Shares of Cerebras Systems are down 4.26% today to $142.13, as a staggered post-IPO lock-up expiration made approximately 19.4 million shares eligible for sale. The decline is further exacerbated by unresolved questions about OpenAI's hardware preferences and increased competitive pressure from Nvidia and Microsoft. This convergence of factors has driven the stock to a new 52-week low since its May 2026 IPO debut.