Warrants - Set forth below is a table of activity of warrants for common stock and the related weighted average exercise price per warrant.

Reverse Stock Split - On May 30, 2024, we effected a 1-for-15 reverse stock split of our common stock and reduced the authorized common shares from 100,000,000 to 50,000,000. The par value was not adjusted as a result of the reverse stock split. All issued and outstanding common stock, warrants, stock options, restricted stock units and per share amounts contained in the accompanying consolidated financial statements and notes have been retroactively adjusted to give effect to the reverse stock split for all periods presented.

February 2024 Financing - On February 9, 2024, we entered into a Securities Purchase and Registration Rights Agreement relating to a private placement with certain qualified institutional buyers and institutional accredited investors, which closed on February 13, 2024. Pursuant to the agreement, we sold 134,199 shares of our common stock, and warrants to purchase 67,104 shares of our common stock at an exercise price equal to $6.60 per warrant share, subject to certain adjustments, as provided under the terms of the warrant, which are exercisable at any time before February 13, 2026. The gross proceeds of the Offering were $875,000, with associated issuance costs of $43,000.

September 2024 Financing - On August 29, 2024, we entered into securities purchase agreements (the Purchase Agreements) with certain purchasers, pursuant to which we agreed to issue, and sell and the purchasers, in the aggregate to buy, in a public offering (the Registered Offering) (i) 1,377,990 shares of our common stock, $0.001 par value per share (the Common Stock), and accompanying warrants to purchase up to 1,377,990 shares of Common Stock (the Common Warrants), at an offering price of $3.00 per share of Common Stock and accompanying Common Warrant, and (ii) pre-funded warrants (the Pre-Funded Warrants and together with the Common Warrants the Warrants) to purchase up to 1,022,010 shares of Common Stock and accompanying Common Warrants to purchase up to 1,022,010 shares of Common Stock, at an offering price of $2.999 per Pre-Funded Warrant and accompanying Common Warrant. Certain of the Company’s directors and executive officers purchased an aggregate of 211,000 shares of Common Stock and accompanying Common Warrants. The Registered Offering closed on September 3, 2024, with the Company issuing 2,400,000 shares of Common Stock, including the exercise of the Pre-Funded Warrants, and Common Warrants to purchase 2,400,000 shares of Common Stock. Each Common Warrant is exercisable at a price per share of $3.00 and expires on September 3, 2029. The gross proceeds of the Registered Offering were $7.2 million, with associated issuance costs of $926,00.

April 2025 Financing - On April 22, 2025, we entered into a Securities Purchase and Registration Rights Agreement relating to a private placement with certain qualified institutional buyers and institutional accredited investors, as well as certain members of our board of directors and executive officers which closed on April 23, 2025. Pursuant to the agreement, we sold 406,818 shares of our common stock, and warrants to purchase an aggregate of 406,818 shares of our common stock at an exercise price equal to $1.905 per share, which are exercisable at any time before the earlier of April 24, 2030 or the approval by the Japanese Pharmaceuticals and Medical Devices Agency of our application of our CardiAMP Cell Therapy System. The gross proceeds of the Offering were $775,000, with associated issuance costs of $56,000.

June 2025 Financing - On June 30, 2025, we entered into a Securities Purchase and Registration Rights Agreement relating to a private placement with certain qualified institutional buyers and institutional accredited investors, as well as certain members of our board of directors and executive officers, which closed on June 30, 2025. Pursuant to the agreement, we sold 274,696 shares of our common stock, and warrants to purchase an aggregate of 274,696 shares of our common stock at an exercise price equal to $1.95 per share, which are exercisable at any time before the earlier of June 30, 2030 or the approval by the Japanese Pharmaceuticals and Medical Devices Agency of our application of our CardiAMP Cell Therapy System. The gross proceeds of the Offering were $570,000, with associated issuance costs of $9,000.

At-the-Market (ATM) Offerings – On December 6, 2023, we entered into an “At The Market” offering agreement (the Sales Agreement) with H.C. Wainwright & Co., LLC (HCW). Under the Sales Agreement, we may offer and sell our common stock, from time to time having an aggregate offering amount of up to $2.75 million during the term of the Sales Agreement through or to HCW as sales agent or principal. We have filed a prospectus supplement, the ATM Prospectus Supplement, relating to the offer and sale of the shares pursuant to the Sales Agreement. The offering and sale of the shares will be made pursuant to the Company’s previously filed and effective Registration Statement on Form S-3 (File No. 333-275099), which was initially filed with the Securities and Exchange Commission (the “SEC”) on October 19, 2023 and declared effective on December 5, 2023. We have agreed to pay HCW a commission equal to 3% of the gross proceeds from the sales of shares and have agreed to provide HCW with customary indemnification and contribution rights.

On December 2, 2024, we filed a prospectus supplement to the ATM Prospectus Supplement that updated the maximum aggregate offering amount to approximately $1.3 million. On April 4, 2025, we filed a prospectus supplement that updated the maximum aggregate offering amount that may be sold pursuant to the Sales Agreement to approximately $1.8 million.

As of June 30, 2025, approximately $1.5 million of common stock may still be sold pursuant to the Sales Agreement. Activity under the Sales Agreement was as follows (in thousands except share amounts):