MP Materials Corp. (MP) shares soared 50.6% in the last trading session to close at $45.23. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 17.1% gain over the past four weeks.MP Materials shares surged on the announcement that it has entered into a public-private partnership with the United States Department of Defense (DoD) to fast-track the development of a domestic rare earth magnet supply chain.As per the deal, MP will const ...