http://www.bloomberg.com/apps/news?pid=20601084&sid=aInT95AgLzSo&refer=stocks

"Implied volatility for USEC Inc., the uranium provider that has fallen by almost two-thirds since May, rose to 83.40 percent, the highest in almost two weeks. An increase indicates traders anticipate bigger swings in the stock price.

Shares of USEC, the lone U.S. producer of enriched uranium to fuel nuclear power plants, gained 7.6 percent to $8.97 for the biggest advance in a month.

The second-most active options, January $10 calls, more than doubled to 60 cents. For those wagers to pay off, the stock must add 20 percent from yesterday's closing price before the options expire on Jen. 19.

The number of total USEC calls in existence increased to 119,834 yesterday, while puts declined to 43,563.

``The fact that open interest in call options on the company outpaces put open interest by a factor of 2.75 tells us that investors are banking on a rebound,'' Andrew Wilkinson, senior market analyst Interactive Brokers Group, wrote in a note to clients. The Greenwich, Connecticut-based market maker handles about a fifth of all options traded in the U.S. "