The S&P 500 index experienced a slight decline of 0.28% today, continuing a downward trend with a 0.4% drop over the past five days. However, the index has shown resilience over the last month, gaining 2.65%.
In the large-cap sector, Southern Copper Corp. emerged as the top performer with an impressive return of 8.38%, while Freeport-McMoRan, Inc. struggled, posting a significant loss of 16.95%. Mid-cap stocks saw Xcel Energy, Inc. leading with a return of 6.69%, contrasted by Credo Technology Group Holding Ltd., which fell by 7.94%.

Small-cap stocks were notably volatile, with Integral Ad Science Holding Corp. achieving a remarkable return of 20.45%, while Harmony Biosciences Holdings, Inc. faced a steep decline of 16.56%.

Overall, the market's advance-decline ratio reflects a challenging environment, with 1,737 stocks advancing against 2,301 declining, resulting in a ratio of 0.75 across all market caps. The large-cap segment showed a ratio of 0.81, mid-cap at 0.59, and small-cap at 0.56, indicating a predominance of declining stocks in each category.