海川智能（300720）披露使用闲置自有资金进行国债逆回购进展，12月19日股价上涨3.81%

Group 1 - The core point of the article is that Haichuan Intelligent (300720) has reported a stock price increase and provided updates on its investment in government bond reverse repos using idle funds [1] - As of December 19, 2025, Haichuan Intelligent's stock closed at 29.98 yuan, up 3.81% from the previous trading day, with a total market capitalization of 5.842 billion yuan [1] - The stock opened at 28.81 yuan, reached a high of 31.16 yuan, and a low of 28.52 yuan, with a trading volume of 290 million yuan and a turnover rate of 5.5% [1] Group 2 - The company announced that it has been authorized to use up to 300 million yuan of idle funds for cash management, with the authorization valid until the next annual shareholders' meeting [1] - The latest investment involved a 101.2 million yuan, 28-day government bond reverse repo with an annualized yield of 1.615%, maturing on January 14, 2026 [1] - The company emphasized that the investment risks are controllable and do not affect its daily operations [1]