日股三井物产涨逾2%

Group 1 - The core point of the article is that Mitsui & Co.'s stock price increased by 2.2% following the announcement of Warren Buffett increasing his stake in the company [1] Group 2 - The stock price movement indicates positive market sentiment towards Mitsui & Co. after the news of Buffett's investment [1] - The involvement of a prominent investor like Warren Buffett may enhance the company's credibility and attract further investment interest [1]