Ferroglobe (GSM) shares soared 11% in the last trading session to close at $5.04. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 8.6% gain over the past four weeks.Ferroglobe shares have gained after the U.S. Department of Commerce issued favorable preliminary rulings in its investigations into unfairly priced and subsidized silicon metal imports from Angola, Australia, Laos, Norway and Thailand. Silicon metal, essential in alum ...