U.S. Stock Futures Under Fresh Pressure After Tech Selloff, Oil Climbs As Investors Weigh...

U.S. stock futures came under renewed pressure on Thursday as investors assessed rising oil prices, higher Treasury yields and escalating tensions between Washington and Tehran, adding to concerns about inflation and the outlook for interest rates.

The latest market moves came after U.S. President Donald Trump vowed to impose what he called unprecedented "economic warfare" on Iran and threatened severe financial penalties against countries that continue to support Tehran.

The escalation has added a fresh source of uncertainty for markets already unsettled by a sharp technology-led selloff earlier in the week and a surge in global government bond yields. U.S. stocks ultimately fell sharply on Thursday, with the Dow Jones Industrial Average dropping 1.3%, the S&P 500 losing 0.9% and the Nasdaq Composite declining 1%.

Oil prices were among the clearest signs of the geopolitical risk. Brent crude futures, the international benchmark, rose 1.59% to $93.08 a barrel as of 4:19 a.m. ET, while U.S. West Texas Intermediate futures for September delivery gained 1.63% to $87.23.

The gains followed Trump's warning that Washington would launch what he described as the "MOST CRUSHING ECONOMIC OPERATION EVER TAKEN AGAINST ANY COUNTRY" against Iran.

Trump said Iran had been given an opportunity to reach a deal but had failed to take it. He also threatened "TREMENDOUS Economic Consequences" against countries providing Tehran with a lifeline, including through cash transfers, currency swaps and shipping registries.

The threat reverberated through oil markets because the confrontation is unfolding around the Strait of Hormuz, one of the world's most important energy corridors. Any sustained disruption to shipping through the waterway tightens global crude supplies and pushes energy prices higher. Brent ultimately settled Thursday at $93.78 a barrel, while WTI settled at $87.83, with both benchmarks reaching their highest levels since July 24.

The United Arab Emirates added to concerns about the widening economic fallout when it said on Wednesday that it was suspending trade and financial transactions with Iran after saying it had come under fire from the Islamic Republic on Tuesday. The move could further complicate regional trade and financial flows at a time when shipping through the Strait of Hormuz remains severely disrupted.

For investors, the immediate concern is that higher oil prices could feed back into inflation. A prolonged rise in energy costs would make it harder for central banks to ease monetary policy and could force markets to price higher interest rates for longer.

U.S. technology stocks could be significantly impacted by the risk. The sector has led much of this year's equity rally, supported by enormous spending on artificial intelligence infrastructure, but technology and other growth stocks are sensitive to rising bond yields because their valuations depend heavily on expectations for future earnings.

The bond market has already become a major source of pressure. The 30-year U.S. Treasury yield climbed back above 5.2% on Thursday after falling sharply in the previous session, while the 10-year yield moved back toward 4.7%. The earlier decline in long-term yields had been helped by the U.S. Treasury's decision to increase purchases of longer-dated government debt, but that relief proved temporary.

The simultaneous rise in oil prices and bond yields creates a difficult environment for equities. Higher oil prices increase inflation risks, while higher Treasury yields raise the discount rate used to value future corporate earnings. Together, they can pressure both corporate margins and stock valuations.

The pressure is acute for the technology sector after semiconductor stocks suffered a major selloff earlier in the week. The Philadelphia Semiconductor Index fell nearly 5% on Tuesday, ending a powerful run fueled by expectations that artificial intelligence demand would continue to drive spending on chips and data centers.

The selloff also raises questions about whether the market's heavy concentration in AI-related companies has left investors vulnerable to shifts in interest rates. Strong earnings from technology companies and AI hyperscalers helped push the S&P 500 and Dow to record highs earlier this month, but investors have become increasingly focused on whether the enormous capital expenditure associated with AI will generate sufficiently strong returns.

The geopolitical shock is therefore arriving at an already sensitive point for U.S. equities. The market is no longer dealing with a single risk. Investors are simultaneously assessing the sustainability of AI valuations, the direction of inflation, the trajectory of Treasury yields, the U.S. government's expanding debt burden and the possibility that the Iran conflict could keep energy prices elevated.

The Federal Reserve's policy outlook has consequently become more difficult to assess. Traders had already reduced expectations for a rate cut in the near term after recent inflation data, while market pricing indicated at least one 25-basis-point rate hike by the end of 2026. A sustained oil-price shock could reinforce the argument for keeping monetary policy restrictive if it begins to feed into broader consumer prices.

The effect could extend beyond Wall Street. Higher oil prices raise transportation and production costs globally, while higher U.S. Treasury yields tend to tighten financial conditions internationally and increase the cost of dollar-denominated borrowing for governments and companies.

The developments also introduce a new risk for the global economy through the energy supply chain. Iran is a major oil producer, while the Strait of Hormuz is strategically important to global energy shipments. A prolonged confrontation that restricts traffic through the waterway could create a combination of higher energy prices and weaker economic growth, a difficult scenario for central banks.