X0304 4 2012-02-06 false 0000813672 CADENCE DESIGN SYSTEMS INC CDNS 0001008463 TAN LIP BU 2655 SEELY AVENUE, BLDG 5 SAN JOSE CA 95134 true true false false President and CEO Common Stock 31400 I Held By IRA Common Stock 2012-02-06 4 A false 140000 0 A 456664 D Common Stock 2012-02-06 4 Z false 75000 0 A 545755 I By Trust Common Stock 2012-02-06 4 Z false 75000 0 D 381664 D Common Stock 2012-02-08 4 F false 7780 11.76 D 373884 D Common Stock 2012-02-08 4 F false 7779 11.76 D 366105 D Non-Qualified Stock Option (right to buy) 11.62 2012-02-06 4 A false 500000 11.62 A 2019-02-06 Common Stock 500000 500000 D Shares held by IRA FBO Lip-Bu Tan DB Securities Inc. Custodian Rollover Account DTD 5/19/97. Grant of performance based incentive stock. Option vests at a rate of 1/48th per month. Amount of securities beneficailly owned includes 701 shares acquired by the reporting person through the Employee Stock Purchase Plan on January 31, 2012 Amount of shares beneficially owned following reported transaction includes: (i) 7,000 shares held by L Tan & N Lee & W Lee Trustees Pacven Walden Inc. 401(k) PSB FBO Lip-Bu Tan; (ii) 523,755 shares held by Lip-Bu Tan and Ysa Loo Tan dated 02/03/1992 (including 701 shares acquired through the Cadence Design Systems, Inc., Employee Stock Purchase Plan on January 31, 2012), and (iii) 15,000 shares held by A&E Investment LLC, the sole member of which is the Lip-Bu Tan and Ysa Loo Trust Shares transferred to the Lip-Bu Tan and Ysa Loo Trust dated 02/03/1992. Shares withheld to satisfy tax obligations arising out of vesting of restricted stock. James J. Cowie, Attorney-in-Fact for Lip-Bu Tan 2011-02-08