1991: ATG is cofounded by Jeet Singh and Joseph "Joe" Taisup Chung, both graduates of MIT.[citation needed]
1991-1996: ATG delivered consulting services for building Web sites[citation needed]
1997-1998: ATG transitioned to a software company offering several products including an Application Server and an e-commerce platform.
1999: ATG made its initial public offering.[5]
2000-2003: Focused on commerce applications, business tools for content management, merchandising, marketing and analytics; shift to industry standard application servers from IBM, BEA and JBoss.
2004: ATG acquired Primus Knowledge Solutions[6] in a disputed[7][8] acquisition that closed on November 1, 2004.
2005: ATG completed the integration of the Primus applications onto the ATG Web marketing and ecommerce software platform
2006: ATG acquired eStara,[9][10] a provider of click to call, chat and call tracking solutions.
2008: ATG acquired privately held CleverSet;[11][12] the transaction closed on February 6, 2008.
2010: ATG acquired privately held InstantService;[13][14] the transaction closed on January 12, 2010.
2010: Oracle Corporation reaches an agreement with ATG to start the acquisition process of ATG into Oracle. The announcement of the acquisition agreement was made public on November 2, 2010.[15]
2011: Oracle Corporation completes its acquisition of ATG on January 5, 2011, for an estimated $1 billion, or $6.00 a share.[15]