Movers & Shakers: Thursday���s biggest gainers and decliners

moves ahead of Thursday���s U.S. stock-market open: Apple Inc.���s /quotes/comstock/15*!aapl Rubicon Technology Inc.���s /quotes/comstock/15*!rbcn Guess Inc.���s /quotes/comstock/13*!ges Natural Resource Partners LP���s /quotes/comstock/13*!nrp...