EXHIBIT 21 QMS, INC. SUBSIDIARIES AND TRADE NAMES Unless indicated otherwise, each of the following is a wholly owned subsidiary of QMS, Inc. State or Other Jurisdiction of Other Names Under Which Legal Name of Subsidiary Incorporation Subsidiary Does Business ---------------------------- --------------- ------------------------ QMS Circuits, Inc. Delaware QCI QMS Foreign Sales, Inc. U.S. Virgin Islands QMS K.K. Japan QMS Canada, Inc. Canada As of November 10, 1998