Coverage description
A National Council on Compensation Insurance (NCCI) standard form. It removes the premium and incurred losses of the aviation classifications listed in its Schedule from the retrospective rating plan on the policy.
Updated
What the form says
Key clauses from the original edition, which has not been revised, quoted as filed.
“Premium and incurred losses arising out of an aviation classification listed in the Schedule are excluded from retrospective rating.”
WC 00 05 08
What is taken out of the retrospective plan. Both the premium and the losses of the scheduled aviation classifications are left out of the retrospective calculation, so the loss-sensitive adjustment applies only to the policy's other classifications.
“is effective on the date issued unless otherwise stated”
WC 00 05 08
When the exclusion starts. Added after the policy is written, the exclusion applies from the date the endorsement is issued unless another date is entered.
How the form has changed
Filed copies carry the original 4-84 edition, with no revision letter.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed | Document |
|---|---|---|---|---|---|
| OriginalLatest | 95 | 68 | 11 | Jan 2022 to Aug 2026 | View PDF |
What the filings show
- Edition in use: in the past 12 months, 34 companies filed the original edition.
- WC 00 03 04 (Insurance Company as Insured Endorsement) is filed alongside it most often, in 94 of the same filings (99%).
Filed under
Data from admitted P&C filings with state insurance departments, submitted Nov 2021 to Aug 2026, excluding withdrawn and rejected filings.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 WC 00 05 08, out of 23 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Brookfield Wealth Solutions Group4 group companies filed it, led by Argonaut Insurance Company and Argonaut-Midwest Insurance Company | 19 | 1 | Original | Jun 4, 2026 |
| Nationwide Corporation Group3 group companies filed it, led by Crestbrook Insurance Company and National Casualty Company | 10 | 1 | Original | Jun 30, 2026 |
| AXA Insurance Group5 group companies filed it, led by Greenwich Insurance Company and XL Insurance America, Inc. | 6 | 2 | Original | Jun 23, 2026 |
| Acuity, A Mutual Insurance Company | 6 | 2 | Original | Jul 1, 2026 |
| Tokio Marine Holdings Incorporated Group2 group companies filed it, led by Safety First Insurance Company and Safety National Casualty Corporation | 6 | 2 | Original | May 14, 2025 |
| RLI Insurance GroupRLI Insurance Company | 5 | 1 | Original | Aug 18, 2026 |
| Sompo Group2 group companies filed it, led by Sompo America Fire and Marine Insurance Company and Sompo America Insurance Company | 5 | 1 | Original | Jun 15, 2026 |
| THE Hanover Insurance Group6 group companies filed it, led by Allmerica Financial Alliance Insurance Company and Allmerica Financial Benefit Insurance Company | 5 | 1 | Original | Jun 23, 2026 |
| Arch Insurance Group2 group companies filed it, led by Arch Indemnity Insurance Company and Arch Insurance Company | 4 | 1 | Original | Apr 8, 2026 |
| Copperpoint Group4 group companies filed it, led by CopperPoint Premier Insurance Company and Alaska National Insurance Company | 4 | 2 | Original | May 27, 2026 |
How the largest insurers handle WC 00 05 08
Groups among the largest workers compensation insurers that filed WC 00 05 08 or their own version in the past five years.
- Amtrust Financial Services GroupUses WC 00 05 08 in 1 filing
States
Number of filings that include WC 00 05 08 in each state, Nov 2021 to Aug 2026. Darker states have more filings.
Often filed with
Standard-style form numbers that appear in the same filings most often.
- WC 00 03 04Insurance Company as Insured Endorsement94 filings
- WC 00 03 05Joint Venture as Insured Endorsement94 filings
- WC 00 01 06Longshoremen's and Harbor Workers' Compensation Act Coverage Endorsement93 filings
- WC 00 03 15Domestic and Agricultural Workers Exclusion Endorsement93 filings
- WC 00 03 01Alternate Employer Endorsement92 filings
- WC 00 03 08Partners, Officers and Others Exclusion Endorsement92 filings
- WC 00 04 06Premium Discount Endorsement92 filings
- WC 00 03 13Waiver of Our Right to Recover From Others Endorsement91 filings
- WC 00 00 01Information Page90 filings
- WC 00 03 02Designated Workplaces Exclusion Endorsement90 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Aug 18, 2026 | RLI Insurance Company | CO | Original | RLSC-135057018 |
| Jul 1, 2026 | Acuity, A Mutual Insurance Company | CO | Original | ACUT-134982793 |
| Jun 30, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | CO | Original | CNAB-135003197 |
| Jun 30, 2026 | Crestbrook Insurance Companyand 1 more | CO | Original | NWPP-135003409 |
| Jun 30, 2026 | National Casualty Company | CO | Original | NWPP-135004216 |
| Jun 23, 2026 | Allmerica Financial Alliance Insurance Companyand 5 more | CO | Original | HNVX-134968029 |
| Jun 23, 2026 | AXA XL Insurance Company Americasand 3 more | CO | Original | XLAM-134996276 |
| Jun 15, 2026 | Sompo America Fire and Marine Insurance Companyand 1 more | CO | Original | SMPJ-134970923 |
| Jun 4, 2026 | Argonaut-Midwest Insurance Company | CO | Original | ARGN-134974739 |
| Jun 4, 2026 | Argonaut Insurance Company | CO | Original | ARGN-134974742 |
| Jun 4, 2026 | Rockwood Casualty Insurance Company | CO | Original | ARGN-134974764 |
| May 27, 2026 | Alaska National Insurance Company | SC | Original | ALNI-134962436 |
Most filed NCCI WC forms
- WC 00 00 01 Information Page
- WC 00 04 19 Part Five, Premium Amendatory Endorsement
- WC 00 00 00 Workers Compensation and Employers Liability Insurance Policy
- WC 00 04 21 Catastrophe (Other Than Certified Acts of Terrorism) Premium Endorsement
- WC 00 04 06 Premium Discount Endorsement
- WC 00 03 13 Waiver of Our Right to Recover From Others Endorsement
- WC 00 04 22 Terrorism Risk Insurance Program Reauthorization Act Disclosure Endorsement
- WC 00 03 08 Partners, Officers and Others Exclusion Endorsement
- WC 00 03 03 Employers Liability Coverage Endorsement
- WC 00 03 11 Voluntary Compensation and Employers Liability Coverage Endorsement
- WC 00 04 03 Experience Rating Modification Factor Endorsement
- WC 00 04 04 Pending Rate Change Endorsement