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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
917273	Rambus Inc	RMBS	Semiconductors & Related Devices (3674)	943112828

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1192508	Mark Horowitz	4440 El Camino Real Los Altos CA 94022		Yes	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	2010-02-01	3,500	$0.00	1,006,202	No	4	A	Direct
Common Stock	Disposition	2010-02-01	1,320	$22.72	1,004,882	No	4	F	Direct
Common Stock	Disposition	2010-02-02	467	$22.78	1,004,415	No	4	F	Direct
Common Stock	Disposition	2010-02-01	20,000	$22.36	67,239	No	4	S	Indirect	Jointly with spouse

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	A	Direct
No	4	F	Direct
No	4	F	Direct
No	4	S	Indirect	Jointly with spouse

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Acquisiton	2010-02-01	10,000	$0.00	10,000	$22.72

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
10,000	2010-08-01	2020-02-01	No	4	A	Direct

Footnotes

Shares are represented by restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Rambus Inc. common stock. The restricted stock units vest in four equal annual installments beginning on February 1, 2011 or the first trading day after February 1, 2011.
The sale reported was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 5, 2009.
The sale price reported in column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $22.06 and $22.61 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
Shares held directly by the Mark Horowitz & Jody Buckley Living Trust dated June 21, 2003 for which the Reporting Person serves as a trustee.
One-tenth of the shares subject to the option vest on August 1, 2010 and one fifty-fourth of the shares shall vest monthly thereafter.