Since its establishment, Unithai Group has remained true to its original aim: to work towards the economic development of Thailand. This long journey began with the creation of United Thai Shipping Corporation Limited in 1976 as a national line linking Thailand and the West.

As Thailand developed over the years, new challenges arose. In 1990, to serve the country's growing maritime sector, Unithai opened a major shipyard. In the mid-1990s, responding to the growing needs for containerized freight transport, the company opened the only fully equipped private Chao Phraya River terminal . The decade also saw the company moving into onshore and offshore logistics operations. In the new millennium, Unithai has diversified into serving the offshore oil and gas industry and established a shipbuilding unit, saving the country significant import costs.

Today, Unithai Group is a multi-faceted international organisation with primary business interests in shipping, logistics, shipyard and offshore-engineering operations, fully committed to the continued industrial, social and economic development of Thailand and the region.