from 10-K 3 pages The Corporation Shall Furnish Without Charge to Each Stockholder Who So Requests a Statement of the Powers, Designations, Preferences and Relative, Participating, Optional or Other Special Rights of Each Class of Stock of the Corporation or Series Thereof and the Qualifications, Limitations or Restrictions of Such Preferences and/or Rights. Such Requests Shall Be Made to the Corporation’s Secretary at the Principal Office of the Corporation. Keep This Certificate in a Safe Place. if It Is Lost, Stolen or Destroyed, the Corporation Will Require a Bond of Indemnity as a Condition to the Issuance of a Replacement Certificate. the Following Abbreviations, When Used in the Inscription on the Face of This Certificate, Shall Be Construed as Though They Were Written Out in Full According to Applicable Laws or Regulations: Ten Com – As Tenants in Common Unif Gift Min Act – Custodian Ten Ent – As Tenants by the Entireties (Cust) (Minor) Jt Ten – As Joint Tenants With Right of Survivorship and Not as Tenants in Common Under Uniform Gifts to Minors Com Prop – As Community Property Act

from 10-K 7 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

from 10-K 24 pages Climb Bio, Inc. 2021 Equity Incentive Plan Adopted by the Compensation Committee of the Board of Directors: July 26, 2021 Approved by the Stockholders: July 29, 2021

from 10-K 12 pages Climb Bio, Inc. Stock Option Grant Notice

from 10-K 13 pages Climb Bio, Inc. Rsu Award Grant Notice

from 10-K 12 pages Climb Bio, Inc. 2021 Employee Stock Purchase Plan Adopted by the Compensation Committee of the Board of Directors: July 26, 2021 Approved by the Stockholders: July 29, 2021

from 10-K 91 pages Certain Identified Information Has Been Excluded From the Exhibit Because It Is Both (I) Not Material and (II) Is the Type of Information That the Registrant Treats as Private or Confidential. Double Asterisks Denote Omissions. Technology Transfer and Exclusive License Agreement by and Between Beijing Mabworks Biotech Co., Ltd. and Climb Bio, Inc

from 10-K 8 pages Report furnished to security holders

from 10-K 2 pages Subsidiaries of the registrant

from 10-K 2 pages Consent of expert or counsel

from 10-K 2 pages Management certification of annual or quarterly disclosure

from 10-K 2 pages Management certification of annual or quarterly disclosure

from 10-K 2 pages Management certification of financial report

from 10-K 2 pages Management certification of financial report

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