Who writes warranty in Washington
The 19 largest writers by premium in 2025 from the Washington Office of the Insurance Commissioner and the Surplus Line Association of Washington market report (a top-19 list, shares of earned premium).
The 19 largest writers of warranty in Washington in 2025: Wesco Insurance Company led with 32.0% of the state's premium; the top five hold 89%.
By Sam Alishahi, independent insurance broker · All lines in Washington
The companies
| # | Company | NAIC | Home state | Status here | Premium | Share |
|---|---|---|---|---|---|---|
| 1 | Wesco Insurance Company | 25011 | DE | Admitted (licensed) | $51.9M | 32.04% |
| 2 | Dealers Assurance Company | 16705 | OH | Admitted (licensed) | $31.8M | 19.60% |
| 3 | PROTECTIVE PROPERTY \u0026 CASUALTY INSURANCE COMPANY | 35769 | MO | Admitted (licensed) | $25.6M | 15.80% |
| 4 | Universal Underwriters Insurance Company | 41181 | IL | Admitted (licensed) | $22.0M | 13.55% |
| 5 | Old Republic Insurance Company | 24147 | PA | Admitted (licensed) | $13.4M | 8.27% |
| 6 | Continental Insurance Company, (The) | 35289 | PA | Admitted (licensed) | $9.4M | 5.80% |
| 7 | Lyndon Southern Insurance Company | 10051 | DE | Admitted (licensed) | $5.9M | 3.62% |
| 8 | American Bankers Insurance Company of Florida | 10111 | FL | Admitted (licensed) | $738,000 | 0.46% |
| 9 | Continental Casualty Company | 20443 | IL | Admitted (licensed) | $484,000 | 0.30% |
| 10 | MIC Property and Casualty Insurance Corporation | 38601 | MI | Admitted (licensed) | $327,000 | 0.20% |
| 11 | STARR INDEMNITY \u0026 LIABILITY COMPANY | 38318 | TX | Admitted (licensed) | $251,000 | 0.15% |
| 12 | National Casualty Company | 11991 | OH | Admitted (licensed) | $114,000 | 0.07% |
| 13 | Lexington National Insurance Corporation | 37940 | FL | Admitted (licensed) | $76,000 | 0.05% |
| 14 | Heritage Indemnity Company | 39527 | CA | Admitted (licensed) | $75,000 | 0.05% |
| 15 | Courtesy Insurance Company | 26492 | FL | Admitted (licensed) | $40,000 | 0.02% |
| 16 | American Mercury Insurance Company | 16810 | OK | Admitted (licensed) | $12,000 | 0.01% |
| 17 | New Hampshire Insurance Company | 23841 | IL | Admitted (licensed) | $7,000 | 0.00% |
| 18 | Continental Indemnity Company | 28258 | NM | Admitted (licensed) | $4,000 | 0.00% |
| 19 | American Road Insurance Company (The) | 19631 | MI | Admitted (licensed) | $2,000 | 0.00% |
Method and source
Source: the Washington Office of the Insurance Commissioner and the Surplus Line Association of Washington company list, read 2026-10-17 and the surplus lines list. Washington's authorized list comes from the OIC's 2025 market report (Appendix D), which leaves out authorized companies with no premium that year. Premiums are in thousands. "Premium" is direct premium written in the state for the year shown; "share" is that company's part of the state total for the line. A company can be licensed for a line and write none of it, and a surplus lines insurer can write a line without a state license for it.
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