Coverage description
An Insurance Services Office (ISO) standard form. It changes the retrospective premium endorsement so premium is computed on incurred losses six months after the policy ends and every twelve months after, with a computation becoming final only when the insurer requests it and you do not ask for another within 90 days.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 11 85Nov 1985Latest | 188 | 91 | 15 | Nov 2021 to Oct 2026 |
What the filings show
- Edition in use: in the past 12 months, 26 companies filed the 11 85 edition.
- IL 09 21 (Retrospective Premium Endorsement - Short Form) is filed alongside it most often, in 180 of the same filings (96%).
Filed under
Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Oct 2026, excluding withdrawn and rejected filings.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 IL 09 11, out of 51 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| OLD Republic Group4 group companies filed it, led by BITCO General Insurance Corporation and BITCO National Insurance Company | 13 | 1 | 11 85 | May 11, 2026 |
| Markel Corporation Group4 group companies filed it, led by State National Insurance Company, Inc. and City National Insurance Company | 12 | 5 | 11 85 | Oct 22, 2026 |
| Tokio Marine Holdings Incorporated Group2 group companies filed it, led by Safety National Casualty Corporation and Philadelphia Indemnity Insurance Company | 12 | 3 | 11 85 | Aug 27, 2026 |
| Scor GroupGeneral Security National Insurance Company | 10 | 1 | 11 85 | Jun 9, 2026 |
| Sompo Group2 group companies filed it, led by Sompo America Insurance Company and Sompo America Fire and Marine Insurance Company | 10 | 1 | 11 85 | Jun 18, 2026 |
| Siriuspoint GroupSiriusPoint America Insurance Company | 9 | 3 | 11 85 | Jun 15, 2026 |
| Clear Blue Financial Group2 group companies filed it, led by Clear Blue Insurance Company and Rock Ridge Insurance Company | 7 | 3 | 11 85 | Nov 12, 2025 |
| Nationwide Corporation Group7 group companies filed it, led by Allied Insurance Company of America and Nationwide Insurance Company of America | 7 | 4 | 11 85 | Feb 12, 2025 |
| Group 1001 Insurance Holdings GroupCLEAR SPRING PROPERTY AND CASUALTY COMPANY | 6 | 2 | 11 85 | Mar 18, 2026 |
| MS & AD Insurance Group3 group companies filed it, led by Mitsui Sumitomo Insurance Company of America and Mitsui Sumitomo Insurance USA Inc. | 6 | 3 | 11 85 | Aug 27, 2025 |
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States
Number of filings that include IL 09 11 in each state, Oct 2021 to Oct 2026. Darker states have more filings.
Often filed with
Standard-style form numbers that appear in the same filings most often.
- IL 09 21Retrospective Premium Endorsement - Short Form180 filings
- IL 09 23Retrospective Premium Endorsement - Exclusion of Retrospective Development Factors180 filings
- IL 09 19Retrospective Premium Endorsement - Three Year Plan - Multiple Lines172 filings
- IL 09 18Retrospective Premium Endorsement - One Year Plan - Multiple Lines170 filings
- IL 09 20Retrospective Premium Endorsement - Long Term Construction Project - Multiple Lines169 filings
- IL 00 21Nuclear Energy Liability Exclusion Endorsement (Broad Form)163 filings
- IL 00 03Calculation of Premium161 filings
- IL 00 17Common Policy Conditions154 filings
- IL 12 01Policy Changes138 filings
- IL 09 17Resident Agent Countersignature Endorsement127 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Oct 22, 2026 | State National Insurance Company, Inc. | CO | 11 85 | STNA-135128706 |
| Oct 6, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | CA | 11 85 | CNAB-135091690 |
| Aug 28, 2026 | Jet Insurance Company | SC | 11 85 | MRTN-134878222 |
| Aug 27, 2026 | Philadelphia Indemnity Insurance Company | NM | 11 85 | PHLX-135063316 |
| Jun 18, 2026 | Sompo America Fire and Marine Insurance Companyand 1 more | CO | 11 85 | SMPJ-134972831 |
| Jun 18, 2026 | Sompo America Insurance Company | CO | 11 85 | SMPJ-134985965 |
| Jun 17, 2026 | Atlantic Specialty Insurance Company | NM | 11 85 | BEAC-134983795 |
| Jun 17, 2026 | Atlantic Specialty Insurance Company | SC | 11 85 | BEAC-134983796 |
| Jun 17, 2026 | State Automobile Mutual Insurance Company | CO | 11 85 | STAT-134983865 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 11 85 | MRTN-134978899 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 11 85 | MRTN-134978902 |
| Jun 9, 2026 | General Security National Insurance Company | CO | 11 85 | PERR-134978283 |
Most filed ISO IL forms
- IL 00 17 Common Policy Conditions
- IL 12 01 Policy Changes
- IL 00 21 Nuclear Energy Liability Exclusion Endorsement (Broad Form)
- IL DS 00 Common Policy Declarations
- IL 09 85 Disclosure Pursuant to Terrorism Risk Insurance Act
- IL 00 03 Calculation of Premium
- IL 09 52 Cap On Losses From Certified Acts Of Terrorism
- IL 09 53 Exclusion of Certified Acts of Terrorism
- IL 09 98 Disclosure of Premium Through End of Year For Certified Acts of Terrorism Coverage (Pursuant to Terrorism Risk Insurance Act)
- IL 09 35 Exclusion of Certain Computer-Related Losses
- IL 09 99 Disclosure of Premium and Estimated Premium for Certified Acts of Terrorism Coverage (Pursuant to Terrorism Risk Insurance Act)
- IL 09 17 Resident Agent Countersignature Endorsement
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