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ThinkEquity LLC acts as Co-Manager on Art Technology Group Inc.'s Follow-On Offering

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 http://www.sec.gov, 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: jfaleski@thinkequity.com

Media enquiries:

Nathaniel Webb
Group Communications and Investor Relations Director
T: +44 20 7614 8333
E: nathaniel.webb@panmure.com

About ThinkEquity LLC — A Panmure Gordon Company
Focused on the growth sectors of the economy, ThinkEquity provides research, equity financing, M&A advisory, institutional sales and trading, wealth management and asset management services to institutional investors, corporate and private clients, venture capitalists, entrepreneurs and financial sponsors. As a Panmure Gordon company, ThinkEquity accesses the combined financial expertise of professionals based in San Francisco, New York, Boston, Chicago, London, Liverpool and Geneva. Research-driven, we remain true to our founding principles: the power of growth, focus, deep domain expertise and people. www.thinkequity.com

About the Panmure Gordon Group
Founded in 1876, Panmure Gordon & Co. (PMR.L) is a leading independent institutional stockbroker and investment bank. Encompassing its US franchise, ThinkEquity, LLC, the Group employs approximately 240 professionals across the US, the UK, Singapore and Nyon, Switzerland, offering a blend of transatlantic financial services including research, sales and trading, wealth management and asset management. www.panmure.com