NJJ is a French holding company controlled by Xavier Niel that owns numerous companies. The company's main activities are in telecommunications, real estate and the press, notably through its stakes in Salt Mobile, Eir, Unibail-Rodamco-Westfield and Nice-Matin.
The holding company, which takes its name from “Niel John Jules”, the two given names of Xavier Niel's sons, has numerous subsidiaries - at least 25 at one time.[1]