the logo of american multinational investing conglomerate berkshire hathaway is displayed on a smartphone screen berkshire hathaway on monday said its whollyowned subsidiary national indemnity company has increased its stake in five japanese trading firms to average more than 85 the companies involved are itochu marubeni mitsubishi mitsui and sumitomo the aggregate value of these interests surpasses that of berkshireheld stock in any country outside of the us the firm said berkshire hathaway said it intends to hold its japanese investments for the long term with ceo warren buffett pledging the company will only purchase up to 99 of any of the five firms it owns no other investments in japan this is a developing story and will be updated shortly