UNDERWRITING AGREEMENT 600,000 Shares of Common Stock, par value $0.01 per share NATIONAL INTERSTATE CORPORATION, THE SELLING SHAREHOLDER and KEYBANC CAPITAL MARKETS INC. September 6, 2007Underwriting Agreement • September 7th, 2007 • National Interstate CORP • Fire, marine & casualty insurance • Ohio
This Lock-Up Letter Agreement is being delivered to you in connection with the proposed Underwriting Agreement (the “Underwriting Agreement”) to be entered into by National Interstate Corporation, an Ohio corporation (the “Company”), a selling shareholder of the Company (the “Selling Shareholder”) and you, with respect to the public offering by the Selling Shareholder (the “Offering”) of Common Stock, par value $0.01 per share, of the Company (the “Common Stock”).
