Mr. Pickens is on the Board of CLNE but is not on the list of major stockholders.
Here’s another article from a knowledgeable analyst ...
Boone Pickens is the largest single share-holder of CLNE with 18,139,720 shares.
http://finance.yahoo.com/q/mh?s=CLNE+Major+Holders
He owns more than the top 10 Institutional holders (like Vanguard) put together.