In March 2021, we entered into a common stock sales agreement (the “2021 ATM Agreement”) under which we are authorized to sell up to an aggregate of $50.0 million in gross proceeds through the sale of shares of common stock from time to time in “at-the-market” equity offerings (as defined in Rule 415 promulgated under the Securities Act of 1933, as amended). We agreed to pay a commission of up to 3% of the gross proceeds of any common stock sold under this agreement. During the year ended December 31, 2021, we issued and sold a total of 172,879 shares of common stock under the 2021 ATM Agreement resulting in net proceeds of approximately $9.3 million.
In October 2021, we completed a public offering of 666,666 shares of our common stock and warrants to purchase 333,333 shares of our common stock at a combined price of $34.00 per share of common stock and one-half of a warrant to purchase one share of common stock. Proceeds from the public offering, net of underwriting discounts, commissions and offering expenses were approximately $21.1 million.
In January 2022, we entered into a common stock sales agreement (the “January 2022 ATM”) under which we are authorized to sell up to an aggregate of $50.0 million in gross proceeds through the sale of shares of common stock from time to time in “at-the-market” equity offerings (as defined in Rule 415 promulgated under the Securities Act of 1933, as amended). We agreed to pay a commission of up to 3% of the gross proceeds of any common stock sold under this agreement. During the nine months ended September 30, 2022 we issued and sold a total of 25,623 shares of common stock under the January 2022 ATM resulting in net proceeds of approximately $0.3 million. On April 26, 2022, we terminated the January 2022 ATM.
On March 13, 2022, we entered into a Securities Purchase Agreement (the “Purchase Agreement”) with a single healthcare-focused institutional investor (the “Purchaser”), pursuant to which the Company issued, in a registered direct offering (the “2022 Preferred Stock Offering”), 2,425 shares of Series A convertible preferred stock (the “Series A Preferred Stock”) and 2,425 shares of Series B convertible preferred stock (the “Series B Preferred Stock”) and Series A warrants (the “Series A Warrants”) to purchase up to an aggregate of 606,250 shares of the common stock of the Company and Series B warrants (the “Series B Warrants”) to purchase up to an aggregate of 606,250 shares of common stock. Each share of Series A Preferred Stock and Series B Preferred Stock has a stated value of $1,000 per share and a conversion price of $8.00 per share. The shares of preferred stock issued in the offering are convertible into an aggregate of 606,250 shares of common stock. The Series A Warrants have an exercise price of $10.40 per share, will become exercisable six months following the date of issuance, and will expire 5 years following the initial exercise date. The Series B Warrants have an exercise price of $10.40 per share, will become exercisable six months following the date of issuance, and will expire one and one-half years following the initial exercise date. The Purchase Agreement contains customary representations and warranties and agreements of the Company and the Purchaser and customary indemnification rights and obligations of the parties. Total gross proceeds from the 2022 Preferred Stock Offering, before deducting the placement agent's fees and other estimated offering expenses, are $4.9 million. The 2022 Preferred Stock Offering closed on March 14, 2022.
On April 25, 2022, we entered into a letter agreement and waiver (the “Letter Agreement”) with Armistice Capital Master Fund Ltd. (“Armistice”), pursuant to which Armistice consented to us entering into and effecting an at-the-market (“ATM”) offering facility. Pursuant to the Letter Agreement, we issued to Armisitice a new common stock purchase warrant (“New Warrant”), on the same terms and conditions as the Series A Warrants, provided that such New Warrant shall be exercisable into 212,188 warrant shares, subject to adjustment thereunder. The Series A Warrants have an exercise price of $10.40 per share, and will become exercisable six months following the date of issuance, and will expire 5 years following the initial exercise date.
On April 27, 2022, we entered into a new at-the-market offering program (the “April 2022 ATM”) with H.C. Wainwright LLC, and Co. (the “Sales Agent”) under which we were authorized to sell up to an aggregate of $12,841,000 in gross proceeds through the sale of shares of common stock from time to time in “at the market” equity offerings (as defined in Rule 415 promulgated under the Securities Act of 1933, as amended). We agreed to pay a commission of up to 3% of the gross proceeds of any common stock sold under this agreement. Through September 30, 2022, we issued and sold a total of 8,687,502 shares of common stock under the April 2022 ATM, representing the entire capacity of the April 2022 ATM, resulting in net proceeds of approximately $12.2 million. On August 22, 2022, the we increased the April 2022 ATM (“August 2022 ATM”). As increased, we may now offer and sell shares of the Company’s common stock having an aggregate offering price of up to$75.0 million.
On July 6, 2022, we completed a best efforts public offering (the “Offering”) in which we raised net proceeds of $22.0 million through the sale of 19,148,332 shares of common stock and 7,518,334 pre-funded warrants (“Series B pre-funded warrants”) to purchase 7,518,334 shares of common stock. Both the sales of shares of common stock and