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HBR Template Version 1_April 2025 Investor Presentation Harbour Energy plc September 2026
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HBR Template Version 1_April 2025 Harbour Energy | Disclaimer Investor presentation IMPORTANT NOTICE: THIS PRESENTATION AND ITS CONTENTS ARE CONFIDENTIAL AND ARE BEING SUPPLIED TO YOU FOR YOUR INFORMATION ONLY AND ARE NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY TO ANY OTHER PERSON. BY ACCESSING THIS DOCUMENT YOU AGREE TO BE BOUND BY THE FOREGOING. THIS PRESENTATION IS NOT AN OFFER OR THE SOLICITATION OF AN OFFER TO SUBSCRIBE FOR OR PURCHASE ANY SECURITIES. This presentation has been prepared by Harbour Energy plc (the “Company”) for general information purposes in relation to its half-year results and may contain forward-looking statements, estimates, and projections regarding the results of operations, financial condition, business plans, strategy and performance of the Company and its subsidiaries (the “Group”). Forward-looking statements are sometimes, but not always, identified by their use of a date in the future or such words and words of similar meaning as "ambition", "anticipates", "aspire", "aims", "due", "could", "may", "will", "should", "expects", "believes", "intends", "plans", "potential", "targets", "goal" or "estimates". Such statements are based on current expectations, assumptions and beliefs and are subject to a number of risks and uncertainties. Although the Group believes that the expectations reflected in such forward-looking statements are reasonable, these statements are not guarantees of future performance and actual results, performance or events may differ materially from those expressed or implied by such forward-looking statements. No representation or warranty is made as to the accuracy or completeness of any forward-looking statements, and undue reliance should not be placed on them. Past performance is not indicative of future results. Nothing in this presentation should be construed as a profit forecast or estimate. The information in this presentation reflects the Group’s views and intentions as of the date of its preparation and has not been independently verified. Except as required by applicable law, regulation, or the requirements of any recognised stock exchange the Group undertakes no obligation to update or revise any forward-looking statements or other information in this presentation. This presentation does not constitute or form part of any offer or invitation to sell, issue, or subscribe for, or any solicitation of any offer to purchase or subscribe for, any securities of the Company or any member of the Group, nor shall it or any part of it, or the fact of its distribution, form the basis of or be relied upon in connection with any contract, commitment, or investment decision. Certain financial and operational information contained in this presentation has not been audited or reviewed and may be based on internal records and management estimates and may be subject to further review, amendment, or change.No reliance shall be placed on, and no person shall be liable in any way in respect of, such information. This information includes certain operational and financial measures not presented in accordance with IFRS and, therefore, are not measures of financial performance in accordance with IFRS and may exclude items that are significant in understanding and assessing the Company’s financial results or future prospects. These measures should not be considered in isolation or as alternative performance measures under IFRS. Market, industry, and competitive position data in this presentation may come from external sources or the Group’s own internal estimates and analysis. While the Group believes these sources to be reliable, it has not independently verified the data and makes no representation as to its accuracy or completeness. To the fullest extent permitted by law, neither the Company nor any of its affiliates, directors, employees, officers, or advisers accepts any responsibility or liability whatsoever for any loss howsoever arising from any use of, or reliance upon, this presentation or its contents or otherwise arising in connection with it 1
