Group 1 - The core point of the article is that Changfei Optical Fiber announced a significant stock price fluctuation, with a cumulative increase of over 20% in closing prices over three consecutive trading days from September 16 to September 18, 2025 [1] - The company conducted a self-examination and confirmed that there is no undisclosed significant information as of the date of the announcement [1] - As of September 18, 2025, the rolling price-to-earnings (P/E) ratio of the company's A-shares is approximately 141 times, indicating a potential risk of overvaluation [1]