U.S. stocks tumbled on Tuesday as fresh Middle East hostilities drove crude oil above $90 a barrel and deepened a bond market sell-off. The S&P 500 fell 0.7%, while the 10-year Treasury yield climbed to 4.79%, amplifying anxiety over stubbornly high inflation and potential Federal Reserve rate hikes.
Wall Street extended its September slump on Tuesday, locked in sizable losses as escalating military hostilities between the U.S. and Iran sent energy prices surging according to financial reporting. Major indexes dropped for the third consecutive session, weighed down by mounting pressure across technology giants and heightened borrowing costs across the wider economy. The S&P 500 index fell 0.7%, the Dow Jones Industrial Average dropped 0.8%, and the Nasdaq composite slid 1%. The major indexes have lost ground three days in a row. The weak start to September follows a shaky but mostly positive month for Wall Street, as every major index notched monthly gains in August.
U.S.-Iran Conflict Spurs Oil Surge and Inflation Worries
Stocks closed broadly lower Tuesday as another round of U.S. military strikes on Iran sent oil prices higher, stoking worries about stubbornly high inflation. Tensions flared up again in the region, raising the risk of a wider conflict.
Treasury Yields Climb as National Debt Surpasses $40 Trillion
A bond market sell-off deepened, putting more pressure on stocks. The yield on the 10-year Treasury, which tends to impact mortgage rates, rose to 4.79% from 4.75% late Monday. It was as low as 4.20% at the beginning of 2026. The yield on the 2-year Treasury, which closely tracks expectations for Federal Reserve moves on interest rates, rose to 4.39% from 4.34% late Monday, up significantly from about 3.50% at the beginning of 2026.
Bond yields, which have an inverse relationship to prices, rise as bond prices fall. Rising yields signal that investors are demanding a higher return from Treasurys because they are becoming riskier, and growing government debt is highlighting that risk. The U.S. debt surpassed $40 trillion two weeks ago, a shocking milestone as defense costs and interest on the burgeoning deficit make up an enormous share of federal spending.
Technology Heavyweights and Broad Market Indexes Slide
Technology stocks were among the heaviest weights on the market. Nvidia fell 1.5%, Amazon dropped 1.9%, and Advanced Micro Devices gave up 2.4%. Their big market values tend to give them more influence over the broader market’s direction, and their growth amid the artificial-intelligence boom has been heavily reliant on borrowing, which becomes more expensive as interest rates rise.
Federal Reserve Rate Expectations and Upcoming Economic Data
US stock index futures slipped as fresh hostilities in the Middle East sent oil prices higher, deepening market gloom ahead of inflation data later this week. Investors are tracking the U.S. nonfarm payrolls report due on Friday. Market participants are weighing potential further rate hikes following hawkish remarks from Fed Chair Kevin Warsh.
Still, traders see a 66% chance of an increase this month, according to CME FedWatch.
Globally, equity markets also reflected the cautious sentiment. Key domestic equity indices in India closed marginally lower on Tuesday, extending their downward trajectory for the second consecutive trading session as renewed geopolitical tensions in the Middle East drove crude oil prices and global bond yields higher. The benchmark Nifty slipped below the psychological 24,100 threshold, weighed down by heavy selling pressure across banking, financial services, auto, and pharmaceutical counters, while IT and FMCG heavyweights cushioned the broader market. At the closing bell, the 30-share S&P BSE Sensex declined by 12.99 points, or 0.02%, to settle at 76,944.28, and the NSE Nifty 50 index lost 24.60 points, or 0.01%, ending the day at 24,055.80. Major drags on the Nifty index included Axis Bank down 3.23%, State Bank of India falling 2.41%, and ICICI Bank shedding 1.10%, alongside broader figures showing India’s HSBC Manufacturing Purchasing Managers’ Index (PMI) easing to 52.8 in August 2026 from 53.5 in July.
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