Coverage description
An Insurance Services Office (ISO) standard form. It makes the lessee named in the schedule an insured for covered autos you own or hire and lease to it in writing under a hold harmless agreement, with your liability coverage primary for the lessee and 30 days' notice to the lessee of cancellation or reduced limits.
How the form has changed
The 10 13 edition renames the endorsement and the liability coverage and updates the coverage forms it applies to. The coverage wording is the same as 12 93.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 10 13Oct 2013Latest | 172 | 96 | 14 | Dec 2021 to Aug 2026 |
| 12 93Dec 1993 | 7 | 6 | 4 | Jun 2022 to Jun 2025 |
1 other edition date appears in one or two filings each, often carrier-specific versions: 12 19.
What the filings show
- Edition in use: in the past 12 months, 42 companies filed the 10 13 edition.
- CA 99 44 (Loss Payable Clause) is filed alongside it most often, in 176 of the same filings (97%).
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Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Aug 2026, excluding withdrawn and rejected filings.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 CA 23 12, out of 51 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Nationwide Corporation Group11 group companies filed it, led by Allied Insurance Company of America and Nationwide Mutual Insurance Company | 15 | 6 | 10 13 | Apr 7, 2026 |
| Arch Insurance Group3 group companies filed it, led by Arch Indemnity Insurance Company and Arch Insurance Company | 14 | 2 | 10 13 | Apr 8, 2026 |
| OLD Republic Group4 group companies filed it, led by BITCO General Insurance Corporation and BITCO National Insurance Company | 13 | 1 | 10 13 | May 11, 2026 |
| Scor GroupGeneral Security National Insurance Company | 10 | 1 | 10 13 | Jun 9, 2026 |
| Markel Corporation Group3 group companies filed it, led by State National Insurance Company, Inc. and Markel Insurance Company | 8 | 4 | 10 13 | Jun 24, 2024 |
| MS & AD Insurance Group3 group companies filed it, led by Mitsui Sumitomo Insurance Company of America and Mitsui Sumitomo Insurance USA Inc. | 7 | 4 | 10 13 | Sep 4, 2025 |
| Ambac Financial GroupEverspan Insurance Company | 6 | 4 | 10 13 | Apr 28, 2025 |
| American Financial Group7 group companies filed it, led by Great American Alliance Insurance Company and Great American Assurance Company | 6 | 4 | 10 13 | Jun 24, 2026 |
| Group 1001 Insurance Holdings GroupCLEAR SPRING PROPERTY AND CASUALTY COMPANY | 6 | 2 | 10 13 | Mar 18, 2026 |
| Selective Insurance Group4 group companies filed it, led by Selective Way Insurance Company and Selective Insurance Company of America | 6 | 2 | 10 13 | Jun 25, 2026 |
How the largest insurers handle CA 23 12
Groups among the largest commercial auto insurers that filed CA 23 12 or their own version in the past five years.
- Progressive GroupUses CA 23 12 in 1 filing
- Travelers GroupUses CA 23 12 in 63 filings
See more forms
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States
Number of filings that include CA 23 12 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.
- CA 99 44Loss Payable Clause176 filings
- CA 99 16Hired Autos Specified as Covered Autos You Own175 filings
- CA 99 23Rental Reimbursement Coverage175 filings
- CA 99 47Employee as Lessor175 filings
- CA 23 98Trailer Interchange Coverage174 filings
- CA 20 27Registration Plates Not Issued for a Specific Auto173 filings
- CA 23 09Motor Carriers - Insurance for Non- Trucking Use173 filings
- CA 99 33Employees as Insureds173 filings
- CA 99 40Exclusion or Excess Coverage Hazards Otherwise Insured173 filings
- CA 04 44Waiver of Transfer of Rights of Recovery Against Others to Us (Waiver of Subrogation)172 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Aug 28, 2026 | Jet Insurance Company | SC | 10 13 | MRTN-134878222 |
| Jun 26, 2026 | Grange Insurance Association | CO | 10 13 | GRIA-135000193 |
| Jun 25, 2026 | Selective Insurance Company of Americaand 3 more | CO | 10 13 | SELC-134998854 |
| Jun 24, 2026 | Great American Alliance Insurance Companyand 3 more | CO | 10 13 | GACX-134993563 |
| Jun 19, 2026 | Addison Insurance Companyand 1 more | CO | 10 13 | UNFG-134905846 |
| Jun 18, 2026 | Atlantic Specialty Insurance Company | SC | 10 13 | BEAC-134983501 |
| Jun 18, 2026 | Sompo America Fire and Marine Insurance Companyand 1 more | CO | 10 13 | SMPJ-134972831 |
| Jun 17, 2026 | State Automobile Mutual Insurance Company | CO | 10 13 | STAT-134983865 |
| Jun 9, 2026 | General Security National Insurance Company | CO | 10 13 | PERR-134978283 |
| Jun 9, 2026 | General Security National Insurance Company | CO | 10 13 | PERR-134978297 |
| Jun 5, 2026 | Incline Casualty Company | SC | 10 13 | MRTN-134969595 |
| May 21, 2026 | Jet Insurance Company | NM | 10 13 | MRTN-134878221 |
Most filed ISO CA forms
- CA DS 03 Business Auto Declarations
- CA DS 21 Motor Carrier Declarations
- CA 00 01 Business Auto Coverage Form
- CA 28 03 Abuse Or Molestation Exclusion For Covered Autos Liability Exposure
- CA 23 17 Truckers - Uniform Intermodal Interchange Endorsement Form UIIE - 1
- CA 04 43 Waiver Of Transfer Of Rights Of Recovery Against Others To Us (Waiver Of Subrogation) - Automatic When Required By Written Contract Or Agreement
- CA 04 44 Waiver Of Transfer Of Rights Of Recovery Against Others To Us (Waiver Of Subrogation)
- CA 04 49 Primary and Noncontributory - Other Insurance Condition
- CA 20 01 Lessor - Additional Insured And Loss Payee
- CA 20 48 Designated Insured For Covered Autos Liability Coverage
- CA 00 20 Motor Carrier Coverage Form
- CA 20 71 Auto Loan/Lease Gap Coverage
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