A spinneret (1) is provided for a multi-row coaxial spunbond and/or melt-blown plant developing along a main axis (1a) and a main plane (1b), defining a vertical axis (1c) perpendicular to the main axis (1a) and the main plane (1b) and comprising a plurality of acceleration conduits (2) each extending along its own dispensing axis (2a) transverse to the main plane (1b) and adapted to each dispense a respective polymeric filament along the dispensing axis (2a); a plate (7) including first holes (70) adapted to house the acceleration conduits (2), and second holes (71) separated from the first holes (70) and adapted to allow the passage of air or gas; a mask (8) adjacent to the plate (7) along the vertical axis (1a), including a plurality of third holes (80) centered with respect to the first holes (70), in fluid passage connection with the second holes (71) and adapted to house part of the acceleration conduits (2) and to allow, at the same time, the passage of air or gas, wherein the second holes (71) are more than four in number, distributed around at least part of the first holes (70) and centered along circumferences (7a) each developing parallel to the main plane (1b) around a respective first hole (70) without touching any other first hole (70).