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<a class="rwp-pr" href="http://rwire.com/291150">Oil & Gas Refining & Marketing Which Changed Hands Vigorously: Valero Energy Corporation (NYSE:VLO), Phillips 66 (NYSE:PSX), Marathon Petroleum Corp (NYSE:MPC), HollyFrontier Corp (NYSE:HFC)</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>

Oil & Gas Refining & Marketing Which Changed Hands Vigorously: Valero Energy Corporation (NYSE:VLO), Phillips 66 (NYSE:PSX), Marathon Petroleum Corp (NYSE:MPC), HollyFrontier Corp (NYSE:HFC)