0001213900-26-091234 Sample Contracts
FORM OF SELLER JOINDER AGREEMENTSeller Joinder Agreement • August 18th, 2026 • SEALSQ Corp • Semiconductors & related devices
THIS SELLER JOINDER AGREEMENT (this “Joinder Agreement”) is made and entered into as of December 12, 2025, by the undersigned shareholder (“Joining Seller”) of WISeSat.Space Corp., a British Virgin Islands business company (the “Company”), and accepted by each of the Company, Columbus Acquisition Corp., a Cayman Islands exempted company (together with its successors, “CAC”), WISeSat.Space Holdings Corp., a Cayman Islands exempted company (“Pubco”), and WISeKey International Holding Ltd., a Swiss company (together with its successors and permitted assigns, the “Signing Seller” and, together with the Joining Seller, the “Seller”). Reference is hereby made to that certain Business Combination Agreement, dated as of November 9, 2025 (as it may be amended, modified or supplemented from time to time in accordance with the terms thereof, including by this Joinder Agreement, the “BCA”), by and among (i) the Company, (ii) CAC, (iii) Pubco, (iv) WISeSat Merger Sub Corp., a Cayman Islands exempte
SUBSCRIPTION AGREEMENT August 6, 2026Subscription Agreement • August 18th, 2026 • SEALSQ Corp • Semiconductors & related devices
In connection with the proposed business combination among Columbus Acquisition Corp., a Cayman Islands exempted company (together with its successors, “CAC”), WISeSat.Space Corp., a British Virgin Islands business company d/b/a SpaceAIQ (the “Company”), and WISeSat.Space Holdings Corp., a British Virgin Islands business company (“Pubco”), pursuant to and in accordance with that certain Business Combination Agreement, dated as of November 9, 2025 (as amended, restated and/or supplemented from time to time in accordance with its terms, the “BCA”), by and among CAC, Pubco, WISeSat Merger Sub Corp., a Cayman Islands exempted company and a wholly owned subsidiary of Pubco (“Merger Sub”), the Company and WISeKey International Holding Ltd., a Swiss company (together with its successors, the “WISeKey”), and to which SEALSQ Corp, a British Virgin Islands business company and an affiliate of WISeKey (“SEALSQ”, and together with WISeKey, the “Sellers”) became a party thereto as a Seller thereund
FIRST AMENDMENT TO THE BUSINESS COMBINATION AGREEMENTBusiness Combination Agreement • August 18th, 2026 • SEALSQ Corp • Semiconductors & related devices
This First Amendment (this “First Amendment”) to the Business Combination Agreement, dated as of August 6, 2026, amends the Business Combination Agreement, dated as of November 9, 2025 (the “Original Agreement”, as amended pursuant to this First Amendment and as may be further amended, supplemented, modified and/or restated from time to time, the “Business Combination Agreement”), by and among (i) Columbus Acquisition Corp., a Cayman Islands exempted company (together with its successors, “CAC”), (ii) WISeSat.Space Holdings Corp., a British Virgin Islands business company (“Pubco”), (iii) WISeSat Merger Sub Corp., a Cayman Islands exempted company and a wholly owned subsidiary of Pubco (“Merger Sub”), (iv) WISeSat.Space Corp., a British Virgin Islands business company (the “Company”), (v) WISeKey International Holding Ltd., a Swiss company (together with its successors, including after its anticipated domestication to the British Virgin Islands prior to the Closing, “WISeKey”) and (vi)
BUSINESS COMBINATION AGREEMENTBusiness Combination Agreement • August 18th, 2026 • SEALSQ Corp • Semiconductors & related devices • New York
This Business Combination Agreement (this “Agreement”) is made and entered into as of November 9, 2025 (the “Signing Date”) by and among (i) Columbus Acquisition Corp., a Cayman Islands exempted company (together with its successors, “CAC”), (ii) WISeSat.Space Holdings Corp., a British Virgin Islands business company (“Pubco”), (iii) WISeSat Merger Sub Corp., a Cayman Islands exempted company and a wholly owned subsidiary of Pubco (“Merger Sub”), (iv) WISeSat.Space Corp., a British Virgin Islands business company (the “Company”), and (v) WISeKey International Holding Ltd., a Swiss company (together with its successors, including after its anticipated domestication to the British Virgin Islands prior to the Closing, the “Seller”). CAC, Pubco, Merger Sub, the Company and the Seller are sometimes referred to herein individually as a “Party” and, collectively, as the “Parties”.