X0306 4 2013-08-19 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 25000 I Held by Child 2 Common Stock 25000 I Held by Child 1 Common Stock 15000 I By Trust 1 Common Stock 7000 I By Trust 3 Common Stock 2013-08-19 2013-08-19 5 Z false 29091 0 A 668907 I By Trust 2 Common Stock 2013-08-19 2013-08-19 5 Z false 29091 0 D 190831 D Common Stock 2013-10-28 2013-10-28 5 P false 10000 12.84 A 678907 I By Trust 2 Common Stock 2013-10-29 2013-10-29 5 P false 10000 12.81 A 688907 I By Trust 2 Shares held by IRA FBO Lip-Bu Tan DB Securities Inc. Custodian Rollover Account DTD 5/19/97. Reporting Person no longer has a pecuniary interest in the 25,000 shares held by Child 2, and therefore, no longer has a reportable indirect beneficial interest in such shares. Shares held by A&E Investment LLC, the sole member of which is the Lip-Bu Tan and Ysa Loo Trust dated 2/3/1992. Shares held by L Tan & N Lee & W Lee Trustees, Pacvan Walden Inc. Shares held by Lip-Bu Tan and Ysa Loo Trust dated 2/3/1992. Shares transferred to the Lip-Bu Tan and Ysa Loo Trust dated 2/3/1992. James J. Cowie, Attorney-in-Fact for Lip-Bu Tan 2013-10-30