Registrar - Financial definition Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Tags: activities and occupations security issuance status or titles Concise definition of the term registrar Party or agent responsible for securities register maintenance and services. Browse the financial glossary in alpabetical order # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z