Who writes inland marine in Wisconsin
Top insurer groups from the NAIC market share report; the state's list carries no lines of authority.
Liberty Mutual Group wrote the most inland marine in Wisconsin in 2025, $55.9M and 9.7% of the state's premium; the top five groups hold 32%. Wisconsin's company list doesn't say which lines each company is licensed for, so the ranking below is the NAIC's top 10 groups; every licensed company is on the Wisconsin page.
By Sam Alishahi, independent insurance broker · All lines in Wisconsin
Method and source
Source: the Wisconsin insurance regulator company list, read 2026-10-18. Admitted = union of two OCI 2025 Wisconsin Insurance Report documents joined by normalized name: Table E market share (every insurer with 2025 WI premium, all 48 lines incl. life/annuity/A&H; gives NAIC code + lines) and the Directory of Licensed Insurers as of 12/31/2025 (gives domicile, company type, year commenced in WI; no NAIC; https://oci.wi.gov/Documents/AboutOCI/2025_WIR_Directory.pdf). Join stats: {'exact': 1249, 'fuzzy': 3, 'unmatched_xlsx': 2, 'directory_rows': 2281, 'table_e_naic': 1254, 'directory_unmatched': 1029}. Rows with naic '' are directory-only (licensed but no 2025 WI premium or name not matched); rows with type '' are Table E only (name not matched to the directory). Type codes: AR=Accredited Reinsurer; CR=Certified Reinsurer; RJR=Reciprocal Jurisdiction Reinsurer; DSL=Domestic Surplus Line; FR=Fraternal Benefit Society; CC=Continuing Care Organization; CMO=Care Management Organization; HMO=Health Maintenance Organization; IRO=Independent Review Organization; LAH=Life and Accident and Health Company; LSP=Life Settlement Provider; RRG=Risk Retention Group; LSHO=Limited Service Health Organization; MC=Motor Club Plan; SCP=Service Contract Provider; PC=Property and Casualty Company; TI=Title Company; TM=Town Mutual of Wisconsin; VPP=Vehicle Protection Plan; WP=Warranty Plan. Filter P&C with type in {PC, RRG, DSL, TM, TI} or lines among the P&C lines (Table E sheets 34-48: FIRE, FARMOWNERS MULTIPLE PERIL, HOMEOWNERS MULTIPLE PERIL, COMMERCIAL MULTIPLE PERIL, MEDICAL MALPRACTICE, WORKERS COMPENSATION, EXCESS WORKERS COMPENSATION, OTHER LIABILITY, PRIVATE PASSENGER AUTO, COMMERCIAL AUTO, FIDELITY, SURETY, CREDIT, MORTGAGE GUARANTY, TITLE; sheet 33 STOP LOSS/EXCESS LOSS; line strings are the sheet titles, which differ slightly from the TOC). Directory also lists non-insurers (SCP, WP, VPP, MC, LSP, IRO, CC, CMO) and reinsurers (AR, CR, RJR); foreign domiciles are blanked. 'since' = year commenced business in WI. Wisconsin publishes no eligible surplus lines list (NRRA home-state rule; NAIC IID list for aliens), so surplus_lines is empty. "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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