Independent practitioner’s limited assurance report

on selected aspects in the Sustainability Section in the annual report 2025 to the Board of Directors of SIG Group AG, Neuhausen am Rheinfall

We have been engaged by the Board of Directors to perform assurance procedures to provide limited assurance on the preparation of selected Key Performance Indicators 2025 (Annex A) as well as on the preparation of the non-financial disclosures as required by Art. 964b Swiss Code of Obligations (CO) applying Art. 964b para. 3 CO (as included in Appendix “Swiss non-financial matter report” on pages 134 to 135), and article 3 of the Ordinance for climate-related disclosures (the Appendix “TCFD report” on pages 136 to 143) (together referred to as the “Subject Matter”) as disclosed in the Sustainability Section (pages 36 to 176) of SIG Group AG annual report for the period ended December 31, 2025. All Subject Matters are identifiable by the symbol.icon check blue

The Sustainability Section (including the GHG emissions) was prepared by the Board of Directors of SIG Group AG (the “Company”) based on the following criteria as explained in the “Appendix─Reporting regulations and frameworks” which explains the application of Swiss Code Obligation Regulation, among others, in the Sustainability Section (the “Reporting Criteria”):

• Global Reporting Initiative (GRI) Version 2021

• the Greenhouse Gas Protocol Initiative Corporate Standards (Revised Edition)

• requirements of Article 964b CO applying Article 964b, para. 3 CO

• requirements of Article 3 of the Ordinance for climate-related disclosures

• description in the related footnotes for the internally developed KPIs identified as “own disclosure” in the GRI content index on pages 147 to 161

Inherent limitations

The accuracy and completeness of the Sustainability Section (including the GHG emissions) are subject to inherent limitations given their nature and methods for determining, calculating and estimating such data. In addition, the quantification of the Sustainability Section (including the GHG emissions) is subject to inherent uncertainty because of incomplete scientific knowledge used to determine factors and the values needed to combine e.g. emissions of different gases.

Carbon offsets are subject to inherent limitations, including but not limited to the extent of social impact, the risk of double counting, lack of additionality, leakage, permanence, and uncertainties as to whether the expected reductions or removals will occur. This could impact the estimated reduction or removal of CO₂e assigned to those offsets.

Some of the climate-related disclosures will include prospective information prepared for setting and preparing the implementation of such metrics, targets, and transition plans, using a set of assumptions that include hypothetical assumptions about future events and management’s actions that are not necessarily expected to occur. Consequently, readers are cautioned that the prospective information is not used for purposes other than that described. Therefore, the climate metrics, projections, forecasts and other forward-looking statements used in your climate-related disclosures should be treated with special caution, in particular as they are more uncertain than, for example, historical financial information, and given the wider uncertainty around the evolution and impact of climate change.

Our assurance report will therefore have to be read in connection with the Reporting Criteria applied by SIG Group AG, its definitions and procedures as described in the “Appendix-Reporting regulations and frameworks” subsection.

Board of Directors’ responsibility

The Board of Directors of the SIG Group AG is responsible for preparing and presenting the Sustainability Section (including the GHG emissions) in accordance with the Reporting Criteria stated in the in the “Appendix-Reporting regulations and frameworks” in the Sustainability Section. This responsibility includes designing, implementing and maintaining an internal control system relevant to the preparation and presentation of the Sustainability Section, selecting and applying appropriate policies and making estimates that are reasonable in the circumstances as well as the prevention and detection of fraud, other irregularities and errors and non-compliance with law or regulations and the related record keeping.

Independence and quality management

We have complied with the independence and other ethical requirements of the International Code of Ethics for Professional Accountants (including International Independence Standards) issued by the International Ethics Standards Board for Accountants (IESBA Code), which is founded on fundamental principles of integrity, objectivity, professional competence and due care, confidentiality and professional behaviour and relevant independence and ethical requirements as transposed in Switzerland by EXPERTsuisse.

PricewaterhouseCoopers AG applies International Standard on Quality Management 1, which requires the firm to design, implement and operate a system of quality management including policies or procedures regarding compliance with ethical requirements, professional standards and applicable legal and regulatory requirements.

Practitioner’s responsibility

Our responsibility is to perform an assurance limited engagement and to express a conclusion on the Subject Matter. We conducted our engagement in accordance with the International Standard on Assurance Engagements (ISAE) 3000 (Revised) ‘Assurance engagements other than audits or reviews of historical financial information’ and the International Standard on Assurance Engagements 3410, Assurance Engagements on Greenhouse Gas Statements ('ISAE 3410’), issued by the International Auditing and Assurance Standards Board. Those standards require that we plan and perform our procedures to obtain limited assurance whether anything has come to our attention that causes us to believe that the Subject Matter was not prepared and presented, in all material aspects, in accordance with the Reporting Criteria for the period ended December 31, 2025.

