The S&P 500 index experienced a notable decline, falling by 1.23% today and down 2.03% over the past five days. Over the last month, the index has decreased by 1.5%, reflecting a challenging environment for investors. In the large-cap sector, McKesson Corp. emerged as the standout performer with a return of 16.52%, while MicroStrategy, Inc. struggled significantly, posting a return of -17.12%. Mid-cap stocks saw Corpay, Inc. lead with an 11.56% return, contrasting sharply with The Estée Lauder Companies, Inc., which faced a decline of 19.19%. Small-cap stocks were led by Kulicke & Soffa Industries, Inc., achieving a remarkable return of 19.27%. However, Fluence Energy, Inc. faced the steepest decline in this category, with a return of -34.63%. Overall, the advance-decline ratio across the market showed 1,206 stocks advancing against 3,176 declining, resulting in a ratio of 0.38. In large-cap stocks, 88 advanced while 146 declined, yielding a ratio of 0.6. Mid-cap stocks had 89 advancing and 172 declining, with a ratio of 0.52, while small-cap stocks saw 488 advancing against 971 declining, resulting in a ratio of 0.5.