两大板块，涨停潮！

Core Viewpoint - The A-share market showed overall strength on December 22, with the Shanghai Composite Index returning above the 3900-point mark [3]. Group 1: Market Performance - The Shanghai Composite Index rose above the 3900-point threshold, indicating a positive market sentiment [3]. - Major indices experienced varying degrees of increase, with the communication sector leading the gains, showing an intraday increase of over 4% [3]. Group 2: Sector Highlights - The communication sector saw significant stock performance, with several stocks hitting the daily limit up, including Changxin Bochuang (300548) and Dingtong Technology, which both had intraday gains exceeding 10% [3][4]. - Other sectors such as non-ferrous metals, electronics, and comprehensive industries also recorded gains of over 2% [4]. - The Hainan Free Trade Zone concept sector experienced a surge, with multiple stocks, including Shennong Seed Industry (300189), reaching the daily limit up [6]. Group 3: Specific Stock Movements - Notable stock performances included: - Changxin Bochuang (300548) at 157.55, up 18.25, a 13.10% increase [4]. - Dingtong Technology (688668) at 109.23, up 10.13, a 10.22% increase [4]. - Shennong Seed Industry (300189) at 20.03, reaching the daily limit up [7]. - The announcement of the official launch of the Hainan Free Trade Port, effective December 18, 2025, is expected to impact related stocks positively [7].