Investors purchased roughly 850 calls at the Dec. 11 $19 strike for an average premium of $0.53 each, and snapped up nearly 700 of the Dec. '11 $20 strike calls at an average premium of $0.39 apiece. Call buyers at these strikes may profit at expiration next week in the event that shares in Research in Motion surge 6.7% and 11.4% over the current price of $18.30 to surpass the average breakeven prices of $19.53 and $20.39, respectively.