The S&P 500 is down 12% this year. But some stocks are doing spectacularly well.

My newsletter, which has been picking three stocks a month for the last five and a half years, has found several of them. This year, it's up 29% so far. That increase is the rise in the average stock mentioned in the newsletter since its initial mention through the end of June. And it uses a 2% stop loss rule which automatically sells any stock that has declined by 2% and charges that decline against the returns.

Here are the three biggest winners:

• Walter Industry (NYSE: WLT) +156%
• Southwestern Energy (NYSE: SWN) +44%
• Chart Industries (NYSE: GTLS) +43%

With oil prices on the rise, these three are likely to benefit. But at some point, their valuations will exceed their earnings growth. So keep a close eye on them.

Peter Cohan is President of Peter S. Cohan & Associates. He also teaches management at Babson College and edits The Cohan Letter. He has no financial interest in the securities mentioned.