FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * STARK LAURA   2. Issuer Name and Ticker or Trading Symbol RAMBUS INC [RMBS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Senior Vice-President (Last) (First) (Middle) 4440 EL CAMINO REAL 3. Date of Earliest Transaction (Month/Day/Year) 05/01/2006 (Street) LOS ALTOS, CA 94022 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/01/2006   M   7,392 A $ 14.8281 31,308 D   Common Stock 05/01/2006   S   7,392 D $ 37.9419 23,916 D   Common Stock 05/01/2006   M   12,608 A $ 15.3125 36,524 D   Common Stock 05/01/2006   S   12,608 D $ 37.9419 23,916 D   Common Stock 05/02/2006   M   3,772 A $ 15.3125 27,688 D   Common Stock 05/02/2006   S   3,772 D $ 38.6622 23,916 D   Common Stock 05/02/2006   M   16,000 A $ 15.6719 39,916 D   Common Stock 05/02/2006   S   16,000 D $ 38.6622 23,916 D   Common Stock 05/02/2006   M   228 A $ 15.6719 24,144 D   Common Stock 05/02/2006   S   228 D $ 38.6622 23,916 D   Common Stock 05/03/2006   M   19,772 A $ 15.6719 43,688 D   Common Stock 05/03/2006   S   19,772 D $ 36.5216 23,916 D   Common Stock               9,335 I by Spouse

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Employee Stock Option 07

$ 14.8281

05/01/2006

M

7,392

02/01/2002(1)

11/05/2008

Common Stock

7,392

$ 0

0

D

Employee Stock Option 08

$ 15.3125

05/01/2006

M

12,608

01/31/2000(1)

02/18/2009

Common Stock

12,608

$ 0

3,772

D

Employee Stock Option 08

$ 15.3125

05/02/2006

M

3,772

01/31/2000(1)

02/18/2009

Common Stock

3,772

$ 0

0

D

Employee Stock Option 17

$ 15.6719

05/02/2006

M

228

01/31/2003(2)

10/20/2009

Common Stock

228

$ 0

159,772

D

Employee Stock Option 17

$ 15.6719

05/03/2006

M

19,772

01/31/2003(2)

10/20/2009

Common Stock

19,772

$ 0

140,000

D

Employee Stock Option 19

$ 15.6719

05/02/2006

M

16,000

10/31/2002(1)

10/20/2009

Common Stock

16,000

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
STARK LAURA 4440 EL CAMINO REAL LOS ALTOS, CA 94022			Senior Vice-President

Signatures

By: RAQUEL PEASLEY For: LAURA S. STARK		05/03/2006
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This option is fully vested.
(2)	This option vests monthly and becomes fully vested on 12/31/2004.

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