WISeKey and Its Subsidiary WISeSat.Space Corp. Announce Confidential Submission of Amended Draft Registration Statement on Form F-4 with the U.S. Securities and Exchange Commission Canton of Zug, Switzerland— June 4, 2026 — WISeKey International Holding Ltd. ("WISeKey") ((SIX: WIHN, NASDAQ:WKEY), a global leader in cybersecurity, digital identity and IoT, and its subsidiary WISeSat.Space Corp. ("WISeSat") today announced the confidential submission of an amended draft registration statement on Form F-4 with the U.S. Securities and Exchange Commission ("SEC") on May 29, 2026 by WISeSat.Space Holdings Corp. ("Pubco"), a wholly-owned subsidiary of WISeSat. The draft registration statement

WISeKey Reports Audited Full Year 2025 Financial Results Schedules Conference Call for Monday, May 4 at 9:00am EDT Audited FY 2025 revenue of $19.3 million, representing 62% growth year-over-yearSubsidiary SEALSQ reported 66% year-over-year revenue growth Reaffirms FY 2026 guidance with revenue expected to grow between 50%-100% year-over-year; Q1 2026 unaudited revenue of $4.2 millionStrong cash and short-term investments of over $535 million as of April 30, 2026, well positions the WISeKey Group to execute growth strategyCommercial pipeline exceeding $200 million for 2026–2029 for SEALSQ alone, including over $60 million linked to QS7001 and QVault TPM programs Geneva, Switzerland - Apri

WISeKey's WISeSat Schedules Launch of Its 21st LEO Satellite with SpaceX from California for March 2026 WISeSat Teams with SEALSQ and SEALCOIN.AI for an Exceptional Opportunity to Accelerate Its Vision for the Space Quantum Internet, Delivering Quantum-Secure, High-Speed, Low-Latency Broadband Directly to Users via a Constellation of LEO Satellites Geneva, Switzerland, February 11, 2026 – WISeKey International Holding Ltd ("WISeKey") ((SIX: WIHN, NASDAQ:WKEY), a leading global cybersecurity, blockchain, and IoT company, today announces that its subsidiary WISeSat.Space Corp. ("WISeSat") specialized in space-technology and secure satellite communications for IoT applications is preparing

WISeKey Appoints Gwenael Rouy-Poirier as Chief Financial Officer of WISeSat, its Satellite Connectivity Subsidiary Geneva, Switzerland, February 10, 2026 – WISeKey International Holding Ltd ("WISeKey" or the "Company") ((SIX: WIHN, NASDAQ:WKEY), a global leader in cybersecurity, digital identity and Internet of Things (IoT) solutions, today announced the appointment of Gwenael Rouy-Poirier as Chief Financial Officer of its subsidiary WISeSat.Space Corp. ("WISeSat") specialized in space-technology and secure satellite communications for IoT applications, effective February 2, 2026. Of note, in November 2025, WISeSat announced a Business Combination Agreement with Columbus Acquisition Corp.

Canton of Zug, Switzerland and Singapore – December 29, 2025 - WISeKey International Holding AG (NASDAQ:WKEY) ("WISeKey") , a global leader in cybersecurity, digital identity, and IoT solutions platform, and Columbus Acquisition Corp. (NASDAQ:COLA) ("Columbus"), a publicly traded special purpose acquisition company, today announced the confidential submission of a draft registration statement on Form F-4 (the "Confidential Registration Statement") with the U.S. Securities and Exchange Commission ("SEC") on December 23, 2025. The Confidential Registration Statement relates to the business combination previously announced on November 10, 2025 (the "business combination"), pursuant to the Busin

WISeKey to receive $250 million in equity of WISeSat.Space Holdings Corp.Transaction anticipated to close in the first half of 2026 Canton of Zug, Switzerland and Singapore, Nov. 10, 2025 (GLOBE NEWSWIRE) -- WISeKey International Holding AG ("WISeKey") (NASDAQ:WKEY, SIX: WIHN)), a global leader in cybersecurity, digital identity, and IoT solutions platform, and Columbus Acquisition Corp. ("Columbus") (NASDAQ:COLA), a Cayman Islands publicly traded special purpose acquisition company (SPAC), today announced that they have entered into a definitive Business Combination Agreement, dated as of November 9, 2025 (the "Business Combination Agreement"), for a business combination of Columbus and

WISeKey International Holding AG (NASDAQ:WKEY) and Columbus Acquisition Corp. (NASDAQ:COLA) Execute Definitive Business Combination Agreement to Publicly List WISeKey's Subsidiary WISeSat.Space Corp. Under The Name WISeSat.Space Holdings Corp. WISeKey to receive $250 million in equity of WISeSat.Space Holdings Corp.Transaction anticipated to close in the first half of 2026 Canton of Zug, Switzerland and Singapore, November 10, 2025 -- Ad-Hoc announcement pursuant to Art. 53 of SIX Listing Rules – WISeKey International Holding AG ("WISeKey") (NASDAQ:WKEY, SIX: WIHN)), a global leader in cybersecurity, digital identity, and IoT solutions platform, and Columbus Acquisition Corp. ("Columbus")

425 - Columbus Acquisition Corp/Cayman Islands (0002028201) (Subject)

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8-K - Columbus Acquisition Corp/Cayman Islands (0002028201) (Filer)

425 - Columbus Acquisition Corp/Cayman Islands (0002028201) (Subject)

8-K - Columbus Acquisition Corp/Cayman Islands (0002028201) (Filer)

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10-Q - Columbus Acquisition Corp/Cayman Islands (0002028201) (Filer)

SCHEDULE 13G/A - Columbus Acquisition Corp/Cayman Islands (0002028201) (Subject)

SCHEDULE 13G/A - Columbus Acquisition Corp/Cayman Islands (0002028201) (Subject)

425 - Columbus Acquisition Corp/Cayman Islands (0002028201) (Subject)

3 - Columbus Acquisition Corp/Cayman Islands (0002028201) (Issuer)

WISeKey Reports Audited Full Year 2025 Financial Results Schedules Conference Call for Monday, May 4 at 9:00am EDT Audited FY 2025 revenue of $19.3 million, representing 62% growth year-over-yearSubsidiary SEALSQ reported 66% year-over-year revenue growth Reaffirms FY 2026 guidance with revenue expected to grow between 50%-100% year-over-year; Q1 2026 unaudited revenue of $4.2 millionStrong cash and short-term investments of over $535 million as of April 30, 2026, well positions the WISeKey Group to execute growth strategyCommercial pipeline exceeding $200 million for 2026–2029 for SEALSQ alone, including over $60 million linked to QS7001 and QVault TPM programs Geneva, Switzerland - Apri

WISeKey Appoints Gwenael Rouy-Poirier as Chief Financial Officer of WISeSat, its Satellite Connectivity Subsidiary Geneva, Switzerland, February 10, 2026 – WISeKey International Holding Ltd ("WISeKey" or the "Company") ((SIX: WIHN, NASDAQ:WKEY), a global leader in cybersecurity, digital identity and Internet of Things (IoT) solutions, today announced the appointment of Gwenael Rouy-Poirier as Chief Financial Officer of its subsidiary WISeSat.Space Corp. ("WISeSat") specialized in space-technology and secure satellite communications for IoT applications, effective February 2, 2026. Of note, in November 2025, WISeSat announced a Business Combination Agreement with Columbus Acquisition Corp.