When a hot IPO opens, there’s a certain energy on the trading floor, and on May 14, Cerebras Systems delivered just that. Before anyone had a chance to process what was happening, the stock, which was listed under the ticker CBRS, opened close to $350 per share at a price of $185. By the end of that first session, it was up about 68%, at $311. The question of whether it made sense was already being debated by professionals who study these topics.
Naturally, it didn’t last. Seldom do these things. The stock had dropped to $279.72 by Friday’s close, losing an additional 10% in a single day. Looking back, the difference between the opening exuberance and the somber afternoon math seemed almost foreseeable. With the offering, Cerebras raised roughly $5.55 billion, making it the largest U.S. IPO of the year. The market’s desire for a new brand in the AI hardware story is evident from that figure alone.
It’s not just the size of the raise that makes Cerebras intriguing. It’s the wager beneath it. The Sunnyvale company produces wafer-scale chips, which are processors that use a much bigger silicon slab than Nvidia’s graphics cards. For years, it appeared to be the kind of engineering concept that receives praise at conferences but struggles in the marketplace. It’s an unusual approach, almost stubbornly so. These days, revenue presents a different picture. In 2025, the company reported $510 million, compared to about $290 million the previous year. That kind of growth explains the appetite. The cost isn’t always justified by it.
And the whole point of contention is the cost. Investors valued Cerebras at nearly $60 billion on the first day, which is a multiple of trailing revenue and virtually eliminates any possibility of mistakes. Reading both the Reddit threads and the analyst notes gives the impression that everyone is aware of this and is still making purchases. Waiting for a drop was the wise course of action, according to one Seeking Alpha article. The advice that received the most votes on r/stocks was even more direct: don’t touch an IPO on the secondary market unless it drops below the offer price. People are familiar with the script. They simply like to watch it unfold.
Then there’s Cathie Wood, whose ARK funds made a subtly significant contribution. They acquired shares of Cerebras while trimming Advanced Micro Devices and Taiwan Semiconductor; the largest reported purchase was for roughly 149,000 shares, or $46 million. Although it would be tempting to interpret this as a judgment on AMD, that is most likely incorrect. It appears to be a preference for a sharper, cleaner narrative over a more expansive, well-established one. It’s something you only discover later, whether it’s wisdom or a willingness to take risks.
The early backers’ numbers are nearly ridiculous. Eclipse Ventures invested $6.5 million in Cerebras ten years ago, and today it has an estimated $2.5 billion stake in the company—a 385x return. Ten years ago, you were the odd one out in venture circles if you bet on hardware rather than software. Benchmark reportedly achieved a more modest 12x return, while Foundation Capital reportedly achieved a 76x return. As you watch this play out, it’s difficult not to have a little respect for those who remained out of style long enough to be correct.
However, none of that answers the important question. The bull case is self-evident: AI models continue to cost more to operate, data centers require more specialized silicon, and consumers might want alternatives to the leading provider. Customer concentration, supply limitations, competition from firms with larger budgets, and genuine uncertainty about the duration of the AI spending wave are all real risk factors. More will be revealed by the first actual earnings report than by any opening-day chart. Until then, CBRS is more of a test of the market’s continued faith than a stock.
