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We examine a free transmission problem driven by fully nonlinear elliptic operators. Since the transmission interface is determined endogeneously, our analysis is two-fold: we study the regularity of the solutions and geometric properties of the free boundary. We prove that strong solutions are locally of class C 1,1 , locally. As regards the free boundary we start by establishing weak results, such as its non-degeneracy, and proceed with the characterization of global solutions. Then, we turn our attention to the set of non-degenerate points. We find this set inherits the regularity of the solutions. That is, it is locally the graph of a C 1,1 -regular function, with universal estimates.