This article originally appeared on the Motley Fool.
The stock market has done reasonably well so far in 2017, with the S&P 500 (SNPINDEX:^GSPC) enjoying total returns of about 7% and remaining close to all-time record levels. But some stocks have done a lot better than the overall market, and shareholders in those companies have made a killing. In particular, Universal Display (NASDAQ:OLED) , Weight Watchers International (NYSE:WTW) , and Exact Sciences (NASDAQ:EXAS) have all doubled in the first five months of 2017, and some investors wonder if they have even further to climb in the near future.
Universal Display is anything but flat
Universal Display has been a leading company in producing organic light emitting diodes for flat-panel displays, including both large formats like television sets and smaller footprints like mobile devices. The company has been working to expand its production capacity recently, and many investors have hoped that big orders for OLED displays would eventually come.
Most of the gains so far in 2017 have come from reports that Apple (NASDAQ:AAPL) is considering using OLED screens in its future iPhone products, and that could result in a huge boost in demand for the displays from Universal Display. So far, Universal Display has been a bit vague about the prospects for an OLED iPhone, but that’s not unusual for a company seeking to do business with the mobile-device pioneer. With rising guidance for revenue and expectations for increased production, shareholders are betting that the iPhone effect will boost Universal Display’s fundamentals going forward, and that’s enough to justify a big move in the shares this year.
Weight Watchers picks up steam
Weight Watchers International has been a popular stock recently, although it has also been a volatile one. In 2015, the stock rose more than fivefold in just a matter of months, and coming into 2017, the weight-loss specialist had seen plenty of ups…