X0306 4 2017-02-22 0 0001624899 Steris plc STE 0001209524 KOSECOFF JACQUELINE B C/O CHANCERY HOUSE, 190 WATERSIDE ROAD HAMILTON INDUSTRIAL PARK LEICESTER X0 LE5 1QZ UNITED KINGDOM 1 0 0 0 Ordinary Shares, 0.10 par value 2017-02-22 5 G 0 E 21239 0.00 D 10038 D Ordinary Shares, 0.10 par value 2017-02-22 5 G 0 E 21239 0.00 A 30302 I See Footnote Below. These ordinary shares are held in a revocable family trust of the Reporting Person and the Reporting Person's spouse, as Co-Trustees. /s/ Ronald E. Snyder, Authorized Representative under Power of Attorney 2017-02-24