Ownership Submission
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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(Print or Type Responses)
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

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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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