From Longman Business Dictionary
bondholderbond·hold·er /ˈbɒndˌhəʊldəˈbɑːndˌhoʊldər/ noun [countableC]FINANCE a person or organization that owns bondsThe company can seek bankruptcy court approval for a reorganization plan if it receives approval from at least half of the bondholders
→ junior bondholder → senior bondholder