Gaztransport & Technigaz

GTT (Gaztransport & Technigaz) is a French engineering company, headquartered in Saint-Rémy-lès-Chevreuse, that specializes in designing cryogenic membrane containment systems for transporting and storing liquefied natural gas (LNG) and other liquefied gases. GTT was formed in 1994 through the merger of Gaztransport and Technigaz — two rival LNG containment technology developers with roots dating to the 1960s — and now serves shipyards, shipowners, and energy companies worldwide, having been listed on Euronext Paris since 2014. The group has since expanded into digital and green-energy technologies through subsidiaries including Ascenz Marorka (smart shipping) and Elogen (green hydrogen electrolysers).