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HBR Template Version 1_April 2025 H1 2026 Highlights
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HBR Template Version 1_April 2025 Harbour Energy | Half-year Results Why Harbour Energy? A track record of strategic, operational and financial delivery supported by active portfolio management and a world-class team A large-scale, diverse producing asset base with a competitive cost structure and exposure to Brent oil prices and European gas prices Production maintained at 475-500 kboepd to end of decade supported by high return projects in our c.18 years of organic inventory Significant and sustainable free cash flow generation, rigorous capital discipline, investment grade credit Returns-focused with attractive distributions policy enabling deleveraging and reinvestment while ensuring shareholders benefit from our material cash flow Investor presentation 3
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation 2014 2017 2019 2021 2024 2025 H126 2026 2027 2028 2029 2030 H1 2026 Highlights Leveraging our scale, diverse asset base, established track record and world-class team to create value ▪ Sustaining production at scale ▪ Building a competitive portfolio ▪ Ensuring financial resilience ▪ Competitive shareholder returns Growth & diversification Resilience & longevity Production, WI kboepd 500 Continued execution of our strategy Production shifting to lower-cost, lower tax-basins with significant running room 509 4
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HBR Template Version 1_April 2025 Harbour Energy | H1 2026 Highlights ▪ Excellent operational performance with record production, high reliability and strong project execution; upgraded full- year production guidance ▪ Portfolio strengthened through LLOG (US) and Waldorf (UK) acquisitions and divestment of non-core assets in Indonesia ▪ Significantly increased free cash flow, accelerating debt reduction and delivery of material additional shareholder returns Investor presentation 509 kboepd H1 2026 Record production $1.8bn H1 2026 Free cash flow $400m 2026 Interim dividend & buyback Record production and improved outlook; new $250 million share buyback announced Leon-Castile, Salamanca FPS, US Gulf of America 5
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HBR Template Version 1_April 2025 Operational review
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HBR Template Version 1_April 2025 Harbour Energy | Operational priorities Norway: High-quality production underpinned by high-value, near- term projects UK: Diverse, cash generative portfolio with high degree of operational control Investor presentation US: Fully operated, oil- weighted growth platform with high-margin barrels and long reserve life Mexico: Operated large offshore oil discoveries providing growth options Argentina: Long-life production with potential for material growth ▪ Safe and reliable operations ▪ Drive margin expansion and capital efficiency ▪ Profitably convert resources to reserves to production and cash flow Focusing our investment to five core countries 7
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HBR Template Version 1_April 2025 Harbour Energy | 0.7 1.0 1.1 1.5 2023 2024 2025 H1 2026 Prioritising safety in everything we do Investor presentation Occupational Safety TRIR1 (per million hours worked) 20 18 13 13 2023 2024 2025 H1 2026 28% Greenhouse gas emissions intensity3 kgCO2e/boe 1 TRIR stands for Total Recordable Injury Rate 2 Peer data (where available) from Aker BP, Apache, Murphy, Santos, Vår Energi, Woodside and Vista, and sourced from Annual Sustainability and/or ESG Reports. 3 GHGi reported on a net equity share basis. 4 Relates to our operated assets Harbour Peer2 range Peer2 average Peer2 range Peer2 averageHarbour ▪ H1 2026 performance reflects mostly minor personal safety incidents in Norway and process safety incidents onshore Mexico ▪ Significant improvements in both UK and Germany ▪ All incidents are rigorously investigated with learnings shared ▪ Methane intensity remains below target of <0.2%4 ▪ On track to halve gross operated emissions by 2030 (vs 2018 baseline) 8
