Zhi Tong Cai Jing·2025-10-22 10:41Core Viewpoint - Sinopec Oilfield Services (600871) has experienced a significant stock price fluctuation, with a cumulative increase of over 20% in the closing price over three consecutive trading days from October 20 to 22, 2025, indicating abnormal trading activity [1] Summary by Sections - Stock Price Movement - The company's A-share stock price has shown a cumulative increase of over 20% during the specified trading days, which is classified as abnormal stock trading activity according to the Shanghai Stock Exchange regulations [1] - Company's Response - Following the stock price volatility, the company conducted a self-examination and inquired with its controlling shareholder and actual controller, confirming that there are no undisclosed significant information as of the date of the announcement [1] - Investor Advisory - The company has advised investors to be cautious of the risks associated with secondary market trading and to make rational investment decisions [1]