additional 1,063,939 shares of common stock for proceeds of $3,700. There were 0 and 839,952 warrants outstanding as of December 31, 2020 and 2019, respectively.
On June 8, 2020, the Company issued 3,106 and 430 shares of common stock to the Company’s Chief Medical Officer and another employee, respectively. In addition, on June 19, 2020, the Company issued 402,000 and 320,000 shares of common stock to the Company’s Chief Financial Officer and Chief Operating Officer ("the CFO and COO") and Chief Strategy and Innovation Officer ("the CSIO"), respectively. The shares were issued in exchange for services rendered and 0 cash considerations. These issuances resulted in $9,432,000 in stock compensation expenses.
Each holder of outstanding shares of common stock shall be entitled to 1 vote in respect of each share. The number of authorized shares of common stock may be increased or decreased by the affirmative vote of a majority of the outstanding shares of common stock and preferred stock voting together as a single class.
The Company has never paid dividends and has 0 plans to pay dividends on common stock. As of December 31, 2017, the Company adopted the Plan. On September 25, 2019, the board of directors approved an additional 10,000,000 shares to be reserved and authorized under the Plan. This approval increased the total number of authorized shares from 20,000,000 to 30,000,000. After the reverse stock splits, the total number of authorized shares was updated to 858,615. On June 19, 2020, the board of directors approved an additional 850,000 shares to be reserved and authorized under the Plan. This approval increased the total number of authorized shares from 858,615 to 1,708,615.
There were 270,933 shares and 258,813 shares available for issuance as of December 31, 2020 and 2019, respectively.
Series A-1 Preferred Stock—In the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company or the occurrence of a liquidation the holders of the shares of Series A-1 Preferred Stock then outstanding shall be entitled to be paid out of the assets of the Company available for distribution to its stockholders, before any payment shall be made to the holders of common stock by reason of their ownership thereof, an amount per share equal to $0.50, the original issue price.
On matters submitted to a vote of the stockholders of the Company, Series A-1 Preferred Stock and common stock vote together as one class, with the vote of the Series A-1 Preferred Stock on an as-converted basis. Each holder of Series A-1 Preferred Stock shall have a number of votes equal to the shares of common stock into which the shares of Series A-1 Preferred Stock held by such holder are then convertible.
With respect rights on liquidation, winding up and dissolution, shares of the Series A-1 Preferred Stock rank senior to all shares of common stock.
Each share of Series A-1 Preferred Stock is convertible at any time at the option of the holder at the then current conversion rate. In addition, upon the closing of the sale of shares of common stock to the public in an initial public offering pursuant to an effective registration statement under the Securities Act of 1933, as amended, all shares of preferred stock shall automatically be converted into shares of common stock at the then effective conversion rate.
In connection with the IPO, all shares of the Company's Series A-1 Preferred Stock were converted into 624,594 shares of common stock.
Series B Preferred Stock—On September 13, 2019, the Company amended and restated its certificate of incorporation to authorize the issuance of up to 14,130,435 shares of Series B Preferred Stock. On September 13, 2019, the Company sold 7,608,696 shares of Series B Preferred Stock for $3,500,000. On November 13, 2019, the Company issued an additional 2,173,913 shares of Series B Preferred Stock for $1,000,000. In connection with the sale of the Series B Preferred Stock, each investor was issued warrants to purchase 0.0859 shares of common stock for each share of Series B Preferred Stock purchased at a price of $0.003494 per share of common stock ("Warrants"). See below for further details.
Until the filing of the amended and restated certificate of incorporation on December 16, 2019, shares of Series B Preferred Stock had accrued unpaid dividends at an annual rate of 6% per share. The amended and restated certificate of incorporation eliminated the clause requiring the dividend accrual. In addition, on December 6, 2019, the Series B Preferred Stock investors voted in favor of forfeiting all accrued and unpaid dividends, along with all future dividends. In exchange, the Company issued 87,050 shares of Series B Preferred Stock to the investors. The Company treated this transaction as accretion and settlement of a Series B Preferred Stock dividends in the amount of $40,000. Accordingly, additional paid-in capital was reduced by $40,000.