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation H1 2025 H1 2026 FYF 2026 2026 Production: Strong H1 performance; guidance further narrowed upwards Production WI, kboepd 488 050Norway UK Argentina US Mexico Other Guidance narrowed upwards 490-500 kboepd (from 480-500 kboepd) 509 FYF 2026 Diverse, large-scale production with competitive cost structure and significant Brent and European gas price exposure Liquids Eur. gas Other gas Increased and enhanced production ▪ Addition of high-margin LLOG portfolio (US) more than offsets UK decline and SE Asia exits ▪ Increased production from Norway driven by strong operational / project delivery and subsurface performance ▪ New wells onstream in US, Argentina and Norway ▪ High reliability with operating efficiency of 93% ▪ Operating costs of $13.3/boe 1 Other includes Germany, North Africa and Southeast Asia. 1 9
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HBR Template Version 1_April 2025 Harbour Energy | ▪ Increased production of 180 kboepd, 62% gas (H1 2025: 173 kboepd) ▪ High operating margins: $12/boe opex ▪ Accelerated project delivery with five new developments online in 2026 ▪ Six projects targeted for FID in 2026 with potential to deliver c.100% Norway reserves replacement ▪ Omega Sør discovery; fast tracked for development by operator ▪ Success in Norway licensing round Investor presentation 0 25 50 Maria Phase 2 Solveig Ph 2 Dvalin North Idun N & Alve N Irpa Snøhvit Future Gjøa N & Ofelia Cuvette Adriana Sabina Omega Sør Ærfugl Ph.3 Storjo Bergknapp 2025 Norway: Resilient production and cash flow underpinned by pipeline of high-value, near-term projects Project pipeline 2P reserves and 2C resources, mmboe (net)1 Projects onstream Approved developments Future projects Harbour operated 2030 Start up accelerated Delivered ahead of schedule, below budget 2026 start up 2026 FID targeted 2026 oil discovery <$40/bbl, <$5/mscf average breakeven for oil and gas projects 1 Harbour management estimates at YE 2025 2 Harbour management post drill estimates 2 10
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HBR Template Version 1_April 2025 Harbour Energy | ▪ Significant operational control ▪ Low-cost operator ▪ Successful well intervention activity ▪ Selective high return, short-cycle investments – e.g. Fotla ▪ Optimisation of decommissioning costs Investor presentation UK: Robust free cash flow platform driven by strong operational delivery and Waldorf acquisition 20 18 19.5 2024 2025 H1 2026 149 155 148 2024 2025 H1 2026 Operating costs $/boe Production WI kboepd Completed $163m Waldorf acquisition, enhancing resilience of UK business Adds c.14 kboepd oil-weighed production, c.10% to UK volumes and 25 mmboe 2P reserves1 Increased stake in Catcher, removes distressed partner Delivers significant financial synergies including through the release of >$400m of cash2 1 Est. H2 production and est. reserves at YE25. 2 Primarily cash posted as collateral for future decommissioning and includes cash on Waldorf’s balance sheet resulting from recent higher oil prices 3 Source: NSTA 2025 UK basin average: c.$24/boe3 11
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HBR Template Version 1_April 2025 Harbour Energy | San Roque Aguada Pichana Este CMA-1 Argentina Vaca Muerta Basin SESA LNG Site Río Negro Province Operated by TotalEnergies Operated by SESA2P reserves 2C resources CMA-1 (conventional) APE San Roque 2025 H1 2026 Investor presentation Argentina: Long-life production with potential for material growth ▪ CMA-1: Long-life conventional production with multiple tie-back options ▪ Aguada Pichana Este (Vaca Muerta gas window, Harbour 23%1): ― Nine new gas wells online in H1 2026 ― Continued operational efficiencies driving lower drilling & completion costs ▪ SESA (Harbour 15%) c.6 mtpa LNG project to start up end 2027, enabling access to global markets; RIGI incentives secured ▪ Development of first phase of San Roque black oil (Vaca Muerta, Harbour 25%) targeted to start in 2027 2P & 2C resources YE25, mmboe Production WI kboepd 74 266 722 73 1 Harbour also has a 27% interest in APE Residual, the conventional licence 12
