  Recent results on the calculation of 3-loop massive operator matrix elements
in case of one and two heavy quark masses are reported. They concern the $O(n_f
T_F^2 C_{F,A})$ and $O(T_F^2 C_{F,A})$ gluonic corrections, two-mass quarkonic
moments, and ladder- and Benz-topologies. We also discuss technical aspects of
the calculations.
