Businessman

executive, business executive/associate/professional, member of the business community, business leader/manager/owner, professional, merchant, shopkeeper, entrepreneur, industrialist, financier, manager, investor, speculator, buyer, trader, capitalist, retailer, wholesaler, mogul, magnate, tycoon; businesswoman and businessman (if used in parallel ways). "Businessperson" is not recommended. Or, be specific: stockbroker, advertising executive, chief executive officer, public relations officer, wholesaler, banker. Plural: people in business, businesspeople.