The European Commission has adopted revised European Sustainability Reporting Standards (ESRS), cutting disclosure requirements and narrowing the scope of the Corporate Sustainability Reporting Directive (CSRD) in a move that will materially reshape the ESG data available to investors.

The changes form part of the EU’s ‘Omnibus I’ simplification agenda, which aims to reduce reporting burdens and recalibrate the scope of sustainability disclosure across the bloc in line with global standards. For investors, this represents a structural reset. Coverage declines, disclosures become simpler, and interpretation becomes more important.

How the Revised ESRS Reduces Sustainability Reporting Requirements

The most immediate impact is a sharp reduction in scope. By raising the CSRD threshold to companies with more than €450 million in revenue and 1,000 employees, around 90% of previously in-scope companies fall out of mandatory reporting. This materially reduces the availability of standardised ESG data, particularly across mid-cap and smaller issuers.

A voluntary regime based on the Voluntary Sustainability Reporting Standard for non-listed small and medium-sized enterprises (VSME) framework remains in place, but uptake and consistency are uncertain. As a result, reporting is likely to become more uneven, with large companies continuing to disclose under a structured framework while smaller firms provide more selective and less comparable information.

For those still in scope, the reporting burden is significantly reduced. Mandatory datapoints fall by 61%, and the removal of voluntary disclosures brings the total reduction to over 70%. This simplifies reporting and may improve comparability by reducing noise, but it also removes depth. Investors lose access to metrics that supported more granular and forward-looking analysis, increasing reliance on proprietary data and direct engagement.

What the New ESRS Means for ESG Investors and Data Comparability

The revised ESRS also moves closer to IFRS Sustainability Disclosure Standards, including allowing either financial or operational control approaches for defining emissions boundaries. This improves interoperability for multinational issuers and signals a clearer direction towards global alignment.

However, flexibility introduces variation in how emissions are defined, which may limit comparability and require closer scrutiny of methodologies. Targeted clarifications reinforce a broader push for proportionality. Notably, asset managers are no longer required to disclose sustainability information for assets they manage on behalf of clients, reducing duplication and aligning reporting responsibility more closely with economic ownership. While this lowers the compliance burden, it also concentrates expectations at the asset owner level.

Despite the wider simplification, the requirement to disclose misalignment with a 1.5°C pathway has been retained, preserving visibility on one of the most decision-relevant aspects of corporate strategy.

The combined effect is clear. Fewer companies will report, disclosures will be narrower in scope, and methodological flexibility will increase. The framework is simpler, but the informational burden shifts. Investors will have less standardised data, particularly outside large-cap issuers, and fewer datapoints within it, while the need for interpretation and supplementary analysis grows.

The revised ESRS reduces complexity for companies but raises the analytical bar for the market. Its success will depend less on the volume of disclosure and more on whether the remaining information proves sufficiently consistent and decision-useful. The advantage will sit with those able to replace lost breadth with proprietary insight and active engagement.