RICHFIELD, Ohio, April 27 /PRNewswire-FirstCall/ -- National Interstate Corporation (NASDAQ:NATL) will release its 2006 first quarter results on Tuesday, May 9, 2006, after the market closes. The earnings release will be available shortly thereafter on our investor relations website at http://invest.nationalinterstate.com/. (Logo: http://www.newscom.com/cgi-bin/prnh/20050114/NILOGO) In conjunction with the earnings release, our results will be discussed via conference call at 11:00 a.m. Eastern Time on Wednesday, May 10, 2006. 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 (800) 561-2731 and providing the confirmation code 57150755. Please dial in 5 to 10 minutes prior to the scheduled starting time. The conference call will also be broadcast live over the Internet. To listen to the call via the Internet, access our website at http://invest.nationalinterstate.com/ and follow the instructions at the webcast link. The archived webcast will be available immediately after the call on our website. About National Interstate Corporation National Interstate Corporation (NASDAQ:NATL), founded in 1989, completed an initial public offering in February 2005. We are a specialty property and casualty insurance company with a niche orientation and focus on the transportation industry. We differentiate ourselves within our markets by offering insurance products and services designed to meet the unique needs of targeted insurance buyers that we believe are underserved by the insurance industry. Our products include property and casualty insurance for transportation companies, captive insurance programs for commercial risks that we refer to as our alternative risk transfer component, specialty personal lines consisting primarily of recreational vehicle coverage, and transportation and general commercial insurance in Hawaii and Alaska. We offer our insurance products through multiple distribution channels including independent agents and brokers, affiliated agencies and agent Internet initiatives. Our insurance subsidiaries are rated "A" (Excellent) by A.M. Best Company. National Interstate is an independently operated subsidiary of Great American Insurance Company, a property-casualty subsidiary of American Financial Group, Inc. (NYSE:AFGNASDAQ:AFG). The Company is headquartered in Richfield, Ohio, which is located in northeastern Ohio between Cleveland and Akron. Contact: Tanya Inama National Interstate Corporation 877-837-0339 http://www.newscom.com/cgi-bin/prnh/20050114/NILOGO http://photoarchive.ap.org/ DATASOURCE: National Interstate Corporation CONTACT: Tanya Inama of National Interstate Corporation, +1-877-837-0339, or Web site: http://www.nationalinterstate.com/ http://invest.nationalinterstate.com/

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