Coverage description
An Insurance Services Office (ISO) standard form. It excludes umbrella coverage for bodily injury, property damage and personal and advertising injury arising from silica or silica-related dust, plus the cost of testing, cleaning up or responding to it.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 03 05Mar 2005Latest | 53 | 43 | 9 | May 2022 to Aug 2026 |
Filed by one company only: 03 26 (Pekin Insurance Group, 5 filings).
1 other edition date appears in one or two filings each, often carrier-specific versions: 03 04.
What the filings show
- Edition in use: in the past 12 months, 15 companies filed the 03 05 edition and 1 company filed 03 26.
- The 03 26 edition appears only in filings from Pekin Insurance Group (5 filings in 5 states since Aug 3, 2026), which suggests a carrier-specific version.
- CU 21 23 (Nuclear Energy Liability Exclusion Endorsement) is filed alongside it most often, in 53 of the same filings (88%).
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Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Aug 2026, excluding withdrawn and rejected filings.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 50, out of 29 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Tokio Marine Holdings Incorporated Group2 group companies filed it, led by Safety National Casualty Corporation and Philadelphia Indemnity Insurance Company | 7 | 3 | 03 05 | Aug 11, 2026 |
| Church Mutual GroupChurch Mutual Insurance Company, S.I. | 5 | 2 | 03 05 | Jun 26, 2026 |
| Pekin Insurance GroupPekin Insurance Company | 5 | 5 | 03 26 | Aug 3, 2026 |
| Sompo GroupSompo America Insurance Company | 5 | 1 | 03 05 | Jun 15, 2026 |
| James River GroupFalls Lake National Insurance Company | 4 | 4 | 03 0403 05 | Jan 13, 2023 |
| AU Holding Company GroupContinental Indemnity Company | 3 | 3 | 03 05 | May 3, 2024 |
| Nationwide Corporation Group3 group companies filed it, led by National Casualty Company and Nationwide Agribusiness Insurance Company | 3 | 2 | 03 05 | May 7, 2025 |
| Ally Insurance Holdings GroupMotors Insurance Corporation | 2 | 2 | 03 05 | Mar 19, 2024 |
| American European Group2 group companies filed it, led by American European Insurance Company and Rutgers Casualty Ins Co | 2 | 2 | 03 05 | Apr 17, 2023 |
| American Family Insurance GroupMidvale Indemnity Company | 2 | 2 | 03 05 | Sep 28, 2023 |
How the largest insurers handle CU 21 50
Groups among the largest commercial umbrella and excess insurers that filed CU 21 50 or their own version in the past five years.
- Chubb Limited GroupUses CU 21 50 in 1 filing
- Travelers GroupFiles its own version: XP 01 8109 25 Silica Or Silica-Related Dust Exclusion (34 states)
- Berkshire Hathaway GroupUses CU 21 50 in 1 filing
- Fairfax Financial GroupUses CU 21 50 in 1 filing
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States
Number of filings that include CU 21 50 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 23Nuclear Energy Liability Exclusion Endorsement53 filings
- CU 21 00Exclusion - All Hazards in Connection with Designated Premises51 filings
- CU 21 43Exclusion - Designated Products51 filings
- CU 21 16Exclusion - Designated Ongoing Operations50 filings
- CU 21 27Fungi or Bacteria Exclusion50 filings
- CU 22 61Exclusion - Damage to Work Performed by Sub-Contractors on Your Behalf - Designated Sites or Operations50 filings
- CU 00 01Commercial Liability Umbrella Coverage Form49 filings
- CU 21 03Exclusion - Designated Work49 filings
- CU 21 07Contractual Liability Limitation49 filings
- CU 21 09Exclusion - Explosion, Collapse and Underground Property Damage Hazard (Specified Operations)49 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 | 03 05 | MRTN-134978915 |
| Aug 11, 2026 | Philadelphia Indemnity Insurance Company | SC | 03 05 | PHLX-135041545 |
| Aug 3, 2026 | Pekin Insurance Company | IL | 03 26 | PKNS-135042257 |
| Aug 3, 2026 | Pekin Insurance Company | IN | 03 26 | PKNS-135042258 |
| Aug 3, 2026 | Pekin Insurance Company | IA | 03 26 | PKNS-135042259 |
| Aug 3, 2026 | Pekin Insurance Company | OH | 03 26 | PKNS-135042260 |
| Aug 3, 2026 | Pekin Insurance Company | WI | 03 26 | PKNS-135042262 |
| Jul 2, 2026 | Zenith Insurance Company | CA | 03 05 | ZICO-134998423 |
| Jun 30, 2026 | The Medical Protective Companyand 1 more | IL | 03 05 | MDPC-135002488 |
| Jun 26, 2026 | Church Mutual Insurance Company, S.I. | CO | 03 05 | CHMU-134995025 |
| Jun 24, 2026 | CopperPoint Casualty Insurance Companyand 1 more | SC | 03 05 | COPP-134996381 |
| Jun 19, 2026 | Addison Insurance Companyand 1 more | CO | 03 05 | UNFG-134979875 |
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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