Coverage description
An Insurance Services Office (ISO) standard form. It limits excess liability coverage to injury or damage that occurs on the scheduled premises or arises out of the scheduled project or operation, and to personal and advertising injury from your business there.
How the form has changed
2 changes across 1 revision, newest first. Each edition is compared with the one before it, using wording from filed copies.
04 17 edition
Apr 2017, compared with 04 13Coverage now applies only to injury or damage that occurs on the scheduled premises or arises out of the scheduled project or operation, instead of injury or damage arising out of the use of the premises and operations incidental to them.
04 13
“The ownership, maintenance or use of the premises shown in the Schedule and operations necessary or incidental to those premises”
04 17
“Occurs on the premises shown in the Schedule or the grounds and structures appurtenant to those premises”
A separate rule now limits personal and advertising injury to offenses arising out of your business performed on the scheduled premises or in connection with the scheduled project or operation.
04 13
Not in this edition
04 17
“this insurance applies but only if the personal and advertising injury is caused by an offense arising out of your business”
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 06 26Jun 2026Latest | 27 | 2 | 26 | Sep 2025 to Feb 2026 |
| 04 17Apr 2017 | 39 | 25 | 13 | Dec 2021 to Jun 2026 |
| 04 13Apr 2013 | 6 | 2 | 2 | Apr 2022 to Jun 2025 |
Where filings record what this form replaced, they name earlier edition 04 17. Only some filings record replacements.
What the filings show
- Edition in use: in the past 12 months, 2 companies filed the 06 26 edition and 1 company filed 04 17.
- CX 21 14 (Exclusion – Exterior Insulation And Finish Systems) is filed alongside it most often, in 62 of the same filings (86%).
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Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Jun 2026, excluding withdrawn and rejected filings.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 10, out of 22 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Insurance Services Office, Inc.Advisory Organization | 26 | 26 | 06 26 | Jan 14, 2026 |
| Mutual OF Enumclaw GroupMutual of Enumclaw Insurance Company | 5 | 5 | 04 17 | Apr 3, 2023 |
| Sompo GroupSompo America Insurance Company | 5 | 1 | 04 17 | Jun 15, 2026 |
| Tokio Marine Holdings Incorporated GroupSafety National Casualty Corporation | 5 | 1 | 04 1706 26 | Feb 17, 2026 |
| ACP Insurance Mgmt LLC GroupAccelerant National Insurance Company | 4 | 3 | 04 17 | May 13, 2024 |
| OLD Republic GroupOld Republic Insurance Company | 4 | 1 | 04 13 | Jun 30, 2025 |
| AU Holding Company GroupContinental Indemnity Company | 2 | 2 | 04 17 | May 3, 2024 |
| Andover Group2 group companies filed it, led by Merrimack Mutual Fire Insurance Company and Cambridge Mutual Fire Insurance Company | 2 | 2 | 04 17 | Apr 25, 2024 |
| Church Mutual GroupChurch Mutual Insurance Company, S.I. | 2 | 1 | 04 13 | Jun 15, 2023 |
| Farm Bureau GroupWestern Community Insurance Company | 2 | 2 | 04 17 | Mar 6, 2025 |
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States
Number of filings that include CX 21 10 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 14Exclusion – Exterior Insulation And Finish Systems62 filings
- CX 21 20Exclusion – Professional Services62 filings
- CX 21 79Cannabis Exclusion57 filings
- CX 21 80Cannabis Exclusion With Hemp Exception57 filings
- CX 21 81Cannabis Exclusion With Hemp And Lessors Risk Exceptions57 filings
- CU 00 01Commercial Liability Umbrella Coverage Form44 filings
- CU 21 15Exclusion – Financial Services44 filings
- CU 22 94Professional Liability Exclusion – Computer, Telecommunication, Electronic Data Or Internet Services (formerly titled Professional Liability Exclusion – Electronic Data Processing Services And Computer Consulting Or Programming Services)44 filings
- CU 24 13Amendment of Personal and Advertising Injury Definition44 filings
- CU 04 02Loss Of Electronic Data Resulting From Physical Injury To Tangible Property Liability Coverage (formerly titled Loss Of Electronic Data Resulting From Physical Injury To Tangible Property Liability Coverage – Subject To Cyber Incident Exclusion)43 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Jun 15, 2026 | Sompo America Insurance Company | CO | 04 17 | SMPJ-134971280 |
| Feb 17, 2026 | Safety National Casualty Corporation | CO | 06 26 | SFCC-134815068 |
| Jan 14, 2026 | Insurance Services Office, Inc. | VA | 06 26 | ISOF-134799407 |
| Sep 30, 2025 | Insurance Services Office, Inc. | GA | 06 26 | ISOF-134687840 |
| Sep 16, 2025 | Insurance Services Office, Inc. | VT | 06 26 | ISOF-134664793 |
| Sep 15, 2025 | Insurance Services Office, Inc. | LA | 06 26 | ISOF-134664766 |
| Sep 15, 2025 | Insurance Services Office, Inc. | ME | 06 26 | ISOF-134664767 |
| Sep 15, 2025 | Insurance Services Office, Inc. | MD | 06 26 | ISOF-134664768 |
| Sep 15, 2025 | Insurance Services Office, Inc. | OK | 06 26 | ISOF-134664783 |
| Sep 13, 2025 | Insurance Services Office, Inc. | CO | 06 26 | ISOF-134664755 |
| Sep 13, 2025 | Insurance Services Office, Inc. | ID | 06 26 | ISOF-134664760 |
| Sep 13, 2025 | Insurance Services Office, Inc. | MT | 06 26 | ISOF-134664774 |
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 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
- CX 21 18 Exclusion – Abuse Or Molestation – Specified Professional Services
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