Enphase Energy Inc (NASDAQ:ENPH) stock has reversed its sharp premarket losses, up 2.6% to trade at $116.48. The alternative energy company's first-quarter results and second-quarter revenue forecast came in below estimates, initially dragging the solar sector as a whole today. Jefferies downgraded ENPH to "hold" from "buy," while a flood of other analysts chimed in with mixed price-target adjustments. Meanwhile, a coalition of six solar manufacturers are petitioning the U.S. to impose tariffs on imports fr ...