Major U.S. stock indexes finished Thursday in positive territory, with the Dow Jones Industrial Average advancing 1.86% to 50,848.75, the S&P 500 climbing 1.75% to 7,394.30, and the Nasdaq surging 2.54% to 25,809.66. The following stocks gained significant attention from retail traders and investors throughout the day: Space Exploration Technologies Corp. (NASDAQ:SPCX) SpaceX set the price of its shares at $135 for its Nasdaq debut on Thursday. …