SilverBox Corp IV amends Preferred Equity Subscription Agreements to allow Bitcoin collateralization

SilverBox Corp IV

Amendment removes prohibition on pledging Bitcoin purchased with $31M preferred equity proceeds.
Permits Company to use Bitcoin as collateral or credit support for lending or other financing arrangements.
Original agreements: 3,100,000 preferred units at $10/unit for aggregate $31,000,000, entered Aug 6, 2025.
Amendment date: October 31, 2025; parties: Pubco, Company, and Preferred Equity Investors.
Business combination with Parataxis Holdings still pending; this is a related financing term change.

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