EXHIBIT 21 List of Subsidiaries of the Company The following is a list of Mentor Graphics Corporation operating subsidiaries. Mentor Graphics has no parent companies. 	 Subsidiary Percent owned Mentor Graphics (Canada) Limited 100% Mentor Graphics (Finland) OY 100% Mentor Graphics (France) SARL 100% Mentor Graphics (Deutschland) GmbH 100% Mentor Graphics Japan Co. Ltd. 100% Mentor Graphics (Netherlands) B.V. 100% Mentor Graphics (Singapore) PTE.LTD. 100% Mentor Graphics (Scandinavia) AB 100% Mentor Graphics (Schweiz) AG 100% Mentor Electronic Design SA [Spain] 100% Mentor Graphics (Taiwan) Co. Ltd. 100% Mentor Graphics (UK) Ltd. 100% Mentor Graphics (Denmark) 100% European Development Center, N.V. 74% Model Technology Incorporated 100% Anacad Computer Systems GmbH 100% CheckLogic Design Systems, Inc. 100%