The year's longest day just passed, and that means we are rapidly approaching the halfway mark of 2015. While the S&P 500 has returned roughly 3% this year, that hardly tells the story of the stocks I'm highlighting today. It should be no surprise, for instance, that Peabody Energy (BTU) and Natural Resource Partners LP (NRP 1.23%) -- which both rely heavily on the price and utility of coal -- have lost enormous sums for their investors. On the other hand, a handful of tiny and lessor known companies have had booming results.

Does this mean you should sell the winners and buy the losers? Not necessarily. Check out the slideshow below to see the story of the year's top and bottom five movers so far.

The $18 million fortune about to be ripped from your credit card--by a company up 36% this year!
Bad news for your credit card company. The plastic in your wallet may soon be gone forever. And once it is, it could cost several companies as much as $18 million a day! Good news for you. Because when you're finally able to say "goodbye" to the cards stuck in your wallet, a little-known tech company responsible for finally putting an end to plastic could hand its investors life-changing profits. A revealing investor alert from The Motley Fool has the full story. Click here to get it now.