AXT ( AXTI ) is $4.25 billion material science company that develops and manufactures high-performance compound and single element semiconductor wafer substrates comprising indium phosphide (InP), gallium arsenide (GaAs) and germanium (Ge). AXT designs, develops, manufactures and distributes high-performance compound semiconductor substrates, as well as opto-electronic semiconductor devices such as high-brightness light emitting devices, and vertical cavity surface emitting lasers.