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation 0 25 50 75 H1 2026 2026 2027 2028 2030 Who Dat Buckskin Leon-Castile Other ▪ Fully operated, oil-weighted portfolio ▪ High-margin production growth ▪ Deep inventory of high return (>40% IRR1), low breakeven, infrastructure-led investments ― New wells online at Leon-Castile, Buckskin and Who Dat ― Who Dat East development approval this month ― Kingsroad exploration well to spud around year end ▪ Significant subsurface running room ― New OBN seismic data unlocks additional prospectivity ― Awarded 12 leases (all as operator) in BBG1 & 2 rounds ▪ Supportive fiscal & regulatory environment Production, WI kboepd Gulf of America: Large, long-life deepwater hubs with high-rate wells driving significant free cash flow growth through to 2030 Growing high- margin production to 2030 underpinned by 18-year 2P reserve life3 Production CAGR: >20% (2026-2030) 1Average weighted IRR of US capex (2026-2028) point forward as at 1 January 2026, assuming $60/bbl WTI and $4/mscf Henry Hub. 2 Reflects LLOG production contributing from 1 February, averaged over H1 3 Based on YE 2025 estimated 2P reserves and expected 2026 production 33 2 13
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation ▪ Focus on optimising Zama (Harbour 27%1) and Kan (Harbour 70%) development plans to enhance returns and reduce risk ▪ Capital efficient, phased FPSO-based Zama development plan with wellhead platform ▪ Invitations to tender for major Zama FEED packages issued soon ▪ Partner alignment strengthened by Grupo Carso’s increased participation in both projects ▪ Both Zama and Kan expected to be FID ready in late 2027 Mexico: Building a scaled and advantaged business around our operated shallow water Zama and Kan oil fields Zama 2P 2C Zam a Kan 2P reserves & 2C resources YE25, mmboe (net) 40 Zama and Kan could add reserves equal to two years of Harbour’s production2 375 1 Post divestment of 5% interest to Grupo Carso which is expected to complete around year end 2026. 2 Based on 475-500 kboepd and Zama and Kan booked 2P reserves as at YE 2025 proforma 5% sale in Zama to Grupo Carso Zama Phase 1 14
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation 0.0 0.5 1.0 1.5 2.0 2.5 2025 2026 2027 2028 2030 Strict capital discipline $2.0-2.3bn p.a. (2027-30) Total capex $bn Norway UK Argentina US Mexico Other 0 100 200 300 400 500 2025 2026 2027 2028 2030 Production WI, kboepd 2026 Guidance 490-500 kboepd Growing higher margin production Maintain 475-500 kboepd (2027-30) Delivering our highest return, most competitive projects to drive higher margin production ▪ Near-term spend focused on high value, short-cycle projects ▪ LLOG acquisition further high-grades the portfolio ▪ Operational control supports significant optionality longer term ▪ Increasing volumes in US, new production in Norway and Argentina and – over time – in Mexico offset decline in higher cost and tax UK 2026 Guidance $2.2-2.4bn 15
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HBR Template Version 1_April 2025 Financial review
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HBR Template Version 1_April 2025 Harbour Energy | H1 2026 Financial highlights Free cash flow $1.8bn (H1 2025: $1.4bn) Share buyback announced $250m (H1 2025: $100m) Leverage (Net debt / EBITDAX) 0.7x (31 December 2025: 0.6x) Harbour Energy | Investor presentation Adjusted earnings per voting ordinary share 28 cents (H1 2025: 22 cents) ▪ Strong financial results driven by operational excellence and diverse portfolio with significant exposure to Dated Brent and European gas prices ▪ Increased free cash flow outlook resulting in accelerated debt reduction and delivery of material shareholder returns ▪ Enhanced scale and portfolio quality increasing market relevance and lowering the cost of capital Investor presentation 17
