What GRI reporting actually involves

The Global Reporting Initiative (GRI) Standards are the world's most widely used framework for sustainability reporting, covering how organisations disclose their impacts on the economy, environment, and people. The current GRI Standards (2021 series) include universal standards applicable to all organisations, sector standards for specific industries, and topic standards covering specific sustainability issues. GRI reporting follows an impact materiality perspective, companies report on topics where they have significant impacts, regardless of whether those impacts are financially material to the company. GRI-aligned reports are used by investors, NGOs, regulators, customers, and employees.

Why it's harder in practice than it looks

The 2021 Standards update introduced significant new requirements

GRI's 2021 Standards revision introduced mandatory due diligence disclosures (GRI 2-23 to 2-26), extended reporting on value chain impacts, and new topic standards. Companies using older GRI Standards without updating their disclosures to the 2021 series are now misaligned with current requirements, which affects credibility with sophisticated readers.

Materiality process documentation is now mandatory, not optional

GRI 3 (Material Topics) requires organisations to document the process used to determine material topics, including stakeholder engagement inputs and the criteria applied. Companies that have been using GRI without a formally documented materiality process are now non-compliant with the universal standards, not just with specific topic disclosures.

Value chain disclosures require data beyond the organisational boundary

GRI 2021 Standards require organisations to consider their impacts across the value chain, not just within their own operations. Reporting on value chain impacts requires supplier engagement, supply chain data, and due diligence processes that go substantially beyond what most companies currently collect for their own operations.

GRI and CSRD alignment requires active management

EFRAG designed the ESRS to reference GRI Standards where they align, but the mapping is not a one-to-one substitution. Companies using both must understand where ESRS and GRI requirements overlap, where they diverge, and where additional disclosures are required to satisfy each standard independently. This requires a systematic disclosure architecture rather than ad hoc cross-referencing.

What good looks like

A high-quality GRI report follows the GRI 2021 Universal Standards in full, has a documented impact materiality assessment that identifies the specific GRI Topic Standards applicable to the organisation, discloses all required information for each material topic or explains why specific disclosures are omitted, uses verified data supported by an assurance statement, and includes a GRI content index that allows readers to verify compliance. The report is consistent with other corporate communications and reviewed by an external assurance provider.

When to bring in external support

GRI Standards interpretation, materiality process design, disclosure architecture, and assurance preparation all benefit from specialist expertise. Leafr's network includes GRI reporting specialists who have supported companies across multiple sectors in producing compliant, investor-grade reports aligned with both GRI 2021 and CSRD requirements.

Frequently asked questions

What are the GRI Standards and who uses them?

The GRI Standards are a modular set of sustainability reporting requirements developed by the Global Reporting Initiative, an independent international organisation. They are used by over 10,000 organisations in more than 100 countries, from large multinationals to public sector organisations, to report on their environmental, social, and governance impacts. GRI is the most widely adopted sustainability reporting framework globally and is explicitly referenced in EU, UK, and international regulatory guidance.

What is the difference between GRI-aligned and GRI-referenced reporting?

GRI-aligned reporting means the organisation has applied the GRI Standards in full, following all the requirements of GRI 1, 2, and 3 and the applicable topic standards, and producing a GRI content index. GRI-referenced reporting means the organisation has used some GRI disclosures as a reference without following all the requirements for full alignment. Only GRI-aligned reporting satisfies the compliance expectations of investors and regulators who specify GRI as a required framework.

Does GRI reporting satisfy CSRD requirements?

GRI reporting alone does not satisfy CSRD requirements. CSRD requires reporting against the ESRS, which have their own specific disclosure requirements. However, EFRAG designed the ESRS with reference to GRI, and GRI has published a mapping showing how GRI disclosures correspond to ESRS requirements. Companies that have been reporting under GRI have a useful head start, but will need to supplement their disclosures to meet ESRS-specific requirements, particularly around double materiality assessment, iXBRL tagging, and third-party assurance.

What is a GRI content index?

The GRI content index is a structured table that maps every GRI disclosure the organisation has reported against the corresponding GRI Standard, provides a page or section reference, and explains any omissions with a reason. It is a mandatory component of GRI-aligned reporting and is the primary tool by which readers and assurance providers verify that all required disclosures have been made. A well-constructed GRI content index is also the foundation for mapping disclosures to other frameworks such as ESRS or SASB.

How often should GRI reports be published?

GRI Standards do not mandate a specific reporting frequency, but annual reporting aligned with the financial reporting cycle is standard practice for large organisations. Some organisations publish interim or quarterly updates on specific metrics alongside their annual GRI report. The frequency should be sufficient to provide stakeholders with timely information about the organisation's performance and to meet any regulatory or investor reporting obligations that reference GRI disclosures.