AM Best Affirms Credit Ratings of Factory Mutual Insurance Company and Its Subsidiaries
AM Best has affirmed the Financial Strength Rating (FSR) of A+ (Superior) and the Long-Term Issuer Credit Ratings (Long-Term ICRs) of “aa” (Superior) of
The ratings reflect FM Group’s balance sheet strength, which AM Best assesses as strongest, as well as its strong operating performance, favorable business profile and appropriate enterprise risk management (ERM).
The stable outlooks reflect AM Best’s expectation that FM Group’s risk-adjusted capitalization and operating performance will continue to exhibit excellent trends. AM Best expects that the group’s ERM practices will continue to drive commensurately strong returns in its niche business model. FM Group’s high-risk tolerance periodically results in volatile underwriting performance due to catastrophe events that management has successfully navigated over the organization’s long history.
Positive rating action may occur with manageable volatility reflected in FM Group’s historically superior underwriting results, warranting a more favorable assessment in the group’s operating performance or ERM.
Negative rating action may occur if risk-based capitalization is materially weakened by deteriorating non-catastrophe underwriting trends or following a prolonged equity market downturn. In addition, negative rating action could result if operating performance erodes materially for an extended period relative to its strong assessment.
The FSR of A+ (Superior) and the Long-Term ICRs of “aa” (Superior) have been affirmed with stable outlooks for
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Affiliated FM Insurance Company -
Appalachian Insurance Company -
FM Insurance Europe S.A.
This press release relates to Credit Ratings that have been published on AM Best’s website. For all rating information relating to the release and pertinent disclosures, including details of the office responsible for issuing each of the individual ratings referenced in this release, please see AM Best’s Recent Rating Activity web page. For additional information regarding the use and limitations of Credit Rating opinions, please view Guide to Best's Credit Ratings. For information on the proper use of Best’s Credit Ratings, Best’s Performance Assessments, Best’s Preliminary Credit Assessments and AM Best press releases, please view Guide to Proper Use of Best’s Ratings & Assessments.
AM Best is a global credit rating agency, news publisher and data analytics provider specializing in the insurance industry. Headquartered in
Copyright © 2025 by A.M. Best Rating Services, Inc. and/or its affiliates. ALL RIGHTS RESERVED.
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Source: AM Best


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