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1 DIPLOMA PLC FULL YEAR RESULTS 2025 18 NOVEMBER 2025 VERY STRONG RESULTS. GREAT MOMENTUM. FULL YEAR RESULTS FOR THE YEAR ENDED 30 SEPTEMBER 2025
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2 DIPLOMA PLC FULL YEAR RESULTS 2025 AGENDA OVERVIEW 01 FINANCIAL PERFORMANCE 02 STRATEGY AND BUSINESS REVIEW 03
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3 DIPLOMA PLC FULL YEAR RESULTS 2025 OVERVIEW
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4 DIPLOMA PLC FULL YEAR RESULTS 2025 01 OVERVIEW VERY STRONG RESULTS, AHEAD OF EXPECTATIONS. GREAT MOMENTUM 1 Return on Adjusted Trading Capital Employed (ROATCE) 2 Including two in FY26 VERY STRONG PERFORMANCE AMBITION WITH DISCIPLINE STRONG PORTFOLIO IN ATTRACTIVE MARKETS COMPOUNDING ACQUISITIONS POSITIVE MOMENTUM INTO FY26 6 Acquisitions since start Q4 2 >4,000 Pipeline opportunities 0.8X Significant leverage headroom +6% Organic growth c.22.5% Operating margin Guidance Attractive end markets Structural support for long-term growth 53% North America 18% United Kingdom 19% Europe 10% Australasia / other ↑11% Organic growth ↑22.5% Operating margin +160bps ↑21% EPS growth ↑20.9% Return on capital 1 +180bps
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5 DIPLOMA PLC FULL YEAR RESULTS 2025 A LONG TRACK RECORD OF COMPOUNDING ACCELERATED UNDER CURRENT STRATEGY 01 OVERVIEW We’re just getting started 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Adjusted EPS Revenue 7-year CAGR: 19% revenue 7% organic growth 18% EPS
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6 DIPLOMA PLC FULL YEAR RESULTS 2025 DELIVERING SUSTAINABLE QUALITY COMPOUNDING 01 OVERVIEW AMBITIOUS GROWTH Differentiated value-add business model Significant white space Fragmented markets and large acquisition pipeline Quality and diversity of portfolio DISCIPLINED DELIVERY Intensely returns focused Highly cash generative Powerful decentralised culture Tight portfolio management Depth and quality of management Disciplined capital allocation Structurally growing end market exposure Strong M&A competitive advantage
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7 DIPLOMA PLC FULL YEAR RESULTS 2025 PEOPLE AND CULTURE A powerful, thriving decentralised culture Developing the next generation of leaders Highly engaged colleagues Energetic mood 01 OVERVIEW We are down to earth
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8 DIPLOMA PLC FULL YEAR RESULTS 2025 FINANCIAL PERFORMANCE
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9 DIPLOMA PLC FULL YEAR RESULTS 2025 STRONG FULL YEAR PERFORMANCE AMBITION… 02 FINANCIAL PERFORMANCE Sustainable quality compounding 1 Return on Adjusted Trading Capital Employed (ROATCE) …WITH DISCIPLINE Organic revenue growth 11% Revenue growth 12% Adjusted operating profit margin 22.5% Adjusted EPS growth 21% Free cash flow conversion 105% Return on capital1 20.9% Leverage2 0.8x Dividend growth 5% 20.9% 6% 14% 21% 101% 19.1% 1.3x 5% 2 Net debt/EBITDA FY24 FY24FY25 FY25
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10 DIPLOMA PLC FULL YEAR RESULTS 2025 REVENUE GROWTH 02 FINANCIAL PERFORMANCE Very strong organic growth £1,363m £1,525m FXNet acquisitions +20% +6%+2% Controls Life Sciences Seals Organic growth: 11% FY25FY24 12% reported revenue growth Year ended 30 September
