Stocks opened September on the back foot as renewed U.S.-Iran hostilities in the Strait of Hormuz hit oil and bond markets, and equities never got a real bid back.
The session traded heavy from the open: S&P 500 down roughly half a percent, Nasdaq underperforming by nearly a point as mega-cap tech (Nvidia, Alphabet) led losses, and the Dow holding up relatively better on defensive weight. WTI ripped toward $88 and Brent pushed above $92 after two tankers were struck overnight, while the 10-year yield pressed toward 4.77-4.80%, its highest since early 2025. That combination — oil shock plus a hawkish Fed repricing after the new Chair's Jackson Hole inflation warning pushed September hike odds above 55% — is the stagflation trade book desks have been positioning for since August. VIX popped off its sub-15 monthly close into the 15-16 handle, still contained but no longer complacent.
Leadership flipped defensive: energy, healthcare and staples outperformed while communication services held up better than the broader tech complex; XLK and industrials were the session's laggards. Breadth was soft with lows outnumbering highs, Nike and travel/leisure names among the 52-week-low list, a tell that the rotation out of cyclicals is more than one-day noise. Price closed below the prior gamma flip zone, trading like dealers are net short gamma into the data-heavy back half of the week — expect chop to be amplified, not dampened.
The risk: oil and the Strait of Hormuz headline flow. Any further tanker strikes or supply disruption keeps yields elevated and forces the hike-odds repricing higher, which is the mechanism that turns this from a rotation into a real drawdown. ADP prints tomorrow, Broadcom reports after the close, and Friday's jobs report is the swing factor for whether the Fed narrative holds or reverses.