Why is SPARC falling/rising?

As of 16-Jul, Sun Pharma Advanced Research Company Ltd's stock price is currently at 163.15, reflecting an increase of 1.25 (0.77%). The stock has been gaining for the last four days, with a total return of 4.55% during this period, and it outperformed its sector by 0.98% today. The stock reached an intraday high of Rs 166.25, indicating positive momentum. However, despite this short-term gain, the stock has underperformed significantly over the longer term, with a year-to-date decline of 18.53% and a one-year return of -31.15%. The company faces challenges such as a negative book value, weak long-term growth, and a poor ability to service its debt, which contribute to its overall weak fundamental strength.
In the broader market context, while Sun Pharma Advanced Research Company Ltd has shown a positive short-term return of 3.13% over the past week, the benchmark Sensex has declined by 1.08% during the same period. This indicates that the stock is performing relatively well compared to the market. However, the company's long-term performance remains concerning, as it has consistently underperformed against the benchmark over the last three years, with a significant drop in returns compared to the Sensex's gain of 5.75% year-to-date. The combination of short-term gains and long-term underperformance paints a complex picture for investors.