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11 DIPLOMA PLC FULL YEAR RESULTS 2025 MARGIN EXPANSION 02 FINANCIAL PERFORMANCE Year ended 30 September 20.9% £343m Pricing Inflation FX Opex reinvestment Net acquisitionsVolume Value-add Margin formula 22.5% FY25FY24 £285m 20% operating profit growth All profit metrics are adjusted and stated before acquisition related and other charges and acquisition related finance charges 160bps operating margin expansion
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12 DIPLOMA PLC FULL YEAR RESULTS 2025 COMPOUNDING EPS GROWTH 02 FINANCIAL PERFORMANCE Year ended 30 September 145.8p 176.0p Operating profit growth Interest Tax FX 49.7 (0.1) (14.3) (5.1) FY25FY24 21% EPS growth All profit and earnings metrics are adjusted and stated before acquisition related and other charges and acquisition related finance charges Continuing our long-term track record
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13 DIPLOMA PLC FULL YEAR RESULTS 2025 DISCIPLINED STEWARDSHIP OF CAPITAL 02 FINANCIAL PERFORMANCE 1 Return on Adjusted Trading Capital Employed (ROATCE) CAPITAL ALLOCATION PRIORITIES SELECTIVE INVESTMENT FOR ORGANIC GROWTH Capital-light model (c.2% capex / revenue) drives 90% cash conversion 1 TARGETED ACQUISITIONS TO DRIVE FUTURE ORGANIC GROWTH Acquisitions deliver 20% return on capital1 over time 2 RETURNS TO SHAREHOLDERS Progressive dividend – 5% annual growth 3 BALANCE SHEET PRUDENCE Net debt / EBITDA < 2.0x 4 Return on capital
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14 DIPLOMA PLC FULL YEAR RESULTS 2025 STRONG CASH CONVERSION 02 FINANCIAL PERFORMANCE Year ended 30 September Working capital Net capex Dividend (16.5) Other FY24 FY25 Depreciation Interest & tax FX (80.9) (29.6) (22.6)(98.2) (4.6)43.0 342.7 Adjusted operating Profit (13.1) £247.2m Free cash flow Net debt £419.6m Net debt £299.4m 1.3x Leverage 0.8x Leverage Net acquisitions 105% free cash flow conversion
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15 DIPLOMA PLC FULL YEAR RESULTS 2025 FINANCIAL FIREPOWER Strong capacity for self-funded growth Significant leverage headroom • 0.8x in FY25 • Balance sheet naturally de-levers at 0.4x per annum Increasing capacity to keep pace with 2x leverage in line with our growth Funding (£m) 0 200 400 600 800 1,000 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 USPP RCF 02 FINANCIAL PERFORMANCE Plans to increase facilities to fund ambitious growth over the long term
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16 DIPLOMA PLC FULL YEAR RESULTS 2025 ACQUISITION MOMENTUM 02 FINANCIAL PERFORMANCE Building quality in our portfolio 1. Acquired in Q1’26 | 2. Two in Q1’26 | 3. At the time of acquisition Q4 Alpha Laboratories Life Sciences UK Astro Industries International Controls US WDS Components1 International Controls UK 6 bolt-on acquisitions2 £92m invested c.8x EBIT average multiple3 Haagensen International Seals Denmark Electramed Life Sciences Ireland Spring Solutions1 International Controls UK
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17 DIPLOMA PLC FULL YEAR RESULTS 2025 DISCIPLINED RETURNS 02 FINANCIAL PERFORMANCE 1 Return on Adjusted Trading Capital Employed (ROATCE) High returns represents the discipline of compounding High teens returns is our sweet spot Acquisitions must reach 20% FY25 reflects strong performance and lower-than-typical acquisition spend 22.9 19.1 17.4 17.3 18.1 19.1 20.9 FY19 FY20 FY21 FY22 FY23 FY24 FY25 Return on capital1 (%) Optimal returns range 15-20% £1.4bn capital deployed on acquisitions
