Why is Zenith Drugs falling/rising?

As of 20-Aug, Zenith Drugs Ltd is experiencing a price increase, currently at 75.85, which reflects a rise of 6.1 or 8.75%. The stock has shown strong performance today, outperforming its sector by 9.17%. Additionally, the stock's delivery volume on August 19 has surged by 521.21% compared to the 5-day average, indicating rising investor participation. In terms of returns, the stock has increased by 19.83% over the past week, significantly outperforming the Sensex, which rose by only 1.75%. However, it is important to note that the stock is still down 6.13% year-to-date and 4.41% over the past year, suggesting some underlying challenges despite the recent uptick.
In the broader market context, Zenith Drugs' strong short-term performance contrasts sharply with its year-to-date returns, where it has lagged behind the Sensex, which has gained 5.95% in the same period. This indicates that while the stock is currently benefiting from positive momentum and increased trading activity, it has struggled to maintain consistent growth over a longer timeframe. The overall market sentiment appears to be more favorable towards the benchmark, which may reflect broader economic conditions impacting investor confidence in the pharmaceutical sector.