In preparation for a public listing, Hyflux Pte Ltd was incorporated on 31 March 2000 to assume the role of an investment holding company for the Group. Hydrochem became a wholly-owned subsidiary of Hyflux. Subsequently on 20 December, Hyflux Pte Ltd was converted to a public limited company and the name was changed to Hyflux Ltd.
On 9 January 2001, Hyflux launched its initial public offering, and on 17 January, Hyflux shares began trading on the secondary board of the Singapore Exchange (SGX). Hyflux was the first water treatment company to be listed in Singapore. On 14 April 2003, Hyflux was promoted to the SGX mainboard, having met all requirements for a mainboard listing.