GigCapital8 Corp., a special purpose acquisition company (SPAC), announced on October 8, 2026, that it has entered into a definitive Agreement and Plan of Merger with Quantisimo Corp. The transaction, valued at approximately $666.1 million, will result in the formation of a new publicly traded holding company, Quantisimo Holding Corp., which will be listed on the Nasdaq Capital Market under the symbol "QSMO." The deal is expected to close in the first quarter of 2027.
Quantisimo is being established as a pure-play sovereign quantum vertical platform, described as having a "Root to Qubit" vision. The company is being formed by WISeQey Corp., a global quantum cybersecurity and space IoT company, and its subsidiary, SEALSQ Corp., a developer of secure semiconductors and post-quantum security products. Upon closing, WISeQey and SEALSQ will contribute their interests in operating businesses, including Miraex SA, SEALCOIN AG, WeCan Group SA, and WISeSat.Space Holdings Corp., to Quantisimo.
Under the terms of the agreement, each share of GigCapital8 Class A ordinary share will be exchanged for one share of the new public company, and each five rights will convert into one share. The shareholders of Quantisimo will receive an aggregate of 66,610,000 shares of the new holding company. WISeQey and SEALSQ are expected to hold a majority of the outstanding ordinary shares of Quantisimo Holding Corp. The transaction is supported by a minimum cash condition of $15 million, to be funded through GigCapital8’s trust account, any PIPE investment, and a matching cash contribution from SEALSQ.
GigCapital8’s sponsor has agreed to vote in favor of the transaction and not to redeem shares. Additionally, WISeQey, SEALSQ, and the sponsor have agreed to customary six-month lock-up agreements. The boards of directors of GigCapital8, Quantisimo, WISeQey, SEALSQ, and the new holding company have all approved the transaction and recommended shareholder approval.
