Nasdaq and Russell 2000 Lead Declines as U.S.–Iran Strikes Reprice Risk

Tech and small caps underperform

The Nasdaq Composite closed at 26,099.77, down 271.11 points or 1.03%, while the Nasdaq 100 fell 1.29% to 29,077.22—the steepest decline among major U.S. benchmarks. The Russell 2000, tracking small-cap stocks, dropped 1.23% to 2,920.13, underperforming the large-cap S&P 500's 0.71% decline and the Dow's 0.79% fall. On the Nasdaq, declining issues outnumbered advancers by roughly 2.8 to 1.

The pattern reflected two related dynamics. Higher Treasury yields raise the discount rate applied to future earnings, which disproportionately affects growth stocks whose valuations depend on profits far in the future. Small-cap companies, meanwhile, tend to carry higher debt burdens and are more sensitive to borrowing costs, making them vulnerable when rate-hike expectations firm.

Military escalation drives the session

U.S. Central Command announced that American forces began striking Islamic Revolutionary Guard Corps targets in Iran, following what it described as recent attempted attacks against commercial shipping in the Strait of Hormuz and against U.S. service members in the region. President Donald Trump warned the U.S. would strike hard in response to Iranian retaliation, including missile attacks on U.S. bases in Jordan.

Oil prices surged in response. WTI crude rose 5.88% during the session, while Brent gained 5.47%, extending advances that had already lifted crude through Asian and European trading hours. The CBOE Volatility Index jumped 9.52%, signalling a broad repricing of near-term risk.

Rate expectations add a second layer of pressure

Beyond the immediate geopolitical shock, traders increased bets that the Federal Reserve will hike rates in September. The 10-year Treasury yield pushed above 4.79%, its highest since January 2025, as markets weighed whether higher energy costs would keep inflation above the Fed's 2% target. Fed funds futures implied roughly 68% odds of a quarter-point hike at the September 16 meeting.

Gold eased 2.35% and silver fell 3.43% during the session—a divergence from oil's advance that some analysts read as evidence of a stagflation-style worry rather than a simple growth scare. When stocks fall and yields rise simultaneously, the market is signalling concern about both inflation persistence and economic resilience.

Sector dispersion and the path ahead

Energy was the sole S&P 500 sector to finish higher, gaining 1.54%, while technology, consumer discretionary, and real estate lagged. The spread between the session's best and worst major benchmark—the Nasdaq 100 at minus 1.29% versus the S&P 500 at minus 0.71%—illustrated how unevenly the day's repricing was distributed.

Analysts noted that the Russell 2000's underperformance may persist if rate expectations remain elevated, since smaller companies face tighter credit conditions and higher refinancing costs. A credible ceasefire signal from Qatar-mediated talks, or a softer-than-expected August employment report on Friday, would be the most likely catalysts for a reversal in the current leadership pattern.