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Cerebras Systems stock tumbled roughly 20% for the week, hitting a new post-IPO low, as the AI chipmaker faced competitive pressure from Nvidia and a wave of selling tied to the expiration of its IPO lockup period. The decline highlights investor skepticism about challengers to Nvidia's dominance in AI computing hardware. The lockup expiration freed up large blocks of insider shares for sale, compounding downward pressure on the stock already under scrutiny over its ability to compete with Nvidia's entrenched position in AI chips.