TCAI is trading 1.99% down at $46.18 after closing at $47.12 on September 29; no TCAI-specific after-hours announcement was identified. - The ETF holds AI infrastructure names including Micron, Vertiv and SanDisk. - Recent reporting described pressure on AI hardware stocks after OpenAI halted work on its GPT-6.1 Astra model. This sector backdrop may be relevant, but available evidence does not establish it as the direct cause of the move.