Coverage description
An Insurance Services Office (ISO) standard form. It excludes injury or damage arising directly or indirectly from a certified act of terrorism under commercial excess liability, and makes terrorism endorsements on the controlling underlying insurance inapplicable to the excess policy.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 01 15Jan 2015Latest | 56 | 44 | 11 | Dec 2021 to Jun 2026 |
What the filings show
- Edition in use: in the past 12 months, 17 companies filed the 01 15 edition.
- CX 21 30 (Cap on Losses From Certified Acts of Terrorism) is filed alongside it most often, in 51 of the same filings (91%).
Filed under
Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Jun 2026, excluding withdrawn and rejected filings. One filing can cover several affiliated companies.
Carriers filing this form
The 10 carrier groups with the most filings that include CX 21 33, out of 22 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| WR Berkley Corporation Group14 group companies filed it, led by Acadia Insurance Company and Continental Western Insurance Company | 9 | 1 | 01 15 | Jun 19, 2026 |
| ACP Insurance Mgmt LLC GroupAccelerant National Insurance Company | 6 | 5 | 01 15 | Apr 29, 2025 |
| Tokio Marine Holdings Incorporated Group2 group companies filed it, led by Safety National Casualty Corporation and U.S. Specialty Insurance Company | 6 | 2 | 01 15 | Feb 17, 2026 |
| Sompo GroupSompo America Insurance Company | 5 | 1 | 01 15 | Jun 15, 2026 |
| Amtrust Financial Services Group2 group companies filed it, led by Southern Insurance Company and First Nonprofit Insurance Company | 4 | 4 | 01 15 | Nov 10, 2023 |
| OLD Republic GroupOld Republic Insurance Company | 4 | 1 | 01 15 | Jun 30, 2025 |
| AU Holding Company Group2 group companies filed it, led by Continental Indemnity Company and Pennsylvania Insurance Company | 3 | 3 | 01 15 | May 6, 2024 |
| Andover Group2 group companies filed it, led by Merrimack Mutual Fire Insurance Company and Cambridge Mutual Fire Insurance Company | 2 | 2 | 01 15 | Apr 25, 2024 |
| Church Mutual GroupChurch Mutual Insurance Company, S.I. | 2 | 1 | 01 15 | Jun 15, 2023 |
| LIO Holdings Company GroupLIO Insurance Company | 2 | 2 | 01 15 | Jul 27, 2023 |
How the largest insurers handle CX 21 33
Groups among the largest commercial umbrella and excess insurers that filed CX 21 33 or their own version in the past five years.
- Chubb Limited GroupFiles its own version: XSP-59424 Exclusion of Certified Acts of Terrorism (30 states)
- Berkshire Hathaway GroupUses CX 21 33 in 1 filing
- Fairfax Financial GroupFiles its own version: UM 0010600 Exclusion of Certified Acts of Terrorism (9 states)
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States
Number of filings that include CX 21 33 in each state, Oct 2021 to Jun 2026. Darker states have more filings.
Often filed with
Standard-style form numbers that appear in the same filings most often.
- CX 21 30Cap on Losses From Certified Acts of Terrorism51 filings
- CX 00 01Commercial Excess Liability Coverage Form50 filings
- CX 21 29Conditional Exclusion of Terrorism (Relating to Disposition of Federal Terrorism Risk Insurance Act)47 filings
- CX 21 36Exclusion of Punitive Damages Related to a Certified Act of Terrorism46 filings
- CX 21 45Exclusion of Certified Nuclear, Biological, Chemical or Radiological Acts of Terrorism; Cap on Losses From Certified Acts of Terrorism46 filings
- CX 21 32Conditional Exclusion of Terrorism Involving Nuclear, Biological or Chemical Terrorism (Relating to Disposition of Federal Terrorism Risk Insurance Act)44 filings
- CX 21 35Exclusion of Certified Acts of Terrorism and Exclusion of Other Acts of Terrorism Committed Outside the United States44 filings
- CX 21 31Exclusion of Other Acts of Terrorism Committed Outside the United States; Cap on Losses From Certified Acts of Terrorism43 filings
- CX 21 34Extended Reporting Period for Terrorism Coverage43 filings
- CX 21 01Nuclear Energy Liability Exclusion Endorsement40 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Jun 19, 2026 | Acadia Insurance Companyand 4 more | CO | 01 15 | BNIC-134992811 |
| Jun 19, 2026 | Berkley Casualty Companyand 8 more | CO | 01 15 | BNIC-134992815 |
| Jun 15, 2026 | Sompo America Insurance Company | CO | 01 15 | SMPJ-134971280 |
| Feb 17, 2026 | Safety National Casualty Corporation | CO | 01 15 | SFCC-134815068 |
| Nov 13, 2025 | U.S. Specialty Insurance Company | CA | 01 15 | HCCH-134700305 |
| Jul 1, 2025 | Berkley Casualty Companyand 8 more | CO | 01 15 | BNIC-134587731 |
| Jun 30, 2025 | Old Republic Insurance Company | CO | 01 15 | LDDX-134589971 |
| Jun 27, 2025 | Next Insurance US Company | CA | 01 15 | NXUS-134584662 |
| Jun 26, 2025 | Sompo America Insurance Company | CO | 01 15 | SMPJ-134585643 |
| Jun 24, 2025 | Explorer Insurance Companyand 2 more | CA | 01 15 | ICWG-134580186 |
| Jun 20, 2025 | Acadia Insurance Companyand 4 more | CO | 01 15 | BNIC-134576839 |
| Jun 5, 2025 | CLEAR SPRING PROPERTY AND CASUALTY COMPANY | IL | 01 15 | CSPC-134479715 |
Most filed ISO CX forms
- CX DS 01 Commercial Excess Liability Declarations
- CX 21 43 Exclusion - Access Or Disclosure Of Confidential Or Personal Material Or Information
- CX 00 01 Commercial Excess Liability Coverage Form
- CX 21 04 Total Pollution Exclusion With A Building Heating, Cooling and Dehumidifying Equipment Exception and a Hostile Fire Exception
- CX 21 93 Broad Abuse Or Molestation Exclusion
- CX 21 94 Sexual Abuse Or Sexual Molestation Exclusion
- CX 21 97 Exclusion - Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)
- CX 21 10 Limitation Of Coverage To Designated Premises, Project Or Operation
- CX 21 79 Cannabis Exclusion
- CX 21 80 Cannabis Exclusion With Hemp Exception
- CX 21 81 Cannabis Exclusion With Hemp And Lessors Risk Exceptions
- CX 21 11 Exclusion – Abuse Or Molestation
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