Based on risk and materiality considerations, we performed our procedures to obtain sufficient and appropriate assurance evidence. The procedures selected depend on the assurance practitioner’s judgement. A limited assurance engagement under ISAE 3000 (Revised) and ISAE 3410 is substantially less in scope than a reasonable assurance engagement in relation to both the risk assessment procedures, including an understanding of internal control, and the procedures performed in response to the assessed risks. Consequently, the nature, timing and extent of procedures for gathering sufficient appropriate evidence are deliberately limited relative to a reasonable assurance engagement and therefore less assurance is obtained with a limited assurance engagement than for a reasonable assurance engagement.

We performed the following procedures:

• Obtaining an understanding of the structure of the sustainability organization and of the stakeholder engagement;

• Inquiries of personnel and executive directors involved in the preparation of the Sustainability Section regarding the preparation process;

• Evaluating the appropriateness and consistency of the Reporting Criteria used and selected Key Performance Indicators 2025 (Annex A) in the Sustainability Section subject to our limited assurance engagement. This includes the evaluation and the reasonableness of estimates made by management;

• Identification of the likely risks of material misstatement of the Sustainability Section under consideration of the GRI-Criteria;

• Analytical evaluation of Subject Matter in the Sustainability Section;

• Evaluation of the presentation of the Subject Matter regarding sustainability performance;

• Performance of site visits as part of the inspection of processes and guidelines for data collection at the following locations: Linnich, Neuhausen, Rayong, Suzhou, Riyadh, Chilhowie, Merced, Curitiba, Eisfeld.

• Assessment of CO₂ compensation certificates exclusively with regard to their existence, but not with regard to their effect Assurance Conclusion;

• Evaluated whether the Sustainability Section contains the minimum required information as per article 964b CO, applying article 964b para.3 CO;

• Assessment of the process in place and activities undertaken in the preparation of the non-financial disclosures as included in Appendix “Swiss non-financial matter report” on pages 134 to 135 and for the Appendix “TCFD report” on pages 136 to 143;

• Evaluating the disclosures in, and overall presentation of, the Subject Matter information through critical reading of the Sustainability Section in the Annual Report.

The scope of our work did not extend to information in respect of earlier periods or to any other information included in, or linked from, the Sustainability Section 2025.

We believe that the evidence we have obtained is sufficient and appropriate to provide a basis for our conclusion.

Conclusion

Based on the work we performed, nothing has come to our attention that causes us to believe that the preparation of the Subject Matter identifiable by the symbol icon check blue is not, in all material aspect, in accordance with the Reporting Criteria as explained in the section “Appendix─Reporting regulations and frameworks” of the Sustainability Section of SIG Group AG annual report for the period ended December 31, 2025.

Reporting on Other Information

The other information comprises all information in the Sustainability Section other than the Subject Matter Information in the annual report 2025 and our assurance report. The Board of Directors are responsible for the other information. As explained above, our assurance conclusions do not extend to the other information and, accordingly, we do not express any form of assurance thereon.

Intended users and purpose of the report

This report is prepared for, and only for, the Board of Directors of SIG Group AG, and solely for the purpose of reporting to them on aspects in the Sustainability Section (including the GHG emissions) and no other purpose. We do not, in giving our conclusion, accept or assume responsibility (legal or otherwise) or accept liability for, or in connection with, any other purpose for which our report including the conclusion may be used, or to any other person to whom our report is shown or into whose hands it may come, and no other persons shall be entitled to rely on our conclusion.

We permit the disclosure of our report, in full only and in combination with the Reporting Criteria, to enable the Board of Directors to demonstrate that they have discharged their governance responsibilities by commissioning an independent assurance report over the Sustainability Section on the Subject Matter, without assuming or accepting any responsibility or liability to any third parties on our part. To the fullest extent permitted by law, we do not accept or assume responsibility to anyone other than the Board of Directors of SIG Group AG for our work or this report.

PricewaterhouseCoopers AG

Basel, 27 February 2026

Enclosure: Annex A – Selected Key Performance Indicators in scope

The maintenance and integrity of SIG Group AG’s website and its content are the responsibility of the Board of Directors. The work we have performed as the independent assurance practitioner does not involve consideration of the maintenance and integrity of the SIG Group AG’s website. Accordingly, we accept no responsibility for any changes that may have occurred to the reported Sustainability Section (including the GHG emissions) or Reporting Criteria since they were initially presented on the website.

Annex A – Selected Key Performance Indicators in scope

PricewaterhouseCoopers AG, St. Jakobs-Strasse 25, 4002 Basel, Telefon: +41 58 792 51 00, www.pwc.ch

PricewaterhouseCoopers AG is a member of the global PricewaterhouseCoopers network of firms, each of which is a separate and independent legal entity.