Core Viewpoint - The stock price of Zhongtong Bus (000957) experienced a significant drop on July 19, attributed to market rumors regarding stricter trading regulations from the exchange, which may signal a policy "cooling" effect aimed at curbing speculative trading and potentially redirecting funds to value stocks [1][2][5]. Group 1: Stock Performance - On July 19, Zhongtong Bus opened with an 8.14% increase, reaching a peak price of 27.5 CNY per share, but closed at the daily limit down of 22.89 CNY, marking a decline of 9.99% and a total market capitalization of 13.57 billion CNY [2]. - The trading volume for Zhongtong Bus on that day was 5.946 billion CNY, with a turnover rate of 39.52% [2]. Group 2: Market Rumors and Reactions - The drop in stock price was linked to rumors that a brokerage received a call from the exchange warning about strict penalties for frequent traders of Zhongtong Bus, suggesting that investors should avoid trading in this stock [2][3]. - Industry expert Wang Jianhui noted that the reliability of the rumors is uncertain and advised investors to rely on official communications from regulators [2]. Group 3: Company Background and Recent Developments - Zhongtong Bus has seen a remarkable stock price increase of 534.16% from April 27 to July 18, making it one of the top-performing stocks of the year [3]. - The second-largest shareholder, Shandong State-owned Assets Investment Holding Co., has reduced its stake by 2% on July 18 and 19, now holding approximately 15.96% of the total shares [3]. - The company primarily focuses on the development, manufacturing, and sales of buses, with a limited impact from its medical vehicle business related to nucleic acid testing [5].