From Longman Business Dictionarysecurities houseseˈcurities ˌhouse FINANCEORGANIZATIONSan organization that ISSUEs (=makes available and sells) companies’ shares, bonds etc, trades in shares, bonds etc for itself and for its clients, and provides other financial services to companies. Most securities houses form part of large international financial institutionsBear Stearns, the Wall Street securities house, upgraded its recommendation on shares in Heinz to ‘buy’. → house