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Page 1
Value. Focus. Growth.



PUBLIC EXPOSE 2026
Medco Energi Internasional Tbk (IDX: MEDC, OTCQX: MDCOY)
9 September 2026

Page 2
    Q1 2026 Results

                                                                                                                                                             Highlights                                                                                                                                                          3
                                                                                                                                                             Financial Performance                                                                                                                                               7
                                                                                                                                                             Operational Performance                                                                                                                                         10
                                                                                                                                                             Power & Sustainability                                                                                                                                          12
                                                                                                                                                             Portfolio Growth                                                                                                                                                15
                                                                                                                                                             Appendix                                                                                                                                                        19
East Bali PV




    The following presentation has been prepared by PT Medco Energi Internasional Tbk (the “Company”) and contains certain projections, plans, business strategies, policies of the Company and industry data in which the Company operates in, which could be treated as forward-looking statements within the meaning of
    applicable law. Such forward-looking statements, by their nature, involve risks and uncertainties that could prove to be incorrect and cause actual results to differ materially from those expressed or implied in these statements.

    The Company does not guarantee that any action, which may have been taken. The information presented today is considered Company’s confidential and proprietary, and should not be disclosed, in whole or in part, outside of the Company without appropriate prior approval of Company’s management.

    The use by PT Medco Energi Internasional Tbk of any MSCI Solutions LLC or its affiliates (“MSCI”) data, and the use of msci logos, trademarks, service marks or index names herein, do not constitute a sponsorship, endorsement, recommendation, or promotion of PT Medco Energi Internasional Tbk by MSCI. MSCI services
    and data are the property of MSCI or its information providers, and are provided ‘as-is’ and without warranty. MSCI names and logos are trademarks or service marks of MSCI.



2                                                                                                                                                                                                                                                                                                   Value. Focus. Growth.

Page 3
    Highlights
3                Sarulla Geothermal Power Facilities, North Sumatra   Value. Focus. Growth.

Page 4
    Q1 2026 Operating & Financial Highlights

     Production                Capex             Net Income   Consol. Debt                EBITDA                  Credit Ratings


         169                    90                    67           3.5                      351
                                                                                                                  Fitch
                                                                                                                  S&P
                                                                                                                          : BB-
                                                                                                                          : BB-
                          O&G: 88   Power: 2
       mboepd                USD mn                 USD mn       USD bn                  USD mn                   Moody's : Ba3
                                                                                      RG Net Debt to
     Power Sales            Cash Cost                  ROE       RG Debt                 EBITDA
                                                                                                                   ESG Ratings
                                                                                    1.7x
       1,053                   9.0                      7         2.8               USD 75 per boe

                                                                                                     2.0x
                                                                                                                  MSCI
                                                                                                                  CDP
                                                                                                                               : AAA
                                                                                                                               :B
          GWh             USD per boe               Percent      USD bn                            Mid-cycle at
                                                                                                 USD 65 per boe

     18% YoY production increase                              Strong ESG performance reflected in MSCI AAA rating

     TGI fully repaired                                       Increasing EBITDA

     Successful Oman KSF Simsim NW-01 Khaleel discovery       Disciplined debt management

     Power sales increase from East Bali and ELB expansion    Net Income contributed from Amman USD 33.5 mn
4                                                                                                                        Value. Focus. Growth.

Page 5
Our Business Strategy is Delivering Long-Term Value
    Q1 2026 Production on Track with 2026 Guidance

                                     Oil & Gas                                                         Clean Power                                                     Copper & Gold Mining




         Production                       165-170                              Sales                                     4,550                     Production                      485                        579
         Guidance                                     mboepd                   Guidance                             GWh IPP Power Sold             Guidance Mlbs Copper                                       Koz Gold



               72/28                              46/54                             35         MW
                                                                                                                         25      MWp                   27,670                              66,209
                                                                                   Ijen Geothermal                       East Bali Solar PV                Tonnes                                  Oz
                                                                                   Phase 1                                                              Copper Cathode                        Gold Refined
              % of Gas/Liquids               % of Indexed/Fixed Price                                 Onstream in 2025                                    Smelter & Refining Productions in Q1 2026


         12         Onshore
                    Production Assets          4       Offshore
                                                       Production Assets     6    Operated
                                                                                  Gas-Fired IPPs        2     Operated
                                                                                                              Geothermal IPPs    2   Solar PV
                                                                                                                                     IPPs           ~21%                        Medco’s Ownership
                                                                                                                                                                                Stake in Amman Mineral


