SilverBox Corp IV

PubCo and the Company have filed a Registration Statement on S-4 (333-289994) (as amended or supplemented from time to time, the “Registration Statement”) with the Securities and Exchange Commission (“SEC”), which includes a preliminary proxy statement of SBXD and a prospectus of PubCo (the “Proxy Statement/Prospectus”) in connection with the Transactions (as defined below). The definitive proxy statement and other relevant documents will be mailed to shareholders of SBXD as of a record date to be established for voting on the Transactions and other matters as described in the Proxy Statement/Prospectus. SBXD, the Company and/or PubCo will also file other documents regarding the Transactions with the SEC. This Current Report on Form 8-K does not contain all of the information that should be considered concerning the Transactions and is not intended to form the basis of any investment decision or any other decision in respect of the Transactions. BEFORE MAKING ANY VOTING OR INVESTMENT DECISION, SHAREHOLDERS OF SBXD AND OTHER INTERESTED PARTIES ARE URGED TO READ, WHEN AVAILABLE, THE PRELIMINARY PROXY STATEMENT/PROSPECTUS, AND AMENDMENTS THERETO, AND THE DEFINITIVE PROXY STATEMENT/PROSPECTUS AND ALL OTHER RELEVANT DOCUMENTS FILED OR THAT WILL BE FILED WITH THE SEC IN CONNECTION WITH SBXD’S SOLICITATION OF PROXIES FOR THE EXTRAORDINARY GENERAL MEETING OF ITS SHAREHOLDERS TO BE HELD TO APPROVE THE TRANSACTIONS AND OTHER MATTERS AS DESCRIBED IN THE PROXY STATEMENT/PROSPECTUS BECAUSE THESE DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION ABOUT SBXD, THE COMPANY, PUBCO AND THE TRANSACTIONS. Investors and security holders will also be able to obtain copies of the Registration Statement and the Proxy Statement/Prospectus and all other documents filed or that will be filed with the SEC by SBXD and PubCo, without charge, once available, on the SEC’s website at www.sec.gov or by directing a request to: SilverBox Corp IV, 8701 Bee Cave Road, East Building, Suite 310, Austin, TX 78746, or upon written request to PubCo, via email at info@sbcap.com.

NEITHER THE SEC NOR ANY STATE SECURITIES REGULATORY AGENCY HAS APPROVED OR DISAPPROVED THE TRANSACTIONS DESCRIBED HEREIN, PASSED UPON THE MERITS OR FAIRNESS OF THE TRANSACTIONS OR ANY RELATED TRANSACTIONS OR PASSED UPON THE ADEQUACY OR ACCURACY OF THE DISCLOSURE IN THIS COMMUNICATION. ANY REPRESENTATION TO THE CONTRARY CONSTITUTES A CRIMINAL OFFENSE.