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HBR Template Version 1_April 2025 Harbour Energy | Against a volatile backdrop, Harbour well positioned BRENT ($/BBL) TTF ($/mscf) Large scale and diverse portfolio Significant exposure to Dated Brent and European gas prices Norway, UK and US oil volumes realised $93/bbl (pre-hedge) during H1 Additional hedges secured via zero cost collars with attractive skews, especially for Euro gas For H2 2026 hedged c.50% of Brent/WTI and 65% of Eur. gas economic exposure at average price floor-cap of $69-80/bbl and $11-15/mscf, respectively0 25 50 75 100 125 150 0 5 10 15 20 25 30 Investor presentation Dated Brent ICE Brent future | Pre-hedge Post-hedge H1 2025 H2 2025 |H1 2026| |H1 2025 H2 2025 H1 2026| 72 Semi-annual average 9266 14.710.713.1 14.069 90 15.0 71 13.4 14.484 Harbour realised oil prices, $/bbl H1 2025 Harbour realised Euro gas prices, $/mscf H1 2026 H1 2025 H1 2026 Henry HubTTF | 18 18
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation 0.8 2.2 1.6 4.5 1.0 0.2 1.5 0.2 2.3 2.5 0.6 Cash YE25 Gross op. cash flow Total capex Net finance & lease costs Tax payments Shareholder returns Debt drawdowns Net M&A movements Debt repayments Cash HY26 Significant cash flow generation Reflects strong operational performance, leverage to oil and European gas prices and H2 weighting of tax payments $ billion Free cash flow $1.8 billion (H1 2025: $1.4bn) Reflects remaining 2025 UK/Norway tax liability; 2026 tax liability paid in H2 2026 & H1 2027 Significant liquidity of $4.1 billion (31 Dec 2025: $3.1bn)1 2 1 Excludes amounts held in escrow 2 Includes LLOG headline $2.7bn cash consideration less cash acquired and deposit paid, Indonesia disposal proceeds c.$0.1bn; add M&A related fees $0.1bn 1 19
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation Accelerated deleveraging following completion of the LLOG acquisition 4.4 2.7 5.4 0.2 Net debt YE25 LLOG acqn H1 FCF Shareholder distributions M&A / other Net debt 30 June Net debt1,2 $bn Includes final 2025 dividend and remainder of 2025 share buyback Includes Indonesia proceeds, M&A fees, hybrid interest and FX effects ▪ Leverage of 0.7x at 30 June; strong EBITDAX and free cash flow helped offset impact of $2.7bn LLOG acquisition-related debt ▪ Successfully refinanced $3.0bn RCF ▪ Maturity extended to 2031 (two extension options) ▪ Materially improved commercial terms, including 0.8% margin1 ▪ Strong syndicate of 18 banks ▪ Repaid $0.6 billion of debt in the period ▪ Post period end, net cash proceeds from Waldorf transaction of c.$0.3bn2 directed towards debt reduction ▪ Investment grade credit ratings Owing to rounding, totals do not match the sum of the component parts 1 Reflects $1.14/€ at 30 June 2026 and $1.175/€ at 31 December 2025 2 Pre-swap; net debt excludes unamortised fees and impact of cross currency swaps and includes amounts held in escrow 1 Subject to certain currency funding premiums and credit adjusted spread (CAS) for cash drawings 2 Cash including that posted as collateral against future decommissioning liabilities net of $163m proceeds 1.8 0.1 20
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HBR Template Version 1_April 2025 Harbour Energy | Delivering competitive shareholder returns Return 45-75% of free cash flow, including 16.10 cents/share1 ($300m)2 minimum annual dividend 2026 interim dividend of 8.05 cents/share1; new $250m share buyback announced Based on $1.8bn FCF, at least $800m of distributions for 2026 ▪ $300m annual dividend ▪ $500m of additional returns, starting with $250m buyback Shareholder authority to buyback shares directly from BASF 0.6 1.4 1.4 1.3 1.3 1.8 FCF outlook (March 26) FCF outlook (May 2026) Production FX effects & working cap Commodity prices FCF outlook (August 26) Increased 2026 free cash flow outlook and shareholder returns Investor presentation Free cash flow outlook $bn 1 FY26 Dated Brent of $65/bbl and Eur. gas prices of $11/mscf 2 FY26 Dated Brent $80/bbl and $13/mscf 3 FY 26 Dated Brent c.$85/bbl and c.$15/mscf. 4 March / May outlook assumes $1.35/£, $1.15/€ and NOK10/$. August outlook at $1.35/£, $1.15/€ and NOK9.5/$ FY 2026 FCF sensitivity +$5/bbl FY Brent: +$170m +$1/mscf FY EU gas: +$150m 3x Reflects higher production and H2 commodity prices of $80/bbl & $16/mscf 1,4 2,4 3,4 1 Voting ordinary share 2 Includes $46m to be paid on non-voting shares 21
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HBR Template Version 1_April 2025 Guidance and outlook