          5511                  MMBOE         Net 2P Reserves           1,0532 GWh IPP Power Sold                                                    23.43                Blb         Copper Reserves

         1,1541                 MMBOE
                                              Net Contingent
                                              Resources    Net Contingent
                                                           Resources
                                                                          26%2 Renewable    Mix
                                                                               Installed Capacity Mix
                                                                                        Renewable
                                                                                        Installed Capacity
                                                                                                                                                     32.73                Moz        Gold Reserves
      1) Reserves & Resources position as of 31 Mar 2026                   2) Q1 2026 results and 2025 target achieved                          3) JORC Code compliant reserves estimates as of 31 Dec 2024
5                                                                                                                                                                                                        Value. Focus. Growth.

Page 6
Current Events
    Oman operations unaffected; TGI pipeline repairs completed; Re-entry to Malaysia

                      Medco in the Middle East           TGI Pipeline Ruptured in Jan 2026         Expanding Regional Footprint: Malaysia




    • To date no disruption to MedcoEnergi       • Major pipeline repairs have been          • Similar geology and technical
      personnel, operations, or liftings           completed, gas transmission to Sumatra      characteristics to South Natuna Block B
    • Monitoring ongoing conflict with             and IPP power generation restored         • 4 oil-producing fields - Cendor, East
      appropriate plans in place                 • The interruptions followed TGI pipeline     Cendor, West Desaru, Irama; and 3
                                                   ruptures in January 2026                    DROs1 (Cendor Graben, East Desaru,
                                                                                               Kemasik)
                                                                                             • Current Production is ~7,000 bopd
                                                                                             • Medco 50% (operator)

6    1DRO: Discovered Resource Opportunities                                                                                    Value. Focus. Growth.

Page 7
    Financial Performance
7                           Value. Focus. Growth.

Page 8
    Financial Results
    EBITDA USD 351 mn on 19.2% growth in revenue
    Metric                                                 Q1-26     Q4-25   QoQ %       Q1-26             Q1-25        YoY %
                                                                                                                                     • Q1 oil realized price averaged USD 75.1/bbl, reflecting softer
    Revenue (USD mn)                                     668.3      638.0       4.7     668.3          560.5               19.2
      - Oil and Gas (USD mn)                             616.5      591.1       4.3     616.5          509.7               21.0        prices in Jan-Feb before recovering to USD 94.0/bbl in
      - Power (USD mn)                                     43.4      44.1      (1.7)      43.4             44.4             (2.2)      March
      - Service and Others (USD mn)                           8.4     2.7      >100           8.4           6.4            30.8
    Gross Profit (USD mn)                                231.7      277.9     (16.6)    231.7          229.3                1.1      • Net Income up 282% YoY, primarily driven by AMMN, which
    Gross Profit margin (%)                                34.7      43.5     (20.4)      34.7             40.9
    EBITDA (USD mn)                                      351.1      317.8     10.5      351.1          332.2                5.7
                                                                                                                                       had no sales in Q1 2025 ahead of the smelter ramp-up in late
    EBITDA margin (%)                                      52.5      49.8       5.5       52.5             59.3                        March 2025
    Finance cost (USD mn)                                (81.0)     (81.7)     (0.8)    (81.0)         (79.0)               2.6
    Net Income (USD mn)                                    67.4      15.3     >100       67.4              17.6          282.3       • Gross Profit held broadly flat, up 1.1% YoY, as the Corridor
      - AMMN (USD mn)                                      33.5      89.4     (62.5)      33.5        (29.0)             (215.4)
                                                                                                                                       24% working interest was offset by DD&A from Forel and
                          EBITDA (USD mn)                                        Net Income (USD mn)                                   Terubuk coming on stream
               160                                        169
    163                     152        156
                                               143
                                                                      531                                                            • Oil & Gas Revenue rose YoY on the additional 24% working
96                   78           78                     75
1,593                                     67
                                               72                                                                                      interest in Corridor, new production from Forel and Terubuk
             1,255          1,272      1,264                                   331
                                                                                       367
                                                                                                                                       in South Natuna Block B, and higher oil prices
                                                                                                                                     • Power Revenue down 2% YoY despite a 21% increase in
                                                332       351                                       101
                                                                                                                                67
                                                                                                                                       Power Sales, reflecting the completion of the Ijen and ELB
                                                                                                                   18                  expansion projects in 2025, which generated one-off IPP
2022          2023          2024       2025    Q1 25     Q1 26       2022     2023     2024         2025      Q1 25        Q1 26
                                                                                                                                       Construction Revenues in prior year
             Production (mboepd)               Realized Oil Prize


8                                                                                                                                                                                        Value. Focus. Growth.

