A closed-loop microelectromechanical accelerometer includes a substrate (23) of semiconductor material, an out-of-plane sensing mass (13) and feedback electrodes (17a-17d). The out-of-plane sensing mass (13), of semiconductor material, has a first side (13a) facing the supporting body (11) and a second side (13b) opposite to the first side (13a). The out-of-plane sensing mass (13) is also connected to the supporting body (11) to oscillate around a non-barycentric fulcrum axis (F) parallel to the first side (13a) and to the second side (13b) and perpendicular to an out-of-plane sensing axis (Z). The feedback electrodes (17a-17d) are capacitively coupled to the sensing mass (13) and are configured to apply opposite electrostatic forces (F FB1 , F FB2 ) to the sensing mass (13).