TomoTherapy Incorporated Files Registration Statement for Proposed Initial Public Offering

Business Wire, Feb 12, 2007

MADISON, Wis. -- TomoTherapy Incorporated announced today that it has filed a registration statement on Form S-1 with the Securities and Exchange Commission relating to a proposed initial public offering of shares of its common stock. The number of shares to be offered and the price range for the offering have not yet been determined. The shares of common stock to be sold in this offering are proposed to be sold by TomoTherapy Incorporated and certain shareholders.

Merrill Lynch & Co. is acting as the sole book-running manager, with Piper Jaffray & Co. as co-lead manager, and Thomas Weisel Partners LLC as co-manager for the offering. The offering will be made only by means of a prospectus. When available, a copy of the preliminary prospectus related to the offering may be obtained from: Merrill Lynch & Co., 4 World Financial Center, New York, NY 10080.

A registration statement relating to these securities has been filed with the SEC but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state.

About TomoTherapy Incorporated

TomoTherapy Incorporated has developed, manufactures and sells the Hi-Art[R] system, one of the most advanced and versatile radiation therapy systems commercially available for the treatment of a wide variety of cancers. TomoTherapy Incorporated markets the Hi-Art[R] system to university research centers, hospitals, private and governmental institutions and cancer treatment centers in North America, Europe and Asia.

Hi-Art[R], TomoTherapy[R], and the TomoTherapy logo are registered trademarks of TomoTherapy Incorporated.