A filling machine for containers simultaneously fills an array of containers, for examples immediately following depalletizing, and includes motor driven positioners for the nozzles to accommodate changes in the size of container being run. The containers are laterally abutted to occupy evenly spaced container positions, and the array can be compressed by a contoured push bar to force the entire array into registry. The nozzles are flexibly coupled to a source of material to be discharged into the containers, and are mechanically moved by actuators that displace at least a subset of the nozzles along the axes of the array. In this way the nozzles are moved into registry with the container array. The nozzles are also vertically movable relative to the containers, and each includes a valve opened by contact with a respective container, for discharging only into occupied container positions and not voids in the array. The actuators include at least one motor drive to advance and retract the nozzles along at least one of the axes, and preferably the nozzles along particular rows and columns have a common positioning motor such as a threaded rod and nut arrangement.