NEW YORK — September 2, 2026 — U.S. financial markets opened September on a weaker footing as surging oil prices, rising Treasury yields and renewed geopolitical tensions increased concerns about inflation, borrowing costs and corporate profits.

The Dow Jones Industrial Average fell about 0.8%, while the S&P 500 dropped roughly 0.7% and the Nasdaq Composite declined around 1% in Tuesday's trading session. The losses marked the third consecutive decline for the major U.S. indexes.

The latest pressure came as Brent crude climbed sharply amid renewed U.S.-Iran military tensions and concerns about possible disruptions around the Strait of Hormuz, one of the world's most important oil transportation routes. Brent briefly moved above $94 a barrel, while U.S. crude also climbed above $90.

Higher Oil Prices Put U.S. Businesses on Alert

The increase in energy prices creates a new challenge for American companies already dealing with elevated financing costs.

Higher crude prices can raise expenses for transportation companies, airlines, manufacturers, retailers and logistics businesses, while also increasing costs that can eventually reach consumers through higher prices.

At the same time, the U.S. 10-year Treasury yield climbed to around 4.8%, approaching its highest level in several years. Rising government bond yields can increase borrowing costs for businesses, households and investors.

For U.S. businesses, the combination of expensive energy and higher interest rates could squeeze profit margins and make new investment more expensive.

Fed Rate Decision Becomes More Important

The market turbulence is also changing expectations for the Federal Reserve.

Investors are increasingly watching upcoming U.S. employment and inflation data for clues about whether policymakers could raise interest rates. Higher oil prices could add to inflation pressure at precisely the time when the U.S. economy is showing signs of softer labor-market conditions.

The resulting uncertainty is particularly important for companies that depend heavily on debt financing or are planning major capital investments.

Technology stocks were among those affected as higher yields reduced investor appetite for some growth-oriented companies. The market decline also showed how quickly geopolitical developments can affect U.S. corporate valuations and investor sentiment.

What U.S. Companies Are Watching Now

Businesses and investors are likely to focus on three major factors in the coming weeks: oil prices, Treasury yields and Federal Reserve policy.

If energy prices remain elevated, companies could face higher operating expenses and consumers could see additional price pressure. If Treasury yields continue rising, corporate borrowing and refinancing could become more expensive.

September has therefore begun with a difficult combination for American businesses: higher energy costs, tighter financial conditions and heightened geopolitical uncertainty.

The direction of oil prices and upcoming U.S. economic data could determine whether the market weakness remains temporary or develops into a broader concern for corporate earnings and economic growth.