Why the S&P 500 and Nasdaq Just Had Their Best Month Since 2023

From Yahoo Finance: 2025-05-30 17:28:00

Stocks soared in May, with the S&P 500 and Nasdaq Composite rising 6.2% and 9.6%, respectively, making it the best month since November 2023. Trade deals, strong earnings, and economic resilience boosted investor confidence. The U.S. and China agreed to slash tariff rates for 90 days, driving significant market gains.

AI trade flourished in May, led by strong big tech earnings and AI-focused deals. Constellation Energy Group and Super Micro Computer were top performers. Nvidia stock surged 24% on the U.S.-China trade reprieve and strong quarterly earnings. Tesla stock rose 23% as Elon Musk distanced himself from the Trump administration and reaffirmed his commitment to the company.

May was challenging for the health sector, with UnitedHealth Group losing 25% of its value. The company withdrew guidance, CEO departed, and faced a DOJ investigation for possible Medicare fraud. Eli Lilly fell 18% due to scrutiny over high prices of weight-loss drugs. An executive order targeting drug prices added further pressure on pharmaceutical stocks.



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