Why is Sumitomo Chemi. falling/rising?

As of 22-Sep, Sumitomo Chemical India Ltd is experiencing a decline in its stock price, currently at Rs 582.35, reflecting a decrease of Rs 17.2 or 2.87%. Today's price summary indicates that the stock underperformed its sector by 2.04%, touching an intraday low of Rs 580, which represents a drop of 3.26%. Despite a recent rise in investor participation, with delivery volume increasing significantly, the stock's performance over the past month shows a decline of 2.54%, contrasting with a year-to-date gain of 8.85%. The company's financials reveal a high management efficiency with a return on equity of 19.61% and a low debt-to-equity ratio, but concerns about long-term growth persist due to modest net sales growth and a high valuation compared to peers.
In the broader market context, the stock's short-term performance over the past week has been positive, with a return of 5.07%, while the benchmark Sensex has only increased by 0.46%. However, the stock's one-month performance is negative, which contrasts with the Sensex's gain of 1.05%. This underperformance may be attributed to the stock trading at a premium valuation, as indicated by its price-to-book value ratio, and the relatively slow growth in net sales and operating profit over the past five years. Overall, while there are positive indicators such as strong recent earnings growth, the combination of high valuation and concerns about long-term growth prospects appears to be contributing to the stock's current decline.