S&P 500 Gains in May Led by Tech and Growth

Momentum in the S&P 500 extended through May as large-cap technology and growth stocks pushed the index higher. Buying concentrated in a small group of megacap companies with large index weightings.

Traders and portfolio managers pointed to several factors behind the strength: stronger-than-expected earnings reports from major technology firms, continued demand for artificial-intelligence-related products and services, and shifting expectations about the path of U.S. interest rates. Semiconductor and software companies benefited from sustained spending on data-center capacity and AI infrastructure.

Within the index, large-cap growth stocks outperformed their value counterparts. Hardware and chipmakers, cloud and enterprise software firms, and selected online-advertising and e-commerce companies produced some of the largest gains. Energy, utilities and consumer staples showed smaller gains or declines for the month.

Market breadth was uneven. The capitalization-weighted S&P 500 recorded notable gains while the equal-weighted index trailed, indicating that a limited number of large companies accounted for much of the advance. Exchange-traded funds tracking large-cap growth strategies registered net inflows as investors reallocated capital into growth-linked names.

Macro data and Federal Reserve commentary also influenced trading. Inflation and employment releases, plus remarks from Fed officials, prompted reassessments of the timing and extent of policy moves. Movements in Treasury yields during the month supported longer-duration growth stocks when real yields fell and pressured interest-rate-sensitive parts of the market when yields rose.

Volatility measures eased compared with earlier periods this year, although intraday swings continued around key economic releases. Market participants flagged upcoming quarterly results, product announcements tied to AI and further Fed communications as the main near-term catalysts for equity performance.

Investors will monitor upcoming earnings, central bank communications and economic indicators for signals on whether the current preference for large-cap technology and growth stocks will continue.