NCC Group was formed in June 1999, when the National Computing Centre sold its commercial divisions to its existing management team supported by private equity firm ECI Ventures.

[2] After rapid expansion, in July 2007 the Group made the move to the London Stock Exchange's main market.

[7] In August 2020, training materials, from NCC Group, a founding member of the cyber security certification body CREST, including practical examination “cheat sheets” for the CREST CCT INF and CCT APP examinations were leaked on to the GitHub and Dropbox platforms.

[10] Due to the breach of exam integrity CREST suspended practical examinations and in a statement said it "will be appointing an independent investigative panel.”[10][11] NCC Group has expanded through a mixture of organic growth and acquisitions: In 2012 NCC Group announced the investment of £6 million over 15 months in a wholly owned subsidiary, Artemis Internet.

[34] In 2014 NCC Group acquired the right to operate the generic Top Level Domain (gTLD) .trust from Deutsche Post.