PEIX - Maybe this will help from the latest proxy statement:
To be able to vote, you must have been a stockholder on April 24, 2014, the record date for determination of stockholders entitled to notice of and to vote at the Annual Meeting. As of the record date, 20,078,441 shares of our common stock, par value $0.001 per share (“common stock”), and 926,942 shares of our Series B Cumulative Convertible Preferred Stock, par value $0.001 per share (“Series B Preferred Stock”), were issued and outstanding.
I would assume that this figures would encompass all warrants that have been exercised.