AXT, Inc. (AXT) is a developer and producer of compound and single element semiconductor substrates, including substrates made from gallium arsenide (GaAs), indium phosphide (InP) and germanium (Ge). It manufactures its semiconductor substrates using the vertical gradient freeze (VGF) technology. AXT manufactures its products in the People's Republic of China (PRC). It sells compound substrates manufactured from GaAs and InP, as well as single-element substrates manufactured from Ge. AXT supplies GaAs substrates in two-, three-, four-, five- and six-inch diameters. It manufactures InP substrates in two-, three-and four-inch diameters, and Ge substrates in two- and four-inch diameters.