The invention relates to a forming device for forming and partitioning a pasty food strand as well as to a filling machine with a respective forming device and to a method. The forming device comprises more than two flat displacement elements superposed in the direction of transport of the food strand, each having at least one opening through which the food strand can be moved in the direction of transport. The forming device further comprises a movement mechanism for moving the flat displacement elements on respective curved paths, such that the respective openings can move relative to each other, so that the cross-sectional area of the resulting overall opening of the superposed openings changes.