AM Best Upgrades Issuer Credit Rating of Berkley International Seguros México S.A.
AM Best has upgraded the Long-Term Issuer Credit Rating (Long-Term ICR) to “aa” (Superior) from “aa-” (Superior), affirmed the Financial Strength Rating (FSR) of A+ (Superior) and affirmed the Mexico National Scale Rating (NSR) of “aaa.MX” (Exceptional) of Berkley International Seguros México S.A. (BISM) (
BISM is a member of
The Long-Term ICR upgrade reflects Berkley Group’s improved balance sheet strength fundamentals, driven by a robust investment portfolio that is driving consistently strong returns, consistent organic surplus growth over the most recent 10-year period and the group’s strong debt leverage.
The stable outlooks reflect AM Best’s expectation that the group will maintain its balance sheet strength assessment in the strongest range over the intermediate term with strong operating results contributing to surplus growth.
The Credit Ratings (ratings) reflect BISM’s substantial reinsurance support from its group through
BISM was formed in
BISM’s strongest level of risk-adjusted capitalization, as measured by Best’s Capital Adequacy Ratio (BCAR), is derived from its sound capital position, further strengthened by the 95/5 percent quota share and excess of loss contracts provided by BIC. Furthermore, AM Best recognizes
BISM has been able to grow its business volume during the past nine years. Management and underwriting teams have navigated changes in the market’s economic dynamics successfully in recent years. The company continues to take advantage of the reinsurance support received from
Negative rating actions could occur to BISM if the balance sheet strength of the ultimate parent materially deteriorates, including a decline in risk-adjusted capitalization enough to warrant a less favorable balance sheet assessment.
While considered unlikely, positive rating actions could be taken if the ultimate parent’s operating performance metrics continue to show a favorable trend and align more closely with a very strong operating performance assessment. BISM ratings would mirror those actions.
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 © 2026 by A.M. Best Rating Services, Inc. and/or its affiliates. ALL RIGHTS RESERVED.
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Source: AM Best


AM Best Upgrades Issuer Credit Ratings of W. R. Berkley Corporation and Its Subsidiaries
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