The main clue is that one of the bosses of [.] is Hippolyte Kurtzmann (to be more accurate, he is an unnamed character played by the same actor).
WMG / Les Operateurs
Les Opérateurs is set in the same universe that Flander's Company.[.] is a firm which goals are quite nebulous, including manipulation. Although not the main goal of the Flander's Company, it could be linked with their main activity, so it is not impossible that [.] is a small group belonging to the Flander's Company. The most credible hypothesis is that [.] is set in the future of Flander's Company, in which Hippolyte Kurtzmann obtain a promotion and became one of the Shareholders of [.].