Art Technology Group, Inc. Commences Initial Public Offering of Common Stock.

BOSTON--(BUSINESS WIRE)--July 21, 1999--

Art Technology Group, Inc. (Nasdaq:ARTG) announced today that the initial public offering (IPO) of 5,000,000 shares of its Common Stock has commenced at an initial public offering price of $12.00 per share. The shares are being offered through a syndicate of underwriters led by Hambrecht & Quist LLC, U.S. Bancorp Piper Jaffray Inc., Thomas Weisel Partners LLC and Wit Capital Corporation. The underwriters have a 30-day option to purchase up to 750,000 additional shares of Common Stock from the Company and stockholders of the Company solely to cover over-allotments, if any.

Art Technology Group, Inc. (ATG) is a leading provider of Internet customer relationship management and e-commerce products and services. ATG offers an integrated suite of Java application server-based products and services, as well as related application development, integration and support services. ATG's Dynamo product suite enables Fortune 1000 enterprises, as well as new businesses using the Internet as their primary business channel, to understand, manage and build their online customer relationships and to more effectively market, sell and support their products and services over the Internet.

A copy of the final prospectus may be obtained from the offices of Hambrecht & Quist LLC, One Bush Street, San Francisco, California, 94104, telephone number [phone], U.S. Bancorp Piper Jaffray Inc., 222 South Ninth Street, Minneapolis, Minnesota, 55402, telephone number [phone], Thomas Weisel Partners LLC, One Montgomery Street, Suite 3700, San Francisco, California, 94104, telephone number [phone], or Wit Capital Corporation, 826 Broadway, 7th Floor, New York, New York, 10003, telephone number [phone].