Star fund manager Cathie Wood has struck again. In the very first week of AI chip company Cerebras Systems (CBRS) listing on the Nasdaq, her ARK Investment Management spent roughly $46.4 million to buy nearly 150,000 shares of the stock. The purchase came after Cerebras surged 68% on its debut day – a classic “buying the rally” move that has once again sparked heated market discussion.
Wafer Scale Chip: A Challenger to Nvidia’s Dominance?
Cerebras is not simply trying to copy Nvidia’s GPU playbook. Its core product, the Wafer Scale Engine 3, is manufactured on a full silicon wafer – 57 times larger than the biggest GPU on the market – packing 4 trillion transistors, 900,000 AI cores, and 44 gigabytes of on chip memory. The company claims it can deliver AI inference up to 15 times faster than leading GPU-based systems.
Thanks to this technological edge, Cerebras has already landed heavyweight customers. In January, OpenAI signed a multi-year compute agreement valued at more than $20 billion, committing to deploy 750 megawatts of Cerebras compute capacity through 2028. In March, Amazon AWS signed a binding term sheet, becoming the first hyper-scaler to deploy Cerebras systems in its data centers. Financially, the company generated $510 million in revenue for 2025, up 76% year over year, and swung to a net profit of $238 million – a successful turnaround. From technology to commercial traction, Cerebras has demonstrated real potential to challenge Nvidia’s near total dominance. That is the core logic behind Wood’s bold bet.
Warning Signs Behind the Halo: A Valuation That Takes Your Breath Away
For retail investors, however, following Wood into this stock right now may not be a wise move. The biggest obstacle is price. As of May 19, Cerebras shares traded around $300, giving the company a market capitalization north of $63 billion. That translates to a price-to-sales ratio of 120x and a price-to-earnings ratio of nearly 700x. For context, Nvidia trades at about 45x earnings, generates over $215 billion in trailing revenue, and is growing more than 60% year over year. Cerebras’s valuation is priced for perfection – any hiccup could trigger a sharp pullback.
Even more concerning is customer concentration risk. In 2025, two UAE-affiliated entities together accounted for 86% of Cerebras’s revenue, with Mohamed bin Zayed University of Artificial Intelligence alone responsible for 62%. Although OpenAI is set to become another major pillar, such heavy reliance on a handful of customers means that a single paused contract, budget shift, or change in export rules could dramatically shake the income statement.
Moreover, Cerebras is increasingly operating as an AI cloud provider – building or leasing data centers and running its own systems as a service – not just as a chip vendor. That model brings heavier capital requirements and execution risk, moving away from the asset light chip business.
Conclusion
Cathie Wood’s ARK funds are built around concentrated bets on disruptive technologies and a high tolerance for volatility; buying a moonshot like Cerebras fits her mandate. But for most retail investors, chasing this stock at over 120x sales – with almost no margin of safety – carries far more risk than opportunity. A better move is to put this intriguing AI chip stock on your watchlist and wait for its valuation to come down meaningfully before deciding.
