PSI is trading 3.41% down at $144.23, with semiconductor weakness a plausible factor. - Monday premarket coverage linked chipmaker weakness to AI-spending concerns and memory-chip competition; the iShares Semiconductor ETF was down 1.5%. - PSI tracks U.S. semiconductor companies; major U.S. indexes were near flat. - Tesla’s proposed Texas chip plant with Intel was not reported as a direct cause. PSI is an ETF, and no reliable live volume figure was found.