Cerebras Stock Falls on Lock-up Expiry and Reports of OpenAI Hardware Exclusion

Key Facts

1Cerebras Systems shares traded lower as 19.4 million shares hit the market following a lock-up expiry.

2Reports indicate that OpenAI's newly unveiled GPT-6.1 Sol Ultrafast is not running on Cerebras hardware.

Cerebras Systems shares traded lower as 19.4 million new shares entered the market following the expiration of a lock-up period. Benzinga reported that the technical pressure coincided with reports indicating that OpenAI's newly unveiled GPT-6.1 Sol Ultrafast model is not running on Cerebras hardware.

CBRS closed at $194.95 on September 29, 2026, with the stock recording a session low of $194.21 against a high of $214. This price action reflects the increased equity supply and shifting sentiment regarding major AI hardware partnerships.