Culper Short Report Claims Cerebras Chips Fail in 18-30 Months, Flags Accounting and OpenAI Deal Risk
CBRS is trading near its 52-week low of $106.13 (1.5% above the low).
Summary
Culper Research published a short report Wednesday claiming Cerebras' wafer-scale processors break down after 18 to 30 months in service, arguing the lifespan undermines the business model. The firm says the thermal-expansion fix CEO Andrew Feldman described as invented in-house is actually PariPoser, a material developed at Bell Labs in the 1980s, and alleges Cerebras runs filler computations to keep wafers from cooling. Culper also attacks the accounting: it says the April 2026 S-1 stretched the assumed useful life of its computers to 3 to 5 years from 1.5 to 3 years without explanation, and recalculates first-half gross margin at 24.0% versus the 29.9% reported using a 2.25-year life. On the December 2025 OpenAI agreement, Culper estimates OpenAI pays 20% to 77% less than hardware buyers, putting the contract's value anywhere from roughly even to a negative net present value of $13.8 billion. Share supply adds pressure: 19.4 million shares became eligible for sale Wednesday, more than 50 million more become tradable in early November, and insiders have cashed out over $400 million since the IPO. Shares were down 5.20% at $113.11, near the 52-week low of $106.13. Note that some evidence comes from unnamed ex-staff and customers and Culper labels its conclusions opinions; Cerebras did not immediately respond to a request for comment.
At the time of this announcement, CBRS was trading at $107.74 on NASDAQ in the Technology sector, with a market capitalization of approximately $24.1B. The 52-week trading range was $106.13 to $386.34. This news item was assessed with negative market sentiment and an importance score of 8 out of 10. Source: Benzinga.