The 2026 cyber-insurance renewal tightening enterprises are experiencing is upstream-driven by reinsurance market repricing of catastrophic AI tail risk (Lloyd's of London, Munich Re, Swiss Re), not by primary-carrier loss data. The reinsurance signal travels via tighter treaty terms, AI-specific exclusions, and elevated retentions, with a 6-12 month lag to primary policies. Enterprise risk officers negotiating against the primary on AI terms have limited room because the carrier's own treaty caps what it can offer.

Cross-domain: reinsurance market structure intersected with AI catastrophic-scenario modelling. Cat-bond cyber issuance has tightened; Lloyd's Futureset programme + Munich Re Cyber Insurance Risk Report + Swiss Re sigma research carry the published modelling. Pairs with AM-116 (D&O) and OPS-014 (vendor due diligence) at the residual-exposure layer.