Monday, August 31

The U.S.–Iran flare-up around the Strait of Hormuz drove the clearest market move: Brent rose 2.7% to roughly $90.50 a barrel, briefly topping $91, while WTI climbed 2.8% to about $85.76. U.S. strikes on Iranian rocket launchers near the strait, followed by Iranian retaliation against U.S. targets in Jordan, reintroduced supply risk around a corridor handling roughly 6–8 million barrels a day.

Reuters and The Wall Street Journal framed the escalation as more than a geopolitical headline: a sustained disruption would transmit directly into global inflation and central-bank decisions. Oil’s jump also helped pressure equities and lift rate-hike expectations, making the Gulf risk a cross-asset macro shock rather than an isolated energy trade. U.S. rhetoric about a potential Venezuelan oil arrangement and replenishing the Strategic Petroleum Reserve added a possible supply-side counterweight, but those claims were not independently verified.

Treasury yields extended their post-Jackson Hole rise, with the 10-year up roughly 3.5 basis points near 4.75% and the 30-year around 5.25%, its highest level since early 2025. Mortgage rates followed, with the 30-year fixed rate near 6.87%, tightening financial conditions beyond the bond market. Futures were pricing approximately 58–60% odds of a 25-basis-point September hike, as oil near $90 reinforced concerns that inflation will remain difficult to contain.

The pressure produced only a modest equity retreat: the Dow fell about 0.7%, the S&P 500 0.3% and the Nasdaq roughly 0.1%, while small caps underperformed. August nevertheless ended strongly, with the S&P 500 up about 2.6–3% and the Nasdaq nearly 4%. Gold’s roughly $48 decline toward $4,481.50 showed the sharper repricing in real yields, while subdued VIX levels indicated that equity volatility had not yet caught up with the rates and geopolitical risks.

The AI supply chain continued shifting from expansion plans to physical buildout. SK hynix broke ground on new Indiana facilities, NVIDIA extended NVLink Fusion into the memory layer with NVHBM, and Micron opened a workforce training center. Together, the developments point to a more durable memory and interconnect capex cycle, supporting the infrastructure side of the AI investment thesis even as higher yields challenge long-duration valuations.

That enthusiasm is increasingly being viewed through a financial-stability lens. Investrade relayed warnings from Financial Stability Board Chair Andrew Bailey that frontier models, elevated AI-linked valuations and greater equity leverage could amplify asset bubbles and market disruption. NVIDIA shares fell about 4.6% in one Asia-market briefing after the hawkish rate shift, while Amazon rose roughly 3.4%, underscoring that AI exposure is no longer trading as a uniform megacap basket.