Cerebras shares slide as OpenAI exposure weighs on AI-chip maker

what happened

Barron's reported in a story by Anita Hamilton that shares of AI-chip maker Cerebras fell sharply on Monday, trading below half the level of their first closing price after the company began trading in May. The stock had been among the hottest initial public offerings of 2026, rising nearly 70% on its opening day. By midday, it stood near $148.07 and was heading toward its lowest closing level on record.

Cerebras depends heavily on selling its wafers to OpenAI. The customer is reportedly favoring Nvidia chips for its newest GPT6.1 Sol AI model. A broader retreat across chip stocks added to the pressure: the iShares Semiconductor ETF declined 2% on Monday, while Nvidia, Micron and AMD also traded lower. Cerebras shares themselves were down 10%.

Concerns intensified after a report late last week said OpenAI's recurring revenue could come in below expectations, raising questions about the strength of the market. At the end of last year, Cerebras had a contracted-order backlog of $24.6 billion, with $20 billion linked to its OpenAI agreement, making the company its largest customer by revenue backlog. Earlier in October, the stock briefly rose after OpenAI's CEO described Cerebras as a "close partner" amid debate over Nvidia chips, but that rebound did not last.

why it matters

Cerebras has unusually high exposure to one customer: $20 billion of its $24.6 billion backlog was tied to OpenAI at the end of last year, making OpenAI-related developments important for the stock.

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