NEW YORK (TheStreet) -- Laredo Petroleum shares closed trading up 11.98% to $10 in trading on Friday as the independent oil and gas developer benefited from rising oil prices. The price of a barrel of industry standard Brent crude was up 5.42% in trading on Friday while the price of WTI crude is also up, 4.45% to $56.52, its largest one day increase since May 2009.