Page 9
    Financial Results
    Stronger cash generation cut Gross Debt by USD 126 mn; leverage down to 1.7x

                                                                                                                                                    • Operating Cash Flow up 29.7% YoY, lifted by higher oil
                                                                                                                                                      price and sales volume from the additional 24% working
                                                                                                                                                      interest in Corridor and new production from Forel and
                                                                                                                                                      Terubuk
                                                                                                                                                    • Consolidated Gross Debt down USD 126 mn vs FY 2025,
                                                                                                                                                      primarily reflecting the USD 108 mn redemption of the 2027
                                                                                                                                                      Notes

           Restricted Group (RG) Debt (USD bn)1                                      Cash Flows from Operation (USD mn)
                                                                                                                                                    • RG Net Debt / EBITDA improved to 1.7x from 2.0x at FY
                                                                                                    1,220
                                                                                                                                                      2025, driven by stronger Q1 2026 EBITDA due to higher
                                                                                     1,116                                                            price and sales volume
                   2.4                                                                                       906
                                 2.1
     1.8                                       2.0
                                                   2.0
                                                           1.8           2.0
                                                                                             723                                                    • USD 1.8 bn of committed but undrawn facilities, supported
                         2.1
           1.4                         1.8                       1.7
                                                                               1.7
                                                                                                                                                      by multiple funding options
                                                                                                                                 273
2.7              2.8 2.5       2.7           2.9         2.8           2.8                                             211
       2.1                           2.2           2.4         2.1           2.3


    2022         2023          2024          2025        Q1 25         Q1 26         2022    2023   2024    2025     Q1 25      Q126



           1 Restricted Group, excluding PT Medco Power Indonesia ("MPI") and Services and Others           3 Cash & Cash Equivalent includes Restricted Cash in Banks
9          2 Annualized, excluding MPI and Services and Others
                                                                                                                                                                                                   Value. Focus. Growth.

Page 10
     Operational Performance
10   Belida Platform, Block B, Riau Islands   Value. Focus. Growth.

