SoftBank's $40B unsecured bridge loan (signed March 2026, matures March 2027) plus the stalled $10B margin loan sit against ~13% of OpenAI — illiquid while private. The March 2027 maturity forces the IPO and, with it, the valuation: above the $1T Altman floor the pledged shares cover the stack; below it, the corporate guarantee goes live and a forced-sell feedback loop can ignite.