📈 U.S. Stock Market: Top Performers and Laggards in 2025 (YTD Q3)

According to S&P Global, total U.S. stock market capitalization grew 13.2% from December 2024 to September 2025. The “Magnificent Seven” continued to lead, with their combined market cap surging 17.6%, outpacing the broader S&P 500’s 14.3% gain. Among the top 10 U.S. companies, Broadcom (+43.4%), Nvidia (+37.9%), and J.P. Morgan (+28.5%) posted the strongest year-to-date gains.