(CBS.MW) Rambus shares jumped to a two-year high on Wednesday after a federal court dismissed a shareholder lawsuit. The shares rose 6.4 percent to $17.50 recently. At their high for the session, the shares reached $18.82. The dismissal followed favorable rulings for Rambus in a federal appeals court in January stemming from the company's participation in a semiconductor trade group from 1991 to 1995. The dismissed shareholder suit had yet to be granted class-action status but had been consolidated in 2001. Wednesday's ruling was issued in the U.S. court for the northern district of California.