[SCHEDULE 13G/A] SilverBox Corp IV SEC Filing

Rhea-AI Filing Summary

Highbridge Capital Management filed Amendment No. 1 to Schedule 13G reporting beneficial ownership of 280,000 Class A Ordinary Shares of SilverBox Corp IV (SBXD), representing 1.4% of the class.

The percentage is based on 20,455,000 Class A shares outstanding as of August 12, 2025 and assumes conversion of Class B shares held by Highbridge-advised funds. Highbridge reports sole voting power: 280,000 and sole dispositive power: 280,000. The filing certifies the securities were acquired and are held in the ordinary course and not for the purpose of changing or influencing control. Highbridge notes the funds have rights to dividends or sale proceeds on the reported shares.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

SilverBox Corp IV

(Name of Issuer)

Class A Ordinary Shares, par value $0.0001 per share

(Title of Class of Securities)

G81354105

(CUSIP Number)

09/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. G81354105

1

Names of Reporting Persons

HIGHBRIDGE CAPITAL MANAGEMENT LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 280,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 280,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

280,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.4 %

12

Type of Reporting Person (See Instructions)

IA, OO

Comment for Type of Reporting Person: Reflects shares of Class A Ordinary Shares (as defined in Item 2(a)) issuable upon conversion of Class B Ordinary Shares (as defined in Item 2(a)).

SCHEDULE 13G

Item 1.
(a)	Name of issuer: SilverBox Corp IV
(b)	Address of issuer's principal executive offices: 1250 S. Capital of Texas Highway, Building 2, Suite 285, Austin, TX 78746.
Item 2.
(a)	Name of person filing: This statement is filed by Highbridge Capital Management, LLC ("Highbridge" or the "Reporting Person"), a Delaware limited liability company and the investment adviser to certain funds and accounts (the "Highbridge Funds"), with respect to the class A ordinary shares, par value $0.0001 per share ("Class A Ordinary Shares"), of SilverBox Corp IV, a Cayman Islands exempted company (the "Issuer") issuable upon conversion of the Class B ordinary shares, par value $0.0001 per share (the "Class B Ordinary Shares"), directly held by the Highbridge Funds. The filing of this statement should not be construed as an admission that any of the foregoing persons or the Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, the beneficial owner of the securities reported herein.
(b)	Address or principal business office or, if none, residence: The address of the business office of the Reporting Person is 277 Park Avenue, 23rd Floor, New York, New York 10172.
(c)	Citizenship: Highbridge is a Delaware limited liability company.
(d)	Title of class of securities: Class A Ordinary Shares, par value $0.0001 per share
(e)	CUSIP No.: G81354105
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: The information required by Item 4(a) is set forth in Row 9 of the cover page for the Reporting Person and is incorporated herein by reference. The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 20,455,000 Class A Ordinary Shares outstanding as of August 12, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2025, filed with the Securities and Exchange Commission on August 12, 2025, and assumes the conversion of the Class B Ordinary Shares held by the Highbridge Funds.
(b)	Percent of class: 1.4%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for the Reporting Person and is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for the Reporting Person and is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for the Reporting Person and is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for the Reporting Person and is incorporated herein by reference.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. See Item 2(a). The Highbridge Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Class A Ordinary Shares reported herein.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

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

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

HIGHBRIDGE CAPITAL MANAGEMENT LLC

Signature:	/s/ Kirk Rule
Name/Title:	Kirk Rule, Executive Director
Date:	11/14/2025

FAQ

What did Highbridge report in its Schedule 13G/A for SBXD?

Highbridge reported beneficial ownership of 280,000 Class A Ordinary Shares of SilverBox Corp IV, equal to 1.4% of the class.

How was the 1.4% stake in SBXD calculated?

The percentage is based on 20,455,000 Class A shares outstanding as of August 12, 2025 and assumes conversion of Class B shares held by Highbridge funds.

What voting and dispositive powers did Highbridge report for SBXD?

Highbridge reported sole voting power: 280,000 and sole dispositive power: 280,000; no shared powers were reported.

Were the SBXD securities acquired to influence control?

No. The certification states they were acquired and are held in the ordinary course and not to change or influence control.

Who has rights to dividends or sale proceeds on the SBXD shares?

The Highbridge Funds have the right to receive dividends or sale proceeds on the reported Class A shares.

What is the class and CUSIP of the SBXD securities reported?

The securities are Class A Ordinary Shares with CUSIP G81354105.

What was the date of the event requiring the filing?

The reported event date was September 30, 2025.