SCHEDULE 13G 0002033223 XXXXXXXX LIVE Class A Ordinary Shares 12/31/2024 0002015947 SilverBox Corp IV G81354105 1250 S. Capital of Texas Highway Building 2, Suite 285 Austin TX 78746 Rule 13d-1(d) SilverBox Sponsor IV LLC DE 0.00 5455000.00 0.00 5455000.00 5455000.00 N 21.4 OO (1) See Item 4. The Reporting Person owns (i) 5,000,000 Class B ordinary shares of the Issuer, which are automatically convertible into Class A ordinary shares of the Issuer, as more fully described under the heading "Description of Securities - Founder Shares" in the Issuer's registration statement on Form S-1 (File No. 333-280315) and (ii) 455,000 Class A ordinary shares of the Issuer included in units of the Issuer purchased in a private placement that closed concurrently with the Issuer's initial public offering. SilverBox Sponsor IV LLC is the record holder of the shares reported herein. Mr. Kadenacy and Mr. Reece are each the co-managing member of Boxwood Holdings III LLC, the managing member of SilverBox Sponsor IV LLC. AS such, they may be deemed to have or share beneficial ownership of the ordinary shares held directly by SilverBox Sponsor IV LLC. Mr. Reece and Mr. Kadenacy disclaim any beneficial ownership of the reported shares other than to the extent of any pecuniary interest they may have therein, directly or indirectly. (2) Excludes 151,666 Class A ordinary shares which may be purchased by exercising warrants that are not presently exercisable. Boxwood Holdings III LLC DE 0.00 5455000.00 0.00 5455000.00 5455000.00 N 21.4 IN (1) See Item 4. The Reporting Person owns (i) 5,000,000 Class B ordinary shares of the Issuer, which are automatically convertible into Class A ordinary shares of the Issuer, as more fully described under the heading "Description of Securities - Founder Shares" in the Issuer's registration statement on Form S-1 (File No. 333-280315) and (ii) 455,000 Class A ordinary shares of the Issuer included in units of the Issuer purchased in a private placement that closed concurrently with the Issuer's initial public offering. SilverBox Sponsor IV LLC is the record holder of the shares reported herein. Mr. Kadenacy and Mr. Reece are each the co-managing member of Boxwood Holdings III LLC, the managing member of SilverBox Sponsor IV LLC. AS such, they may be deemed to have or share beneficial ownership of the ordinary shares held directly by SilverBox Sponsor IV LLC. Mr. Reece and Mr. Kadenacy disclaim any beneficial ownership of the reported shares other than to the extent of any pecuniary interest they may have therein, directly or indirectly. (2) Excludes 151,666 Class A ordinary shares which may be purchased by exercising warrants that are not presently exercisable. Stephen K. Kadenacy DE 0.00 5455000.00 0.00 5455000.00 5455000.00 N 21.4 IN (1) See Item 4. The Reporting Person owns (i) 5,000,000 Class B ordinary shares of the Issuer, which are automatically convertible into Class A ordinary shares of the Issuer, as more fully described under the heading "Description of Securities - Founder Shares" in the Issuer's registration statement on Form S-1 (File No. 333-280315) and (ii) 455,000 Class A ordinary shares of the Issuer included in units of the Issuer purchased in a private placement that closed concurrently with the Issuer's initial public offering. SilverBox Sponsor IV LLC is the record holder of the shares reported herein. Mr. Kadenacy and Mr. Reece are each the co-managing member of Boxwood Holdings III LLC, the managing member of SilverBox Sponsor IV LLC. AS such, they may be deemed to have or share beneficial ownership of the ordinary shares held directly by SilverBox Sponsor IV LLC. Mr. Reece and Mr. Kadenacy disclaim any beneficial ownership of the reported shares other than to the extent of any pecuniary interest they may have therein, directly or indirectly. (2) Excludes 151,666 Class A ordinary shares which may be purchased by exercising warrants that are not presently exercisable. Joseph E. Reece DE 0.00 5455000.00 0.00 5455000.00 5455000.00 N 21.4 IN (1) See Item 4. The Reporting