Core Viewpoint - The Hainan Free Trade Zone sector experienced a short-term surge on December 31, with Hainan Development hitting the daily limit, and other companies such as Haikou Gas Group, Hainan Airport, Hainan Huatie, Caesar Travel, and Hainan Mining also seeing gains [1]. Company and Industry Summary - Hainan Development reached its daily limit increase [1] - Haikou Gas Group, Hainan Airport, Hainan Huatie, Caesar Travel, and Hainan Mining followed with notable increases [1]

每经AI快讯，12月19日，海南自贸区板块持续走高，海汽集团、海南发展涨停，海峡股份、京粮控 股、海南橡胶、欣龙控股、凯撒旅业等跟涨。 （文章来源：每日经济新闻） ...

Group 1 - The Hainan Free Trade Zone sector shows signs of recovery, with Xunlong Holdings hitting the daily limit up [1] - Other companies such as Hainan Ruize, Intercontinental Oil & Gas, Shennong Agriculture, and Hainan Expressway also experienced gains [1]

Group 1 - The Hainan Free Trade Zone sector experienced a short-term surge, with Haiqi Group hitting the daily limit up [1] - Other companies such as Hainan Airport, Jinpan Technology, Hainan Development, Haide Shares, and Hainan Ruize also saw increases in their stock prices [1]