Rackable (RACK, news, chart) shares have spiked higher and call volume is picking up. With shares move up 20 cents to $10.23, the focus is the September 12.5 calls. The spike in the share price happened during the past ten minutes and pushed shares up from $10.06 to a high of $10.49. 3,000 September 12.5 calls traded during that time in lots of 300 contracts or less, pushing up the premiums from a nickel to 20 cents. It all hints at speculative call buying and some sort of pending news.