Coverage description
An Insurance Services Office (ISO) standard form. Retrospective rating plan for a long term construction project that calculates the final premium for the listed policies and renewals over the duration of the project from basic premium, converted losses, taxes and optional loss limitation and development charges.
How the form has changed
The 10 93 edition revises premium factor wording and rating calculation details. It does not change the coverage provided.
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 10 93Oct 1993Latest | 189 | 98 | 17 | Nov 2021 to Oct 2026 |
| 04 84Apr 1984 | 4 | 7 | 2 | Dec 2021 to Jun 2026 |
1 other edition date appears in one or two filings each, often carrier-specific versions: 10 23.
What the filings show
- Edition in use: in the past 12 months, 27 companies filed the 10 93 edition and 1 company filed 04 84.
- IL 09 19 (Retrospective Premium Endorsement - Three Year Plan - Multiple Lines) is filed alongside it most often, in 193 of the same filings (100%).
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Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Oct 2026, excluding withdrawn and rejected filings.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 20, out of 53 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 | 10 93 | May 11, 2026 |
| Tokio Marine Holdings Incorporated Group4 group companies filed it, led by Safety National Casualty Corporation and TNUS Insurance Company | 13 | 3 | 10 93 | Feb 17, 2026 |
| Markel Corporation Group4 group companies filed it, led by State National Insurance Company, Inc. and City National Insurance Company | 12 | 5 | 10 93 | Oct 22, 2026 |
| Sompo Group2 group companies filed it, led by Sompo America Insurance Company and Sompo America Fire and Marine Insurance Company | 12 | 2 | 10 93 | Jun 18, 2026 |
| Scor GroupGeneral Security National Insurance Company | 10 | 1 | 10 93 | Jun 9, 2026 |
| Siriuspoint GroupSiriusPoint America Insurance Company | 9 | 3 | 10 93 | Jun 15, 2026 |
| Group 1001 Insurance Holdings GroupCLEAR SPRING PROPERTY AND CASUALTY COMPANY | 7 | 2 | 10 93 | Mar 18, 2026 |
| Nationwide Corporation Group7 group companies filed it, led by Allied Insurance Company of America and Nationwide Agribusiness Insurance Company | 6 | 3 | 10 93 | Feb 12, 2025 |
| Alliance Insurance GroupFarmers Alliance Mutual Insurance Company | 5 | 1 | 10 93 | May 19, 2026 |
| Ambac Financial GroupEverspan Insurance Company | 5 | 4 | 10 93 | Apr 28, 2025 |
See more forms
Search related forms, compare editions, and research carrier filings with FilingFocus.
States
Number of filings that include IL 09 20 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 19Retrospective Premium Endorsement - Three Year Plan - Multiple Lines193 filings
- IL 09 18Retrospective Premium Endorsement - One Year Plan - Multiple Lines191 filings
- IL 09 21Retrospective Premium Endorsement - Short Form174 filings
- IL 09 23Retrospective Premium Endorsement - Exclusion of Retrospective Development Factors174 filings
- IL 00 21Nuclear Energy Liability Exclusion Endorsement (Broad Form)169 filings
- IL 09 11Supplement to Retrospective Premium Endorsement (Final Premium Computation)169 filings
- IL 00 03Calculation of Premium164 filings
- IL 00 17Common Policy Conditions158 filings
- IL 12 01Policy Changes126 filings
- IL 09 17Resident Agent Countersignature Endorsement117 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 | 10 93 | STNA-135128706 |
| Oct 6, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | CA | 10 93 | CNAB-135091690 |
| Sep 4, 2026 | Southern Trust Insurance Company | GA | 10 93 | STTR-135079411 |
| Aug 28, 2026 | Jet Insurance Company | SC | 10 93 | MRTN-134878222 |
| Jun 18, 2026 | Atlantic Specialty Insurance Company | SC | 10 93 | BEAC-134983501 |
| Jun 18, 2026 | Sompo America Fire and Marine Insurance Companyand 1 more | CO | 10 93 | SMPJ-134972831 |
| Jun 18, 2026 | Sompo America Insurance Company | CO | 10 93 | SMPJ-134985965 |
| Jun 17, 2026 | Atlantic Specialty Insurance Company | NM | 10 9304 84 | BEAC-134983795 |
| Jun 17, 2026 | Atlantic Specialty Insurance Company | SC | 10 93 | BEAC-134983796 |
| Jun 17, 2026 | State Automobile Mutual Insurance Company | CO | 10 93 | STAT-134983865 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 10 93 | MRTN-134978899 |
| Jun 15, 2026 | SiriusPoint America Insurance Company | CO | 10 93 | MRTN-134978902 |
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
See more carrier forms
Search forms by carrier, line of business, state, and wording with FilingFocus.