S&P 500 ETFs Log Best May in 30+ Yrs on AI, Large-Cap Safety

The S&P 500 experienced its best May in over 30 years, with the SPDR S&P 500 ETF Trust (SPY) gaining 5.2%, driven primarily by the "Magnificent Seven" tech stocks, which accounted for 62% of the index's gains. This surge was fueled by easing trade tensions, strong Q1 earnings (27.7% YoY growth vs 9.4% for the rest of the S&P 500), and investor preference for large-cap stocks amidst rising bond yields, as the Roundhill Magnificent Seven ETF (MAGS) rose approximately 11%, nearly double the S&P 500’s return.

Analysis

The U.S. equity market demonstrated significant strength in May, with the SPDR S&P 500 ETF Trust (SPY) appreciating 5.2% (as of June 2, 2025), marking its best May performance in over three decades, while the tech-heavy Invesco QQQ Trust (QQQ) advanced 7.7%. This rally was predominantly driven by the "Magnificent Seven" technology companies, which contributed 62% to the S&P 500's 6.2% gain for the month; notably, NVIDIA and Tesla recorded individual monthly gains exceeding 20%, although Apple underperformed the broader index. Key catalysts for this market upswing include an easing of trade tensions, evidenced by the U.S. temporarily reducing tariffs on Chinese goods from 145% to 30% and China lowering retaliatory duties from 125% to 10% for a 90-day period, alongside President Trump postponing a 50% tariff hike on EU goods until July 9. Furthermore, robust Q1 earnings from the Magnificent Seven, which saw a combined 27.7% year-over-year increase—significantly outpacing the 9.4% growth of the other 493 S&P 500 companies and beating analyst estimates by 11.7%—bolstered investor confidence. Overall S&P 500 Q1 earnings for 477 reporting members rose 11.4% year-over-year on 4.4% higher revenues. The market also reflected an investor preference for large-cap stocks amidst a rising bond yield environment, with the 30-year Treasury yield approaching levels not seen since the financial crisis, contributing to the outperformance of ETFs like the Roundhill Magnificent Seven ETF (MAGS), which rose approximately 11% over the past month.

Key Decisions for Investors

• Investors should consider maintaining exposure to outperforming large-cap technology stocks, particularly those demonstrating strong earnings growth like NVIDIA and Tesla, while being mindful of concentration risk and individual company performance variations such as Apple's recent lag.
• Closely monitor developments in U.S.-China and U.S.-EU trade relations, as the current easing of tensions includes temporary tariff reductions (e.g., 90-day U.S.-China period) and any reversal could negatively impact market sentiment and tech sector valuations.
• In the current rising bond yield environment that has favored large-caps, continue to assess the attractiveness of this segment, but remain vigilant for signs of overvaluation or shifts in macroeconomic conditions that could alter this preference.