S&P 500 Hits Record High Amid Iran War

The S&P 500 closed above 7,400 on Monday, hitting an all-time high even as the U.S.-Iran war drags on with no peace deal in sight [2]. The index has rebounded roughly 17% from its March low of around 6,300, recovering quickly after an initial 8% slide following the U.S. strike on Tehran on Feb. 28 [2].

Oil prices remain elevated, having climbed above $120 a barrel at the conflict's height and sitting above $100 recently, yet the market has not entered a correction [2]. A review of 1,465 earnings transcripts by Trivariate Research found that only 10% of the U.S. equity market's capitalization expects a negative or mixed impact from the war [2]. This suggests that while consumer discretionary sectors face pressure, the broader market sees energy costs as a manageable input rather than a structural threat [2].

Corporate earnings are being powered by a small group of massive technology firms. The "Magnificent Seven" are now outpacing the earnings of the other 493 S&P 500 stocks by more than 40%, a level not seen since 2014 [2]. The top 10 companies now account for 34% of the index's total profits, double the share they held in 1996 [2].

The U.S. economy is fundamentally less vulnerable to energy shocks than in previous decades. Bank of America Securities notes the country now requires only a third of the oil needed in the 1970s to produce the same amount of GDP [2]. Consequently, a 10% oil price shock would impact inflation by just 0.25 percentage points today, compared to 0.90 points in the 1970s [2].

The rally suggests investors are betting on structural resilience over geopolitical risk, though the heavy reliance on a handful of tech names leaves the market exposed if that specific momentum falters.