Person owns (i) 5,000,000 Class B ordinary shares of the Issuer, which are automatically convertible into Class A ordinary shares of the Issuer, as more fully described under the heading "Description of Securities - Founder Shares" in the Issuer's registration statement on Form S-1 (File No. 333-280315) and (ii) 455,000 Class A ordinary shares of the Issuer included in units of the Issuer purchased in a private placement that closed concurrently with the Issuer's initial public offering. SilverBox Sponsor IV LLC is the record holder of the shares reported herein. Mr. Kadenacy and Mr. Reece are each the co-managing member of Boxwood Holdings III LLC, the managing member of SilverBox Sponsor IV LLC. As such, they may be deemed to have or share beneficial ownership of the ordinary shares held directly by SilverBox Sponsor IV LLC. Mr. Reece and Mr. Kadenacy disclaim any beneficial ownership of the reported shares other than to the extent of any pecuniary interest they may have therein, directly or indirectly. (2) Excludes 151,666 Class A ordinary shares which may be purchased by exercising warrants that are not presently exercisable. SilverBox Corp IV 1250 S. Capital of Texas Highway Building 2, Suite 285 Austin, TX, 78746 This Schedule 13G is being filed by SilverBox Sponsor IV LLC, Stephen K. Kadenacy and Joseph E. Reece (collectively, the "Reporting Persons.") 1250 S. Capital of Texas Highway, Building 2, Suite 285, Austin, TX 78746 SilverBox Sponsor IV LLC is a limited liability company formed in Delaware. Each of Stephen K. Kadenacy and Joseph E. Reece is a citizen of the United States of America. Y The responses to Items 5-11 of the cover page of this Schedule 13G are incorporated herein by reference. As of December 31, 2024, the Reporting Persons may be deemed to beneficially own 5,455,000 of the Issuer's Class A ordinary shares. This represents 21.4% of the total Class A ordinary shares issued and outstanding and assuming the conversion of all the issued and outstanding Class B ordinary shares of the Issuer. The Class B ordinary shares are automatically convertible into Class A ordinary shares of the Issuer, as more fully described under the heading "Description of Securities - Founder Shares" in the Issuer's registration statement on Form S-1 (File No. 333-280315). The percentages used in this Schedule 13G are based on 20,455,000 of the Issuer's Class A ordinary shares and 5,000,000 of the Issuer's Class B ordinary shares issued and outstanding as of November 11, 2024, as reported in the Issuer's Quarterly Report on Form 10-Q for the three months ended September 30, 2024, filed with the Securities and Exchange Commission on November 12, 2024. None SilverBox Sponsor IV LLC is the record holder of the 5,455,000 shares reported herein. Mr. Kadenacy and Mr. Reece are each the co-managing member of Boxwood Holdings III LLC, the managing member of SilverBox Sponsor IV LLC. As such, they may be deemed to have or share beneficial ownership of the ordinary shares held directly by SilverBox Sponsor IV LLC. Mr. Reece and Mr. Kadenacy disclaim any beneficial ownership of the reported shares other than to the extent of any pecuniary interest they may have therein, directly or indirectly. None SilverBox Sponsor IV LLC is the record holder of the 5,455,000 shares reported herein. Mr. Kadenacy and Mr. Reece are each the co-managing member of Boxwood Holdings III LLC, the managing member of SilverBox Sponsor IV LLC. As such, they may be deemed to have or share beneficial ownership of the ordinary shares held directly by SilverBox Sponsor IV LLC. Mr. Reece and Mr. Kadenacy disclaim any beneficial ownership of the reported shares other than to the extent of any pecuniary interest they may have therein, directly or indirectly. Y Y Y Y Y Y SilverBox Sponsor IV LLC /s/ Stephen K. Kadenacy 02/13/2025 /s/ Joseph E. Reece 02/13/2025 Boxwood Holdings III LLC /s/ Stephen K. Kadenacy 02/13/2025 Joseph E. Reece 02/13/2025 Stephen K. Kadenacy /s/ Stephen K. Kadenacy 02/13/2025 Joseph E. Reece /s/ Joseph E. Reece 02/13/2025