsemi's vertical integration strategy for SiC.
Historically, GT Advanced Technologies had a global presence supporting its sales, service, and manufacturing operations, particularly in North America, Europe, and Asia. Key functions included direct sales, field service engineering for its crystal growth systems, and supply chain management for its materials business. This global footprint is now integrated into onsemi's much larger worldwide operations, which include design centers, manufacturing facilities, and sales offices across the globe.
243 Daniel Webster Hwy
Merrimack
New Hampshire
USA
Address: Unavailable (Historically a key manufacturing and R&D site, especially for sapphire furnaces)
Served as a primary hub for GTAT's sapphire furnace business, supporting global customers in the LED, consumer electronics, and specialty materials markets.
Address: Unavailable (Historically a sales and support office)
Facilitated business development, customer relationship management, and technical support for the Asian market, crucial for the company's global reach.
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As of April 2025, GT Advanced Technologies' leadership includes:
GT Advanced Technologies has been backed by several prominent investors over the years, including:
GT Advanced Technologies was acquired by onsemi in October 2021. As such, specific executive movements for 'GT Advanced Technologies' as a standalone entity are no longer applicable. Any relevant leadership changes would be within onsemi's corporate structure.
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Historically, GT Advanced Technologies likely used common corporate email formats. Since its acquisition by onsemi, any active email addresses for former GTAT personnel now integrated into onsemi would follow onsemi's email format.
Historical: [first].[last]@gtat.com or [first_initial][last]@gtat.com. Current (as part of onsemi): [first].[last]@onsemi.com
Format
example.name@onsemi.com
Example
75 (for onsemi.com format, assuming a valid employee)%
Success rate
onsemi • August 26, 2021
onsemi (Nasdaq: ON) today announced it has entered into a definitive agreement to acquire GT Advanced Technologies (GTAT), a producer of silicon carbide (SiC). The acquisition will enhance onsemi's ability to secure and grow supply of SiC and meet rapidly growing customer demand for SiC-based solutions in sustainable ecosystem....more
Reuters • October 6, 2014
GT Advanced Technologies Inc, a U.S. supplier of sapphire material to Apple Inc, filed for bankruptcy protection on Monday, a surprising Cmove that wiped out nearly all of the company's stock market value....more
onsemi • November 1, 2021
onsemi (Nasdaq: ON) today announced that it has completed its acquisition of GT Advanced Technologies (GTAT), a producer of silicon carbide (SiC). This acquisition enhances onsemi’s leadership in SiC and supports the company’s commitment to invest in disruptive, high-growth technologies....more
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