Stocks Post Relief Rally as Core CPI Plunges to 64-Month Low: Sept. 11, 2026 — 2026-09-11
What moved & why: Stocks staged a relief rally—first gain in five sessions—on core CPI hitting a 64-month low of 2.4% y/y, offsetting a hotter-than-expected monthly print (0.3% m/m vs. 0.2% forecast). Oil finding resistance at $100 on news of Tehran-Gulf talks over Strait of Hormuz transit also bolstered risk appetite.
Cross-asset:
- Equities: All sectors and major benchmarks gained; Oracle's blockbuster earnings energized AI enthusiasm and dip-buying across tech.
- Treasuries: Bifurcated curve—short end (policy-sensitive) rose on 87% odds of a rate hike Wednesday; 10-year duration fell as buyers emerged below 5%, with 10-year touching 4.992% intraday before retreating to 4.91%.
- Dollar: Unchanged.
- Oil/Commodities: WTI crude resisted at $100; cyclical commodities, precious metals, and cryptocurrencies jumped materially.
- Volatility: Traders dropped volatility protection; gravitated to prediction markets, especially contracts tied to next week's central bank decision.
Econ / Fed angle: August headline CPI climbed 0.4% m/m and 3.4% y/y (vs. 0.1% and 3.4% in July), driven by escalating US-Iran hostilities pushing fuel costs higher. Core's 2.4% y/y print signals underlying inflation near the Fed's 2% target absent geopolitical conflict. UMich Consumer Sentiment Index plunged to 47.8 (vs. 51.7 prior, well below 51 forecast), reflecting gasoline costs, higher rates, and market volatility; 1- and 5-year inflation expectations rose to 4.6% and 3.4%. Market expects Chair Warsh to deliver a 25 bp hike Wednesday; a rate increase would likely flatten the curve as duration responds positively to inflation-fighting discipline.
Watch next: Fed decision Wednesday; trajectory of WTI crude (staying below $100 critical to avoiding a "5-handle" on 10-year yields); geopolitical resolution between US and Iran; UK GDP, trade, and inflation data; Japan's Producer Price Index trends.