[SCHEDULE 13G] SilverBox Corp IV SEC Filing

Rhea-AI Filing Summary

Highbridge Capital Management, LLC filed a Schedule 13G reporting ownership of 1,228,800 Class A Ordinary Shares of SilverBox Corp IV (CUSIP G81354105), representing 5.9% of the Class A shares outstanding based on 20,455,000 shares as of May 13, 2025. The reported amount includes 280,000 Class A shares issuable upon conversion of Class B ordinary shares held by Highbridge Funds. The filing states the securities are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer.

The report cites Highbridge's address in New York and identifies it as a Delaware investment adviser filing on behalf of the Highbridge Funds.

Positive

• Reported ownership of 1,228,800 Class A shares, providing transparency on a significant 5.9% position
• Includes 280,000 shares issuable upon conversion, clarifying the composition of the reported stake
• Filed on Schedule 13G, indicating the Reporting Person asserts passive intent and no plan to influence control

Negative

• None.

Insights

Financial Analyst

TL;DR: Highbridge discloses a meaningful 5.9% stake (1.23M shares), including convertible exposure, but affirms no intent to influence control.

Holding 5.9% of an issuer can be material for market attention and potential activism, particularly when convertible positions are included (280,000 shares issuable on conversion). The filing follows Schedule 13G format, indicating a passive intent rather than an active 13D-level engagement. For investors, the key numeric facts are ownership of 1,228,800 shares and the 20,455,000-share base used to calculate the 5.9% figure.

Corporate Governance Expert

TL;DR: Disclosure signals a substantial passive stake with conversion exposure; explicit certification of passive intent reduces immediate governance concerns.

The statement that shares are held in the ordinary course and not to influence control is central: it classifies the filing under Schedule 13G rather than 13D, which implies no planned change in governance. However, the inclusion of convertible Class B shares increases potential future voting and economic exposure. Stakeholders should note the conversion component when assessing future governance dynamics.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

SilverBox Corp IV

(Name of Issuer)

Class A Ordinary Shares, par value $0.0001 per share

(Title of Class of Securities)

G81354105

(CUSIP Number)

06/30/2025

(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 1,228,800.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,228,800.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,228,800.00

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)

5.9 %

12

Type of Reporting Person (See Instructions)

IA, OO

Comment for Type of Reporting Person: Includes 280,000 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"), and Class A Ordinary Shares issuable upon the conversion of class B ordinary shares, par value $0.0001 per share ("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 May 13, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2025, filed with the Securities and Exchange Commission on May 13, 2025, and assumes the conversion of the Class B Ordinary Shares held by the Highbridge Funds.
(b)	Percent of class: 5.9%
(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.
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:	08/14/2025

FAQ

What stake in SilverBox Corp IV (SBXD) did Highbridge report?

Highbridge reported beneficial ownership of 1,228,800 Class A Ordinary Shares, representing 5.9% of the Class A shares outstanding.

Does the Schedule 13G filing indicate Highbridge intends to influence control of SBXD?

No. The filing certifies the securities are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer.

How was the 5.9% ownership percentage calculated?

The percentage is calculated using an aggregate of 20,455,000 Class A Ordinary Shares outstanding as of May 13, 2025, and assumes conversion of the Class B shares held by Highbridge Funds.

Does the reported position include convertible shares?

Yes. The report includes 280,000 Class A shares issuable upon conversion of Class B Ordinary Shares held by the Highbridge Funds.

Who signed the Schedule 13G for Highbridge?

The filing is signed by Kirk Rule, Executive Director of Highbridge Capital Management, LLC, dated 08/14/2025.