Group 1 - The Hang Seng Index fell by 0.84%, down 215 points, closing at 25,549 points, while the Hang Seng Tech Index dropped by 1.32% [1] - The trading volume in the Hong Kong stock market reached HKD 107.8 billion in the morning session [1] - Optical communication stocks surged, driven by increased demand for high-speed optical transceiver modules, with institutions predicting a significant rise in shipment volumes next year [1] Group 2 - Notable gainers included Hongteng Precision, which rose by 7.95%, and Changfei Optical Fiber, which increased by 4.57% [1] - Zhaoyan New Drug saw an increase of over 8% due to a surge in the price of experimental monkeys, with institutions indicating a potential widening supply-demand gap [1] - The stock of Excellence Education, a provider of digital solutions for higher education, rose over 16% on its second day of trading, with its market value approaching HKD 10 billion [1] Group 3 - Oil stocks collectively declined, with geopolitical events weakening support for oil prices, although institutions remain optimistic about the long-term investment value of major oil companies [1] - PetroChina fell by 3%, Sinopec by 2.21%, and CNOOC by 2.32% [1] Group 4 - The non-ferrous metals sector faced significant declines, with Jiangxi Copper down 5.96%, Luoyang Molybdenum down 6.27%, and China Aluminum down 5.34% due to market concerns over central banks' interest rate policies [2] - Silver Noble Pharmaceuticals saw a drop of over 14%, with a cumulative decline of 25% since entering the market [2] Group 5 - Ocean Park Corporation's stock fell by 9%, reaching a new low for the year, amid financial product repayment issues faced by its controlling shareholder [3]