Colex Holdings Limited, a 35-year veteran of waste management in Singapore and having pioneered many innovative value-added services which include the fully mechanized waste disposal vehicles and portable waste compactors used in the industry today, was listed on the Sesdaq ( currently known as Catalist ) in April 1999 and attained its ISO 9001:2000 certification in February 2003.

In 1999, Colex acquired Integrated Property Management Pte Ltd (IPM) and with this acquisition, Colex’s activities were extended to include contract cleaning of commercial, industrial and residential buildings. IPM attained its ISO 9001:2000 certification in September 2001.