Shares of Cerebras Systems slid 11% to $201.80 after the AI chipmaker's debut quarterly report delivered blockbuster revenue but spooked investors with a margin warning and an earnings-per-share miss. Revenue almost doubled in the company's first report since its May IPO, but the stock fell sharply in extended trading as the company forecast a drop in its gross margin. The selloff landed on top of a brutal day for the sector: the Philadelphia Semiconductor Index tumbled 7.9% as fears over debt-funded AI spending and hawkish Fed signals swept through chip stocks.

  • Revenue Nearly Doubled, But It Wasn't Enough to Hold the Stock

First-quarter revenue totaled $193.4 million, marking a 94% increase from the year-ago period and comfortably beating analyst consensus of $181 million.

For Q2, Cerebras projects core revenue of approximately $194 million, above the Street's $177.7 million estimate. Yet the stock dropped because growth alone does not justify a valuation that entered the print at roughly 90 times sales.

  • The Margin Squeeze Is the Real Story

Cerebras expects Q2 gross margins — the profit left after covering production costs — to land between 36% and 38%, a notable decline from the 47% core gross margin recorded in Q1.

The pressure is partly tied to Cerebras' rapid infrastructure buildout; management said temporary third-party capacity costs are weighing on cloud and services margins as it races to fulfill its $20 billion-plus OpenAI contract. The CFO said the company believes it can reach long-term targets of about 60% gross margin and 40% operating margin — but that is a distant promise against near-term compression.

  • Massive Deals Create Concentration Risk

Cerebras is heavily dependent on a very small number of buyers; two clients accounted for approximately 86% of 2025 revenue. The OpenAI and AWS partnerships broaden the roster, but a $20 billion agreement sounds enormous while investors still need to see deployment schedules, revenue recognition and margin behavior over more than one quarter.

  • Short Sellers and a Sector Storm Add Fuel

Short interest, last reported at 17.15% of float as of May 29, 2026, means any negative analyst revisions could amplify selling pressure.

One portfolio manager noted that "news lately about AI raises questions about all the spending that's being done," framing Cerebras' selloff as part of a broader reckoning with AI infrastructure valuations, not just a single-stock event.