Winmark Investment Holdings Ltd, formerly Serrano Limited, is a provider of interior fit-out solutions for property development and refurbishment projects in Singapore and Southeast Asia. Its portfolio includes residential, hospitality, retail and commercial sectors. It operates through two segments: interior fit-out business, and wholesale and retail furnishings business. The interior fit-out segment is engaged in the business of customization, manufacture, supply and installation of paneling products, and construction and installation of interior fit-out works for interior spaces, including the supply and installation of paneling products, other furnishings, partitions, and mechanical and electrical works. The wholesale and retail furnishings segment is engaged in the manufacture and supply of a range of furnishings for home, office and commercial use to various wholesale customers in Singapore, Vietnam and Cambodia, as well as retail customers in Singapore and Vietnam.