The Los Altos, Calif., chipmaker was notified by Nasdaq Wednesday that it is in violation of listing guidelines. Last week, the company warned that it would miss a quarterly filing deadline with the
Securities and Exchange Commission
and would attempt to file "as soon as practicable."
The company has said that a "significant number" of stock options granted from 1998 to 2001 were misdated and that it would have to restate its results and take charges of more than $200 million.
The options practices in question came during a time when former CEO Geoff Tate ran the company and served on the stock option committee. Tate resigned from the company's board in August.
Rambus shares were down 33 cents to $20.79 in pre-market trading Monday.