Beneficial Ownership Report · SCHEDULE 13G/A
SILVERBOX CORP IV
SBXDFOTCEQUITYCurrent
Beneficial Ownership Report
Structured filing — SCHEDULE 13G/A
primary_doc.xml
Amendment · This filing reports the amendment as submitted.
Subject company
- Company
- SILVERBOX CORP IV
- Company CIK
- 0002015947
- Street
- 8701 Bee Cave Road
- Street (continued)
- East Building, Suite 310
- City
- Austin
- State / country code
- TX
- Postal code
- 78746
Statement details
- Amendment number
- 3
- Security class
- Class A ordinary shares, par value $0.0001 per share
- Event date
- 09/30/2026
- Rule designation
- Rule 13d-1(b)
Reporting person 1
- Name
- W. R. Berkley Corporation
- Citizenship / organization
- DE
- Reporting person type
- CO
- Aggregate amount owned
- 0.00
- Percent of class
- 0.0
- Sole voting power
- 0.00
- Shared voting power
- 0.00
- Sole dispositive power
- 0.00
- Shared dispositive power
- 0.00
- Aggregate excludes certain shares
- N
Reporting person 2
- Name
- Berkley Insurance Company
- Citizenship / organization
- DE
- Reporting person type
- CO · IC
- Aggregate amount owned
- 0.00
- Percent of class
- 0.0
- Sole voting power
- 0.00
- Shared voting power
- 0.00
- Sole dispositive power
- 0.00
- Shared dispositive power
- 0.00
- Aggregate excludes certain shares
- N
Item 1
Issuer
SILVERBOX CORP IV
Principal executive office address
8701 Bee Cave Road, East Building, Suite 310, Austin, Texas, 78746
Item 2
Citizenship
US
Filing person
W. R. Berkley Corporation
Principal business or residence address
475 Steamboat Road Greenwich, CT 06830
Item 3
Not applicable indication
N
Type of filing person
IC · HC
Item 4
Percent of class
0
Amount beneficially owned
0
Sole voting power
0
Shared voting power
0
Sole dispositive power
0
Shared dispositive power
0
Item 5
Not applicable indication
N
Ownership of 5% or less
Y
Item 6
Not applicable indication
Y
Item 7
Not applicable indication
N
Subsidiaries
See Exhibit 99.1
Item 8
Not applicable indication
Y
Item 9
Not applicable indication
Y
Item 10
Not applicable indication
N
Certifications
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
Signature 1
- Reporting person
- W. R. Berkley Corporation
- Signed
- /s/ Richard M. Baio
- Title
- Richard M. Baio/Executive Vice President and Chief Financial Officer
- Date
- 11/09/2026
Signature 2
- Reporting person
- Berkley Insurance Company
- Signed
- /s/ Richard M. Baio
- Title
- Richard M. Baio/Executive Vice President and Treasurer
- Date
- 11/06/2026
Filed exhibits
Company context
SilverBox Corp IV is a special purpose acquisition company (“SPAC”) sponsored by an affiliate of SilverBox Capital and formed as part of an institutional platform to sponsor a series of SPACs. SBXD completed its $200 million initial public offering in August 2024 and its stock currently trades on NYSE under the ticker “SBXD.” SilverBox Capital is a strategic investment and advisory firm that brings together capital, advice and operating expertise in a single, aligned platform. Learn more at www.sbcap.com.
Current securities
Recent company filings
- SCHEDULE 13G/A - filed by BARCLAYS PLC regarding SilverBox Corp IVNov 6, 2026
- 25-NSE - filed by NEW YORK STOCK EXCHANGE LLC regarding SilverBox Corp IVOct 13, 2026
- SCHEDULE 13G - filed by CALAMOS INVESTMENT TRUST/IL regarding SilverBox Corp IVOct 9, 2026
- Other EventsSep 28, 2026
- Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of ListingSep 25, 2026