Page 11
 Oil & Gas Operational Results
 Q1 Production within guidance despite temporary TGI disruptions
     Metric
      `
                                                    Q 1- 2 6      Q4-25   Qo Q %   Q 1- 2 6   Q 1- 2 5   Yo Y %            Oil & Gas Production (mboepd)                                 Oil & Gas Cash Cost1 (USD/boe)
     Daily Production Total (mboepd)                  169          176    (3.8)      169        143      18.1
                                                                                                                                                                                    96
          - Oil (mbopd)                                 47          47    (0.1)        47         39     21.7                                                     169     165-170                   78
                                                                                                                  163       160      152       156                                          78                                  75.1
          - Gas (mmscfd)                              661          699    (5.4)      661        567      16.7                                           143                                                            72.2
                                                                                                                                                                                                                67
          - Gas/Liquids (%)                            72           73                72         73                                                                        50%
     Daily Lifting Total (mboepd)                     156          162    (3.6)      156        133      17.8                                                     122
                                                                                                                  129       128     111        113      104
          - Oil (mbopd)                                 48          48    (1.3)        48         41     17.6
                                                                                                                                                                           20%                                                         < 10
          - Gas (bbtupd)                              627          657    (4.6)      627        532      17.8                                                                               8.3     8.2         8.6     7.9     9.0
                                                                                                                                                                                    6.8
          - Gas/Liquids (%)                            70           70                70         69                                  41        43       39         47      30%
                                                                                                                   34       32
     Oman Service Contract (mbopd)                        9           9   (1.3)          9          9    2.0
     Average realized price                                                                                       2022     2023     2024       2025    Q1 25      Q1 26    FY26     2022 2023 2024 2025 Q1 25 Q1 26 FY26
          - Oil (USD/bbl)1                           75.1          62.6   19.8      75.1       72.2      3.9            Liquids                        Gas                                                Realized Oil Price
          - Gas (USD/mmbtu)                            7.2          6.7    7.8        7.2        7.1     1.4            Indexed Priced Gas             Fixed Priced Gas
     Revenue (USD mn)                                 617          591     4.3       617        510      21.0
          - Gross profit (USD mn)                     203          261    (22.0)     203        210      (3.0)               Oil & Gas Capex2 (USD mn)                                     Net 2P Reserves (mmboe)
          - Gross Profit margin (%)                    33           44                33         41
                                                                                                                                                                              415            539                      564               551
                                                                                                                                                 402
          - EBITDA (USD mn)                           349          329     6.1       349        336      3.8                          365                                           481                   493                   480
                                                                                                                                                                              100
          - EBITDA margin (%)                          57           56                57          66                                             109
                                                                                                                                          93
                                                                                                                              262
                                                                                                                              262
                                                                                                                    231                                                                      355                      440               431
     Metric                                         Q 1- 2 6      Q4-25   Qo Q %   Q 1- 2 6   Q 1- 2 5   Yo Y %                                                                      336                  376                  366
     Cash Cost/boe (USD/boe)1                          9.0          9.3   (3.0)       9.0        7.9     14.5                                                                 315
                                                                                                                                      272        293                 88
                                                                                                                                                             78
     Capex (USD mn)2                                    88         126    (30.7)       88         78     12.2                                                        25
                                                                                                                                                             24                              184
                                                                                                                                                             54      63              146                  117         124      115      120
     Net 2P Reserves (mmboe)                          551          564    (2.3)      551        480      14.6
                                                                                                                   2022      2023    2024       FY25 Q1 25 Q1 26 FY26               2022     2023        2024    2025 Q1 25            Q1 26
                                                                                                                                     Oil & Gas                 Oman 60                                   Liquids     Gas
     1 Cash cost/boe and realized price oil: excluding Oman KSF
11   2 Capex: excluding acquisitions
                                                                                                                                                                                                                            Value. Focus. Growth.

Page 12
     Power & Sustainability
12   East Bali Solar PV, Bali   Value. Focus. Growth.

Page 13
 Power Operational Results
 Renewable Capacity Target achieved; 23% YoY growth in Renewable Sales
     Metric                                      Q1-26    Q4-25   QoQ %     Q1-26   Q1-25   YoY %
                                                                                                                   Gross Power Sales, GWh                      Gross Operating Installed Capacity, MW
     Power Sales (GWh)                          1,053    1,183    (11.0)   1,053    871     20.8
                                                                                                                               4,371                  4,550
       - Renewables (GWh)                        299      295      1.2      299     243     23.1     3,993
                                                                                                             4,155     4,108                                                                3,171             3,173
                                                                                                                                                                                  2,901               3,013
                                                                                                                                                      1,169   2,864     2,851
       - Non-Renewables (GWh)                    754      887     (15.1)    754     628     20.0             801               1,094
                                                                                                     855                831
       - Renewables PoT (%)                       28       25                28      28                                                                                                      1,011            1,013
                                                                                                                                                                                   926                 953
       - Price (¢/kwh)1                           4.1      3.8     6.9       4.1     4.0     2.8                                                               939       926

     Revenue (USD mn)                              43       44    (1.7)       43      44    (2.2)
       - Gross Profit (USD mn)                     26       23    11.0        26      18    45.2             3,353     3,277   3,276                  3,381
                                                                                                     3,138
                                                                                                                                              1,053                               1,975      2,160    2,060   2,161
       - Gross Profit margin (%)                  60       53                60      40                                                 871                   1,925     1,925
                                                                                                                                              299
       - EBITDA (USD mn)                           18       14    23.0        18       9    85.2                                        243
                                                                                                                                        628   754
       - EBITDA margin (%)                        40       32                40       21

     Capex (USD mn)2                                2       14    (87.2)       2      11    (84.5)   2022    2023      2024    2025    Q1 25 Q1 26    FY26    2022      2023      2024      2025      Q1 25   Q1 26
                                                                                                                Gas IPP         Renewables IPP                                        O&M       IPP

