TK $40.50 is the mother company Teekay, primarily an oil tanker company, and TGP $27.38 is a spin-off Teekay LNG Partners, the liquid natural gas carrier.
TGP just acquired two more LNG carriers via mother company Teekay from Conoco and Marathon Oil.
"Teekay LNG Partners L.P. is a publicly-traded master limited partnership formed by Teekay Corporation (NYSE:TK - News) as part of its strategy to expand its operations in the LNG and LPG shipping sectors. Teekay LNG Partners L.P. provides LNG, LPG and crude oil marine transportation services under long-term, fixed-rate time charter contracts with major energy and utility companies through its fleet of thirteen LNG carriers, four LPG carriers and eight Suezmax class crude oil tankers. Six of the thirteen LNG carriers are newbuildings scheduled for delivery between the second quarter of 2008 and early 2009. Three of the four LPG carriers are newbuildings scheduled for delivery between mid-2008 and mid-2009."