Diploma Results Presentation Deck

29 Diploma PLC Half Year 2023 Results Financial KPIs Five year trends Revenue Total growth Organic growth Adjusted operating margin Working capital (% revenues) Free cash flow Free cash conversion (%) ROATCE Average over five years: Organic revenue growth 6.4% 2022 £1,012.8m +29% +15% 18.9% 15.6% £120.4m 90% 17.3% 2021 £787.4m +46% +12% 18.9% 15.8% £108.8m Adjusted operating margin 17.9% 103% 17.4% 2020 £538.4m ROATCE -1% -7% 16.2% 16.0% £72.5m 113% 19.1% 20.2% 2019 £544.7m +12% +5% 17.8% 16.5% £56.5m 78% 22.9% 2018 £485.1m Free cash flow conversion 96% +7% +7% 17.5% 15.1% £60.5m 95% 24.5% DIPLOMA PLC

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