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<a class="rwp-pr" href="http://rwire.com/296351">Stocks in Focus: Pengrowth Energy Corp (USA) (NYSE:PGH), Penn West Petroleum Ltd (USA)(NYSE:PWE), Key Energy Services, Inc. (NYSE:KEG), Whiting Petroleum Corp (NYSE:WLL)</a><script>!function(){var e="rwp-platform";if(!document.getElementById(e)){var t=document.createElement("script");t.id=e,t.src=("https:"===document.location.protocol?"https":"http")+"://publisher.releasewire.com/embed.js",t.async=!0,document.body.appendChild(t)}}();</script>

Stocks in Focus: Pengrowth Energy Corp (USA) (NYSE:PGH), Penn West Petroleum Ltd (USA)(NYSE:PWE), Key Energy Services, Inc. (NYSE:KEG), Whiting Petroleum Corp (NYSE:WLL)