Following a request from the European Commission, the Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) was asked to deliver a scientific opinion on the safety and efficacy of Ronozyme HiPhos M/L (6-phytase) as a feed additive for poultry and pigs. The additive is an enzyme preparation containing 6-phytase produced by a genetically modified strain of Aspergillus oryzae. The additive has the potential to improve phosphorus utilization in all poultry at the minimum dose of 500 FYT/kg complete feed, as demonstrated in short-term trials with chickens and turkeys for fattening, and laying hens. Improved phosphorus utilization was also seen in weaned piglets and pigs for fattening at the minimum dose of 500 FYT/kg complete feed and at the minimum dose of 1,000 FYT/kg complete feed for sows. The use of the additive allows the use of diets with a lower level of inorganic phosphorus, which may in turn reduce the excretion of phosphorus. It is intended to be used as a zootechnical feed additive for poultry, weaned piglets and pigs for fattening in a dose range of 500 to 4,000 FYT/kg feed; and in sows in a dose range of 1,000 to 4,000 FYT/kg feed.