                                                                                                                     Power Capex2 (USD mn)                            Gross O&M Power Capacity, MW

                                                                                                              72        71
                                                                                                                                                                                             2,160    2,060   2,161
                                                                                                                                                               1,925     1,925    1,975
                                                                                                                                                                                             365      365     366
                                                                                                                                                                330       330      330
                                                                                                              41        44
                                                                                                      33                       35
                                                                                                      4                        12                                                            1,795            1,795
                                                                                                                                                               1,595     1,595    1,645               1,695
                                                                                                                                       11             15
                                                                                                      29      31        27     23     2 6
                                                                                                                                      1 5
                                                                                                     2022    2023 2024 2025 Q1 25 Q1 26 FY26                    2022     2023      2024      2025     Q1 25   Q1 26
                                                                                                              Gas IPP  Renewables IPP
      Ijen Geothermal, East Java                                                                                                                                                O&M       Renewables O&M

      1 Power price: excluding fuel component
13    2 Capex: net MPI share
                                                                                                                                                                                                 Value. Focus. Growth.

Page 14
 Tracking Our ESG and Climate Commitments
                    E&P Scope 1&2 GHG Emissions1,3, mn tCO2e
                                         30% reduction from Base Year 2019                                                                                                                        AAA
                                                                                    ACHIEVED    .

                                                                                                                                                                                   AA
 5.4         4.8         4.6         4.4         4.2         3.8         3.8          20%                   30%                                A                 A
                                                                                                                                                                                                                                             As of 23 March 2026,
                                                                                                                         BBB                                                                                                    PT Medco Energi Internasional Tbk
 2019       2020        2021        2022        2023        2024        2025          2025                  2030
                                                                                                                                                                                                                              received an MSCI ESG Rating of AAA.
                     E&P Methane Emissions1,3, thousand tCO2e                                                                                                                                                                    MSCI Disclaimer Statement provided in page 2
                                                                                                                        Nov-21              Dec-22              Nov-23             Nov-24 Mar-26
                                         40% reduction from Base Year 2019

                                                                                                                                     ASEAN Risk                                                                       Member of
                                                                                    ACHIEVED                                         Champion
 164
                                                                                                        .




             138          132         134                                                                                            Awards 2025
                                                   99           89             97      25%                   37%
                                                                                                                   MedcoEnergi was named Runner-up in
                                                                                                                   Category 2, recognizing excellence in           CDP - Climate Change             20211 2022 2023                2024           2025
                                                                                                                   integrated risk management to address
2019        2020         2021         2022       2023         2024         2025       2025                  2030   complex business challenges and                MedcoEnergi’s Score                C     B     B                  B              B
                                                                                                                   opportunities.
                         Renewable Mix Installed Capacity2 (%)                                                                                                                     Oil & Gas




                                                                                                                                                                     Performance
                                                                                                                   (Organized by ERMA; Category 2:
                                                                                                                                                                                   Extraction        C          C         B          C              C




                                                                                                                                                                       Average
                                                                                    ACHIEVED                       Companies with sales turnover >USD 75 mn
                                                                                                    .




                                                                                                                   or >200 employees; 1 of 5 ASEAN finalists)                      & Production
 28%         28%         38%
                                     23%          23%         23%         26%         26%                   30%                                                                    Asia              B-         C         C          C              B
                                                                                                                   MEDC admitted to:
                                                                                                                   • IDX LQ45 Low Carbon                                           Global Average    B-         C         C          C              B
 72%         72%                     77%          77%         77%         74%                                        Leaders since Nov 2022
                         62%                                                          74%                   70%
                                                                                                                   • ESG Sector Leaders IDX                            1 First time
                                                                                                                                                                                            Leadership (A/A-)       : Implementing current best practices
                                                                                                                     KEHATI since Dec 2024                             reporter,            Management (B/B-)       : Taking coordinated action on climate issues
 2019 2020 2021 2022 2023 2024 2025                                                   2025                  2030   • ESG Quality 45 IDX                                score not            Awareness (C/C-)        : Knowledge of impacts on, and of, climate issues
                                                                                                                     KEHATI since Dec 2025                             published            Disclosure (D/D-)       : Transparent about climate issues
     Renewable IPP Capacity Gas IPP Capacity
     1 Based on the operational control, including assets acquired post 2019

14   2 Power renewable equity share installed capacity. Government of Indonesia target 2025: 23% and 2030: 25%                                                                                                                                        Value. Focus. Growth.
     3 The E&P Scope 1&2 GHG & Methane emission is assured by EY.

