Why is Pfizer falling/rising?

As of 01-Aug, Pfizer Ltd. is experiencing a decline in its stock price, currently at 5,057.25, which reflects a decrease of 171.15 or 3.27%. The stock has been on a downward trend, having lost 4.23% over the last three days. Today's performance is in line with the sector, which has also seen a decline of 3.26%. Over the past week, Pfizer's stock has fallen by 5.30%, and it has underperformed the benchmark Sensex, which has only decreased by 1.06% in the same period. Despite some positive indicators such as high management efficiency and a strong operating profit margin, the stock's recent movement is negatively impacted by falling investor participation, as evidenced by a 24.65% drop in delivery volume compared to the five-day average.
In the broader market context, Pfizer's short-term performance contrasts sharply with the benchmark, as it has significantly underperformed the Sensex over the past week and month. While the Sensex has shown a modest decline, Pfizer's stock has faced a more substantial drop, indicating a lack of investor confidence relative to the market. This trend is further compounded by the overall decline in the Pharmaceuticals & Drugs sector, which reflects broader challenges within the industry. Despite the company's strong financial metrics, including a high return on equity and low debt-to-equity ratio, these factors have not been sufficient to counteract the recent negative sentiment surrounding the stock.