Why is Sundaram Finance falling/rising?

As of 08-Sep, Sundaram Finance Ltd is experiencing a decline in its stock price, currently at 4,477.30, which reflects a decrease of 45.7 points or 1.01%. The stock has underperformed its sector by 1.1% today and has seen a trend reversal after three consecutive days of gains. Additionally, the stock's performance over the past week shows a slight increase of 0.70%, but it has underperformed over the past month with a decline of 0.67%. The stock is currently trading above its 5-day moving averages but below its longer-term averages, indicating mixed short-term momentum. Furthermore, there has been a notable decrease in investor participation, with delivery volume falling by 31.36% compared to the 5-day average. While the company has strong long-term fundamentals, including a solid average return on equity of 13.90% and high institutional holdings at 26.63%, it is facing challenges due to flat results in June and an expensive valuation relative to its peers.
Broader market context indicates that while Sundaram Finance has shown a year-to-date return of 7.76%, which is significantly higher than the Sensex's 3.39%, its one-year performance is concerning with a decline of 9.17% compared to the Sensex's slight drop of 0.49%. The stock's recent struggles can be attributed to its high price-to-book value of 3.8, suggesting it is trading at a premium compared to historical valuations. Despite a 22.9% increase in profits over the past year, the stock's negative return indicates investor sentiment may be cautious, particularly in light of the company's operating cash flow issues and a PEG ratio of 1.1, which suggests that the stock may be overvalued given its growth prospects.