Why is Sanofi India falling/rising?

As of 22-Aug, Sanofi India Ltd's stock price is currently at 5,237.95, reflecting a decline of 38.55 points or 0.73%. The stock has shown mixed performance recently, with a 1-week return of +3.31%, but it has significantly underperformed in the longer term, with a 1-month return of -11.65% and a year-to-date decline of -14.13%. Today's price summary indicates that the stock has underperformed its sector by 1.07%, and while it is higher than its 5-day moving average, it remains below its longer-term moving averages. Additionally, there has been a notable decrease in investor participation, with delivery volume falling by 18.59% against the 5-day average. Despite a high return on equity (ROE) of 35.83% and low debt levels, the company faces challenges such as poor long-term growth, with net sales declining at an annual rate of -8.57% over the past five years.
In the broader market context, while the Sensex has gained 0.88% over the past week, Sanofi India's performance has been lackluster, particularly over the last year, where it has generated a return of -23.45%. This underperformance is compounded by flat results in recent quarters, including a significant drop in net sales. The stock is also considered expensive relative to its peers, trading at a premium with a price-to-book value of 14, which may deter potential investors. Overall, the combination of declining sales, high valuations, and recent underperformance relative to both the sector and broader market indices contributes to the stock's downward movement.