Established in 2017, Ocean Network Express (ONE) is a joint venture of the container line operations of three Japanese carriers: Kawasaki Kisen Kaisha, Ltd., known as 'K' Line; Mitsui O.S.K. Lines, Ltd., known as MOL; and NYK Line, or Nippon Yusen Kabushiki Kaisha (NYK).  

ONE’s combined fleet size initially totaled 1,550,000 TEU, ranking it the sixth-largest fleet in the world. ONE’s operations involve a fleet of over 250 vessels, including more than thirty super-large ships, such as 20,000 TEU container-ships. Covering over 100 countries around the world, ONE’s liner network links Asia with both coasts of North America; Europe with Asia; Europe with North America; West and Southeast Asia with China; and East Asia with Latin America. Although ONE’s holding company is located in Japan, its operational management is in headquartered in Singapore.  

The ONE fleet has become one of the largest carriers of both containerized imports from Asia to the United States, and containerized exports from the US to Asia.