Diploma Results Presentation Deck

14 Diploma PLC Half Year 2023 Results Disciplined portfolio development Strong track record Total investment since FY19 £840m Average organic growth since acquisition 15% Average ROATCE >16% and growing Group ROATCE 17.8% Up 30 bps Year-to-date Acquired TIE for £76m • Entry to strategically important Industrial Automation end market in the US Continued small bolt-ons to our core business lines • Completed seven for £23m Strong organic growth potential at accretive operating margins ● Average EBIT multiple under 5x £24m of annual revenue Accretive EBIT margins and 20% year one ROATCE Continued portfolio management discipline Disposal of non-core business for £23m ● Acquisitions accelerating organic growth DIPLOMA PLC

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