SAN FRANCISCO, February 5, 2010 — ThinkEquity LLC – A Panmure Gordon Company, a leading investment banking boutique focused on growth companies and their investors, is pleased to announce the completion of a follow-on offering of stock by Art Technology Group, Inc. (NASDAQ: ARTG) on February 5, 2010. The Company issued 28,750,000 shares of common stock at a price of $3.50 per share raising gross proceeds of $100.6 million. ThinkEquity LLC acted as a Co-Manager in this transaction. ATG is a global specialist in e-commerce. ATG Commerce is a commerce platform and business user application solution designed to power personalized, efficient and effective e-commerce sites. ATG's platform-neutral optimization services can be added to any Web site to increase conversions and reduce abandonment. These services include ATG Recommendations and ATG's live help services, including ATG eStara Click to Call, and Click to Chat. The company is headquartered in Cambridge, Massachusetts, with additional locations throughout North America and Europe. The securities described above were offered by Art Technology Group Inc. pursuant to a S3 registration statement previously filed with and declared effective by the Securities and Exchange Commission on November 18, 2009. The final prospectus is available at the SEC’s website at, or by contacting ThinkEquity LLC at 600 Montgomery Street, 3rd Floor, San Francisco, CA 94111, Attn: Prospectus Department 415-249-2935. ThinkEquity Contact: Janet Faleski Managing Director T: 212.468.7083 E: