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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
813672	Cadence Design Systems Inc	CDNS	Services-Prepackaged Software (7372)	770148231

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1008463	Bu Lip Tan	2655 Seely Avenue, Bldg 5 San Jose CA 95134	President And Ceo	No	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-02-08	12,600	$9.72	142,386	No	4	P	Indirect	By Trust
Common Stock	Acquisiton	2011-02-08	6,000	$9.79	148,386	No	4	P	Indirect	By Trust
Common Stock	Acquisiton	2011-02-08	6,400	$9.84	31,400	No	4	P	Indirect	Held By IRA
Common Stock	Acquisiton	2011-02-08	100,000	$0.00	558,332	No	4	A	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Trust
No	4	P	Indirect	By Trust
No	4	P	Indirect	Held By IRA
No	4	A	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Option (right to buy)	Acquisiton	2011-02-08	800,000	$0.00	800,000	$9.66

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
800,000		2018-02-08	No	4	A	Direct

Footnotes

Amount of Shares Beneficially Owned Following Reported Transaction includes: (i) 1,000 shares held by L Tan & N Lee & W Lee Trustees Pacven Walden Inc. 401(k) PSB FBO Lip-Bu Tan; (ii) 136,286 shares held by Lip-Bu Tan and Ysa Loo Tan dated 2/3/1992 (including 991 share acquired through the Cadence Design Systems, Inc. Employee Stock Purchase Plan on January 31, 2011), and (iii) 5,000 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
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) 136,386 shares held by Lip-Bu Tan and Ysa Loo Trust dated 2/3/1992; and (iii) 5,000 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 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.