Cerebras stock hits post-IPO low, tumbling 20% for the week on Nvidia pressure and lockup expiration

Cerebras Systems' stock fell nearly 20% to its lowest since its May IPO after reports that OpenAI will use Nvidia GPUs for GPT-6.1 Sol's 'Ultrafast' mode instead of Cerebras hardware. The decline is also linked to insider share lockup expirations and ongoing insider sales.