Clover Global Solutions, a staffing provider serving the energy industry, reported revenue rose to $57 million in 2011, up 14 percent from $50 million in 2010. The Houston-based firm had revenue of $38 million in 2009.

Clover reported it provides upstream oil and gas recruitment to 40 percent of the publicly traded integrated operators, mid-majors, pioneering independents, engineering and construction firms, and oilfield service companies.