Ambiq Micro Inc., an Austin-based maker of ultra-low power semiconductors for artificial-intelligence devices, raised $96 million in an upsized initial public offering on the New York Stock Exchange. The company sold 4 million shares at $24 apiece, after earlier marketing a smaller deal of as few as 3 million shares. Trading under the symbol AMBQ, the stock opened at $38 and climbed as much as 102% above the offer price before paring gains to finish the session about 61% higher, giving Ambiq a market capitalization of roughly $680 million. The pop marks one of the strongest U.S. tech debuts of 2025, underscoring investor appetite for companies tied to the fast-growing edge-AI market. Founded in 2010, Ambiq supplies processors used in Samsung’s Galaxy Watch and other battery-powered devices. Its filing shows revenue rose 16% last year to $76.1 million, while its net loss narrowed by about $10.6 million. The company says more than 270 million devices now contain its chips, and it plans to extend its energy-saving SPOT technology beyond wearables to products such as vehicles and robots.