Established in May 2007, Nantong Tank Container Co., Ltd. (NTtank) is a professional ISO tank container manufacturer located in Nantong, Jiangsu, China, which is close to Shanghai.

NTtank is the first wholly owned subsidiary of Square Technology Group. (Stock Code:603339). Besides NTtank, the group has other five wholly owned subsidiaries and a research institute.

NTtank supplies both standard ISO UN Portable tanks and customized special tanks, with an annual capacity of 8,000 standard ISO tanks and 2,000 multi-type special tanks.