We construct a class of exact ground states of three-dimensional periodic Anderson models ͑PAMs͒, including the conventional PAM, on regular Bravais lattices at and above 3 / 4 filling, and discuss their physical properties. In general, the f electrons can have a ͑weak͒ dispersion, and the hopping and the nonlocal hybridization of the d and f electrons extend over the unit cell. The construction is performed in two steps. First the Hamiltonian is cast into positive semidefinite form using composite operators in combination with coupled nonlinear matching conditions. This may be achieved in several ways, thus leading to solutions in different regions of the phase diagram. In a second step, a nonlocal product wave function in position space is constructed which allows one to identify various stability regions corresponding to insulating and conducting states. The compressibility of the insulating state is shown to diverge at the boundary of its stability regime. The metallic phase is a non-Fermi-liquid with one dispersing and one flat band. This state is also an exact ground state of the conventional PAM and has the following properties: ͑i͒ it is nonmagnetic with spin-spin correlations disappearing in the thermodynamic limit, ͑ii͒ density-density correlations are short ranged, and ͑iii͒ the momentum distributions of the interacting electrons are analytic functions, i.e., have no discontinuities even in their derivatives. The stability regions of the ground states extend through a large region of parameter space, e.g., from weak to strong on-site interaction U.