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18 DIPLOMA PLC FULL YEAR RESULTS 2025 Significantly H1 weighted FY26 reflecting strong H2 comparators All at constant currency Organic revenue growth Operating margin +6% Current acquisitions net of disposals to reported growth +2% c.22.5% FY26 GUIDANCE 02 FINANCIAL PERFORMANCE Continuing compounding outcomes H1 H1H2 H2 2025 2026
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19 DIPLOMA PLC FULL YEAR RESULTS 2025 OUR FINANCIAL MODEL AMBITION… 02 FINANCIAL PERFORMANCE Sustainable quality compounding * At constant currency …WITH DISCIPLINE Organic revenue growth is our first priority 5% Total revenue growth accelerated by quality acquisitions* 10% Value-add drives strong operating margins 20%+ Compounding EPS growth Double digit Capital-light business model drives strong cash conversion 90% Capital stewardship focused on strong returns High teens Balance sheet discipline maintains prudent leverage <2.0x Return to shareholders with a progressive dividend 5%
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20 DIPLOMA PLC FULL YEAR RESULTS 2025 STRATEGY AND BUSINESS REVIEW
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21 DIPLOMA PLC FULL YEAR RESULTS 2025 A CLEAR STRATEGY FOR GROWTH 03 STRATEGY AND BUSINESS REVIEW Deliver value responsibly SCALE GROW Organic growth in 3 buckets: Complementary acquisitions to drive future organic growth Value-add business model at scale Powerful decentralised Group at scale PRODUCT EXTENSION03END MARKET EXPOSURE01 GEOGRAPHIC EXPANSION02
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22 DIPLOMA PLC FULL YEAR RESULTS 2025 ATTRACTIVE GROWTH MARKETS SOME EXAMPLES…. 03 STRATEGY AND BUSINESS REVIEW EXPLORATORYESTABLISHED EARLY STAGE Supporting long-term structural growth Aerospace Defence Infrastructure IVD Datacentres Automation Clean energy Scientific Water Energy storage Nuclear
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23 DIPLOMA PLC FULL YEAR RESULTS 2025 SIGNIFICANT “WHITE SPACE” US CANADA UK&I GERMANY FRANCE SPAIN OTHER EU ANZ CURRENT ADDRESSABLE MARKET CONTROLS Wire & cable Interconnect Specialty fasteners Specialty adhesives Industrial automation SEALS Seals Gaskets Hoses & fittings Pumps & valves LIFE SCIENCES IVD Medtech Scientific GROWING ADDRESSABLE MARKET New product verticals Market share Significant Moderate Small White space 03 STRATEGY AND BUSINESS REVIEW
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24 DIPLOMA PLC FULL YEAR RESULTS 2025 TARGETED ACQUISITIONS ACCELERATE GROWTH HEALTHY ACQUISITION PIPELINE 03 STRATEGY AND BUSINESS REVIEW STRONG TRACK RECORD 48 Acquisitions £1.4bn Invested +20% Return on capital FY19 - present Long term pipeline >4,000 Active opportunities >50 Average size by enterprise value c.£25m Well diversified (by number of opportunities) By sector By geography Seals Controls Life Sciences N. America Europe Australia UK & Ireland
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25 DIPLOMA PLC FULL YEAR RESULTS 2025 A BUYER OF CHOICE 03 STRATEGY AND BUSINESS REVIEW
