Diploma Results Presentation Deck

18 Diploma PLC Half Year 2023 Results Controls % of Group revenue 48% Sector revenue mix* O Windy City Wire Wire & Cable (UK) Interconnect Fasteners Adhesives Automation * Pro forma revenues adjusted for acquisitions and disposals completed during the year 49% 8% 23% 11% 3% 6% Revenue Organic growth Adjusted operating profit Adjusted operating margin ● ● ● H1 2023 £278.8m +13% £64.3m 23.1% H1 2023 highlights • WCW organic +10%: sustained double-digit growth against strong prior year comparator Excellent performance in International Controls with organic growth +15%: Market share gains in recovering civil aerospace markets Structural tailwinds in defence and energy markets Strong footholds in Europe/US across established end markets and growing well Portfolio development - Adhesives: strong organic growth, two bolt-on acquisitions Industrial Automation market entry with TIE - Disposal of non-core Hawco business Margin +210bps: H1 2022 £224.0m +28% £47.0m 21.0% Scale benefits and performance Disposal of Hawco will be margin accretive to the Sector Change +24% +37% +210bps DIPLOMA PLC

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