[AI Chip Maker Cerebras Shares Fall Over 3% in Pre-Market Trading After Culper Research Targets Short Seller] According to Jinse Finance, on October 29th, AI chip maker Cerebras (CBRS.US) shares fell over 3% in pre-market trading, reaching $109.13. The stock closed down 5.66% yesterday. In related news, short-selling firm Culper Research disclosed a short position in Cerebras Systems and released a critical report questioning the durability and underlying technology of the AI chip maker's flagship wafer-level engine. The core argument of the Culper report is that Cerebras' large-scale chips have a functional lifespan of only 1.5 to 2.5 years in actual use, a limitation that fundamentally undermines the company's business model.