Page 15
     Portfolio Growth
15   Corridor PSC, South Sumatra   Value. Focus. Growth.

Page 16
            Oil & Gas Accretive Expansions
        3-Month TSR 36% in Q1
                                           South Natuna Sea                                                                                                              Corridor PSC                Sakakemang PSCs (45%) &
                                                                          Ophir Energy Plc                Corridor PSC              Oman 60 & 48 EPSA                                                                                       Cendramas PSC (50%)
                                             Block B PSC                                                                                                              (increased to 70%)              Transgasindo (TGI) (40%)
   Acquisition price                         USD 238 mn                       USD 541 mn                  USD 1,355 mn                    USD 713 mn3                     USD 425 mn                        USD 90 mn                                 n/a
   Debt repayment                                 18 months                   18 months                      24 months                       36 months                        36 months                        36 months                              n/a
   NCF since acquisition                         USD 704 mn1                 USD 568 mn1                 USD 1,811 mn1                    USD 248 mn1                        USD 137 mn1                       USD 20 mn1                             n/a
   Acquired 2P reserves                           35 mmboe                    69 mmboe                       124 mmboe                       53 mmboe                         58 mmboe                          26 mmboe                           15 mmboe4
   Acquired price/boe                              USD 6.4                      USD 7.9                      USD 10.9                        USD 13.5                          USD 7.3                             n/a                                n/a

   Credit rating                             B        B        B2        B+        B        B2          B+       B+       B1            B+      B+        B1          BB-       BB-       Ba3             BB-       BB-         Ba3          BB-      BB-       Ba3
                                                                                                                                                                                                                                                      BB-




                                       2016                                                      2019                                                          2022                                     2023                                 2025        2026
            140
                                                                                                                                                                                                                                                            2000
            120                                                                                                                                                                                                                                             1750
            100                                                                                                                                                                                                                                             1500




                                                                                                                                                                                                                                                                   MEDC Share Price
             80                                                                                                                                                                                                                                             1250
Oil Price




                                                                                                                                                                                                                                       USD 2.0 bn           1000
             60
                                                                                                                                                                                                USD 1.7 bn                                                  750
                                                                                                                                                                                                                                      2026 Q1 TSR2
             40
                                                                                        USD 0.8 bn                                                                                                                               3-Month        36%         500
             20                                                                                                                                       USD 1.1 bn                                                                12-Month        85%         250
              0              USD 0.2 bn                                                                                                                                                                                          5-Year        272%         0
              Jan-16                Jan-17                 Jan-18                Jan-19                 Jan-20                 Jan-21                Jan-22                   Jan-23               Jan-24                 Jan-25                Jan-26

                                Brent Price            MEDC Share Price                M&A Closing Date               Award Date                  Fitch                 S&P                Moody’s           USD bn Market Capitalization
             1 Net CF since acquisition up to 31 March 2026, calculated as revenue minus cost of sales minus capex.plus                 2 Bloomberg, Dividends reinvested                  4 Estimated additional 2P reserves
  16 depreciation and amortization minus current income tax                                                                             3 Including deferred consideration
                                                                                                                                                                                                                                              Value. Focus. Growth.

Page 17
  Proven Ability to Extract Value from Acquisitions
  93% of 2025 2P Reserves are Independently Certified
                Oil & Gas Production (mboepd)                                        Net 2P Reserves (mmboe)                                                           Reserves and Resources1 as of 31 Mar 2026:

          163       160
                             152     156
                                                     169    165-170
                                                                                                         564               551
                                                                                                                                         1P Reserves                                                         372 mmboe
                                             143                                      539
                                                                              481                  493            480
                                                             50%
                                                                                                                                         2P Reserves                                                         551 mmboe
                                                    122
          129      128      111      113
                                             104                                       355               440               431
                                                                                                                                         2C Resources                                                       1,154 mmboe
                                                                              336                  376            366
                                                             20%                                                                         1P RLI2                                                               7.8 Years

