Why is Cummins India falling/rising?

As of 17-Sep, Cummins India Ltd. is experiencing a price increase, currently at 4,122.75, with a change of 15.2 (0.37%) upwards. The stock has been performing well, having gained 2.53% over the past week and 9.09% over the last month, significantly outperforming the Sensex, which rose by 1.56% and 2.60% respectively. The stock has also reached a new 52-week high today and has shown consistent gains over the last three days, with a 2.38% return in that period. Key factors contributing to this positive movement include strong long-term fundamentals, such as an average Return on Equity (ROE) of 20.76%, healthy growth in net sales and operating profit, and a low debt-to-equity ratio. Additionally, high institutional holdings at 40.14% suggest confidence from sophisticated investors, further supporting the stock's upward trajectory.
In the broader market context, Cummins India has outperformed the benchmark indices significantly over various periods, with a year-to-date return of 25.69% compared to the Sensex's 5.83%. This strong performance is indicative of the company's robust fundamentals and investor confidence, particularly in light of its impressive operating cash flow and cash reserves. However, it is worth noting that the stock is trading at a premium valuation, with a Price to Book Value of 15.1, which may raise concerns about its sustainability in the long term. Despite this, the consistent returns over the last three years, where it has outperformed the BSE500, reflect a strong market position that continues to attract investor interest.