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation Improved 2026 production & free cash flow outlook 2026 FY 2026 (March 2026)1 FY 2026 (May 2026)1 H1 2026 Actuals2 FY 2026 (August 2026)3 FY 2026 (Aug. vs May) Production kboepd 475-500 480-500 509 490-500 Unit opex $/boe c.14.5 c.14.5 13.3 c.14.5 Total capex4 $bn 2.2-2.4 2.2-2.4 1.0 2.2-2.4 Dated Brent $/bbl 65 80 92 c.85 (H2: 80) Euro gas (TTF, NBP) $/mscf 11 13 14.7 c.15 (H2: 16) Free cash flow5 $bn 0.66 1.46 1.8 c.1.86 FY 2026 FCF sensitivity: +$5/bbl FY 2026 Brent: +$170m +$1/mscf FY 2026 Eur. gas: +$150m 1 At $1.35/£, $1.15/€ and NOK 10/USD 2 At $1.35/£, $1.17/€ and NOK 9.5/USD 3 At $1.35/£, $1.15/€ and NOK 9.5/USD. 4Includes decommissioning 5 FCF is post tax and pre distributions, M&A and hybrid interest. 6 Reflects mid point of guidance 92 80 H1 H2 509 H1 H2 1.0 H1 H2 1.5 H1 H2 Dated Brent, $/bbl Production, kboepd Capex, $bn H2 FCF impacted by tax payments as well as lower oil prices & production & higher capex 470-490* Tax payments, $bn 1.2-1.4 2.3-2.5 * av H2 production required to reach low/high end of FY guidance 23
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HBR Template Version 1_April 2025 Harbour Energy | Outlook: delivering against our capital allocation priorities 1 March outlook reflects 2026 FCF of $0.6bn; August outlook reflects 2026 FCF of $1.8bn and new $250m buyback completed by YE26. 2 March outlook assumes FY26 Dated Brent $65/bbl and $11/mscf European gas. August outlook assumes H2 2026 Dated Brent $80/bbl and $16/mscf European gas (equiv. to c.$85/bbl Dated Brent and c.$15/mscf European gas for FY 2026). 3 16.10 is per voting ordinary share; $300m incl. $46m minimum annual dividend paid on non-voting ordinary shares ▪ Sustain 475-500 kboepd production ▪ Maintain <$15/boe operating costs ▪ Invest $2.0-2.3bn capex pa from 2027 Robust & diverse portfolio Competitive shareholder returns ▪ 45-75% free cash flow payout ▪ 16.10 cents/sh ($300m) dividend3 ▪ Potential for additional returns ▪ Investment grade credit profile ▪ Target <1.0x leverage through cycle Investment grade balance sheet1 2 3 Investor presentation 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 1 2 3 4 5 6 March outlook August outlook c.0.6 c.1.8 March outlook August outlook YE 2026 Net debt, Leverage1 $ billion 2026 Free cash flow2 $ billion March outlook August outlook 0.3 0.3 c.0.5 c.0.8 2026 distributions3 $ billionLeverage <1x at YE26 but 2027 leverage impacted by tax lag effect 1x leverage Min. annual dividend Additional shh returns >2.5x Net debt Leverage >3x Capital allocation priorities 24
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HBR Template Version 1_April 2025 Closing remarks
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HBR Template Version 1_April 2025 Harbour Energy | Half-year Results Why Harbour Energy? A track record of strategic, operational and financial delivery supported by active portfolio management and a world-class team A large-scale, diverse producing asset base with a competitive cost structure and exposure to Brent oil prices and European gas prices Production maintained at 475-500 kboepd to end of decade supported by high return projects in our c.18 years of organic inventory Significant and sustainable free cash flow generation, rigorous capital discipline, investment grade credit Returns-focused with attractive distributions policy enabling deleveraging and reinvestment while ensuring shareholders benefit from our material cash flow Investor presentation 26
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HBR Template Version 1_April 2025 Appendix
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HBR Template Version 1_April 2025 Harbour Energy | ▪ One of the largest oil and gas producers in Germany ▪ High degree of operational control ▪ 100% op. interest in Mittelplate, Germany’s largest oil field ▪ Ongoing infill drilling programme ▪ Optimisation of decommissioning costs with learnings applied from UK business Investor presentation Germany: Stable, high margin production with long reserve life and low emissions 28 28 0 30 2025 H1 2026 2026 2030 Production WI kboepd 98% Operating efficiency H1 2026 11 years 2P reserve life1 1 YE 2025 2P reserves divided by 2026F production Stable production 28
