NEW YORK (TheStreet) -- Shares of Complete Production Services (CPX), Cobalt International Energy (CIE), Gran Tierra Energy (GTE) and ReneSola (SOL) made gains last week, while shares of First Solar (FSLR), Superior Energy Services (SPN), Chesapeake Midstream Partners (CHKM) and TransAtlantic Petroleum Ltd. (TAT) fell.Complete Production Services led the pack of winners last week, gaining 53.2%. Cobalt International Energy rose 26.4%. Gran Tierra Energy improved 25.3%. The company starts exploration drilling operations on two oil prospects in Brazil, as per International Resource News. ReneSola increased 23.8%. Other movers were Frontline Ltd. ( FRO) (up 23.0%), Oasis Petroleum ( OAS) (up 22.7%), Forest Oil Corp ( FST) (up 22.6%) and Denbury Resources Inc ( DNR) (up 22.0%).