Moriondo came from an entrepreneurial family.[3] His grandfather founded a liqueur producing company that was continued by his father Giacomo, who later founded the chocolate company Moriondo and Gariglio, along with his brother Agostino and cousin Gariglio. Angelo purchased the Grand-Hotel Ligure in the city-centre Piazza Carlo Felice and the American Bar in the Galleria Nazionale of Via Roma.[4]