Siebel Systems, Inc. () was a software company principally engaged in the design, development, marketing, and support of customer relationship management (CRM) applications—notably Siebel CRM. The company was founded by Thomas Siebel and Patricia House in 1993. At first known mainly for its sales force automation products, the company expanded into the broader CRM market. By the late 1990s, Siebel Systems was the dominant CRM vendor, peaking at 45% market share in 2002. On September 12, 2005, Oracle Corporation announced it had agreed to buy Siebel Systems for $5.8 billion. "Siebel" is now a brand name owned by Oracle Corporation. Siebel Systems is Oracle's on-premises CRM system, and Oracle's cloud applications for CRM are Oracle Advertising and Customer Experience (CX). History Siebel Systems, Inc. began in sales force automation software, then expanded into marketing and customer service applications, including CRM. From the time it was founded in 1993, the company grew quickly. Benefiting from the explosive growth of the CRM market in the late 1990s, Siebel Systems was named the fastest growing company in the United States in 1999 by Fortune magazine. Thomas Siebel, Pat House Siebel's "first experience with sales technology was in the late 1980s, when he worked for .. Oracle." At the time, Siebel Systems co-founder Pat House also was working for Oracle. Siebel left Oracle to try his hand at a startup. In 1992 House left Oracle and together they worked on what became Siebel Systems (in 1993). Key dates 1993: Siebel Systems, Inc. is founded. 1995: Siebel delivers Siebel Sales Enterprise software for sales force automation. 1995: Siebel 2.0 (Release end of 1995) Siebel Customer Relationship Management (CRM) Siebel Sales Enterprise 1996: Siebel becomes a publicly traded company. 1997: Siebel 3.0 (Release Feb 1997) 1998: Siebel 98 1998: Siebel Systems acquires Scopus Technology, Inc. "for its customer-service and support products." 1999: Siebel 99 2000: Siebel 6 (also known as Siebel 2000) 2000: Revenue surpasses the $1 billion mark. 2001: Siebel 7.0 (Released 2001, was the first web-based version) 2002: Siebel 7.5 (Released in 2002) 2004: Siebel 7.7 (Released in 2004) 2005: Siebel 7.8 (Released in 2005) 2006: Oracle acquires Siebel Systems. 2007: Oracle Siebel 8.0 (Released in 2007) 2007: Oracle Business Intelligence Enterprise Edition Plus (released 2007) 2007: Oracle Business Intelligence Applications (Formerly Siebel Analytics) (released 2007) 2008: Oracle Siebel 8.1 (Released in 2008) 2011: Oracle Siebel 8.2 (Released in 2011) Oracle Sales Cloud Oracle