Apr 8, 2013 09:23AM DA Davidson Upgrades Quanta Services (PWR) to Buy
May 4, 2012 09:35AM DA Davidson Upgrades Quanta Services (PWR) to Neutral; Topping Esitmates by Improved Execution
Nov 11, 2011 10:45AM DA Davidson Downgrades Quanta Services (PWR) to Underperform; Major Pipeline Project Delay Expected to Slow Earnings Growth