Cerebras Just Rocketed Onto the Nasdaq. The Biggest IPO of 2026 Isn’t a Buy Here.

The AI infrastructure boom just delivered its loudest market debut yet. Cerebras Systems (CBRS), the chipmaker behind a processor roughly the size of a dinner plate, began trading on May 14 under the CBRS ticker. But CBRS stock didn’t just open — it exploded. After pricing at $185 following two upward revisions to its initial public offering (IPO) range, shares began trading at $350 and finished the session at $311.07, giving the company a market value of roughly $95 billion. The $5.55 billion raise instantly became the largest IPO of 2026, surpassing every other listing this year.

The AI chip sector has been surging for months, with semiconductor exchange-traded funds (ETFs) delivering triple-digit gains as hyperscalers and AI labs race to secure more computing power. Cerebras is stepping directly into that momentum, claiming inference speeds up to 15 times faster than traditional GPU clusters.