Southern Archipelago Ltd., an investment holding company, provides contract sterilisation and polymerisation services in Singapore, Malaysia, and Indonesia. It operates in four segments: Investment Holding; Sterilisation; Property; and Hospitality and Wellness. The Sterilisation segment provides contract sterilisation, decontamination, and polymerisation services to the food packaging, medical devices, cosmetic, pharmacy, pharmacy packaging, and other consumer products. Its Investment Holding segment invests in transferable securities, such as marketable shares, warrants, and debentures, etc.