Coverage description
An Insurance Services Office (ISO) standard form. It adds as additional insureds the owners, co-owners, joint venturers, mining partners or LLCs with a nonoperating working interest in an oil or gas lease you operate, only for liability arising from that interest, with limits capped at what a contract requires.
How the form has changed
4 changes across 2 revisions, newest first. Each edition is compared with the one before it, using wording from filed copies.
12 19 edition
Dec 2019, compared with 04 13Latest editionThe cap on what is paid for an additional insured now refers to the applicable limits of insurance rather than the limits shown in the Declarations.
04 13
“Available under the applicable Limits of Insurance shown in the Declarations”
12 19
Removed
04 13 edition
Apr 2013, compared with 01 96Coverage for these additional insureds now applies only to the extent permitted by law.
01 96
Not in this edition
04 13
“The insurance afforded to such additional insured only applies to the extent permitted by law”
When a contract requires the coverage, it is no broader than the contract requires.
01 96
Not in this edition
04 13
“will not be broader than that which you are required by the contract or agreement to provide”
A new limits provision caps payment for an additional insured at the lesser of the contract requirement or the available limits.
01 96
Not in this edition
04 13
“the most we will pay on behalf of the additional insured is the amount of insurance”
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 12 19Dec 2019Latest | 116 | 63 | 31 | Nov 2021 to Oct 2026 |
| 04 13Apr 2013 | 23 | 20 | 7 | Dec 2021 to Oct 2026 |
| 01 96Jan 1996 | 5 | 3 | 5 | Nov 2021 to Mar 2024 |
1 other edition date appears in one or two filings each, often carrier-specific versions: 10/1/2020.
Where filings record what this form replaced, they name earlier edition 04 13. Only some filings record replacements.
What the filings show
- Edition in use: in the past 12 months, 21 companies filed the 12 19 edition and 7 companies filed 04 13.
- CG 20 27 (Additional Insured - Co-Owner of Insured Premises) is filed alongside it most often, in 139 of the same filings (100%).
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Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Oct 2026, excluding withdrawn and rejected filings.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 20 30, out of 40 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Cincinnati Financial Group3 group companies filed it, led by The Cincinnati Casualty Company and The Cincinnati Indemnity Company | 16 | 16 | 12 19 | Oct 23, 2023 |
| WCF Mutual Insurance Company GroupAssociated Indemnity Corporation | 16 | 16 | 12 19 | Jan 15, 2026 |
| Nationwide Corporation Group8 group companies filed it, led by Allied Insurance Company of America and Nationwide Agribusiness Insurance Company | 10 | 3 | 04 1312 19 | Feb 12, 2025 |
| Markel Corporation Group2 group companies filed it, led by State National Insurance Company, Inc. and Markel Insurance Company | 9 | 4 | 12 1904 1301 96 | Oct 22, 2026 |
| Tokio Marine Holdings Incorporated Group4 group companies filed it, led by Safety National Casualty Corporation and TNUS Insurance Company | 8 | 2 | 12 19 | Feb 17, 2026 |
| Sompo GroupSompo America Insurance Company | 7 | 2 | 12 19 | Jun 18, 2026 |
| Grange Mutual CAS Group3 group companies filed it, led by Grange Indemnity Insurance Company and Grange Insurance Company | 6 | 6 | 12 19 | Mar 28, 2024 |
| Siriuspoint GroupSiriusPoint America Insurance Company | 6 | 2 | 12 19 | Jun 15, 2026 |
| Church Mutual GroupChurch Mutual Insurance Company, S.I. | 5 | 2 | 12 19 | Jun 26, 2026 |
| Hastings Mutual Insurance Company | 5 | 4 | 12 19 | Mar 13, 2025 |
How the largest insurers handle CG 20 30
Groups among the largest commercial general liability insurers that filed CG 20 30 or their own version in the past five years.
- Berkshire Hathaway GroupUses CG 20 30 in 1 filing
- WR Berkley Corporation GroupUses CG 20 30 in 1 filing
- Fairfax Financial GroupUses CG 20 30 in 1 filing
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States
Number of filings that include CG 20 30 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 20 27Additional Insured - Co-Owner of Insured Premises139 filings
- CG 20 07Additional Insured - Engineers, Architects or Surveyors138 filings
- CG 20 12Additional Insured – State or Governmental Agency or Subdivision or Political Subdivision – Permits or Authorizations138 filings
- CG 20 15Additional Insured – Vendors138 filings
- CG 20 18Additional Insured – Mortgagee, Assignee or Receiver138 filings
- CG 20 23Additional Insured - Executors, Administrators, Trustees or Beneficiaries138 filings
- CG 20 24Additional Insured - Owners or Other Interests From Whom Land Has Been Leased138 filings
- CG 21 66Exclusion – Volunteer Workers as Insureds138 filings
- CG 20 05Additional Insured – Controlling Interest137 filings
- CG 20 11Additional Insured – Managers or Lessors of Premises137 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 19 | STNA-135128706 |
| Oct 6, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | CA | 12 1904 13 | CNAB-135091690 |
| Jun 26, 2026 | Church Mutual Insurance Company, S.I. | CO | 12 19 | CHMU-134947220 |
| Jun 24, 2026 | Southern Trust Insurance Company | GA | 12 19 | STTR-134864949 |
| Jun 18, 2026 | Sompo America Insurance Company | CO | 12 19 | SMPJ-134985965 |
| Jun 17, 2026 | Atlantic Specialty Insurance Company | NM | 12 1904 13 | BEAC-134983795 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 12 19 | MRTN-134978899 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 12 19 | MRTN-134978902 |
| Mar 20, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | CO | 12 1904 13 | CNAB-134872676 |
| Feb 24, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | SC | 12 1904 13 | CNAB-134851008 |
| Feb 17, 2026 | Safety National Casualty Corporation | CO | 12 19 | SFCC-134814522 |
| Feb 6, 2026 | Crum and Forster Indemnity Company | CA | 12 19 | 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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