Compass Therapeutics Inc. Watch

from S-3 38 pages Compass Therapeutics, Inc. Issuer and [Trustee], Trustee Indenture Dated as of [•], 20 Debt Securities

from S-3 38 pages Compass Therapeutics, Inc. Issuer and [Trustee], Trustee Indenture Dated as of [•], 20 Debt Securities

from 10-K 4 pages Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934, as Amended

from S-1 1 page Number Compass Therapeutics, Inc. Incorporated Under the Laws of the State of Delaware Shares See Reverse Side for Certain Definitions This Certifies That Is the Owner of Fully Paid and Non-Assessable Common Shares, $0.0001 Par Value, of Compass Therapeutics, Inc. Transferable on the Books of the Corporation by the Holder Hereof in Person or by Attorney Upon Surrender of This Certificate Properly Endorsed. This Certificate Is Not Valid Until Countersigned and Registered by the Transfer Agent and Registrar. in Witness Whereof, the Said Corporation Has Caused This Certificate to Be Signed by Facsimile Signatures of Its Duly Authorized Officers. Dated: Chief Executive Officer Compass Therapeutics, Inc. Corporate Seal March 20, 2018 Chief Operating Officer Countersigned and Registered: American Stock Transfer & Trust Company by (Brooklyn, New York) Transfer Agent and Registrar Authorized Signature

from 10-12G 4 pages Promissory Note