Rambus shares are off 30c to $17.80 and option volume is 2x daily average. Notable selling of Jan. ITM calls with a 3,000 contract block of the $16 calls, total of 4,200 traded and 1,500 of the $15 calls at the bid. Also, the Jan. $17.50 put has saw a 2,700 contract block go at the bid. Open interest is sufficient to cover all so could be liquidating.