[3] Dia is a discount supermarket chain which follows a policy of reduction of prices by means of minimizing operational costs.

Its policy of communication is based on mass media campaigns as well as periodic flyers featuring products which are on special sale.

[14] In November 2014, Eroski sold 160 of its stores to Dia for 146 million euros, in the regions of Andalusia, Extremadura, Castile and León and Castile-La Mancha, with the aim of getting out of debt.

[17] In May 2019, the LetterOne investment firm increased its share in the Dia Group to 69,76%, effectively taking control of the company.

[19] In March 2023, the National Markets and Competition Commission (CNMC) authorized the sale of 224 locations to Alcampo, 11 fewer than initially planned to avoid a monopoly in certain areas.

[20] Dia announced the sale of its 1,015-store Clarel beauty store chain to Spanish fund C2 Private Capital for around €60 million in December 2022.

[22] Dia announced in August 2023 the sale of its Portuguese subsidiary Minipreço with 489 stores to French retailer Auchan for €155 million.

[23] On 5 December 2023 Dia Retail announced the sale of its 1,015 Clarel beauty stores in Spain to Colombia's Grupo Trinity S.A.S.