There are Jinling Shipbuilding, Shuntian Shipbuilding, Global Shipbuilding, Guoyu Shipbuilding, Changrun Hao Yun Shipbuilding and Sentosa Shipbuilding.
The whole Yizheng river bank is. It is easy to find. It's not much money to take a taxi from Yizheng city, but it's inconvenient to walk down one by one. Better drive yourself!