Nereus Pharmaceuticals was a pharmaceutical company focused on the development of natural products from marine microbial and other natural sources into small molecule human therapeutics.

[4] The major disease area addressed by Nereus is cancer.

Nereus was purchased by Triphase Research and Development in 2012.

[5] Until 2004, Nereus used methods licensed from the University of California, San Diego to retrieve and cultivate marine microorganisms, particularly bacteria in the Actinomycetia class and organisms belonging to Kingdom Fungi.

[4] Since 2004, the company has focused on commercializing identified bioactive natural products.