Navigator Holdings, a seaborne transportation company controlled by W.L. Ross & Co., has filed to raise up to $200 million through an IPO. The company is looking to list on the NYSE under the NVGS symbol. W.L. Ross owns a 60.6% pre-IPO position in the company stemming from two separate deals. The firm bought a 19.4% stake in March 2012 for $62.5 million, and subsequently acquired the rest of its stake the following September for an additional $110 million. Based in London, Navigator provides seaborne energy transportation services for energy companies, industrial users and commodity traders.