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Directory · Massachusetts · Financial guaranty

Who writes financial guaranty in Massachusetts

Top insurer groups from the NAIC market share report; the state's list carries no lines of authority.

Assured Guar Inc wrote the most financial guaranty in Massachusetts in 2025, $3.4M and 87.3% of the state's premium; the top five groups hold 100%. Massachusetts'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 Massachusetts page.

By Sam Alishahi, independent insurance broker · All lines in Massachusetts

Top 10 · NAIC table: 10 - Financial Guaranty

The insurer groups that write the most financial guaranty in Massachusetts

Top 10 insurer groups by direct premium written in 2025, from the NAIC's Market Share Reports for Property/Casualty Groups and Companies by State. A group is the parent and its insurance companies together; share is the group's part of the state total for the line; loss ratio is losses incurred over premium earned.

#Insurer groupPremium writtenShareLoss ratioMember companies here
1Assured Guaranty Inc.$3.4M87.28%——
2Ambac Assurance Corporation$492,00012.72%283%—
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Last resort for financial guaranty in Massachusetts

Last resortLinesWhereHow to get in
Surplus lines and Lloyd's open marketallall states, under each state's diligent-search rulesThrough surplus lines wholesalers; commercial property and liability have no guaranteed plan, so this is their last stepSource

Method and source

Source: the Massachusetts insurance regulator company list, read 2026-10-18 and the surplus lines list. MA Division of Insurance 'Licensed Or Approved Companies' workbook dated October 1, 2026 (sheet XLSX_Approved_Worksheet, 2717 rows across 23 company types). admitted = licensed insurers only: types Property & Casualty, Life, Accident & Health, Title, Fraternal, Health Maintenance Organization, Hospital (M&D) Service Plan (850 Property & Casualty; filter on type). Left out: TPAs, risk purchasing groups, risk retention groups, accredited/certified/reciprocal reinsurers, PBMs, service contract providers and other non-insurer registrants. The master file carries no domicile, lines of authority or license date; its State column is the mailing address, not domicile. domicile is 'MA' only for companies on the DOI's Domestic P&C list, else blank. lines come from the DOI's per-designation lists (Auto Liability 6G, Workers' Compensation 6E, Fidelity & Surety 4G) and are partial: a P&C company with no lines here may still hold other designations. surplus_lines = company types 'Surplus Lines' and 'Reinsurer/Surplus Lines'; eligible date not published; alien inferred (Lloyd's of London or non-US address) since the file gives no domicile. Source list page: https://www.mass.gov/lists/massachusetts-licensed-insurance-companies. "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.

Open to use. Cite "Alishahi Insurance insurance company directory" and link here. CSV · JSON.

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