Why Your Supplier's ESG Score Now Affects Yours?

ESG reporting under BRSR was once primarily about what happens inside a company's own operations. That scope is widening. What a company's suppliers do, how they manage emissions, water, waste, and labour, is increasingly becoming part of that company's own ESG story, whether or not it appears as a mandatory disclosure line.

This matters because of how BRSR is structured. The top 1,000 listed companies by market capitalisation must report under BRSR, and the top 150 are subject to BRSR Core assurance requirements. Value chain disclosure was designed to extend this logic outward to significant suppliers, but SEBI's March 2025 circular made this layer voluntary rather than mandatory.

This article explains what BRSR value chain disclosure actually requires, why supplier ESG performance affects a reporting company even without a mandatory obligation, and what businesses should do to prepare.

BRSR Core is a defined subset of indicators within the broader BRSR framework, covering nine ESG attributes including GHG emissions, water and waste management, and employee wellbeing. SEBI originally proposed extending select Core indicators to a company's value chain, with this becoming mandatory for the top 150 listed entities by market capitalisation starting FY 2024-25.

SEBI's March 2025 circular changed this. Value chain disclosure and its assurance moved from mandatory to voluntary, on a comply or explain basis, in response to industry concerns about data availability, supplier readiness, and assurance cost. The correct regulatory term here is assessment or assurance, not reasonable assurance, which applies only to the reporting company's own BRSR Core indicators and not to the value chain layer.

SEBI defines value chain in this context using a specific threshold: significant value chain partners are upstream and downstream entities that individually account for 2% or more of the listed entity's purchases or sales by value. This is a defined cutoff, not an open-ended instruction to assess every vendor relationship.

BRSR value chain disclosure may be voluntary under current SEBI rules, but the influence of supplier ESG performance on a company's own climate numbers, investor relationships, and reputational standing is not optional in practice. The regulatory line and the business reality have diverged, and companies that only track the former are missing the latter.

As SEBI continues to phase in BRSR Core requirements and investor expectations around supply chain transparency deepen, companies that have already built supplier data infrastructure will be the ones positioned to respond quickly, whatever the next regulatory step turns out to be.