CX 27 01 Extended Reporting Period Endorsement

An Insurance Services Office (ISO) standard form. It provides the extended reporting period for claims-made underlying coverage and, when the controlling underlying insurance has a supplemental aggregate, adds a separate supplemental aggregate limit for claims first made during that period.

• Edition in use: in the past 12 months, 19 companies filed the 09 08 edition.
• CX 27 00 (Underlying Claims- Made Coverage) is filed alongside it most often, in 45 of the same filings (87%).

Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Aug 2026, excluding withdrawn and rejected filings. One filing can cover several affiliated companies.

• Berkshire Hathaway GroupFiles its own version: URF 270002 Extended Reporting Period Endorsement (2 states)
• Fairfax Financial GroupFiles its own version: ESM-XS-E19 Extended Reporting Period Endorsement (1 state)

• CX 27 00Underlying Claims- Made Coverage45 filings
• CX 00 01Commercial Excess Liability Coverage Form43 filings
• CX 21 55Auto Coverage - Amended Terrorism Provisions43 filings
• CX 21 34Extended Reporting Period for Terrorism Coverage42 filings
• CX 21 45Exclusion of Certified Nuclear, Biological, Chemical or Radiological Acts of Terrorism; Cap on Losses From Certified Acts of Terrorism41 filings
• CX 21 29Conditional Exclusion of Terrorism (Relating to Disposition of Federal Terrorism Risk Insurance Act)40 filings
• CX 21 30Cap on Losses From Certified Acts of Terrorism40 filings
• CX 21 31Exclusion of Other Acts of Terrorism Committed Outside the United States; Cap on Losses From Certified Acts of Terrorism40 filings
• CX 21 32Conditional Exclusion of Terrorism Involving Nuclear, Biological or Chemical Terrorism (Relating to Disposition of Federal Terrorism Risk Insurance Act)40 filings
• CX 21 33Exclusion of Certified Acts of Terrorism40 filings