Coverage description
An Insurance Services Office (ISO) standard form. It makes anyone you agree in a written contract to add as an additional insured, while you perform operations for them, an insured for injury or damage caused by your ongoing operations, with exclusions for professional services and completed work.
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 additional insured's limit is now the lesser of the contract requirement or the applicable limits of insurance, no longer tied only to the limits shown in the Declarations.
04 13
“This endorsement shall not increase the applicable Limits of Insurance shown in the Declarations.”
12 19
“This endorsement shall not increase the applicable limits of insurance.”
04 13 edition
Apr 2013, compared with 07 04Coverage for the additional insured now applies only to the extent permitted by law and is no broader than the contract requires.
07 04
Not in this edition
04 13
“Will not be broader than that which you are required by the contract or agreement to provide for such additional insured.”
The professional services exclusion now also applies to claims alleging negligent supervision, hiring, employment, training or monitoring.
07 04
Not in this edition
04 13
“This exclusion applies even if the claims against any insured allege negligence or other wrongdoing in the supervision, hiring, employment, training or monitoring”
A new limits provision caps what is paid for the additional insured at the lesser of the amount the contract requires or the available limits.
07 04
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 | 137 | 79 | 36 | Nov 2021 to Oct 2026 |
| 04 13Apr 2013 | 42 | 22 | 16 | Dec 2021 to Oct 2026 |
| 07 04Jul 2004 | 12 | 4 | 12 | Oct 2022 to Mar 2024 |
| 10 01Oct 2001 | 15 | 2 | 13 | Feb 2023 to Oct 2023 |
3 other edition dates appear in one or two filings each, often carrier-specific versions: 05 20, 03 97, 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, 26 companies filed the 12 19 edition and 8 companies filed 04 13.
- CG 20 01 (Primary and Noncontributory - Other Insurance Condition) is filed alongside it most often, in 158 of the same filings (88%).
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 33, out of 49 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Markel Corporation Group3 group companies filed it, led by State National Insurance Company, Inc. and Markel Insurance Company | 27 | 15 | 04 1310 0107 04 | Oct 22, 2026 |
| 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 |
| Tokio Marine Holdings Incorporated Group5 group companies filed it, led by Safety National Casualty Corporation and TNUS Insurance Company | 9 | 2 | 12 19 | Feb 17, 2026 |
| Sompo GroupSompo America Insurance Company | 7 | 2 | 12 19 | Jun 18, 2026 |
| Starr Group2 group companies filed it, led by Starr Indemnity and Liability Company and Starr Specialty Insurance Company | 7 | 2 | 12 1904 1310/1/2020 | Apr 13, 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 |
| Hastings Mutual Insurance Company | 6 | 5 | 12 19 | Mar 13, 2025 |
| Siriuspoint GroupSiriusPoint America Insurance Company | 6 | 2 | 12 19 | Jun 15, 2026 |
How the largest insurers handle CG 20 33
Groups among the largest commercial general liability insurers that filed CG 20 33 or their own version in the past five years.
- Berkshire Hathaway GroupUses CG 20 33 in 1 filing
- WR Berkley Corporation GroupUses CG 20 33 in 1 filing
- Fairfax Financial GroupUses CG 20 33 in 2 filings
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States
Number of filings that include CG 20 33 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 01Primary and Noncontributory - Other Insurance Condition158 filings
- CG 20 10Additional Insured - Owners, Lessees or Contractors - Scheduled Person or Organization155 filings
- CG 20 28Additional Insured – Lessor of Leased Equipment153 filings
- CG 20 38Additional Insured - Owners, Lessees or Contractors - Automatic Status for Other Parties When Required in Written Construction Agreement153 filings
- CG 20 15Additional Insured – Vendors152 filings
- CG 20 26Additional Insured – Designated Person or Organization151 filings
- CG 20 11Additional Insured – Managers or Lessors of Premises150 filings
- CG 20 12Additional Insured - State or Governmental Agency or Subdivision or Political Subdivision - Permits or Authorizations150 filings
- CG 20 34Additional Insured - Lessor of Leased Equipment - Automatic Status When Required in Lease Agreement with You150 filings
- CG 20 18Additional Insured – Mortgagee, Assignee or Receiver149 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 |
| Aug 17, 2026 | Mississippi Farm Bureau Casualty Insurance Company | MS | 12 19 | SFBC-135017175 |
| Jul 10, 2026 | Southern Farm Bureau Casualty Insurance Company | LA | 12 19 | SFBC-135013358 |
| Jul 2, 2026 | State National Insurance Company, Inc. | CO | 04 13 | STNA-135002472 |
| 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 |
| Jun 2, 2026 | Zenith Insurance Company | CA | 12 19 | ZICO-134965759 |
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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