Build Confidence in Your ESG Data

The global sustainability reporting landscape is evolving rapidly. While many organisations have focused on establishing their ESG reporting processes over recent years, regulators are increasingly turning their attention to the quality, reliability and assurance of sustainability information.

In Hong Kong, the Hong Kong Stock Exchange encourages issuers to obtain external assurance over sustainability disclosures. Meanwhile, the Accounting and Financial Reporting Council (AFRC) has consulted on introducing mandatory limited assurance requirements as Hong Kong progressively adopts the HKFRS Sustainability Disclosure Standards for the financial year commencing 1  January 2028.

Similarly, Singapore Stock Exchange has also announced a phased roadmap towards mandatory external limited assurance over Scope 1 and Scope 2 greenhouse gas emissions for listed issuers in the financial year commencing 1 January 2029.

Although assurance requirements will be introduced progressively, organisations are encouraged to strengthen their ESG data governance, internal controls and reporting processes well in advance. Early preparation not only improves reporting quality but also reduces the time, cost and effort required when assurance becomes mandatory.

Assurance Readiness Starts Long Before the Assurance Engagement

Successful assurance is built on reliable data, robust documentation and effective internal controls.

Many organisations discover during the assurance process that they face challenges such as

  • inconsistent calculation methodologies;
  •  incomplete supporting evidence;
  • fragmented data collection procedures; or
  • insufficient audit trails.

Resolving these issues at the assurance stage can be both time-consuming and costly.

GreenCo helps organisations prepare for assurance before these challenges arise. By reviewing reporting processes, greenhouse gas calculations and supporting documentation in advance, we help clients strengthen the quality and credibility of their sustainability reporting.

Our ESG Reporting Assurance Services

GreenCo provides comprehensive support throughout the sustainability assurance journey, from assurance readiness assessments to independent assurance engagements.

Our services include:

  • ESG assurance readiness assessments

  • Internal review of sustainability reports and climate disclosures

  • Scope 1 and Scope 2 greenhouse gas emissions review

  • ESG data quality and consistency review

  • Review of supporting evidence and documentation

  • Assessment of ESG data governance and internal controls

  • Identification of reporting gaps and practical improvement recommendations

  • Limited assurance engagements, where appropriate

  • Ongoing support to strengthen future reporting processes

Whether your organisation is preparing for future regulatory requirements or seeking greater confidence in the quality of its ESG disclosures, our team provides practical, risk-focused and commercially sensible advice.

Common Assurance Challenges

Based on our experience supporting more than 80 listed companies across Hong Kong, Singapore and APAC region, we frequently observe similar challenges during ESG reporting:

  • Inconsistent data collection methodologies across business units
  • Missing or incomplete supporting documentation
  • Weak internal review and approval procedures
  • Changes in calculation methodologies between reporting years
  • Insufficient evidence supporting reported KPIs
  • Scope 1 and Scope 2 emissions calculations that lack clear documentation
  • Limited traceability from reported figures back to source data

Identifying these issues before an assurance engagement helps organisations improve reporting quality, minimise assurance findings and build greater confidence in their sustainability disclosures.

Our Four-Step Assurance Methodology

Step 1 – Assurance Readiness Assessment

We review your current ESG reporting processes, governance arrangements, internal controls and supporting documentation to evaluate your organisation’s readiness for assurance.

Step 2 – Data and Documentation Review

Our consultants examine ESG performance data, greenhouse gas calculations and supporting evidence to identify inconsistencies, documentation gaps and potential reporting risks.

Step 3 – Gap Analysis and Improvement Plan

We assess your reporting processes against recognised assurance expectations and provide practical recommendations to strengthen data quality, documentation and governance.

Step 4 – Assurance Engagement or Preparation

Depending on your organisation’s needs, our team can either assist with preparations for an assurance engagement or perform an independent limited assurance engagement through our dedicated assurance team, where appropriate and in accordance with applicable professional and ethical requirements.

Professional Assurance Expertise

GreenCo combines experienced ESG consultants with Certified Public Accountants and accounting professionals, providing clients with both technical sustainability knowledge and professional assurance expertise.

Unlike many ESG consultancies that focus solely on reporting, our multidisciplinary team understands the practical expectations of assurance engagements, including data governance, internal controls, documentation standards and evidence management.

Our assurance engagements are performed in accordance with applicable professional assurance standards, including the International Standard on Sustainability Assurance (ISSA) 5000, together with other applicable professional standards where appropriate.

Where both advisory and assurance services are provided, GreenCo operates separate engagement teams and applies appropriate professional safeguards to maintain independence and objectivity in accordance with applicable ethical and assurance requirements.

Why Choose GreenCo?

Preparing for assurance is about far more than obtaining an assurance opinion, it requires organisations to establish reliable reporting systems that can consistently produce accurate, transparent and verifiable sustainability information.

Having supported more than 80 listed companies across Hong Kong, Singapore and APAC region, GreenCo understands the common reporting challenges organisations face and the practical solutions needed to overcome them.

Whether you are seeking an independent review of your ESG reporting, preparing for future mandatory assurance requirements or looking for professional limited assurance services, our experienced ESG consultants and Certified Public Accountants are ready to support your organisation with practical, proportionate and high-quality advice.

Contact GreenCo today to discuss how we can help your organisation strengthen its ESG reporting and prepare confidently for the future of sustainability assurance.

Need Any Help? Contact Us

ISO 9001 Certified in ESG Advisory

Hong Kong | Singapore | Chinese Mainland

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