Tech Earnings Fuel S&P 500 and Nasdaq to Best Month Since 2020 Despite Middle East Tensions

The S&P 500 and Nasdaq just wrapped one of their strongest months in years, with the Nasdaq composite closing April with a 15.3% gain—its best month since the chaotic early 2020 Covid trading period. The S&P 500 matched that milestone, also achieving its best month since 2020, with both benchmarks finishing the day at fresh record highs. The rally proved remarkably resilient given headwinds including Middle East conflict, a fractured Federal Reserve, and the high stakes of tech earnings season.

Thursday's action revealed an interesting divergence in what's driving gains. While the Nasdaq rose nearly 1% on the day, the technology sector actually fell, dragged down by a 4.6% decline in Nvidia. The real mover was Caterpillar, which spiked 9.9% after raising its full-year outlook thanks to robust demand from AI-supporting data centers—a reminder that the AI boom extends beyond pure-play tech stocks to industrial beneficiaries. The Dow industrials climbed about 1.7% on the Caterpillar surge.

Big Tech's earnings painted a mixed picture. Microsoft, Alphabet, Meta, and Amazon all reported strong results boosted by AI proliferation, yet investor reactions diverged sharply. Alphabet rose 10% on a cloud-business boom, while Meta fell more than 8% after announcing heavy spending on AI data centers, and Microsoft slumped 3.9% citing its own cost concerns. This divergence signals that even within the AI beneficiary class, execution and capital allocation matter intensely to markets.

The macroeconomic backdrop remained fraught. The Fed's preferred inflation gauge showed March pricing pressures ratcheted higher due to energy costs tied to Iran tensions. First-quarter GDP disappointed, coming in weaker than expected as consumer spending slowed. Oil futures reflected the geopolitical uncertainty—prices jumped on reports that President Trump would receive briefings on new military options for Iran, then gave back gains, ultimately slipping 1.7% to $105.07 a barrel. The ECB and Bank of England joined the Fed in keeping rates steady, offering no relief to growth concerns.