          34        32       41      43       39     47      30%              146      184
                                                                                                   117   124      115      120
                                                                                                                                         2P RLI2                                                              11.4 Years
         2022     2023      2024   2025     Q1 25   Q1 26    FY26             2022    2023     2024    2025 Q1 25         Q1 26          5-Year Average RRR2                                                       206%
                                                                                               Liquids     Gas
                Liquids
                Indexed Priced Gas
                                            Gas
                                            Fixed Priced Gas
                                                                                                                                         5-Year Average FD&A2                                                5.6 USD/boe
                                          Converting Acquired Resources to Reserves3                                                                                          Expanding Acquired Resources3
                                            Acquired 2P Reserves (MMBOE)                                                                                                  Acquired 2C Resources (MMBOE)
                                                                                                                                                     893                                                        224               901



                                                                                                                                                                           (214)                   (2)

                   365                                                                       214                    364


                                            (207)                     (8)

            At Acquisition           Cum. Prod. & Rev.           Divestment          Converted from 2C         At 31 Mar 2026                  At Acquisition        Converted to 2P           Divestment   Adds. & Rev.     At 31 Mar 2026

17 2 Reserves and Resources Net Working Interest at 31 March 2026
    1                                                                                         3 Acquisition of Block B Natuna 35 mmboe (2016), Ophir 69 mmboe (2019), Corridor 46% 124 mmboe (2022),
                                                                                                                                                                                                                           Value. Focus. Growth.
        As of 31 Dec 2025                                                                     Oman 53 mmboe (2023), Corridor 24% 58 mmboe (2025), and Sakakemang 26 mmboe (2025)

Page 18
 Q1 2026 Financial Results and 2026 Guidance
      Oil & Gas                                                          Oil & Gas            RG Net Debt
                         Power Sales               Capex                                                                       ROE
     Production                                                          Cash Cost             to EBITDA
                                                              Q1 2026 Results

                                                                                            1.7x
        169                1,053                     90                     9.0             USD 75 per boe
                                                                                                                                7
                                               O&G: 88   Power: 2                                                2.0x
       mboepd                  GWh                USD mn               USD per boe                             Mid-cycle at
                                                                                                             USD 65 per boe   Percent
                                                              2026 Guidance


     165 - 170             4,550 400-430 < 10  O&G: 415 Power: 15
                                                                                               < 2.5x                         > 15
       mboepd                  GWh                USD mn               USD per boe                   Mid-cycle at
                                                                                                    USD 65 per boe            Percent
     Bualuang Phase-1 onstream Q2 2026                                  Further portfolio enhancements

     Further Suban, Sambar, Bualuang and Sakakemang projects            AMMN smelter ramp up

     Continue Ijen, and Sumbawa PV and Batam IPP expansions             Continue dividend payment and debt repayment

18                                                                                                                              Value. Focus. Growth.

Page 19
     Appendix
19              Value. Focus. Growth.

Page 20
 Amman Mineral Statistics
     Metric                     Q 1- 2 6    Q4-25   Qo Q %    Q 1- 2 6   Q 1- 2 5   Yo Y %
                                                                                                    Copper Gross Reserves & Resources (Blbs)                             Gold Gross Reserves & Resources (Moz)
     Production
                                                                                                                   31/12/2024                                                          31/12/2024
        - Copper (Mlbs)           101         64    57.0        101          37     173.5
        - Gold (Koz)              136         27 401.6          136          32     320.9
        - Copper cathode (t)   27,670      38,797   (28.7)   27,670        635 4,257.5
        - Refined gold (oz)    66,209      79,930   (17.2)   66,209             -    n.a
     Net income (USD mn)            34        89    (62.5)        34      (29)      (215.4)
                                                                                                                                          25.1
                                                                                                                                                                                                                  35.1

                                                                                                                                                                               26.4
                                                                                                          17.8
                                                                                                                                          16.5
                                                                                                                                                                                                                  13.0
                                                                                                          5.6                                                                  6.3
                                                                                                       Reserves                    Reserves & Resources                      Reserves                     Reserves & Resources
                                                                                                                                                       Elang         Batu Hijau




                                                                                                              Copper Production (Mlbs)                                                Gold Production (Koz)
     Batu Hijau mine
                                                                                                                                                                                                                  803
                                                                                                                             464                                                                    731
                                                                                                                                         395

                                                                                                                 294               312
                                                                                              288                                                                                                           463
                                                                                                                       234                                     398
                                                                                                                                                 209
                                                                                                    142 130
                                                                                                                                                        101                                   156
                                                                                                                                                                                        132                                    136
                                                                                                                                                                        71                                               103
                                                                                                                                                                                56

                                                                                              2017 2018 2019 2020 2021 2022 2023 2024 2025 Q1 26               2017 2018 2019 2020 2021 2022 2023 2024 2025 Q1 26
     CCPP Complex

20                                                                                                                                                                                                             Value. Focus. Growth.

