What stock exchange is XXX on?
TGS-NOPEC Geophysical Company
TGS-NOPEC Geophysical Company, referred to as TGS and listed on the Oslo Stock Exchange, was founded by a 1998 merger of TGS (Tomlinson Geophysical Services Inc.), Calibre Geophysical Co. Inc (founded 1981), and NOPEC (NOrwegian Petroleum Exploration Consultants) International ASA founded in 1981, with financial headquarters in Oslo, Norway.
Oslo Stock Exchange