Coverage description
An Insurance Services Office (ISO) standard form. It makes the umbrella apply before, and not seek contribution from, other insurance of an additional insured shown in the Schedule when that party is a Named Insured on the other policy and you agreed to this in a written contract.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 12 23Dec 2023Latest | 87 | 35 | 46 | Feb 2023 to Aug 2026 |
What the filings show
- Edition in use: in the past 12 months, 11 companies filed the 12 23 edition.
- CU 21 86 (Exclusion – Access Or Disclosure Of Confidential Or Personal Material Or Information) is filed alongside it most often, in 85 of the same filings (98%).
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Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Aug 2026, excluding withdrawn and rejected filings.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 24 77, out of 15 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Insurance Services Office, Inc.Advisory Organization | 39 | 39 | 12 23 | Nov 3, 2023 |
| Nationwide Corporation Group3 group companies filed it, led by Nationwide Mutual Insurance Company and Crestbrook Insurance Company | 13 | 11 | 12 23 | Jun 30, 2026 |
| Grinnell Mutual GroupGrinnell Mutual Reinsurance Company | 10 | 10 | 12 23 | Mar 26, 2024 |
| Tokio Marine Holdings Incorporated Group2 group companies filed it, led by Safety National Casualty Corporation and Philadelphia Indemnity Insurance Company | 5 | 3 | 12 23 | Aug 11, 2026 |
| Church Mutual GroupChurch Mutual Insurance Company, S.I. | 3 | 2 | 12 23 | Jun 26, 2026 |
| Sompo GroupSompo America Insurance Company | 3 | 1 | 12 23 | Jun 15, 2026 |
| Amtrust Financial Services Group7 group companies filed it, led by AmTrust Insurance Company of Kansas, Inc. and CorePointe Insurance Company | 2 | 1 | 12 23 | Aug 8, 2023 |
| Berkshire Hathaway Group2 group companies filed it, led by The Medical Protective Company and Wellfleet Insurance Company | 2 | 2 | 12 23 | Jun 30, 2026 |
| Mountain West Farm GroupMountain West Farm Bureau Mutual Insurance Company | 2 | 2 | 12 23 | Dec 5, 2023 |
| United Fire & CAS Group2 group companies filed it, led by Addison Insurance Company and United Fire and Casualty Company | 2 | 2 | 12 23 | Jun 19, 2026 |
How the largest insurers handle CU 24 77
Groups among the largest commercial umbrella and excess insurers that filed CU 24 77 or their own version in the past five years.
- Berkshire Hathaway GroupUses CU 24 77 in 1 filing
See more forms
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States
Number of filings that include CU 24 77 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 86Exclusion – Access Or Disclosure Of Confidential Or Personal Material Or Information85 filings
- CU 34 56Exclusion – Cyber Incident85 filings
- CU 00 05Exclusion - Violation Of Law Addressing Data Privacy83 filings
- CU 04 02Loss Of Electronic Data Resulting From Physical Injury To Tangible Property Liability Coverage - Subject To Cyber Incident Exclusion72 filings
- CU 22 37Motor Carrier Endorsement71 filings
- CU 34 55Exclusion - Electronic Data - Deletion Of Bodily Injury Exception71 filings
- CU 04 54Loss of Electronic Data Resulting From Physical Injury To Tangible Property Liability Coverage - Subject To Cyber Incident Exclusion - Deletion Of Bodily Injury Exception70 filings
- CU 21 88Exclusion - Access Or Disclosure Of Confidential Or Personal Material Or Information (Coverage B Only)70 filings
- CU 04 98Cyber Incident Liability Coverage Subject To Each Cyber Incident Occurrence And Aggregate Limits69 filings
- CU 04 99Cyber Incident Liability Coverage And Loss Of Electronic Data Liability Coverage Subject To Loss Of Electronic Data, Each Cyber Incident Occurrence And Aggregate Limits69 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Aug 11, 2026 | Philadelphia Indemnity Insurance Company | SC | 12 23 | PHLX-135041545 |
| Jun 30, 2026 | The Medical Protective Companyand 1 more | IL | 12 23 | MDPC-135002488 |
| Jun 30, 2026 | Crestbrook Insurance Companyand 1 more | CO | 12 23 | NWPP-135003098 |
| Jun 26, 2026 | Church Mutual Insurance Company, S.I. | CO | 12 23 | CHMU-134995025 |
| Jun 19, 2026 | Addison Insurance Companyand 1 more | CO | 12 23 | UNFG-134979875 |
| Jun 15, 2026 | Sompo America Insurance Company | CO | 12 23 | SMPJ-134971280 |
| Jun 2, 2026 | Philadelphia Indemnity Insurance Company | IL | 12 23 | PHLX-134967828 |
| Feb 17, 2026 | Safety National Casualty Corporation | CO | 12 23 | SFCC-134815068 |
| Jan 28, 2026 | Truck Insurance Exchange | IL | 12 23 | FARM-134815661 |
| Nov 22, 2025 | The Medical Protective Companyand 1 more | WA | 12 23 | MDPC-134692417 |
| Aug 27, 2025 | Church Mutual Insurance Company, S.I. | IL | 12 23 | CHMU-134623640 |
| Aug 14, 2025 | Church Mutual Insurance Company, S.I. | CO | 12 23 | CHMU-134605978 |
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
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