Exhibit 21.01 SUBSIDIARIES OF THE REGISTRANT The Registrant's subsidiaries and the state or country in which each is incorporated or organized, are as follows: Accent S.r.l. .............................................Italy Cadence China Ltd. ........................................Hong Kong Cadence Design Systems (Canada) Ltd .......................Canada Cadence Design Systems (India) Private Ltd. ...............India Cadence Design Systems (Ireland), Ltd. ....................Ireland Cadence Design Systems (Israel) Ltd .......................Israel Cadence Design Systems (Japan) B.V. .......................Netherlands Cadence Design Systems (S) Pte Ltd. .......................Singapore Cadence Design Systems I B.V. .............................Netherlands Cadence Design Systems III B.V. ...........................Netherlands Cadence Design Systems AB .................................Sweden Cadence Design Systems AG .................................Switzerland Cadence Design Systems Asia Ltd. ..........................Hong Kong Cadence Design Systems B.V. ...............................Netherlands Cadence Design Systems GmbH ...............................Germany Cadence Design Systems, Ltd ...............................United Kingdom Cadence Design Systems S.A.S. .............................France Cadence Design Systems S.r.l. .............................Italy Cadence International Sales Corporation ...................U.S. Virgin Islands Cadence Korea Ltd. ........................................Korea Cadence Taiwan, Inc........................................Taiwan Castlewilder ..............................................Ireland Cooper & Chyan Technology FSC, Inc. .......................Barbados Cooper & Chyan Technology GmbH ............................Germany Cooper & Chyan Technology, Inc. ...........................U.S. Cooper & Chyan Technology KK ..............................Japan Cooper & Chyan Technology, Ltd. ...........................United Kingdom Cooper & Chyan Technology S.A.R.L. ........................France European CAD Developments Ltd. ............................Germany High Level Design Systems, Ltd. ...........................United Kingdom Integrated Measurement Systems, Inc. ......................U.S. Redwood Design Automation, Ltd. ...........................United Kingdom River Oaks Place Association ..............................U.S. Seeley Properties, Inc. ...................................U.S. Simon Software, Inc. ......................................U.S. Synthesia AB ..............................................Sweden Telos Venture Partners ....................................U.S. Unicad, Inc. ..............................................U.S. UVW Ltd ...................................................United Kingdom Valid Europe BVBA .........................................Belgium 3005353 Nova Scotia ......................................Nova Scotia