多只牛股，密集公告！

Core Viewpoint - Multiple companies have issued announcements regarding stock trading risks, highlighting significant price fluctuations and operational uncertainties, urging investors to exercise caution in their trading decisions [1][3][5]. Group 1: Company Announcements - Shida Group announced that it has not engaged in any business cooperation with Alibaba Cloud, despite rumors, and reported a revenue of 134.59 million yuan with a net loss of 87.57 million yuan as of Q3 2025 [3][4]. - Pinggao Co. stated that its stock price had deviated significantly, with a cumulative increase of over 30% in two trading days, while its operational status remains stable [3][4]. - Long光华芯 confirmed that its recent operations are normal, but the contribution of its optical communication chips to sales and profits remains uncertain [5]. - Pinming Technology reported a 255.54% increase in stock price since September 25, 2025, and warned of potential risks due to price volatility [4][5]. - Jindike announced that it has produced approximately 1.56 million doses of a quadrivalent influenza vaccine, but sales are subject to seasonal fluctuations and uncertainties [5]. Group 2: Stock Buyback Adjustments - Industrial Fulian adjusted its share buyback price limit from 19.36 yuan to 75 yuan per share to ensure the smooth implementation of its buyback plan, reflecting confidence in its future development [2][6]. - The company has repurchased 7.70 million shares, accounting for 0.04% of its total share capital, with a total expenditure of 147 million yuan [6][7]. - Following a clarification announcement regarding its operational status, Industrial Fulian's stock price stabilized and rebounded, with recent trading prices reported at 58.93 yuan per share, giving it a market capitalization of 1.17 trillion yuan [8].