X0202 4 2006-01-19 0 0000917273 RAMBUS INC RMBS 0001192521 EULAU ROBERT K 4440 EL CAMINO REAL LOS ALTOS CA 94022 0 1 0 0 Chief Financial Officer Common Stock 2006-01-19 4 M 0 15000 9.07 A 32216 D Common Stock 2006-01-19 4 S 0 15000 34.225 D 17216 D Common Stock 2006-01-20 4 M 0 15000 9.07 A 32216 D Common Stock 2006-01-20 4 S 0 15000 34.0934 D 17216 D Common Stock 2006-01-23 4 M 0 15000 9.07 A 32216 D Common Stock 2006-01-23 4 S 0 15000 35.2937 D 17216 D Common Stock 2006-01-23 4 M 0 100 9.07 A 17316 D Common Stock 2006-01-23 4 S 0 100 36 D 17216 D Employee Stock Option 02 9.07 2006-01-19 4 M 0 15000 0 D 2001-11-01 2011-06-21 Common Stock 15000 188612 D Employee Stock Option 02 9.07 2006-01-20 4 M 0 15000 0 D 2001-11-01 2011-06-21 Common Stock 15000 173612 D Employee Stock Option 02 9.07 2006-01-23 4 M 0 15000 0 D 2001-11-01 2011-06-21 Common Stock 15000 158612 D Employee Stock Option 02 9.07 2006-01-23 4 M 0 100 0 D 2001-11-01 2011-06-21 Common Stock 100 158512 D The sale reported on this Form 4 is effective pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 19, 2004. This option vests monthly and becomes fully vested on 5/01/2006. By: Raquel Peasley For: Robert Eulau 2006-01-23