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26 DIPLOMA PLC FULL YEAR RESULTS 2025 CONTROLS: EXCELLENT PERFORMANCE 03 STRATEGY AND BUSINESS REVIEW 41% Wire & cable 17% Interconnect solutions 37% Specialty fasteners 3% Industrial automation 2% Specialty adhesives * Pro forma revenue adjusted for acquisitions and disposals completed during the period FY25 FY24 Change Revenue £836.4m £652.4m +28% Organic growth +20% +10% Adjusted operating profit £250.6m £169.9m +47% Adjusted operating margin 30.0% 26.0% +400bps • Windy City Wire: Double-digit growth. Growing exposure to datacentres • International Controls: Double-digit growth. Attractive market exposure • Exceptional Peerless performance • Four acquisitions – increasing aerospace & defence exposure • Positive outlook FY25 HIGHLIGHTS 62% North America 16% Europe 16% United Kingdom 6% Australasia / other ATTRACTIVE GROWTH MARKETS: Datacentres Energy storage Aerospace Defence PERCENTAGE OF GROUP REVENUE * 55% SECTOR REVENUE MIX
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27 DIPLOMA PLC FULL YEAR RESULTS 2025 PEERLESS: EXCEPTIONAL PERFORMANCE Exceptional year. Positive outlook 03 STRATEGY AND BUSINESS REVIEW POSITIVE OUTLOOK AND ATTRACTIVE LONG TERM PROSPECTS ATTRACTIVE MARKET DYNAMICS STRONG MODEL AND EXCELLENT LEADERSHIP
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28 DIPLOMA PLC FULL YEAR RESULTS 2025 SEALS: SEQUENTIAL IMPROVEMENT 03 STRATEGY AND BUSINESS REVIEW FY25 FY24 Change Revenue £456.0m £489.1m (7%) Organic growth +2% +1% Adjusted operating profit £88.1m £90.7m (3%) Adjusted operating margin 19.3% 18.5% +80bps • Sequential improvement in H2 • North America: Strong recovery in H2 • International: Europe recovered well. UK remains tough • Investment in talent – well positioned • Portfolio discipline – small disposals impacted reported performance • Positive outlook FY25 HIGHLIGHTS * Pro forma revenues adjusted for acquisitions and disposals completed during the period ATTRACTIVE GROWTH MARKETS: Water treatment Nuclear Clean energy PERCENTAGE OF GROUP REVENUE * SECTOR REVENUE MIX 29% 46% Seals 19% Hoses & fittings 27% Gaskets 8% Pumps & valves 45% North America 20% Europe 23% United Kingdom 12% Australasia / other Infrastructure
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29 DIPLOMA PLC FULL YEAR RESULTS 2025 LIFE SCIENCES: MARKET OUTPERFORMANCE 03 STRATEGY AND BUSINESS REVIEW FY25 FY24 Change Revenue £232.1m £221.9m +5% Organic growth +6% +6% Adjusted operating profit £45.3m £46.8m (3%) Adjusted operating margin 19.5% 21.1% (160bps) • Strong growth in Canada, Australia and New Zealand • Improving product portfolio in Europe • Two acquisitions • Positive outlook in challenging healthcare market FY25 HIGHLIGHTS * Pro forma revenues adjusted for acquisitions and disposals completed during the period ATTRACTIVE GROWTH MARKETS: In Vitro Diagnostics PERCENTAGE OF GROUP REVENUE * SECTOR REVENUE MIX 16% 42% IVD 4% Scientific and other 39% North America 18% Australasia 54% Medtech 43% Europe inc. UK Scientific
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30 DIPLOMA PLC FULL YEAR RESULTS 2025 DELIVERING SUSTAINABLE QUALITY COMPOUNDING We’re just getting started 03 STRATEGY AND BUSINESS REVIEW VERY STRONG PERFORMANCE AMBITION WITH DISCIPLINE STRONG PORTFOLIO IN ATTRACTIVE MARKETS COMPOUNDING ACQUISITIONS POSITIVE MOMENTUM INTO FY26
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31 DIPLOMA PLC FULL YEAR RESULTS 2025 APPENDIX
