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A.M. Best Affirms Ratings of National Interstate Corporation and Its Subsidiaries

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^{Published in Business and Finance on Thursday, June 17th 2010 at 11:55 GMT by Market Wire}  

OLDWICK, N.J.--([ BUSINESS WIRE ])--A.M. Best Co. has affirmed the financial strength rating of A (Excellent) and issuer credit ratings (ICR) of aa+a of the National Interstate Group (Richfield, OH) and its members. Concurrently, A.M. Best has affirmed the ICR of abbb+a of the groupa™s publicly traded parent, National Interstate Corporation (National Interstate) (Richfield, OH) (NASDAQ: NATL). The outlook for all ratings is stable. (See below for a detailed list of the companies.)

These rating actions reflect the groupa™s very strong operating results, excellent risk-adjusted capitalization, its leadership position in its core niche public transportation market and diverse product structure. The ratings also reflect the additional financial flexibility provided by National Interstate, which maintains modest financial leverage and very strong interest coverage ratios.

These positive rating attributes are somewhat offset by the groupa™s business concentration in the public and truck transportation industries and the inherent risk in new business, particularly growth in the groupa™s alternative risk transfer (ART) programs, which now comprise approximately 56% of its gross written premiums, as well as the risks associated with the groupa™s recently announced planned acquisition of Vanliner Group, Inc.

The outlook recognizes A.M. Besta™s expectation that the groupa™s diverse product structure and specialty focus will continue to generate positive earnings while maintaining solid risk-adjusted capital over the near term, despite increasing competitive pressures, challenging macro economic conditions and the integration risks associated with the Vanliner Group, Inc. acquisition.

The FSR of A (Excellent) and ICRs of aa+a have been affirmed for National Interstate Group and its following members:

• National Interstate Insurance Company
• National Interstate Insurance Company of Hawaii, Inc.
• Triumphe Casualty Company

For Besta™s Credit Ratings, an overview of the rating process and rating methodologies, please visit [ www.ambest.com/ratings ].

The principal methodologies used in determining these ratings, including any additional methodologies and factors that may have been considered, can be found at [ www.ambest.com/ratings/methodology ].

Founded in 1899, A.M. Best Company is a global full-service credit rating organization dedicated to serving the financial and health care service industries, including insurance companies, banks, hospitals and health care system providers. For more information, visit [ www.ambest.com ].