Warren Buffett's Berkshire Hathaway disclosed a $6 billion bet on five of Japan's biggest trading companies.
The news was released Sunday night in a press release.
The billionaire investor's company revealed that it owns just over 5% of Mitsubishi, Mitsui, Itochu, Marubeni, and Sumitomo.
Business Insider reports that all five firms rose between 4% and 10% on Monday.