Leopold Aschenbrenner's firm Situational Awareness has been buying options positions in stocks including Advanced Micro Devices (AMD), Bloom Energy, Coreweave, SK Hynix and SanDisk, sources told CNBC. This marks his reentry to public markets after his hedge fund's assets fell to about $10 billion from a peak of over $45 billion earlier this summer, following a rapid decline in AI-related stocks he was buying with leverage. The firm was forced to unwind its public equity positions to Ken Griffin's Citadel in a fire sale to stave off a collapse, though it held onto stakes in private companies like Anthropic. The recent options moves were made late last week and early this week.