Cerebras Systems (CBRS) COO Dhiraj Mallick reportedly filed to sell $78 million of company stock; the visible SEC filing shows a sale of 38,889 shares for gross proceeds of about $8.6 million. The post says the sale would leave him with no stake and suggests it may signal declining confidence, while alleging OpenAI’s GPT-6 ultrafast does not use Cerebras Wafer Scale Engines.