ATG Ranked One of the 500 Fastest-Growing Technology Companies in North America On Deloitte & Touche Technology Fast 500.

Business/Technology Editors

Recognition Attributed to 3918 Percent Revenue Growth Over Five Years

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Nov. 16, 2000

Art Technology Group, Inc. ("ATG") (Nasdaq: ARTG), a leading provider of online customer management and e-business solutions, today announced that it has achieved placement of #105 on the Deloitte & Touche Technology Fast 500, a ranking of the 500 fastest-growing technology companies in North America. This is the fourth consecutive year that ATG has achieved placement on this elite list.

Rankings are based on five-year percentage revenue growth from 1995-1999. The 3918 percent increase in revenues ATG experienced over the five-year period of 1995 to 1999 attributes to the #105 ranking on the Fast 500 for 2000. ATG ranked at #199 in 1999 and #374 in 1998.

"The vision and determination of management and employees at ATG has propelled them through Deloitte & Touche's elite list of the fastest-growing technology companies in the United States and Canada," said Mark A. Evans, managing director of Deloitte & Touche's Technology and Communications Group. "Their placement on - and advancement through - the list over four consecutive years is something few companies have done, and we commend them on the achievement."

In addition to ranking on the Deloitte & Touche Technology Fast 500, ATG ranked #5 on the New England Fast 50, which is a ranking of the 50 fastest-growing technology firms in New England.

"ATG is proud to have advanced so aggressively over the last three years on the Deloitte & Touche Fast 500 list," said Jeet Singh, CEO and co-founder of ATG. "The company's new ranking of #105 is a welcome reminder of our accomplishments throughout the last year. ATG attributes this success to the strength of our product development, an expanded sales organization, and broadened market awareness."

With the recent launch of the ATG Dynamo 5 e-Business Platform, ATG introduced full-featured applications designed to speed delivery of commerce and optimize personalization with scenario-driven technology, while retaining the advantage of being a fully customizable, scalable, and extensible platform. ATG currently has over 525 customers that entrust ATG to provide the framework necessary to successfully deploy and manage their online customer relationships.

Overall, companies that ranked on the 2000 Technology Fast 500 had five-year growth rates ranging from 71,257 to 593 percent, with an average growth rate of 3,956 percent. The majority of Fast 500 winners, or 46 percent, are in the software industry. Seventeen percent are Internet related, and nine percent are in the biotechnology industry. The remaining companies are in medical, technical and scientific manufacturing at nine percent, communications at nine percent, computers and peripherals at five percent and semiconductors, components and electronics at two percent, with the remaining three percent in other types of technology.

In its selection of the 2000 Fast 500, Deloitte & Touche's team reviewed financial records for more than 5,000 public and privately held technology companies. To qualify, companies must: (1) have had 1995 revenues of at least $50,000 USD and $75,000 for the United States and Canada, respectively; (2) be headquartered in the United States or Canada; and (3) be a "technology company." "Technology company" is defined as one that develops proprietary technology which contributes to a significant portion of the company's operating revenues, manufactures a technology product, or devotes a high percentage of effort to the research and development of technology.

Technology Fast 500 winners are invited to an exclusive CEO Summit that will be held from May 30-June 1, 2001 at the Four Seasons Resort Aviara, Carlsbad, California. The CEO Summit, now in its third year, is designed to address the unique business challenges facing these super-charged technology companies.

For more information on Deloitte & Touche, visit their web site at www.us.deloitte.com. For more information on the Deloitte & Touche Technology Fast 500 or Technology Fast 50 programs, visit www.fast500.com.

About ATG

ATG is a leading provider of online customer relationship management and electronic commerce products and services. ATG offers an integrated suite of Java(TM) application server-based products and services, as well as related application development, integration and support services. The ATG Dynamo(R) e-Business Platform enables Global 2000 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.

With its network of more than 225 solution partners, ATG has delivered e-business solutions to over 530 companies worldwide including 3M, Aetna Services, Inc., American Airlines, Blockbuster, BabyCenter, BMG Direct, ChipCenter, Eastman Kodak, HSBC, Herman Miller, J. Crew, Network Solutions, Sun Microsystems, and Target. The company is headquartered in Cambridge, Massachusetts with additional locations throughout North America, Europe, Asia and Australia.

About Deloitte & Touche

Deloitte & Touche, one of the nation's leading professional services firms, provides assurance and advisory, tax, and management consulting services through 30,000 people in more than 100 U.S. cities. The firm is dedicated to exceeding the expectations of its clients and its people. Known as an employer of choice for its innovative human resources programs, Deloitte & Touche has been recognized as one of the "100 Best Companies to Work for in America" by Fortune magazine for three consecutive years. Deloitte & Touche is part of Deloitte Touche Tohmatsu, one of the world's leading professional services firms, with more than 90,000 people in over 130 countries.

(c)2000 Art Technology Group, Inc. ATG, the Techmark, the ATG logo, and Dynamo are registered trademarks, and Personalization Server and Scenario Server are trademarks, of Art Technology Group, Inc. All other trademarks are the property of their respective holders. NASDAQ:ARTG.

This press release contains forward-looking statements for purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995. These statements involve known and unknown risks and uncertainties that may cause ATG's actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward-looking statements. Important risk factors affecting ATG's business generally may be found in ATG's periodic reports and registration statements filed with the Securities and Exchange Commission. Risk factors related to the subject matter of this press release include the possibility that the company's growth may not continue at past rates and may not qualify it to be included in future award; unrealistic customer evaluations; the need to adapt to rapid changes so products do not become obsolete; the possibility of errors in ATG's software products; non-responsiveness of the market to such awards; and the costs and risks associated with intellectual property infringement and litigation. ATG undertakes no obligation to update any of the forward-looking statements after the date of this press release.