Iso (supermarket), a chain of Danish supermarkets incorporated into the SuperBest chain in 2007 Iso Omena ("Big Apple"), a shopping center in Finland Incentive stock option, a type of employee stock option Independent Sales Organization, a company that partners with an acquiring bank to provide merchant services Insurance Services Office, an American insurance underwriter Intermarket sweep order, a type of limit order on financial markets Iso (automobile), an Italian car manufacturer