[5] The original business plan was to build a caching and acceleration platform, though, through customer interviews and after getting feedback from prospective customers, Pat Figley identified the problem in the industry of "too much data" and the founders shifted their strategy to provide security events analysis and correlation.

[9] Robert Shaw retired effective October 1, 2008, citing health reasons.

In September 2010, HP announced an agreement to acquire ArcSight for approximately $1.5 billion.

[15] On September 7, 2016, HPE CEO Meg Whitman announced that the software assets of Hewlett Packard Enterprise, including Arcsight and the rest of the HP Enterprise Security Products group, would be spun out and then merged with Micro Focus to create an independent company of which HP Enterprise shareholders would retain majority ownership.

[citation needed] On February 14, 2019, Micro Focus announced it had acquired Interset, a security analytics software company that provides cyber-threat protection, and announced plans to use Interset's technology to add additional value to Micro Focus ArcSight.