<Page> Exhibit 21 Subsidiaries of the Registrant ------------------------------ <Table> <Caption> Percentage of Voting Securities State of Owned By Incorporation Registrant ------------- ---------- Compupower Corporation Delaware 100% Value Line Securities, Inc. New York 100% The Vanderbilt Advertising Agency, Inc. New York 100% Value Line Publishing, Inc. New York 100% Value Line Distribution Center, Inc. New Jersey 100% </Table> 42