The 2023 Notes had aggregate remaining balances, including accrued interest, amounting to approximately $0 and $2,715,582 as of September 30, 2022, and 2021, respectively. We incurred interest expense for the Convertible Promissory Notes in the amounts of approximately $1,114,767 and $425,567 for the years ended September 30, 2022, and 2021, respectively.
In connection with an amendment to the Convertible Promissory Notes, in November 2019, we also issued warrants to purchase 591,784 shares of our common stock to Dreamcatcher, LLC and warrants to purchase 591,785 shares of our common stock to Running Wind, LLC, for an aggregate of 1,183,569 shares of our common stock, exercisable at $2.55 per share for a period of 10 years. These warrants were automatically converted at the closing of the September 2022 Offering through cashless exercise into an aggregate of 578,847 shares of our common stock.
The 2022 Notes
From December 1, 2020, to June 1, 2021, we sold in a private placement, (i) $2,950,000 in aggregate principal amount of Senior Secured Promissory Notes due December 1, 2022, (the “2022 Notes”) and (ii) warrants to purchase 107,951 shares of our common stock at an exercise price of $8.25 per share. The investors in this private placement included entities controlled by Mr. Cassidy, who is a member of our Board of Directors. In connection with the offering, the entities controlled by Mr. Cassidy purchased an aggregate of $2,350,000 principal amount of the 2022 Notes and warrants to purchase an aggregate of 71,210 shares of our common stock at $8.25 per share. The warrants have a term of 10 years. The 2022 Notes had a maturity date of December 1, 2022. The 2022 Notes accrued interest in two different ways: (A) at the rate of 4% per annum, payable in cash, from the date of issuance of each note as follows: (1) interest from the issue date to November 30, 2021, payable in advance on the date the note was executed; (2) six months of cash interest payable in arrears on June 1, 2022; and (3) six months of cash interest payable in arrears on the maturity date; and (B) at the rate of 6% per annum, payable in shares of our common stock in arrears on June 1, 2021, December 1, 2021, June 1, 2022, and the maturity date.
The 2022 Notes converted simultaneously with the closing of the September 2022 Offering into an aggregate of 788,391 shares, based on the outstanding principal and interest of $3,153,579 as of September 26, 2022, at a conversion price of $4.00 per share (which was 80% of $5.00, the public offering price per share for the September 2022 Offering). Of this, an aggregate of 634,250 shares of common stock were issued to entities controlled by Mr. Cassidy, based on the outstanding principal and interest of $2,537,008 as of September 26, 2022, at a conversion price of $4.00 per share.
The 2022 Notes had aggregate remaining balances, including accrued interest, amounting to approximately $0 and $3,060,829 as of September 30, 2022, and 2021, respectively. We incurred interest expense for the 2022 Notes in the amounts of approximately $1,103,979 and $546,082 for the years ended September 30, 2022, and 2021, respectively.
The 2020 and 2021 Share Offering
Beginning on August 15, 2020, and through May 18, 2021, we offered and sold in a private placement to accredited investors $6,705,000 of shares of common stock at a price of $3.75 per share. The investors in this private placement included an entity controlled by Mr. Cassidy, who is a member of our Board of Directors, which invested $1,200,000 for a total of 320,000 shares of common stock.
The 2021 Share and Warrant Offering
On September 30, 2021, we entered into securities purchase agreements with accredited investors pursuant to which we sold, in a private offering (i) an aggregate of 1,924,486 shares of our common stock and (ii) warrants to purchase up to an aggregate of 2,191,150 shares of common stock. Each investor was entitled to purchase one share of common stock and one warrant to purchase one share of common stock for an aggregate purchase price of $3.75. The warrants were immediately exercisable, have a three-year term and an exercise price of $8.25 per share. The investors in the offering included an entity controlled by Mr. Cassidy, who is a member of our Board of Directors. The entity controlled by Mr. Cassidy purchased 106,666 shares of common stock and warrants to purchase 106,666 shares of common stock in the offering, for gross proceeds of $400,000. Other investors in this offering were entities controlled by Jeremy Boczulak, who, as a result of these investments, became a beneficial holder of more than 5% of our common stock. Pursuant to the