Why is Star Delta Trans falling/rising?

As of 28-Aug, Star Delta Transformers Ltd is experiencing a price increase, currently at Rs 643.10, reflecting a rise of 63.2 points or 10.9%. The stock has shown strong performance today, outperforming its sector by 11.77% and gaining 11.26% over the last three days. It opened with a gain of 4.16% and reached an intraday high of Rs 680, indicating significant upward momentum. However, despite this recent surge, the stock has underperformed over the past month and year, with returns of -10.43% and -19.04% respectively. The company has a low debt-to-equity ratio and has demonstrated healthy long-term growth in net sales and operating profit, but it also faces challenges such as poor management efficiency and flat quarterly results.
In the broader market context, the stock's recent performance contrasts sharply with the Sensex, which has declined by 2.34% over the past week. While Star Delta Transformers Ltd has gained 9.14% in the same timeframe, its year-to-date performance remains negative at -29.78%, compared to the Sensex's positive return of 2.48%. This divergence suggests that while the stock is currently benefiting from short-term gains, it has struggled significantly over the longer term, indicating a complex relationship with market trends and investor sentiment.