Some companies scramble to fill in what they can and hope the buyer doesn't look too closely. Others push back and get quietly deprioritized. A few lose the contract entirely and only find out why later, buried in a procurement review they weren't part of.
This is the reality that a growing number of mid-size suppliers are waking up to in 2026, and most of them weren't given much warning that it was coming.
Large companies have spent the past few years making increasingly ambitious environmental commitments. Net-zero targets, science-based emissions reduction goals, Scope 3 disclosure pledges. What many of them underestimated is that meeting those commitments requires data they don't control — data that sits inside their suppliers' operations.
Supply chain emissions are, on average, 26x greater than what a company generates from its own facilities, according to CDP's supply chain research. That number makes supplier engagement unavoidable for any buyer that has made a serious emissions commitment. You cannot hit a Scope 3 target without knowing what your suppliers are emitting, and you cannot know that without asking them directly.
So buyers are asking. In 2025, more than 270 major buyers requested environmental disclosure from roughly 45,000 suppliers through CDP's Supply Chain program alone. That's one disclosure channel. Similar pressure is flowing through EcoVadis assessments, Sedex audits, customer-specific ESG questionnaires, and contract renewal language that now routinely includes environmental performance thresholds.
For mid-size suppliers sitting inside those networks, this isn't an industry trend to watch. It's an operational problem that is already showing up in their customer relationships.
Large buyers generally have dedicated sustainability teams, reporting platforms, and years of emissions tracking behind them. Their mid-size suppliers often have none of that. The data being requested — Scope 1 and Scope 2 emissions, energy consumption by facility, waste metrics, water usage — requires measurement systems, consistent methodology, and some form of governance to produce reliably.
A 2025 survey by IntegrityNext found that 70% of global companies have already embedded sustainability into their procurement process. That percentage reflects the buyers. It says nothing about the suppliers receiving those requests, many of whom are encountering formal environmental data requirements for the first time.
According to the 2025 MIT Sustainable Supply Chain Lab report, 85% of companies are now maintaining or increasing their sustainability efforts in supply chains. While tracking Scope 3 emissions remains a challenge, 80% of firms now consider sustainability vital to their long-term success.
The scorecards exist. The suppliers being scored aren't always in a position to respond to them meaningfully.
That mismatch is where the real problem lives. A buyer marks a supplier as non-compliant or low-scoring not because the supplier's environmental performance is poor, but because the supplier can't document what it's actually doing. The outcome — deprioritization, reduced contract value, or outright delisting — is the same either way.
Buyer pressure alone would be enough to warrant attention. What makes 2026 different is that regulatory requirements are now compounding it.
California's Climate Corporate Data Accountability Act requires companies with over $1 billion in revenue doing business in the state to report Scope 1 and 2 emissions starting this year, with Scope 3 disclosures due by 2027. The EU's Corporate Sustainability Reporting Directive is in its second phase, requiring a broader set of companies to report value chain emissions, which in practice means getting that data from their suppliers. The EU's Carbon Border Adjustment Mechanism (CBAM) entered full enforcement in January 2026, converting what had been a reporting exercise into a financial one for companies importing materials like steel, aluminum, and cement.
Each of these frameworks creates downstream data requirements. Buyers subject to them need supplier-level environmental data to comply. Suppliers that can't provide it become a liability rather than an asset in those relationships.
The contract renewal process is where many mid-size suppliers first feel the full weight of this shift. Environmental performance thresholds are increasingly written directly into supplier codes of conduct and contract terms. A supplier that has operated for years on price, quality, and delivery metrics is now being evaluated against environmental criteria it may not have known existed.
The timing can be brutal. A supplier learns at renewal that its EcoVadis score is below the buyer's threshold, or that it failed to respond to a CDP supply chain request and was marked as non-disclosing. By that point, there is usually no runway to fix the underlying data problem before the decision is made.
Companies that invest early in building environmental data systems, even at a basic level, are accumulating a meaningful advantage over those that wait for the next buyer request to force the issue. The suppliers building that infrastructure now are the ones with room to improve their position. Those waiting until a contract is already at risk are operating with far less time and far fewer options.
The good news for mid-size suppliers is that the baseline being asked for right now is not particularly sophisticated. Most buyers, at this stage, want Scope 1 and Scope 2 data: direct emissions from owned facilities and purchased energy. Getting a defensible number in those two categories, verified by a third party, puts a supplier ahead of a significant portion of its peers.
From there, the priority is making sure that data is flowing through the channels buyers actually use to collect it. CDP disclosure, EcoVadis assessments, and buyer-specific questionnaires each pull from different inputs. A supplier that has strong internal data but hasn't connected it to those platforms is still scoring poorly in the places that matter.
The environmental accountability that large companies are committing to publicly has to come from somewhere. For mid-size suppliers, 2026 is the year that somewhere starts to feel very close to home.
