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.
Effective September 28, 2026, SilverBox Corp IV's units, Class A ordinary shares and warrants are quoted and traded on the OTCID, operated by OTC Markets, under the new symbols SBXUF, SBXDF and SBXWF, respectively.
NYSE intends to file a Form 25 to remove the securities from its listing and registration. SilverBox Corp IV says it intends to remain a public reporting company.
SilverBox Corp IV received notice from NYSE Regulation on September 25, 2026, that staff had determined to commence proceedings to delist its units, Class A ordinary shares and warrants. Staff determined the company had fallen below the continued-listing standard requiring an acquisition company to maintain average aggregate global market capitalization attributable to its publicly-held shares of at least $40,000,000 over a consecutive 30 trading day period.
NYSE trading in the securities was suspended as of September 25, 2026. SilverBox has a right to review the determination by a Committee of the NYSE Board of Directors, while the SEC delisting application is pending completion of applicable procedures, including any company appeal. Effective September 28, 2026, the securities may be quoted and traded in the OTC market under SBXD.U, SBXD and SBXD.WS, respectively.
SilverBox Corp IV, a Cayman Islands SPAC, reported net income of $1.7 million for the quarter and $3.0 million for the six months ended June 30, 2026, driven entirely by $3.8 million of interest on investments in its $217.1 million Trust Account, partially offset by $0.8 million of general and administrative expenses.
Cash outside the Trust was only $15,104 with a working capital deficit of $497,133, and management disclosed that liquidity constraints and the requirement to liquidate if no business combination is completed by April 15, 2027 raise substantial doubt about the company’s ability to continue as a going concern. The company has a Business Combination Agreement with Parataxis Holdings LLC and, on August 11, 2026, shareholders approved extending the combination deadline and removing the $5,000,001 net tangible asset redemption limitation, leading to redemptions of about 19.0 million Class A shares for roughly $206.6 million, leaving approximately $10.5 million in the Trust Account.
AQR Capital Management LLC, AQR Capital Management Holdings, LLC, and AQR Arbitrage, LLC report beneficial ownership of Class A ordinary shares of SilverBox Corp IV. The group reports 1,012,401 Class A shares, representing 4.95% of the class.
The AQR entities report no sole voting or dispositive power, and shared voting and shared dispositive power over 1,012,401 shares. The filing notes ownership of 5 percent or less of the class, with AQR Capital Management, LLC identified as a wholly owned subsidiary of AQR Capital Management Holdings, LLC and AQR Arbitrage, LLC deemed controlled by AQR Capital Management, LLC.
W. R. Berkley Corporation, through subsidiary Berkley Insurance Company, reports beneficial ownership of Class A Ordinary Shares of SilverBox Corp IV. 1,923,442 shares are beneficially owned, representing 9.4% of the class. The filing states shared voting power and shared dispositive power over all 1,923,442 shares, with no sole voting or dispositive power reported.
SilverBox Corp IV entered into a Second Amendment to its Business Combination Agreement with Parataxis Holdings entities and related parties. The amendment extends the Outside Date for closing the proposed business combination to December 31, 2026, from August 6, 2026, with a mechanism for further extension if SilverBox’s SPAC deadline is formally extended and both sides agree in writing.
The combination would result in Parataxis Holdings Inc. becoming the publicly listed company, with a Registration Statement on Form S-4 (No. 333-289994) on file that includes a proxy statement/prospectus. Extensive forward-looking disclosures highlight risks tied to completion of the transactions, Bitcoin price volatility, digital asset demand in South Korea, potential listing issues, shareholder redemptions, and future dilution from warrants and a standby equity purchase agreement.
SilverBox Corp IV entered into a Second Amendment to its Business Combination Agreement with Parataxis Holdings entities, extending the contractual Outside Date for closing their proposed business combination from August 6, 2026 to December 31, 2026.
The amendment also permits SBXD and the Parataxis company, by written notice, to further extend the Outside Date if SBXD obtains an extension of its deadline to complete an initial business combination, for a period no longer than the relevant SPAC extension or a shorter period mutually agreed by the parties. Extensive risk disclosures describe volatility and regulatory uncertainty around Bitcoin-focused strategies, South Korean digital-asset markets, and potential dilution from warrants and a standby equity purchase agreement.
SilverBox Corp IV is calling an extraordinary general meeting on August 11, 2026 for shareholders to vote on three proposals. The first would amend its charter to extend the deadline to complete a business combination from August 19, 2026 to December 19, 2026. The second would remove the $5,000,001 net tangible asset “Redemption Limitation,” allowing redemptions even if trust assets fall below that level. The third would permit adjournment if more time is needed to secure votes.
The company is pursuing a proposed business combination with Parataxis Holdings Inc. and cites ongoing registration and proxy work as the reason more time is needed. As of June 30, 2026, the trust account held $217,134,228, implying an estimated redemption price of about $10.85 per public share at the meeting. Shareholders may redeem regardless of how they vote, and will retain redemption and voting rights on a future merger if they do not redeem now.
If the extension and redemption limitation amendments are not approved and no business combination closes by August 19, 2026, the company will liquidate the trust, returning roughly $10.05 per share to public shareholders and winding up, with warrants expiring worthless. There are 25,455,000 ordinary shares outstanding, including 5,000,000 founder shares; the sponsor and insiders, who hold all founder shares, intend to vote in favor. The extension and redemption limitation amendments each require approval by at least two-thirds of votes cast; the adjournment proposal requires a simple majority.
SilverBox Corp IV asks shareholders to approve amendments to its articles to extend the deadline to complete an initial business combination from August 19, 2026 to December 19, 2026 and to remove a <$5,000,001> net tangible asset redemption limit. The amendments would permit public shareholders to elect cash redemption from the trust account in connection with the Extension and would allow the company to pay those redemptions even if they would reduce net tangible assets below $5,000,001. The company completed its IPO on August 19, 2024, raising gross proceeds of $200,000,000, and placed $201,000,000 in the Trust Account. On the record date there were 25,455,000 ordinary shares outstanding (including 20,000,000 public shares and 5,000,000 founder shares); Sponsor holds 5,000,000 founder shares (20.0%). If the amendments are not approved and a business combination is not completed by August 19, 2026, the company will wind up and redeem public shares for the pro rata amount in the Trust Account.
SilverBox Corp IV, a SPAC, reported net income of $1,374,660 for the quarter ended March 31, 2026, driven by $1,870,025 of interest on its Trust Account and offset by $495,365 of general and administrative costs.
Cash outside the trust was only $2,372 with a working capital deficit of $342,040, while $215,217,195 remained invested in the Trust Account. The company has a signed Business Combination Agreement with Parataxis and must close a transaction by August 19, 2026 or liquidate, leading management to state that there is substantial doubt about its ability to continue as a going concern.