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32 DIPLOMA PLC FULL YEAR RESULTS 2025 CONSISTENT STRONG PERFORMANCE Seven-year trends 7yr average FY25 FY24 FY23 FY22 FY21 FY20 FY19 Reported revenue growth +18%1 +12% +14% +19% +29% +46% (1%) +12% Organic revenue growth +7% +11% +6% +8% +15% +12% (7%) +5% Adjusted operating margin 19.3% 22.5% 20.9% 19.7% 18.9% 18.9% 16.2% 17.8% Adjusted EPS growth +18%1 +21% +15% +18% +26% +51% (12%) +14% Free cash conversion 99% 105% 101% 100% 90% 103% 113% 78% Return on capital2 19.3% 20.9% 19.1% 18.1% 17.3% 17.4% 19.1% 22.9% Leverage ratio3 0.8x 0.8x 1.3x 0.9x 1.4x 1.1x 0x 0.1x Dividend growth 14% 5% 5% 5% 26% 42% 3% 14% 1 7-year CAGR | 2 Return on Adjusted Trading Capital Employed (ROATCE) | 3 Net debt / EBITDA 04 APPENDIX
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33 DIPLOMA PLC FULL YEAR RESULTS 2025 INCOME STATEMENT Year ended 30 September £m FY 25 FY 24 Change Revenue 1,524.5 1,363.4 +12% Adjusted operating profit 342.7 285.0 +20% Operating margin (%) 22.5% 20.9% Financial expense, net (27.3) (27.0) Profit before tax 315.4 258.0 +22% Effective tax rate 25% 24% Minority interests (0.6) (0.7) Adjusted earnings 236.0 195.4 +21% Weighted average no. shares (m) 134.1 134.0 Adjusted earnings per share 176.0p 145.8p +21% Total dividend per share 62.3p 59.3p +5% All profit metrics are adjusted and stated before acquisition related and other charges and acquisition related finance charges
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34 DIPLOMA PLC FULL YEAR RESULTS 2025 SECTOR REVENUE AND PROFIT 04 APPENDIX Adjusted operating profit Adjusted operating margin FY 25 £m FY 24 £m Change FY 25 % FY 24 % Change Controls 250.6 169.9 +47% 30.0 26.0 +400bps Seals 88.1 90.7 -3% 19.3 18.5 +80bps Life Sciences 45.3 46.8 -3% 19.5 21.1 -160bps Central costs (41.3) (22.4) -84% - - - Group 342.7 285.0 +20% 22.5 20.9 +160bps Revenue Organic growth FY 25 £m FY 24 £m Change FY 25 % FY 24 % Controls 836.4 652.4 +28% +20 +10 Seals 456.0 489.1 -7% +2 +1 Life Sciences 232.1 221.9 +5% +6 +6 Group 1,524.5 1,363.4 +12% +11 +6
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35 DIPLOMA PLC FULL YEAR RESULTS 2025 BALANCE SHEET 04 APPENDIX £m, as at 30 September FY25 FY24 Goodwill and acquisition intangible assets 1,042.6 1,048.9 Tangible, other intangible, and other financial assets 71.2 66.0 Net lease liabilities (7.7) (6.4) Net working capital 245.7 276.5 Trading capital employed 1,351.8 1,385.0 ROATCE 20.9% 19.1% Retirement benefit assets, net 1.7 1.5 Acquisition liabilities and assets, net (24.7) (23.6) Net debt (299.4) (419.6) Minority interests and deferred tax, net (39.7) (55.3) Total shareholders’ funds (excluding minority interests) 989.7 888.0
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36 DIPLOMA PLC FULL YEAR RESULTS 2025 DELIVERING VALUE RESPONSIBLY CLIMATE ACTION 04 APPENDIX WASTE REDUCTION Scope 1 & 2 emission intensity (tCO2e/ £1mill) Waste sent to landfill FY21 NA FY22 60% FY23 32% FY24 23% FY25 18% FY21 NA FY22 7.6 FY23 7.6 FY24 5.7 FY25 3.1 DIVERSITY, EQUITY & INCLUSION COLLEAGUE ENGAGEMENT Women in senior management team Employee Survey scores FY21 79% FY22 79% FY23 80% FY24 79% FY25 78% FY21 24% FY22 27% FY23 28% FY24 30% FY25 32% SUPPLY CHAIN DOING BUSINESS RESPONSIBLY HEALTH & SAFETY Key suppliers aligned to our supplier code Lost time incident frequency rate FY21 NA FY22 3.4 FY23 3.0 FY24 3.6 FY25 2.9 FY21 NA FY22 59% FY23 73% FY24 90% FY25 89% DELIVERING FOR THE ENVIRONMENT DELIVERING FOR OUR PEOPLE