Dunnhumby

The company was formed by husband and wife team Clive Humby and Edwina Dunn. Humby was a University of Sheffield trained mathematician and the couple both worked at Caci. Wanting to start his own business, Humby resigned from Caci and left on the day that Dunn was dismissed. The couple started Dunnhumby in 1989, in the kitchen of their Chiswick, west London home. The company began working with clients, including Cable & Wireless and BMW.

In May 2018, Dunnhumby acquired marketing and promotions management company Aptaris.

Tesco originally bought a 53% stake in 2001 for a reported £30m, increasing this to 84% in 2006, before purchasing the rest of the shares. The company employs more than 2,500 people in 30+ countries, selling information from a 40-terabyte database to companies including Procter & Gamble, Coca-Cola and US retailer Kroger. Dunn and Humby resigned from the company in October 2010 and remained non-executive directors through early 2013. Dunn and Humby invested in the theatre analytics business Purple Seven in 2013.

KSS Retail, a provider of analytics software and services for retail price optimization and promotions planning, was acquired by Dunnhumby in 2010. Founded in Manchester, UK, KSS Retail operated as a separate business unit until October 2015, when it was rebranded as Dunnhumby Price and Promotion Archived 27 January 2016 at the Wayback Machine. KSS Retail developed and commercialized optimization software called PriceStrat that helps retailers identify the right prices and promotions as part of a revenue management and merchandising strategy. Through Dunnhumby Price and Promotion, the business also provides artificial intelligence software that helps retailers with promotions and market basket analytics.

BzzAgent, a Boston-based social marketing and advocacy start-up, was acquired by Dunnhumby in 2011. Founded in 2001, BzzAgent runs word-of-mouth networks in North America, Brazil and the United Kingdom, enlisting unpaid volunteers to try products from companies including Procter & Gamble, Unilever and L’Oréal, then share opinions about those products with others, in-person and online. PowerReviews acquired BzzAgent from Dunnhumby in July 2018.

Berlin-based global advertising technology firm Sociomantic Archived 25 October 2014 at the Wayback Machine was acquired by Dunnhumby in 2014, according to Dunnhumby's then CEO Simon Hay, to improve customers' online experiences by "mak[ing] online content personalised for people, based on what they actually like, want and need." The company, founded in 2009, uses real-time bidding technology to purchase and display personalized digital advertising in milliseconds. Sociomantic operates in over 60 markets and 19 offices worldwide.