Cerebras rebounds up to 9.5% after Altman calls it a close OpenAI partner

Shares rose as much as 9.5% on October 5 after OpenAI CEO Sam Altman wrote on X on October 2 that Cerebras is a close partner with deep engagement on speed. The rebound came after a sharp selloff the prior week tied to the OpenAI Ultrafast report. The stock remained below its $185 IPO price.

• Shares up as much as 9.5% on Monday, October 5
• Altman's X post dated October 2, 2026
• Stock still below the $185 IPO price after the rebound