On August 31, Berkshire announced that over the prior 12 months it had acquired 5% passive stakes in five Japanese “trading companies”. These businesses are more akin to conglomerates and include: Itochu, Marubeni, Mitsubishi, Mitsui and Sumitomo. Berkshire noted in the press release that it also had about the same amount of yen-denominated debt outstanding ($5.7 billion at a weighted average rate of 0.6%) effectively offsetting the currency risk.
A link to the press release is here.