Why is Dr Reddy's Labs falling/rising?

As of 08-Sep, Dr Reddys Laboratories Ltd is experiencing a decline in its stock price, currently at 1,250.35, reflecting a decrease of 18.2 points or 1.43%. Today's performance indicates that the stock has underperformed its sector by 1.3%. The stock's recent returns show a 1-week decline of 2.34%, while it has gained 3.19% over the past month. However, year-to-date, the stock has fallen by 9.93%, and over the past year, it has decreased by 6.27%. Despite these declines, the company maintains a low debt profile and strong long-term fundamentals, with net sales growing at an annual rate of 13.13% and an operating profit growth of 31.97%. The stock's attractive valuation, with a price-to-book value of 3.1 and a return on equity of 16.9, suggests it is trading at fair value compared to its peers.
In the broader market context, the Sensex has shown a positive return of 0.53% over the past week, contrasting with Dr Reddy's stock decline. This underperformance may be attributed to falling investor participation, as evidenced by a significant drop in delivery volume by 52.54% against the 5-day average. Despite high institutional holdings at 63.1%, which typically indicate strong analytical capabilities, the stock's liquidity remains adequate for trading. Overall, while the company has strong fundamentals, the recent price movement reflects a combination of short-term market pressures and declining investor interest.