Sumitomo, Mitsubishi look to U.S. for rare earths By: MarketWatch December 06, 2010 at 22:00 PM EST Japanese trading houses Sumitomo Corp. and Mitsubishi Corp. have reportedly begun discussions to acquire a stake in U.S. rare-earths miner Molycorp Inc.. Read More >> Related Stocks: Mitsubishi Corp Spon Sumitomo Corp ADR