Coverage description
An Insurance Services Office (ISO) standard form. It excludes liability and medical payments for injury or damage tied to nuclear material, including where an insured is covered under a nuclear energy liability policy or is protected under federal atomic energy law, for electronic data liability and product withdrawal coverage.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 12 04Dec 2004Latest | 99 | 62 | 23 | Jan 2022 to Oct 2026 |
What the filings show
- Edition in use: in the past 12 months, 25 companies filed the 12 04 edition.
- CG 04 35 (Employee Benefits Liability Coverage) is filed alongside it most often, in 91 of the same filings (92%).
Filed under
Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Oct 2026, excluding withdrawn and rejected filings.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 CG 31 99, out of 33 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| WCF Mutual Insurance Company GroupAssociated Indemnity Corporation | 16 | 16 | 12 04 | Jan 15, 2026 |
| WR Berkley Corporation Group14 group companies filed it, led by Acadia Insurance Company and Continental Western Insurance Company | 9 | 1 | 12 04 | Jun 19, 2026 |
| Markel Corporation GroupState National Insurance Company, Inc. | 7 | 4 | 12 04 | Oct 22, 2026 |
| Siriuspoint GroupSiriusPoint America Insurance Company | 7 | 3 | 12 04 | Jun 15, 2026 |
| Sompo GroupSompo America Insurance Company | 5 | 1 | 12 04 | Jun 18, 2026 |
| Tokio Marine Holdings Incorporated GroupSafety National Casualty Corporation | 5 | 1 | 12 04 | Feb 17, 2026 |
| ACP Insurance Mgmt LLC GroupAccelerant National Insurance Company | 4 | 2 | 12 04 | Dec 8, 2025 |
| Country Insurance & Financial Services GroupCOUNTRY Mutual Insurance Company | 4 | 1 | 12 04 | Jun 11, 2025 |
| Cincinnati Financial Group3 group companies filed it, led by The Cincinnati Casualty Company and The Cincinnati Indemnity Company | 3 | 3 | 12 04 | Jan 4, 2023 |
| Nationwide Corporation Group6 group companies filed it, led by Allied Insurance Company of America and National Casualty Company | 3 | 2 | 12 04 | Feb 12, 2025 |
How the largest insurers handle CG 31 99
Groups among the largest commercial general liability insurers that filed CG 31 99 or their own version in the past five years.
- WR Berkley Corporation GroupFiles its own version: CL PL 2104 Nuclear Energy Liability Exclusion Endorsement (Broad Form) (4 states)
- Fairfax Financial GroupUses CG 31 99 in 1 filing
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States
Number of filings that include CG 31 99 in each state, Oct 2021 to Oct 2026. Darker states have more filings.
Often filed with
Standard-style form numbers that appear in the same filings most often.
- CG 04 35Employee Benefits Liability Coverage91 filings
- IL 00 21Nuclear Energy Liability Exclusion Endorsement (Broad Form)89 filings
- IL 00 17Common Policy Conditions88 filings
- CG 21 47Employment- Related Practices Exclusion84 filings
- CG 27 15Extended Reporting Period Endorsement for Employee Benefits Liability Coverage83 filings
- IL 00 03Calculation of Premium82 filings
- CG 03 00Deductible Liability Insurance (for Use with Cgl and Products Policies)80 filings
- CG 21 73Exclusion of Certified Acts of Terrorism80 filings
- CG 21 76Exclusion of Punitive Damages Related to a Certified Act of Terrorism80 filings
- CG 21 45Exclusion - Damage to Premises Rented to You79 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Oct 22, 2026 | State National Insurance Company, Inc. | CO | 12 04 | STNA-135128706 |
| Jun 19, 2026 | Acadia Insurance Companyand 4 more | CO | 12 04 | BNIC-134992811 |
| Jun 19, 2026 | Berkley Casualty Companyand 8 more | CO | 12 04 | BNIC-134992815 |
| Jun 18, 2026 | Sompo America Insurance Company | CO | 12 04 | SMPJ-134985965 |
| Jun 17, 2026 | Atlantic Specialty Insurance Company | NM | 12 04 | BEAC-134983795 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 12 04 | MRTN-134978899 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 12 04 | MRTN-134978902 |
| Jun 9, 2026 | Accredited Surety and Casualty Company, Inc. | SC | 12 04 | SHNF-134843391 |
| Apr 30, 2026 | Trisura Insurance Company | CA | 12 04 | SHNF-134881681 |
| Mar 18, 2026 | Trisura Insurance Company | SC | 12 04 | SHNF-134843658 |
| Feb 17, 2026 | Safety National Casualty Corporation | CO | 12 04 | SFCC-134814522 |
| Feb 6, 2026 | Crum and Forster Indemnity Company | CA | 12 04 | CRUM-134831877 |
Most filed ISO CG forms
- CG 40 32 Exclusion - Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)
- CG 21 06 Exclusion - Access Or Disclosure Of Confidential Or Personal Material Or Information
- CG 20 10 Additional Insured - Owners, Lessees or Contractors - Scheduled Person or Organization Endorsement
- CG DS 01 Commercial General Liability Declarations
- CG 20 26 Additional Insured - Designated Person or Organization Endorsement
- CG 00 01 Commercial General Liability Coverage Form
- CG 20 37 Additional Insured - Owners, Lessees or Contractors - Completed Operations Endorsement
- CG 40 28 Broad Abuse or Molestation Exclusion
- CG 20 28 Additional Insured - Lessor of Leased Equipment
- CG 20 11 Additional Insured - Managers or Lessors of Premises
- CG 21 47 Employment-Related Practices Exclusion
- CG 04 35 Employee Benefits Liability Coverage
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