The AI boom stopped being a software story the moment Big Tech started pouring concrete. Amazon (AMZN), Microsoft (MSFT), Alphabet (GOOG) (GOOGL), and Meta (META) are now expected to spend as much as $725 billion combined on capital expenditures this year. Much of that spending is flowing directly into AI infrastructure like data centers, networking hardware, advanced chips, and the materials needed to build them. That raises an important question for investors. If Nvidia (NVDA) became the face of AI, who supplies the companies supplying Nvidia? One answer may be AXT (AXTI) . The semiconductor materials maker quietly became one…
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