AXT Inc's stock soared 10.65% in intraday and after-hours trading on Tuesday, driven by a combination of positive investor sentiment regarding the company's position in the AI infrastructure market and the announcement of its upcoming earnings release.

The movement reflects growing optimism around demand for indium phosphide substrates, where AXT holds a leading market share of approximately 40%. The company is a key supplier for high-speed data center connectivity and AI infrastructure, with expectations of sharp revenue growth as export permit headwinds ease and manufacturing capacity utilization improves. Furthermore, the company's recent proposal to increase its authorized common shares from 70 million to 120 million signals potential growth initiatives and capital raising plans to support expansion.

Additionally, the scheduling of the company's first quarter 2026 financial results announcement for April 30, 2026, has generated positive investor anticipation, contributing to the stock's upward momentum in after-hours trading.