Tuesday, September 22

The Nasdaq’s record close quickly gave way to a broad repricing of duration risk. Stronger-than-expected manufacturing data lifted the 10-year Treasury yield roughly 14 basis points to around 5.08%, with an intraday peak near 5.12%, its highest level since 2007. The move pushed the Nasdaq down about 0.9%, the S&P 500 0.7%, and the Dow 0.5%.

That reversal undercut the prior session’s AI-led strength, when chip stocks including SanDisk and Micron rallied and the Nasdaq gained 0.45%. The dollar rose to roughly 101 on the Dollar Index, while the euro fell below $1.14. Higher yields and a stronger dollar also pressured gold and bitcoin, with gold down about 1.2% and bitcoin retreating toward $84,500. The message was less about a single data point than about how quickly expensive, long-duration assets can lose support when growth and inflation expectations lift the far end of the curve.

Oil supplied the geopolitical catalyst behind the market’s inflation concern, even as prices sent conflicting signals during the period. Brent fell about 2% to $98.30 and WTI declined 0.6% to $94.59 on September 22 as reports pointed to improving Middle East flows. Later coverage put Brent back above $100 as traders assessed the risk that the U.S.–Iran conflict and possible restrictions on diesel exports could tighten global supply.

That volatility matters because an energy shock would complicate the market’s already sharper focus on inflation and Treasury yields. Diplomatic efforts to improve crude flows and end the conflict therefore became a direct macro variable, not merely a geopolitical backdrop. Planned U.S.–China leadership talks and President Trump’s United Nations address were also on the calendar, but the Iran conflict remained the more immediate risk to oil, inflation expectations, and sovereign bonds.