Page 21
  Financial Statistics
                                                                                                                      Q1 26 vs   Q1 26 vs
                                                     Metrics                  Q1 25   Q2 25   Q3 25   Q4 25   Q1 26
                                                                                                                      Q1 25 ∆%   Q4 25 ∆%
                                                   Average Realized Price
                                                    Oil                        72.2    66.5    66.3    62.6    75.1     3.9        19.8
                                                    Gas                        7.1     6.9     6.8     6.7     7.2      1.4         7.8
                                                   Revenue
                                                     Consolidated              560     578     619     638     668      19.2       4.7
                                                    RG                         511     526     567     598     620      21.3       3.6
                                                   Gross Profit
                                                    Consolidated               229     207     222     278     232       1.1      (16.6)
                                                    RG                         210     178     198     257     206      (2.1)     (19.9)
                                                   EBITDA
                                                    Consolidated               332     291     323     318     351      5.7       10.5
                                                    RG                         321     270     306     300     331      3.2       10.4
                                                   Net Income                  18      20      48      15      67      282.3      341.1

                                                   Cash & Cash Equivalent 1
                                                    Consolidated               876     883     755     633     598     (31.7)      (5.5)
                                                    RG                         707     709     595     475     474     (32.9)      (0.2)
                                                   Total Debt
                                                     Consolidated             3,430   3,458   3,661   3,646   3,520      2.6       (3.5)
                                                    RG                        2,829   2,840   2,953   2,879   2,780     (1.7)      (3.4)
                                                   Net Debt to EBITDA
                                                     Consolidated              1.9     2.2     2.2     2.4     2.1      8.3       (12.2)
                                                     RG                        1.7     2.0     1.9     2.0     1.7      5.4       (13.9)

21 1 Cash & Cash Equivalent includes restricted cash in banks                                                                               Value. Focus. Growth.

Page 22
 Anchored in Indonesia, We Operate in Southeast Asia and The Middle East
 Diverse energy mix of Oil & Gas, Clean Power, and Copper & Gold Mining Assets
                                                                                                                                                             Mexico                                Yemen
                                            Thailand




                Bualuang,                                                                           Simenggaris
                Thailand                                            South Natuna                                                                 Tarakan
                                                                    Sea Block B                                                                  West Bangkanai
                               Block A             Cendramas                Onshore Receiving
                                                                                                                                                 Bangkanai
                                                                            Facility, Singapore
                                                        Beluga                                                                                   Donggi-Senoro LNG
     Sarulla Geothermal                                                         North
       Samosir Geothermal                                                       Sokang
                                                                                                                                                                                        Tanzania      Oman
            Riau Gas-fired
           Bonjol Geothermal                                   DEB, MEB &
                                                               ELB Gas-fired           Kalimantan
                        Corridor                                                                              Sulawesi
            South Sumatra Region
                        Sakakemang                                     EPE & MPE Gas-fired                                                                                      Papua
                                                                         The Energy Building
                    South Sakakemang                                                                   Sampang                   Senoro-Toili
                                 Amanah                                        Java                        Madura

                 Cibalapulang Mini-hydro
                        Pusaka Mini-hydro
                                                           Ijen Geothermal            East and West      Sumbawa           Batu Hijau           Elang
                                                                                      Bali Solar PVs     Solar PV

                                                   Production            Gas Pipeline                                               Installed                                  Production
                                                   Development               West Natuna Transportation System                      Development                                Development
                                                   Exploration               Grissik-Batam-Singapore                                Exploration                                Exploration
                                                                             Grissik-Duri
                                     Oil & Gas                                                                           Power                          Copper & Gold Mining



22                                                                                                                                                                                                           Value. Focus. Growth.

Page 23
PT Medco Energi Internasional Tbk
The Energy Building 53rd Floor
SCBD Lot 11A
Jl. Jend. Sudirman, Jakarta 12190
Indonesia
P. +62-21 2995 3000
F. +62-21 2995 3001
E. investor.relations@medcoenergi.com
  investor.relations@medcoenergi.com




Website : www.medcoenergi.com


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