provision whereby a September 2023 Warrant could be exchanged cashlessly for shares of common stock at the rate of 0.999 of a share of common stock per full share otherwise issuable upon a cash exercise. The combined purchase price for one share of common stock and accompanying September 2023 Warrant to purchase shares of common stock was $9.00. The aggregate net proceeds from the September 2023 RDO, after deducting the fees payable to financial advisors and other estimated offering expenses, were approximately $4.1 million (see Note 6). The fair value of the September 2023 Warrants upon issuance was $1.9 million and such amount was included within warrant liabilities, at fair value on the consolidated balance sheets. On September 26, 2023 and September 27, 2023, the holders of the September 2023 Warrants elected to cashlessly exchange their September 2023 Warrants in full for an aggregate issuance of 74,075 and 259,260 shares of common stock, respectively, and, thereafter, no September 2023 Warrants remain outstanding. As a result of the exercise of the September 2023 Warrants, we recognized a $100,000 expense within change in fair value of warrant liabilities on the consolidated statement of operations and comprehensive loss.
On March 10, 2023, we entered into a Securities Purchase Agreement (the “March 2023 Securities Purchase Agreement”) with a life sciences - focused investment fund (the “Investor”), pursuant to which, on March 14, 2023, we issued and sold an aggregate of 401,977 shares of common stock, pre - funded warrants exercisable for an aggregate of 311,357 shares of common stock (the “March 2023 Pre - Funded Warrants”) and accompanying common warrants exercisable for an aggregate of 891,667 shares of common stock in a registered direct offering (the “March 2023 RDO”), resulting in total net proceeds of $10.4 million, after deducting financial advisor fees and other offering expenses (see Note 6). On May 19, 2023, we entered into Amendment No. 1 to the March 2023 Securities Purchase Agreement (the “2023 Purchase Agreement Amendment”), pursuant to which the Investor agreed to, among other things, waive certain restrictions on issuing and registering shares of common stock contained within the March 2023 Securities Purchase Agreement to permit us to make the May Through September Payments (as defined below) in a combination of cash and shares of common stock as contemplated in the 2021 Note Amendment (as defined below). In consideration for entering into the 2023 Purchase Agreement Amendment, on May 19, 2023, we issued to the Investor warrants to purchase up to an aggregate of 133,334 shares of common stock. The fair value of these warrants upon issuance was $3.2 million and such amount is included within loss on extinguishment of debt on the consolidated statement of operations and comprehensive loss. On July 3, 2023 and September 19, 2023, the holders of the March 2023 Pre - Funded Warrants exercised their March 2023 Pre - Funded Warrants on a cashless basis for an issuance of an aggregate of 90,667 and 220,394 shares of common stock, respectively, and, thereafter, no March 2023 Pre - Funded Warrants remain outstanding.
On May 12, 2022, we entered into an Open Market Sale AgreementSM (the “Sale Agreement”) with Jefferies LLC, as sales agent (the “Agent”), pursuant to which we were able to offer and sell shares of our common stock from time to time through the Agent (the “ATM Offering”). We also filed a prospectus supplement, dated May 12, 2022, with the SEC in connection with the ATM Offering (the “Prospectus Supplement”) under our Prior Registration Statement. Pursuant to the Prospectus Supplement, we were able to offer and sell shares having an aggregate offering price of up to $50.0 million. Effective as of November 27, 2023, we voluntarily terminated the Sale Agreement with no penalty. During the term of the Sale Agreement, we sold an aggregate of 14,193 shares of our common stock for aggregate gross proceeds to the Company of approximately $540,898.13.
As of December 31, 2023, we had $250.0 million available under a shelf registration statement on Form S-3 (File No. 333- 276119) filed with the SEC on December 18, 2023, which was declared effective on December 27, 2023 (the “New Shelf Registration Statement”). As of the date hereof, a total of $246 million of securities remains available for issuance pursuant to the New Shelf Registration Statement. However, for so long as our public float remains less than $75 million, in no event will we sell securities pursuant to shelf registration statements, including pursuant to the New Shelf Registration Statement, with a value more than one-third of the aggregate market value of our common stock held by non-affiliates in any 12-month period.
On November 23, 2021, we entered into a Securities Purchase Agreement (the “Securities Purchase Agreement”) with Lind Global Asset Management V, LLC (“Lind V”) pursuant to which, among other things, on November 23, 2021, we issued and sold to Lind V, in a private placement transaction, in exchange for the payment by Lind V of $20.0 million, (1) a convertible promissory note (the “2021 Note”) in an aggregate principal amount of $22.0 million, which bore no interest until the first anniversary of the issuance of the First Note and will thereafter bore interest at a rate of 5% per annum until October 1, 2023 when the First Note began to bear interest at an annual rate of 12% per annum, and mature on November 23, 2024, and (2) 17,826 shares of our common stock.
See Note 9 to our consolidated financial statements for further discussion.
On December 2, 2021, we entered into two separate securities purchase agreements with certain accredited investors on substantially the same terms as the Securities Purchase Agreement, pursuant to which we sold, in private placement transactions, in exchange for