Penta-Ocean Construction Co., Ltd. is a major Japanese construction firm. It specializes in marine works and land reclamation. It originated from Mizuno Gumi (水野組) in 1896 in Hiroshima Prefecture, and later renamed to the current name and capitalized in 1954. It has offices in Tokyo, Singapore, Hong Kong, Indonesia, Malaysia, Egypt, Sri Lanka, India, Thailand, Vietnam and Dubai.The company is listed on the Tokyo and Nagoya Stock Exchange.