Why is Pfizer falling/rising?

As of 21-Jul, Pfizer Ltd. has a current price of 5,328.50, reflecting an increase of 8.55 (0.16%). The stock has shown mixed performance in the short term, with a 1-week decline of 1.55% and a 1-month drop of 4.65%. However, it has outperformed its sector by 0.48% today. The stock is currently trading above its 100-day and 200-day moving averages, although it is below the 5-day, 20-day, and 50-day moving averages. Despite a recent decline in investor participation, as indicated by a 31.46% drop in delivery volume, the company boasts a high dividend yield of 3.76% and strong financial metrics, including a high return on equity of 19.67% and low debt-to-equity ratio, which contribute positively to its stock performance.
In the broader market context, Pfizer's recent performance contrasts with the Sensex, which has seen a minimal decline of 0.06% over the past week. While Pfizer's year-to-date return stands at 1.42%, the Sensex has outperformed it with a return of 5.20%. Over the past year, Pfizer has achieved a return of 5.91%, compared to the Sensex's 1.98%. This suggests that while Pfizer is facing short-term challenges, its long-term performance remains robust relative to the benchmark, indicating potential resilience despite recent fluctuations.