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HBR Template Version 1_April 2025 Harbour Energy | ▪ Long-established presence & strong in-country relationships ▪ Four production hubs: West Nile Delta (WND) & Disouq, Egypt; Reggane Nord, Algeria; and Al Jurf, Libya ▪ Recent discoveries at WND (Fayoum, El King) and Disouq (EZZ) – short-cycle development tie-ins to existing infrastructure ▪ Improved PSC terms at Disouq (100%, op.) – additional acreage, higher production interest, improved gas price ▪ Egyptian govt. overdue receivables reduced to zero in H1 2026 Investor presentation North Africa Stable, low-cost production supported by near-field discoveries and improved licence terms 28 31 0 30 2025 H1 2026 2026 2030 Production WI kboepd <$6/boe Opex 2026-2030 3 months EZZ discovery to first gas Stable production 29
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation Greensand Future ▪ Harbour operator 40%, Ineos 40%, Nordsøfonden 20% ▪ 115 mt gross CO2 storage ▪ Located near key Danish industries ▪ Seismic acquisition completed Q1 2026; appraisal well spudded Q3 2026 ▪ Strong Danish government support ▪ Ineos operator (40%), Harbour 40%, Nordsøfonden 20% ▪ Reuse of existing offshore infrastructure ▪ FID end 2024; start up Q3 2026 ▪ Injection rate of c.400 ktpa ▪ Defers decommissioning by 8 years ▪ EU grant award1 supporting construction ▪ Harbour 60% operator, bp 40% ▪ >400 mt CO2 gross storage ▪ Located in UK’s industrial centre ▪ Repurposing 30 mtpa LOGGS pipeline ▪ UK government funding secured to FID2 Short-cycle, low capital intensity Cost competitive, onshore licence Greenstore Viking Large scale, cost competitive 1 CCS: Building a competitive CCS business, offering the potential for long-term stable cash flow Leading CO2 storage position in Europe 1 2 30
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation 2P 2C 1 YE 2025, Proforma LLOG acquisition (completed 11 February 2026) and Waldorf and Indonesia transactions Large and diverse 2C resource base underpinning material, sustainable cash flow 31 2P reserves and 2C resources1 bnboe Major, offshore growth projects (c.600 mmboe) High value, short cycle projects (c.700 mmboe) ▪ Material positions in large oil discoveries in Mexico and in a multi-TCF gas play in Indonesia ▪ Appointed operator of c.750 mmboe gross Zama; agreed to divest 5%, retaining 27.3% ▪ Optimising development concepts at Harbour operated Zama & Kan (Mexico) ahead of entering FEED ▪ Infill drilling, tie-backs to infrastructure, mainly in Norway, US and UK ▪ Targeting FID of Who Dat East (US), Cuvette, Adriana/Sabina (Norway) and Fotla (UK) developments in 2026 ▪ Recent 2C adds include Fotla (UK) and Omega Sør (Norway) Maturing the highest return, most competitive projects within our disciplined financial framework Norway UK Argentina Mexico Other 1.9 1.4 ▪ At APE, maturing future drilling locations, improving drilling efficiency and debottlenecking ▪ SESA, 6 mtpa LNG project: construction underway, RIGI incentives secured, Phase 1 due to start up end 2027 ▪ San Roque unconventional oil licence discussions ongoing; 16 well programme to start 2027 Vaca Muerta, Argentina (c.600 mmboe) Key focus maturing 2C into 2P US 31
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HBR Template Version 1_April 2025 Harbour Energy | 0 0.5 1 1.5 YE 2017 YE 2021 YE 2025 Production LLOG/ Waldorf acqns Organic additions YE 2028 GoA Mexico Argentina Other Continuing our strong track record of reserve replacement 150% YE17-YE21 250% YE21-YE25 >100% reserve replacement ratio YE 2025- YE 2028 Anticipated reserve additions 2026-2028 Short cycle, high return (GoA, Norway), major growth (Mexico) and shale (Argentina) Oil weighted additions with >50% of 2P reserves liquids by 2028 Greater operational control; operate >50% of reserves by 2028 Focus shifts to lower tax, lower cost basins with more running room; GoA, Argentina and Mexico >55% of reserves by 2028 Targeting breakevens of <$40/boe and <$5/mscf 2P reserves bnboe M&A Organic Norway Completed transactions deliver 2P reserves of 150% of est. 2026 production Investor presentation 3232
