**The 78.8% market-implied probability that Paramount will not close its Warner Bros. Discovery acquisition by December 31, 2026, reflects the binding impact of ongoing U.S. state-level antitrust litigation.** A coalition of 12 states led by California sued in July 2026 to block the $110–111 billion all-cash deal on grounds of reduced competition in film distribution, streaming, and cable. This prompted a federal temporary restraining order and a July 24, 2026, stipulation under which Paramount agreed not to close before June 1, 2027, or shortly after a merits trial. The trial is now calendared for March 2027, with the original Q3 2026 target date already missed. International approvals (EU, UK, China, Mexico, Turkey) and the DOJ’s earlier clearance have been secured, but the state actions create an enforceable pause. Daily ticking fees accruing after September 30, 2026, add financial pressure but do not alter the judicial timeline. Traders therefore view closure inside the next four months as highly improbable absent an unexpected rapid settlement or injunction lift, both of which face substantial procedural and political hurdles.