Why is Pfizer falling/rising?

As of 29-Aug, Pfizer Ltd. is experiencing a decline in its stock price, currently at 5,144.30, reflecting a decrease of 49.25 points or 0.95%. The stock has underperformed its sector by 0.98% today and has been on a consecutive downward trend for the past five days, resulting in a total decline of 9.51% during this period. Additionally, the stock's performance over the past week shows a significant drop of 9.17%, while it has also underperformed the benchmark Sensex over the past month and year. Despite having a high dividend yield of 3.18% and strong management efficiency indicated by a high return on equity (ROE) of 18.22%, the stock's recent movement is negatively impacted by falling investor participation, as evidenced by a 38.99% drop in delivery volume compared to the five-day average.
In the broader market context, Pfizer's recent performance contrasts sharply with the Sensex, which has only declined by 1.84% over the past week and has shown positive returns year-to-date. This indicates that while the overall market is experiencing a downturn, Pfizer's decline is more pronounced, suggesting company-specific challenges. The stock's returns over the past year are also concerning, with a drop of 13.97% compared to the Sensex's decline of only 2.83%. The combination of these factors, including the stock's recent underperformance and reduced trading activity, contributes to the ongoing decline in Pfizer's stock price.