Note 7 — Common and Preferred Stock

Private Placement

In November 2019, the Company entered into a securities purchase agreement with certain institutional and accredited investors, including Dr. Lon E. Bell, former Chairman of the Board and Chief Executive Officer, for a private placement of the Company’s common stock and warrants to purchase common stock for aggregate gross proceeds of $3.5 million and net proceeds of $3.1 million (the “2019 Offering”). The 2019 Offering closed on November 13, 2019. In the 2019 Offering, the Company issued an aggregate of (i) 544,950 shares of common stock at $2.4763 per share and (ii) pre-funded Series B warrants to purchase 868,443 shares of common stock that are immediately exercisable and have no expiration date, at a price of $2.4763 less a nominal exercise price of $0.001 per pre-funded warrant. The Company also issued to the investors Series A warrants to purchase up to an aggregate of 1,766,751 shares of common stock at an exercise price of $2.32 per share that are immediately exercisable and will expire five years from the issuance date. As compensation to the placement agent in the 2019 Offering, in addition to a cash fee for its services, the Company also issued to the placement agent a warrant to purchase up to 70,670 shares of common stock, with an exercise price of $2.9716 per share. The other terms of the placement agent warrant are substantially the same as the investor warrants.

Preferred Stock

The Company is authorized to issue 10,000,000 shares of preferred stock.

In February 2019, a shareholder converted 708,430 shares of preferred stock to 70,843 shares of common stock. On December 12, 2019, a shareholder converted 810,000 shares of preferred stock to 81,000 shares of common stock. At September 30, 2020 and December 31, 2019, there was no preferred stock outstanding.

Stock Issuance

In April 2020, the Company issued 26,316 unregistered shares of common stock, valued at $50,000 at the time of issuance, to a third-party vendor as compensation for services performed.