Coverage description
An Insurance Services Office (ISO) standard form. It excludes umbrella liability for claims or suits brought by one Named Insured against another Named Insured for bodily injury, property damage or personal and advertising injury.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 04 13Apr 2013Latest | 57 | 33 | 17 | May 2022 to Aug 2026 |
1 other edition date appears in one or two filings each, often carrier-specific versions: 04 92.
What the filings show
- Edition in use: in the past 12 months, 13 companies filed the 04 13 edition.
- CU 21 59 (Exclusion - Diagnostic Testing Laboratories) is filed alongside it most often, in 55 of the same filings (95%).
Filed under
Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Aug 2026, excluding withdrawn and rejected filings.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 CU 21 26, out of 23 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Grinnell Mutual GroupGrinnell Mutual Reinsurance Company | 10 | 10 | 04 13 | Mar 26, 2024 |
| Nationwide Corporation Group4 group companies filed it, led by Nationwide Agribusiness Insurance Company and Crestbrook Insurance Company | 8 | 3 | 04 13 | Jun 30, 2026 |
| Tokio Marine Holdings Incorporated Group2 group companies filed it, led by Safety National Casualty Corporation and Philadelphia Indemnity Insurance Company | 7 | 3 | 04 13 | Aug 11, 2026 |
| Church Mutual GroupChurch Mutual Insurance Company, S.I. | 5 | 2 | 04 13 | Jun 26, 2026 |
| Sompo GroupSompo America Insurance Company | 5 | 1 | 04 13 | Jun 15, 2026 |
| AU Holding Company GroupContinental Indemnity Company | 2 | 2 | 04 13 | May 3, 2024 |
| American Family Insurance GroupMidvale Indemnity Company | 2 | 2 | 04 13 | Sep 28, 2023 |
| Berkshire Hathaway Group2 group companies filed it, led by The Medical Protective Company and Wellfleet Insurance Company | 2 | 2 | 04 13 | Jun 30, 2026 |
| Encova Mutual Insurance Group3 group companies filed it, led by Motorists Mutual Insurance Company and Wilson Mutual Insurance Company | 2 | 2 | 04 13 | Jun 25, 2024 |
| Mountain West Farm GroupMountain West Farm Bureau Mutual Insurance Company | 2 | 2 | 04 13 | Oct 16, 2023 |
How the largest insurers handle CU 21 26
Groups among the largest commercial umbrella and excess insurers that filed CU 21 26 or their own version in the past five years.
- Berkshire Hathaway GroupUses CU 21 26 in 1 filing
- WR Berkley Corporation GroupFiles its own version: CL CU 2262 Exclusion - Cross Suits Liability (4 states)
- Fairfax Financial GroupUses CU 21 26 in 1 filing
See more forms
Search related forms, compare editions, and research carrier filings with FilingFocus.
States
Number of filings that include CU 21 26 in each state, Oct 2021 to Aug 2026. Darker states have more filings.
Often filed with
Standard-style form numbers that appear in the same filings most often.
- CU 21 59Exclusion - Diagnostic Testing Laboratories55 filings
- CU 22 83Professional Liability Exclusion - Computer Software53 filings
- CU 24 32Limited Coverage Territory52 filings
- CU 22 68Exclusion - Professional Services - Blood Banks51 filings
- CU 24 13Amendment Of Personal And Advertising Injury Definition51 filings
- CU 21 90Public Or Livery Passenger Conveyance And On-Demand Delivery Services Exclusion49 filings
- CU 00 01Commercial Liability Umbrella Coverage Form47 filings
- CU 21 86Exclusion - Access Or Disclosure Of Confidential Or Personal Material Or Information47 filings
- CU 21 02Exclusion - Products- Completed Operations Hazard46 filings
- CU 21 06Exclusion - Personal and Advertising Injury46 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Aug 12, 2026 | Colonial Surety Company | SC | 04 13 | MRTN-134978915 |
| Aug 11, 2026 | Philadelphia Indemnity Insurance Company | SC | 04 13 | PHLX-135041545 |
| Jul 2, 2026 | Zenith Insurance Company | CA | 04 13 | ZICO-134998423 |
| Jun 30, 2026 | The Medical Protective Companyand 1 more | IL | 04 13 | MDPC-135002488 |
| Jun 30, 2026 | Crestbrook Insurance Companyand 1 more | CO | 04 13 | NWPP-135003098 |
| Jun 26, 2026 | Church Mutual Insurance Company, S.I. | CO | 04 13 | CHMU-134995025 |
| Jun 19, 2026 | Addison Insurance Companyand 1 more | CO | 04 13 | UNFG-134979875 |
| Jun 15, 2026 | Sompo America Insurance Company | CO | 04 13 | SMPJ-134971280 |
| Jun 2, 2026 | Philadelphia Indemnity Insurance Company | IL | 04 13 | PHLX-134967828 |
| Feb 17, 2026 | Safety National Casualty Corporation | CO | 04 13 | SFCC-134815068 |
| Nov 22, 2025 | The Medical Protective Companyand 1 more | WA | 04 13 | MDPC-134692417 |
| Nov 11, 2025 | Southern Farm Bureau Casualty Insurance Company | LA | 04 13 | SFBC-134733493 |
Most filed ISO CU forms
- CU 34 54 Exclusion - Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)
- CU 21 86 Exclusion – Access Or Disclosure Of Confidential Or Personal Material Or Information
- CU 00 05 Exclusion - Violation of Law Addressing Data Privacy
- CU 34 56 Exclusion – Cyber Incident
- CU DS 01 Commercial Liability Umbrella Declarations
- CU 21 88 Exclusion - Access Or Disclosure Of Confidential Or Personal Material Or Information (Coverage B Only)
- CU 34 44 Broad Abuse or Molestation Exclusion
- CU 34 55 Exclusion - Electronic Data - Deletion Of Bodily Injury Exception
- CU 22 37 Motor Carrier Endorsement
- CU 21 87 Exclusion - Access Or Disclosure Of Confidential Or Personal Information and Data-Related Liability - Limited Bodily Injury Exception Not Included
- CU 04 02 Loss Of Electronic Data Resulting From Physical Injury To Tangible Property Liability Coverage - Subject To Cyber Incident Exclusion
- CU 04 54 Loss of Electronic Data Resulting From Physical Injury To Tangible Property Liability Coverage - Subject To Cyber Incident Exclusion - Deletion Of Bodily Injury Exception
See more carrier forms
Search forms by carrier, line of business, state, and wording with FilingFocus.