Welcome to our dedicated page for SilverBox SEC filings (Ticker: SBXD), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
SilverBox Corp IV (SBXD) files a range of documents with the U.S. Securities and Exchange Commission (SEC) that detail its activities as a New York Stock Exchange-listed special purpose acquisition company (SPAC). On this page, investors can review SBXD’s SEC filings, including current reports on Form 8-K that describe material events connected to its proposed business combination with Parataxis Holdings LLC and Parataxis Holdings Inc. (Pubco).
The company’s Form 8-K filings outline key steps in the transaction process, such as the execution and amendment of the Business Combination Agreement, the filing of the Registration Statement on Form S-4 that includes a preliminary proxy statement and prospectus, and changes to preferred equity subscription agreements related to Bitcoin purchases by Parataxis Holdings. Other 8-K reports address governance matters, including director resignations and appointments and committee assignments.
For a SPAC like SilverBox Corp IV, investors often focus on filings that explain the structure and consideration of the business combination, the treatment of public shares and warrants, and the conditions that must be satisfied before closing. The Registration Statement on Form S-4, referenced repeatedly in SBXD’s 8-Ks, is central to understanding the proposed mergers that will result in SilverBox Corp IV and Parataxis Holdings LLC becoming wholly owned subsidiaries of Pubco.
Stock Titan’s platform provides access to these SEC filings with AI-powered summaries that help explain complex transaction terms and risk disclosures in clearer language. Users can quickly see the main points of lengthy documents such as Form 8-Ks and the S-4 Registration Statement, while still being able to open the full text for detailed review. Real-time updates from EDGAR ensure that new filings, including any future proxy materials or additional current reports, are available as soon as they are posted, supporting investors who monitor SBXD’s progress toward its initial business combination.
Polar Asset Management Partners Inc. reports beneficial ownership of 1,480,000 Class A ordinary shares of Silverbox Corp IV, representing 7.2% of the class. The filing is a Schedule 13G/A amendment and shows Polar holds sole voting and sole dispositive power over the shares.
The filing states Polar serves as investment adviser to Polar Multi-Strategy Master Fund and that the securities are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer. The disclosure provides clarity on a material passive stake above 5% in Silverbox Corp IV.
SilverBox Corp IV disclosed that AQR Capital Management, LLC, AQR Capital Management Holdings, LLC and AQR Arbitrage, LLC collectively beneficially own 1,347,002 Class A ordinary shares, equal to 6.59% of the class. The reporting parties state they possess shared voting and shared dispositive power over these shares and report no sole voting or sole dispositive power, indicating coordinated institutional ownership rather than unilateral control.
The filers certify the securities are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer. The disclosure therefore documents a material passive stake by a large investment adviser group without signaling an active governance or control intent.
SilverBox Corp IV is reported as being beneficially owned, in part, by The Goldman Sachs Group, Inc. and its subsidiary Goldman Sachs & Co. LLC. The filers disclose shared voting and dispositive power over 1,606,929 Class A ordinary shares, representing 7.9% of the class. The schedule is a joint filing by the parent and its broker/dealer subsidiary and includes an agreement authorizing joint amendments and an exhibit identifying the subsidiary that holds the reported position. The filers state the securities are held in the ordinary course of business and not for the purpose of changing control.
Healthcare of Ontario Pension Plan Trust Fund (HOOPP) reports beneficial ownership of 100,000 Class A ordinary shares of SilverBox Corp IV, representing 0.5% of the outstanding Class A shares based on 20,455,000 shares reported by the issuer. The position consists of 99,998 Class A shares plus 2 Class A shares held in units that include one-third of a redeemable warrant; whole warrants are exercisable at $11.50 per share. HOOPP states these securities are held in the ordinary course of business and were not acquired to influence control. HOOPP is a pension plan trust formed under Ontario law and reports sole voting and dispositive power over the 100,000 shares.
Barclays PLC reports beneficial ownership of 970,927 shares of SilverBox Corp IV common stock, representing 4.74% of the class. The filing states Barclays has sole voting and sole dispositive power over these shares, meaning it controls how the shares are voted and disposed. The schedule identifies Barclays Bank PLC as the subsidiary that acquired the securities and classifies the filer as a holding company. The filer certifies the shares were acquired and are held in the ordinary course of business and not to influence control of the issuer.
SilverBox Corp IV (SBXD) is a blank-check company that held $208,952,965 in a trust and reported total assets of $209,469,723 at June 30, 2025. The company generated $4.30 million of interest on trust investments for the six months and reported $3.39 million net income for the same period, while operating costs were $904,943 for six months. Cash outside the trust was $279,366 with working capital of $454,784, and Class A shares subject to redemption were recorded at a redemption value of $208,952,965.
The balance sheet shows material deferred obligations, including a $10.3 million deferred underwriting fee and $975,661 of deferred legal fees. Management disclosed substantial doubt about the company’s ability to continue as a going concern within one year absent additional financing. In subsequent events, on August 6, 2025 the company entered a business combination agreement with Parataxis and agreed to engage Santander US Capital Markets for advisory services with fees up to $10.3 million.
SilverBox Corp IV (NYSE:SBXD) filed an 8-K reporting a board transition effective June 25 2025.
Director Matthew Eilers resigned to avoid potential conflicts after joining an investment bank. The Board concurrently appointed Glenn Marino—a 30-year consumer-finance veteran and former Synchrony Financial CCO—as director and member of the Audit, Compensation, and Nominating & Governance committees.
- The Board designated Marino an “audit committee financial expert” under SEC rules.
- Standard indemnification executed; Marino is bound by the SPAC IPO letter to support the initial business combination.
- Eilers’ departure involved no disagreement regarding company policies.
No related-party transactions or family ties were disclosed.
SilverBox Corp IV (NYSE: SBXD) filed a Form 8-K on June 20, 2025 under Item 7.01 (Regulation FD Disclosure). The filing reiterates that SBXD and Parataxis Holdings LLC signed a non-binding letter of intent on June 9, 2025 regarding a potential business combination. The new disclosure attaches a press release (Exhibit 99.1) issued the same day by Parataxis Holdings announcing a definitive agreement to acquire a controlling interest in Bridge Biotherapeutics, Inc. (KOSDAQ: 288330). Parataxis intends to use this acquisition to establish an institutionally backed Bitcoin treasury company that would be listed on the South Korean public markets.
The 8-K expressly states that the information—including Exhibit 99.1—is being “furnished” rather than “filed”, meaning it is not subject to Section 18 liability and will not be incorporated by reference into SBXD’s Securities Act or Exchange Act filings. No financial statements, pro-forma data, or valuation terms are provided, and SBXD remains in the due-diligence stage: no definitive business-combination agreement has been executed yet.
SBXD advises shareholders that, if a definitive agreement is reached, a newly formed holding company (“PubCo”) together with SBXD and Parataxis Holdings will prepare a registration statement and proxy statement/prospectus, which will be mailed to SBXD shareholders and filed with the SEC. The company directs investors to review those future filings, along with SBXD’s Form 10-K for the year ended December 31, 2024, for detailed risk factors and ownership information.
The filing includes standard forward-looking-statement disclaimers highlighting risks such as potential termination of negotiations, regulatory approvals, listing uncertainties, and market demand for digital assets in South Korea. It also clarifies that the 8-K does not constitute an offer or solicitation related to any securities.
Key take-away for investors: The disclosure signals incremental progress toward a possible SPAC merger, but material deal terms, financial impacts, and closing conditions remain unknown. Until a binding agreement is signed and a registration statement is filed, SBXD’s transaction timeline and economics are speculative.