Why is Pfizer falling/rising?

As of 04-Aug, Pfizer Ltd. is experiencing a decline in its stock price, currently at Rs 4,993.90, which reflects a decrease of Rs 60.6 or 1.2%. The stock has underperformed its sector by 1.54% today and has been on a consecutive downward trend for the last four days, resulting in a total drop of 5.43% during this period. Additionally, the stock has touched an intraday low of Rs 4,925.7, indicating significant selling pressure. Over the past week, Pfizer's performance has been notably poor, with a decline of 5.33%, while its one-month return stands at a decrease of 13.69%. Despite these challenges, the company maintains a high management efficiency with a return on equity (ROE) of 19.67% and a low debt-to-equity ratio, which could provide some support for the stock in the long run.
In the broader market context, Pfizer's recent performance contrasts sharply with the Sensex, which has shown a slight increase of 0.16% over the past week. While the benchmark has experienced a modest decline of 2.89% over the last month, Pfizer's significant drop of 13.69% indicates a more pronounced weakness relative to the market. The falling investor participation, evidenced by a 20.39% decrease in delivery volume, further exacerbates the stock's challenges. Despite a high dividend yield of 3.95%, the overall market sentiment appears to be weighing heavily on Pfizer's stock, contributing to its recent price decline.