The S&P 500 experienced a slight decline of 0.06% today, although it has shown a notable increase of 2.35% over the past 30 days. In the large-cap segment, Marathon Petroleum Corp. emerged as the top performer with a return of 7.42%, while Corning, Inc. struggled, posting a loss of 4.78%. Mid-cap stocks saw Datadog, Inc. leading with an impressive return of 11.48%, contrasting with Coherent Corp., which faced a significant decline of 14.24%. The small-cap sector was dominated by AbCellera Biologics, Inc., achieving a remarkable return of 34.78%. However, N-able, Inc. faced challenges, recording a steep loss of 35.67%. Overall, the advance-decline ratio across the market indicated that 1,507 stocks advanced compared to 2,396 that declined, resulting in a ratio of 0.63. In the large-cap category, 117 stocks advanced against 100 that declined, yielding a more favorable ratio of 1.17. Conversely, mid-cap stocks had 113 advancing and 133 declining, while small-cap stocks saw 427 advancing versus 902 declining, reflecting ratios of 0.85 and 0.47, respectively.