The Investor
18 Aug 2026, 14:00
U.S. Stocks Fall as Iran Conflict, Rising Oil Prices and Treasury Yields Pressure Markets
U.S. stocks traded lower Tuesday as the continuing U.S.-Iran conflict pushed oil prices higher and intensified concerns about inflation and interest rates, with technology stocks leading the decline.
The Nasdaq Composite fell 1.3% to 26,301, underperforming the broader market. The S&P 500 declined 0.49% to 7,707, while the Dow Jones Industrial Average was down 0.06% at 53,429.
The risk-off move comes as hopes for a lasting resolution to the U.S.-Iran conflict fade. Iran has shifted toward a more offensive military posture after efforts to negotiate a permanent end to the conflict stalled, while Washington declined to extend the temporary ceasefire.
Oil and Bond Yields Add Pressure
Energy markets remain one of the main channels through which the conflict is affecting U.S. equities. Brent crude rose for a third consecutive session Tuesday, trading around $91 per barrel and reaching its highest level in nearly three weeks as continued restrictions around the Strait of Hormuz raised concerns about global oil supplies.
Higher oil prices are feeding concerns that energy costs could keep inflation elevated, complicating the outlook for monetary policy.
Those concerns have spilled into the bond market. The U.S. 30-year Treasury yield climbed as high as 5.327%, its highest level since 2007, while the benchmark 10-year yield was also around 4.73%. The rise in long-term yields reflects a combination of inflation concerns related to the conflict and oil prices, alongside broader worries about U.S. borrowing and debt issuance.
The combination of higher energy prices and rising bond yields is particularly challenging for growth and technology stocks, helping explain the Nasdaq's sharper decline.
Latest U.S. Data Point to Softer Economic Momentum
Tuesday's economic releases added another layer of uncertainty.
U.S. housing starts dropped 12.4% month-over-month in July to an annualized 1.239 million units, well below expectations of 1.340 million and down sharply from 1.415 million previously.
Industrial production increased just 0.2% month-over-month in July, below the 0.3% forecast and previous reading. On a year-over-year basis, production growth slowed to 1.08% from 1.29%.
The labor market offered a somewhat stronger signal. Weekly ADP employment growth came in at 9,500 jobs, up from 8,300 previously.
Taken together, the data point to uneven economic momentum: employment continues to expand, but housing activity weakened sharply and industrial production grew more slowly than expected.
For Wall Street, however, geopolitics remains the dominant driver Tuesday. As long as the U.S.-Iran conflict keeps Brent crude elevated and pushes longer-term Treasury yields higher, pressure on equity valuations — particularly in the technology sector — is likely to remain a central market risk.
U.S. stocks traded lower Tuesday as the continuing U.S.-Iran conflict pushed oil prices higher and intensified concerns about inflation and interest rates, with technology stocks leading the decline.
The Nasdaq Composite fell 1.3% to 26,301, underperforming the broader market. The S&P 500 declined 0.49% to 7,707, while the Dow Jones Industrial Average was down 0.06% at 53,429.
The risk-off move comes as hopes for a lasting resolution to the U.S.-Iran conflict fade. Iran has shifted toward a more offensive military posture after efforts to negotiate a permanent end to the conflict stalled, while Washington declined to extend the temporary ceasefire.
Oil and Bond Yields Add Pressure
Energy markets remain one of the main channels through which the conflict is affecting U.S. equities. Brent crude rose for a third consecutive session Tuesday, trading around $91 per barrel and reaching its highest level in nearly three weeks as continued restrictions around the Strait of Hormuz raised concerns about global oil supplies.
Higher oil prices are feeding concerns that energy costs could keep inflation elevated, complicating the outlook for monetary policy.
Those concerns have spilled into the bond market. The U.S. 30-year Treasury yield climbed as high as 5.327%, its highest level since 2007, while the benchmark 10-year yield was also around 4.73%. The rise in long-term yields reflects a combination of inflation concerns related to the conflict and oil prices, alongside broader worries about U.S. borrowing and debt issuance.
The combination of higher energy prices and rising bond yields is particularly challenging for growth and technology stocks, helping explain the Nasdaq's sharper decline.
Latest U.S. Data Point to Softer Economic Momentum
Tuesday's economic releases added another layer of uncertainty.
U.S. housing starts dropped 12.4% month-over-month in July to an annualized 1.239 million units, well below expectations of 1.340 million and down sharply from 1.415 million previously.
Industrial production increased just 0.2% month-over-month in July, below the 0.3% forecast and previous reading. On a year-over-year basis, production growth slowed to 1.08% from 1.29%.
The labor market offered a somewhat stronger signal. Weekly ADP employment growth came in at 9,500 jobs, up from 8,300 previously.
Taken together, the data point to uneven economic momentum: employment continues to expand, but housing activity weakened sharply and industrial production grew more slowly than expected.
For Wall Street, however, geopolitics remains the dominant driver Tuesday. As long as the U.S.-Iran conflict keeps Brent crude elevated and pushes longer-term Treasury yields higher, pressure on equity valuations — particularly in the technology sector — is likely to remain a central market risk.
