"Over time, you will likely see Berkshire's ownership of all five increase somewhat," Buffett said in his annual letter to shareholders. The Japanese names in Berkshire's portfolio are Itochu, Marubeni,

Berkshire Hathaway Inc. is looking to increase ownership in Japan’s five largest trading houses “over time,” Warren Buffett said in an annual letter to shareholders that is likely to support their share prices in Tokyo.

Warren Buffett said on Saturday that his conglomerate Berkshire Hathaway will likely increase its ownership in the five Japanese trading houses it holds.