Annex Page 1 of 3 Statement number: DNV-2024-ASR-679330 to the Management of Abu Dhabi National Oil Company Scope and Approach DNV AS Abu Dhabi Branch (DNV, us or we) were engaged by Abu Dhabi National Oil Company (ADNOC) to conduct a limited assurance engagement over selected sustainability metrics of ADNOC subsidiary companies, presented in Abu Dhabi National Oil Company 2023 Sustainability Report and data index (the Report), covering the reporting year from January 2023 to December 2023. The version of the 2023 Abu Dhabi National Oil Company Sustainability Report and Data Index that was verified by DNV was the version of 28-Mar-2024. The scope and boundary of our work is restricted to the key performance indicators of ADNOC subsidiary companies / units mentioned below in Table 1 (the Selected Information). Other business was not part of our scope. Table 1: Sustainability Metrics KPI Verified Value Unit Standard Scope 1 + Scope 2 emissions 1 24.0 2 Million tCO 2 e ADNOC KPI Methane emissions 28.5 3 ktonsCH 4 ADNOC KPI Total flaring volume 25,976 4 MMSCF ADNOC KPI Total quantity of hydrocarbon gas flared from Operations Clean Power Import 10,694,567.00 5 MWh ADNOC KPI I-REC Clean Energy Certificates TRIR 6 0.12 7 Number ADNOC KPI rate of recordable work-related- injuries LTIF 6 0.04 7 Number ADNOC KPI Loss Time Injury Frequency FAR 6 0 7 Number ADNOC KPI rate of fatalities as a result of work-related injury Our observations and areas for improvement will be raised in a separate report to ADNOC Management. Selected observations are provided below. These observations do not affect our conclusion set out below. The company has established a variety of process for collecting and consolidating the various data it reports. We have confidence in the process in place to ensure reasonable accuracy for the information presented in the report and management systems. Standard and level of assurance We performed a limited assurance engagement in accordance with the VeriSustain 6.0, DNV own protocol that is aligned with International Standard on Assurance Engagements (ISAE) 3000 Assurance Engagements other than Audits and Reviews of Historical Financ ial Information (revised), issued by the International Auditing and Assurance Standards Board. This standard requires that we comply with ethical requirements and plan and perform the assurance engagement to obtain limited assurance. 1 Verified values of scope 1 emissions are inclusive of Methane emissions and emissions associated with flaring. 2 This is sum of values for ADNOC units Al Yasat Petroleum, Al Dhafra Petroleum, ADNOC Drilling, ADNOC Gas, ADNOC Offshore, ADNOC Onshore and ADNOC Sour Gas. 3 This is sum of Methane emission from Upstream operating units of ADNOC. 4 This is sum of values for ADNOC units Al Dhafra Petroleum, ADNOC Gas, ADNOC Offshore, ADNOC Onshore, ADNOC Refining and ADNOC Sour Gas, ADNOC Gas (LNG) and Borouge. 5 These are summation of values for ADNOC units Al Dhafra Petroleum, ADNOC Drilling, ADNOC Gas, ADNOC Onshore, and ADNOC Sour Gas. 6 TRIR = Total recordable injury rate; LTIF = Lost time frequency rate; FAR = Fatality accident rate. 7 These values are for ADNOC Group. 120