RICHFIELD, Ohio, July 21, 2010 (GLOBE NEWSWIRE) -- National Interstate Corporation (Nasdaq:NATL) announced today that the Company will release its 2010 second quarter results after the market closes on Tuesday, August 3, 2010. The earnings release will be available shortly thereafter on the Company's investor relations website at http://invest.natl.com . In conjunction with the earnings release, second quarter results will be discussed via conference call at 10:00 a.m. Eastern Daylight Saving Time on Wednesday, August 4, 2010. 

In regard to the earnings conference call, there are two communication modes available to listen to the call. Telephone access to the conference call and Q and A session will be available by dialing (888) 679-8035 and providing the confirmation code 98055123. Please dial in 5 to 10 minutes prior to the scheduled starting time. To pre-register for the conference call, go to https://www.theconferencingservice.com/prereg/key.process?key=PUKB7WR9Q and follow the instructions provided. The conference call will be broadcast live over the Internet. To listen to the call via the Internet or to access the archived web cast, access the Company's investor relations website at http://invest.natl.com and follow the instructions at the web cast link.

About National Interstate Corporation

National Interstate Corporation (Nasdaq:NATL), founded in 1989, is the holding company for a specialty property-casualty insurance group which differentiates itself by offering products and services designed to meet the unique needs of niche markets. Products include insurance for passenger, truck and moving and storage transportation companies, alternative risk transfer, or captive programs for commercial risks, specialty personal lines products focused primarily on recreational vehicle owners and small commercial vehicle accounts, and transportation and general commercial insurance in Hawaii and Alaska. Products are offered through multiple distribution channels including independent agents and brokers, affiliated agencies and agent Internet initiatives. The Company's insurance subsidiaries, including the two primary insurers, National Interstate Insurance Company and Vanliner Insurance Company, are rated "A" (Excellent) by A.M. Best Company. Headquartered in Richfield, Ohio, National Interstate is an independently operated subsidiary of Great American Insurance Company, a property-casualty subsidiary of American Financial Group, Inc. (NYSE:AFG) (Nasdaq:AFG).
CONTACT:  National Interstate Corporation          Tanya Inama          877-837-0339          investorrelations@natl.com          www.natl.com