Cerebras Systems Inc. shares surged more than 100% above their IPO price when trading opened Thursday, in a blockbuster debut that underscored investors’ intense appetite for AI infrastructure companies.

The company priced its initial public offering at $185 a share Wednesday night—above an already elevated expected range—raising roughly $5.55 billion. The AI chipmaker sold 30 million shares, with underwriters holding an option to purchase an additional 4.5 million shares, according to the company.

Founded in 2016, the company is a San Francisco-based chipmaker that designs processors specifically for AI workloads. Its flagship product, the Wafer Scale Engine 3, is built on a single silicon wafer rather than the smaller chips stitched together in Nvidia’s GPUs—a design the company says delivers speed and cost advantages for AI inference. It’s a competitor for both Nvidia and AMD.

Cerebras is being watched as a bellwether for the AI-infrastructure investment cycle, as tech companies race to secure the hardware and compute capacity needed to train and run AI systems. The offering is one of the largest U.S. tech IPOs in years and is seen as a wider stress test for a wave of AI listings Wall Street is bracing for later in the year.