Why is Pfizer falling/rising?

As of 28-Jul, Pfizer Ltd. is experiencing a decline in its stock price, currently at Rs 5,275.00, reflecting a decrease of Rs 65.5 or 1.23%. Today, the stock opened with a gain of 6.54% and reached an intraday high of Rs 5,689.95, but ultimately underperformed its sector by 1.31%. The stock has shown high volatility today with an intraday volatility of 6.66%. Over the past week, Pfizer's stock has decreased by 1.00%, and over the past month, it has fallen by 7.47%. While the company has reported strong quarterly net sales and operating profit figures, concerns about long-term growth persist, as net sales have only grown at an annual rate of 1.18% over the last five years, contributing to the stock's recent downward movement.
In the broader market context, Pfizer's short-term performance has outperformed the benchmark Sensex over the past week, which has declined by 1.59%. However, over the past month, Pfizer's decline of 7.47% is significantly worse than the Sensex's drop of 3.77%. Despite a high management efficiency indicated by a return on equity of 19.67% and a relatively low debt-to-equity ratio, the stock is trading at a premium compared to its peers, which may deter some investors. The high dividend yield of 3.75% at the current price could attract income-focused investors, but the overall sentiment remains cautious due to the company's expensive valuation and modest growth prospects.