The S&P 500 experienced a modest increase of 0.83% today, although it remains down 2.42% over the past month. In the large-cap segment, Vertiv Holdings Co. stood out as the top performer with a return of 9.33%, while Arthur J. Gallagher & Co. lagged behind, posting a decline of 4.54%. In the mid-cap category, Teradyne, Inc. led the way with an impressive return of 8.57%, whereas Charter Communications, Inc. faced a downturn of 4.06%. The small-cap sector saw significant volatility, with Xenon Pharmaceuticals, Inc. soaring by 49.64%, contrasting sharply with PBF Energy, Inc., which fell by 11.86%. Overall, the advance-decline ratio across the market showed a slight edge for advancing stocks, with 2,192 stocks gaining and 2,142 declining, resulting in a ratio of 1.02. In large caps, 123 stocks advanced compared to 110 that declined, yielding a ratio of 1.12. However, mid-cap and small-cap stocks faced more challenges, with ratios of 0.93 and 0.99, respectively, indicating a more balanced performance in those segments.