Why is Thyrocare Tech. falling/rising?

As of 18-Sep, Thyrocare Technologies Ltd is experiencing a decline in its stock price, currently at 1,189.50, which reflects a decrease of 17.5 points or 1.45%. The stock has underperformed its sector by 1.34% today and has seen a trend reversal after two consecutive days of gains. Over the past week, the stock has dropped by 5.35%, while it has also underperformed in the last month with a 15.01% decline. Despite a strong year-to-date performance of 30.33% and a 39.74% increase over the past year, the company faces challenges such as falling investor participation, with delivery volume decreasing by 8.95% compared to the five-day average. Additionally, while the company boasts high management efficiency and positive financial results, it also has a high valuation and 100% of promoter shares pledged, which can exert downward pressure on the stock price.
In the broader market context, the Sensex has increased by 1.80% over the past week, contrasting with Thyrocare's decline, indicating that the stock is not keeping pace with the overall market. This underperformance is particularly notable given the company's strong long-term returns, which have outperformed the BSE500 over various periods. However, the stock's recent struggles may be attributed to concerns over its long-term growth potential, as evidenced by modest annual growth rates in net sales and operating profit over the last five years. The high price-to-book ratio and the pledged promoter shares further contribute to investor caution, leading to the current downward movement in the stock price.