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation Group realised prices and production kboepd, net Liquids (oil and NGLs) Gas Total Norway 69 112 180 UK 70 78 148 Argentina 6 68 74 US* 30 3 33 Mexico 9 1 10 North Africa 4 26 31 Germany 19 10 28 SE Asia - 4 5 Total 206 303 509 Group production H1 2026 Owing to rounding, totals do not match the sum of the component parts * Reflects LLOG production contributing from 1 February 2026, averaged over H1 2026 Oil ($/bbl) HBR pre-hedge 90 HBR post-hedge 84 NGLs ($/bbl) Group NGLs 49 Liquids (oil & NGLs, $/bbl) HBR pre-hedge 84 HBR post-hedge 79 EU gas ($/mscf) HBR pre-hedge 15.0 HBR post-hedge 14.4 Other gas ($/mscf) Other 3.6 H1 2026 realised prices Total 173 161 75 - 10 32 29 9 488 H1 2025 33
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation Hedging schedule Reflects transacted volumes rather than post tax / economic exposure. Collar ranges reflect the volume weighted average of put and call options respectively. Group totals reflect volume weighted average of traded swap/fixed price and, for collar structures, the forward curve at 30 June 2026 if forward curve pricing is between the cap and the floor or the floor/cap price if forward curve pricing is outside collar range. H2 2026 FY2026 FY 2027 FY 2028 Transacted volume Average price Transacted volume Average price Transacted volume Average price Transacted volume Avg price EU/UK gas kboepd $/mscf kboepd $/mscf kboepd $/mscf kboepd $/mscf Swaps 59 11.2 59 11.6 20 10.4 7 8.7 Collars (put-call) 28 11.6-20.2 26 11.5-20.3 28 8.9-15.8 6 8.1-15.0 Group 87 12.5 86 12.7 49 11.4 13 9.1 Brent/WTI kboepd $/boe kboepd $/boe kboepd $/boe kboepd $/boe Swaps 44 72 44 72 9 67 5 65 Collars (put-call) 24 65-95 19 64-93 38 60-83 11 58-76 Group 68 72 62 75 46 70 16 68 As at 30 June 2026. Owing to rounding, totals do not match the sum of the component parts 34
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HBR Template Version 1_April 2025 Harbour Energy | Cash tax payment schedule and sensitivity Investor presentation 0.0 1.0 2.0 3.0 H1 2026 H2 2026 H1 2027 Tax liability payment schedule: Norway: 10 instalments, 50% paid in H2 of current year and 50% in H1 of the following year, with no payments in January or July. UK: 3 instalments, 67% paid in H2 of current year and 33% in H1 of the following year. 2026 2027 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Norway UK 2025 liability paid Norway 2026 liability payable Norway Norway and UK cash tax payments $bn $65/11 (March outlook) $80/16 (August outlook) 2025 liability paid H2 2026 prices Est. 2026 liability payable 2025 liability paid UK 2026 liability payable UK Est. 2026 liability payable Approximately 60% of Harbour’s tax liability is paid in H2 of current year with 40% paid in H1 the following year 35
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HBR Template Version 1_April 2025 Harbour Energy | Investor presentation Income statement $ million H1 2026 H1 2025 Reported Adjusts Adjusted1 Reported Adjusted1 Total Revenue and other income 6,408 - 6,408 5,271 5,271 Operating costs and G&A2 (2,045) 102 (1,943) (1,395) (1,383) EBITDAX 4,363 102 4,465 3,876 3,888 Depreciation (1,547) - (1,547) (1,544) (1,544) Impairments, exploration write off (56) 27 (29) (311) (125) Operating profit 2,760 129 2,889 2,021 2,219 Net financial items3 (407) 7 (400) (386) (193) Profit before tax 2,353 136 2,489 1,635 2,026 Income tax expense (1,917) (10) (1,927) (1,809) (1,616) Profit/(loss) after tax 436 126 562 (174) 410 Effective tax rate 81% (4%) 77% 111% 80% Earnings/(loss) per share – cents 21 7 28 (12) 22 Realised post-hedge oil / Eur. gas prices $84/bbl; $14.4/mscf (H1 2025: $71/bbl; $13.4/mscf) Opex/boe $13.3/boe (H1 2025: $12.4/boe) Adjusted profit after tax $0.6bn (H1 2025: $0.4bn) Production 509 kboepd (H1 2025: 488 kboepd) 1 Alternative Performance Measures 2 Includes field operating costs, royalties, over/underlift and M&A fees; see Glossary to financial statements for opex/boe definition 3 Includes net interest, leases, decommissioning discount unwind (see Note 6 to the financial statements) Step up in profitability reflects higher prices and strengthened portfolio 36 36
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HBR Template Version 1_April 2025