ATG To Present AeA Classic Financial Conference.

CAMBRIDGE, Mass. -- ATG (Art Technology Group, Inc.)(NASDAQ:ARTG) today announced that the company is scheduled to present at the AeA Classic Financial Conference on Tuesday, November 9, 2004 and Wednesday, November 10, 2004. At the conference, Chief Executive Officer Bob Burke and Chief Financial Officer Ed Terino will provide insight about the company's business strategy, financial results and its recent acquisition of Primus Knowledge Solutions, Inc.

ATG's presentation at 6:00 p.m. (ET) will be broadcast live over the Internet. Interested parties may tune in to the live presentation by visiting the investors section of ATG's website at www.atg.com.

ABOUT ATG

ATG (Art Technology Group, Inc., NASDAQ: ARTG) delivers innovative software to help high-end consumer-facing companies create a richer, more adaptive interactive experience for their customers and partners online and via other channels. ATG has delivered category-leading e-business solutions to many of the world's best-known brands including A&E Networks, American Airlines, AT&T Wireless, Best Buy, Fidelity Investments, France Telecom, Friends Provident, Hewlett-Packard, InterContinental Hotels Group, Kingfisher, Merrill Lynch, Neiman Marcus, Philips, Procter & Gamble, Target, US Army, US Federal Aviation Administration, Warner Music, and Wells Fargo. The company is headquartered in Cambridge, Massachusetts, with additional locations throughout North America, Europe, and Asia. For more information about ATG, please visit www.atg.com.

(C) 2004 Art Technology Group, Inc. ATG and Art Technology Group are registered trademarks of Art Technology Group, Inc. All other product names, service marks, and trademarks mentioned herein are trademarks of their respective owners.