As of July 31, 2020, we had 5,943,657 shares of common stock, 1,853 shares of Series A 0% Convertible Preferred Stock issued and 133.8125 Series A 0% Convertible Preferred Stock outstanding, 1,000 shares of Series B 0% Convertible Preferred Stock issued and 71 Series B 0% Convertible Preferred Stock outstanding, 290.43148 shares of Series C 0% Convertible Preferred Stock issued and outstanding, 5,000 shares of Series D 0% Convertible Preferred Stock issued and outstanding, and 5,000 shares of Series E 0% Convertible Preferred Stock issued and outstanding. We additionally have issued an aggregate of $3,891,048 of senior convertible debentures and convertible notes that are convertible into common stock at any time, of which $2,563,710 is outstanding. Substantially all of the common shares and common shares underlying the Series A 0% Convertible Preferred, Series B 0% Convertible Preferred, Series C 0% Convertible Preferred, and Series D 0% Convertible Preferred are available for public sale, subject in some cases to volume and other limitations or delivery of a prospectus. As of July 31, 2020, we were obligated to reserve for issuance (i) 438 shares of our common stock issuable upon the conversion of 133.8125 shares of Series A 0% Convertible Preferred Stock including an additional number of common shares we are contractually obligated to reserve pursuant to our December 2015 offering; (ii) 473,334 shares of our common stock issuable upon the conversion of 71 shares of Series B 0% Convertible Preferred Stock including an additional number of common shares we are contractually obligated to reserve pursuant to our December 2016 offering; (iii) 50,782 shares of our common stock issuable upon the conversion of 290.43148 shares of Series C 0% Convertible Preferred Stock including an additional number of common shares we are contractually obligated to reserve pursuant to our March 2017 offering, (iv) 1,333 shares of common stock issuable upon the conversion of 5,000 shares of Series D 0% Convertible Preferred Stock, (v) 16,667 shares of common stock issuable upon the conversion of 5,000 shares of Series E 0% Convertible Preferred Stock, (vi) 5,519 shares of our common stock issuable upon exercise of outstanding warrants at a weighted average exercise price of $1,099.43 per share, including an additional number of common shares we are contractually obligated to reserve pursuant to our December 2015 offering, December 2016 offering and March 2017 offering, (vii) 225 shares of our common stock issuable upon exercise of outstanding stock options under our equity compensation plans at a weighted average exercise price of $1,793.78 per share and (viii) 104,537,108 shares of our common stock issuable upon conversion of our outstanding convertible notes/debentures. Subject to applicable vesting requirements and holding periods, upon conversion or exercise of the outstanding convertible notes, warrants and options, the underlying shares may be resold into the public market. Notwithstanding the foregoing, none of the shares of common stock underlying these convertible securities may be converted or exercised given that we have no shares of common stock available under our certificate of incorporation. We cannot predict if future issuances or sales of our common stock, or the availability of our common stock for sale, would harm the market price of our common stock or our ability to raise capital.
