Cerebras (NASDAQ) Stock Falls 20% Amid Nvidia Competition

Published on 10/2/2026 · Source: cnbc.com

AI Summary

Summarized by AI from the source below

Cerebras Systems Inc. (NASDAQ) stock fell nearly 20% this week, hitting a post-IPO low. This decline follows a report indicating that Nvidia will supply critical hardware for OpenAI's GPT-6.1 model, which had previously been anticipated to use Cerebras's technology. The post-IPO lockup expiration also contributed to the stock's drop as 19.4 million shares became available for sale, equating to 8% of the shares outstanding. Despite this, the stock rose 3% in after-hours trading on comments from OpenAI CEO Sam Altman, reaffirming their partnership with Cerebras.

Cerebras debuted on the Nasdaq with a $95 billion market cap but has seen its valuation decline to just over $39 billion. The company originally drew investor interest as a potential alternative to Nvidia in the AI hardware space thanks to its ASICs (application-specific integrated circuits) technology. Cerebras' chips are designed for AI inference workloads and were used through a $10 billion agreement with OpenAI. However, losing part of OpenAI's business to Nvidia raises concerns about Cerebras's future growth potential.

The matters at hand significantly impact Cerebras as insider share sales and competitive pressures weigh on investor confidence. For investors, the decline highlights the risks associated with competitive forces in the high-growth AI sector and the market impacts of large stock unlocks.

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Our take

Opinion from the Newsstocks AI desk, not investment advice

We think Cerebras confronts significant challenges given Nvidia's position in the AI hardware market. The expiration of the IPO lockup, coupled with competitive pressures, is weighing on the stock. For Cerebras to thrive, it may need to secure an equally substantial new partner or further innovate its AI solutions.

Key numbers

Weekly stock decline: 20%
Market cap post-IPO: $95 billion
Current market cap: $39 billion
Shares unlocked: 19.4 million

What could help

OpenAI CEO's comments may bolster investor confidence in the partnership.

What could hurt

Loss of business to Nvidia could significantly impact future revenues.

What to watch next

As time passes, more Cerebras shares are expected to become available in the market.

The background

Post-IPO lockups restrict insiders from selling shares for a set period. After expiration, more shares enter the market, which can impact stock price.

Questions readers ask

Why did Cerebras stock fall 20% this week?

Cerebras stock fell due to competition from Nvidia and the expiration of post-IPO lockup restrictions.

What is Cerebras' current market cap?

Cerebras' market cap is now just over $39 billion.

About NVIDIA Corporation (NVDA)

Nvidia designs the graphics and AI accelerator chips that power gaming, data centers, and the generative-AI boom, making it a bellwether for the semiconductor industry.

The Information Technology sector covers hardware, software and semiconductor companies driving the digital economy.