Amendment No. 5 to Schedule 13D for Climb Bio, Inc.

This Amendment No. 5 to Schedule 13D is filed by AI ETI LLC, Access Industries Holdings LLC, Access Industries Management, LLC, and Len Blavatnik (collectively, the "Reporting Persons") in respect of common stock of Climb Bio, Inc. The amendment updates the Schedule 13D originally filed on August 23, 2021, and subsequently amended. The key changes include the sale of shares by AI ETI LLC on October 14 and 16, 2025. On October 14, 2025, AI ETI sold 750,000 shares at $1.9202 per share. On October 16, 2025, AI ETI sold 1,000,000 shares and 2,085,117 shares at $1.95 per share in separate block trades. As of October 14, 2025, each of the Reporting Persons ceased to be the beneficial owner of more than five percent of the Issuer's shares of Common Stock. The amendment is filed in accordance with Rule 13d-2 of the Securities Exchange Act of 1934.