Shares of Clean Energy Fuels Corp. (NASDAQ:

) are lower on the session by 1.30%, trading at $12.50. Overall call volume is now running at 2.24x the daily average, with 2% of all calls traded being purchases on the offer. 3,216 contracts have traded on the session so far. Clean Energy Fuels Corp. is a provider of natural gas as an alternative fuel for vehicle fleets in the United States and Canada. The company designs, builds, finances and operates fueling stations and supplies its customers with compressed natural gas (CNG) and liquefied natural gas (

).