WISeSat.Space Holdings Corp, a wholly-owned subsidiary of WISeSat.Space Corp., has filed a registration statement on Form F-4 with the U.S. Securities and Exchange Commission (SEC) regarding its proposed business combination with Columbus Acquisition Corp. The filing, submitted on May 29, 2026, outlines the transaction that will result in the combined entity trading on Nasdaq under the ticker symbol SIOQ. The registration statement has not yet been declared effective by the SEC.

The business combination is governed by a definitive Business Combination Agreement dated November 9, 2025, involving WISeSat, Columbus Acquisition Corp, WISeSat.Space Holdings Corp (Pubco), WISeKey International Holding Ltd, and WISeSat Merger Sub Corp. Upon completion of the transaction, WISeSat and Columbus Acquisition Corp will become subsidiaries of Pubco. The combined company plans to operate under the brand SPACEAIQ, reflecting a focus on Space Infrastructure, Artificial Intelligence, and Quantum Technologies, while the WISeSat brand will continue to serve the satellite business.

WISeSat is developing secure satellite infrastructure and space-based services to support trusted communications and digital identity. The company aims to provide persistent, secure connectivity for government communications, industrial IoT, and critical infrastructure monitoring by combining low-earth-orbit satellite assets with cryptographic technologies. As part of the WISeKey group, WISeSat intends to extend Root of Trust and quantum-resilient security architectures into space.

Carlos Moreira, Chief Executive Officer of WISeSat, stated that the filing marks an important milestone in the company's path to becoming a Nasdaq-listed space infrastructure company. He emphasized that the transaction reflects progress toward creating a European, quantum-secure satellite platform for sovereign and trusted connectivity. The completion of the proposed transaction remains subject to closing conditions, including the approval of Columbus Acquisition Corp shareholders, the effectiveness of the registration statement, and approval of the listing of Pubco's shares by Nasdaq.

Maxim Group LLC is acting as the exclusive financial advisor to WISeKey, while Ellenoff Grossman & Schole LLP is serving as legal advisor to WISeSat and Pubco. Loeb & Loeb LLP is acting as legal advisor to Columbus Acquisition Corp. Investors and interested parties may access the registration statement and related documents through the SEC's website at www.sec.gov or via WISeKey's website at https://www.wisekey.com/ .