Diploma Results Presentation Deck

30 Diploma PLC Half Year 2022 Results Financial KPIs Five year trends Revenue Total growth Underlying growth Adjusted operating margin Working capital (% revenues) Free cash flow Free cash conversion ROATCE Average over five years: CAGR revenue growth 16% p.a. 2021 £787.4m +46% +12% 18.9% 15.8% £108.8m 103% 17.4% 2020 £538.4m (1)% (7)% 16.2% 16.0% £72.5m 113% 19.1% Adjusted operating margin 17.5% 2019 £544.7m +12% +5% 17.8% 16.5% £56.5m 78% 22.9% ROATCE 22% 2018 £485.1m +7% +7% 17.5% 15.1% £60.5m 95% 24.5% 2017 £451.9m +18% +7% 17.3% 15.0% £55.7m 99% 24.0% Free cash flow conversion 97% DIPLOMA PLC

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