Berkshire Hathaway CEO Greg Abel said on Thursday that the company is considering increasing its stakes in Japan's five largest trading houses—Mitsubishi Corp., Itochu Corp., Mitsui & Co., Sumitomo Corp., and Marubeni Corp.—while also seeking more joint investments and M&A activities with these companies globally. This marks Abel's first visit to Tokyo since becoming Berkshire Hathaway CEO in January.