How to Handle Non-Market Adjustments in Resin Contracts

If you've been buying resin for any length of time, you've probably seen a price adjustment hit your contract that didn't line up with anything happening in the market. Feedstocks were flat, demand was steady, and operating rates hadn't changed. And yet your index moved a few cents in the wrong direction.

That's usually a non-market adjustment. NMAs are corrections that index publishers apply when they decide their published price has drifted from where the market actually sits. They're baked into the methodology of indexes like CDI and ICIS, and they can add real cost to your resin spend without any market event behind them.

Understanding what NMAs are is the first step. Having a strategy to catch them on your invoice and push back effectively is what actually protects your margins.

Key Takeaways

• Non-market adjustments are index corrections that move your contract pricing independently of supply, demand, or feedstock fundamentals.
• NMAs tend to skew in one direction. Upward adjustments happen more often and run larger than downward ones, creating a persistent cost tailwind that favors suppliers over time.
• Tracking the difference between your actual paid price and published index movements shows whether NMAs are quietly adding to your costs.
• Buyers who raise NMAs with specific data get treated differently than buyers who absorb them without comment.

What Non-Market Adjustments Are and Why They Happen

Index publishers maintain their pricing benchmarks by surveying market participants, collecting transaction data, and applying their methodology to produce a published number. Most of the time, that number moves in response to actual supply and demand signals.

But sometimes the publisher determines that their published price has drifted from where the market is actually trading. Maybe surveyed prices shifted gradually without the index catching up, or maybe the methodology missed a change in transaction patterns. Whatever the reason, the publisher applies a correction.

That correction is the non-market adjustment. It isn't driven by ethylene costs, plant outages, or export flows — it's a methodological recalibration, and it flows directly through to every contract priced against that index. We cover the underlying mechanics in detail in our NMA explainer.

The concern isn't that publishers correct their data. Rather, the concern is that these corrections follow a pattern that consistently adds cost on the buyer's side. Upward NMAs tend to be more frequent, larger, and applied faster than downward ones. Over time, that asymmetry builds into real money with no market event to justify it.

How to Spot a Non-Market Adjustment on Your Resin Invoice

NMAs don't come with a label. They show up as part of the normal index movement, and unless you're watching the pieces behind that movement, they're easy to miss.

The most direct way to catch one is comparing the index change against what the market actually did. If your contract settles at CDI plus your negotiated delta, and CDI moved up 3 cents this month, ask what drove it. Was there a feedstock increase that supports the move? Did supply tighten? Or was the movement entirely disconnected from anything you can observe?

A few data points make this easier to track each month:

• Feedstock movements: Did ethylene or propylene move in a direction and size that explains the index change? If feedstocks were flat but your index moved, something else is going on.
• Spot market activity: Is the spot market confirming the index direction? If spot is flat or declining while your contract index moved up, the index may be lagging or overcorrecting relative to actual trading activity.
• Publisher commentary: Index publishers sometimes note adjustments or methodology changes in their weekly or monthly reports. Reading the commentary rather than just the headline number can surface corrections that aren't obvious otherwise.

Once you've identified an NMA, quantify it. How many cents did it add this month? Across your total volume, what's the dollar impact? That turns an abstract methodology question into a specific number you can bring to a conversation.

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Building a Resin Non-Market Adjustment Strategy

Identifying NMAs matters, but it doesn't save you money by itself. Acting on that information is what actually changes your cost position.

Start by building a record. Track every month's index change alongside the market fundamentals that should have driven it. Over six to twelve months, you'll have a documented pattern showing whether your index drifts consistently upward beyond what market movements justify.

When you spot an NMA, bring it to your supplier directly. You're not accusing them of anything, since the adjustment came from the publisher, not from your supplier. But they are passing it through, and asking whether the contract should absorb the full cost of a correction that doesn't tie to a market event is a perfectly fair question.

Longer term, it's worth thinking about how your contracts handle NMAs structurally. Some buyers negotiate contract language that distinguishes between market-driven price movements and publisher-initiated corrections. Others build in reopener clauses triggered when cumulative NMAs exceed a threshold. These provisions cost nothing to include at signing but give you a mechanism to address drift without renegotiating the entire agreement.

Consider broadening your benchmarks too. If your contract is tied to a single index, you have no way to check whether that index's NMA reflects broader market conditions or is specific to that publisher's methodology. Cross-referencing against a second index or against real transaction data gives you an independent check that strengthens your position — and it also helps you see whether hidden margin erosion is building across your contracts more broadly.

Protect Your Margins from Non-Market Adjustments with ResinSmart

NMAs are one of those costs that stays invisible until you start looking for them. ResinSmart gives procurement teams the market data and transaction benchmarks to tell when an index adjustment is market-driven and when it's a methodology correction that doesn't belong on your invoice.

Start your free trial today and see how your contract pricing tracks against the fundamentals that should actually be driving it.

FAQ: Resin Non-Market Adjustment Strategy

What is a non-market adjustment in resin pricing?

A non-market adjustment is a resin pricing correction that an index publisher applies when their published price has drifted from actual transaction values. NMA polyethylene corrections and similar adjustments shift the index independently of supply, demand, or feedstock fundamentals. Every index-linked contract absorbs the change, which can move pricing by 10 to 30 cents per pound in a single reset.

How can resin buyers identify an NMA on their invoice?

Resin buyers can identify a non-market adjustment by comparing the index movement on their invoice to observable market fundamentals during the same period. If the index changed but feedstock prices were flat, spot pricing didn't confirm the direction, and no supply disruption occurred, the movement likely reflects a resin pricing correction through publisher methodology rather than an actual market shift. Tracking this through an invoice audit catches adjustments that would otherwise go unnoticed.

Do NMAs in resin pricing favor suppliers or buyers?

Non-market adjustments in resin pricing historically favor suppliers. Upward NMAs occur more frequently, carry larger magnitude, and get applied to contracts faster than downward corrections. Over time, this creates a persistent upward drift in pricing that doesn't correspond to market fundamentals, quietly eroding buyer margins without the pricing transparency most contract pricing clauses assume.

Can resin buyers negotiate contract protection against NMAs?

Resin buyers can negotiate contract provisions that address non-market adjustments, including reopener clauses triggered when cumulative NMAs exceed a defined threshold and language that separates market-driven index movements from publisher methodology corrections. These protections work best when included during initial contract negotiation rather than added after an NMA has already hit.

How much do non-market adjustments cost resin buyers annually?

The annual cost of non-market adjustments depends on volume and NMA magnitude. A 5-cent NMA on 10 million pounds of annual volume adds $500,000 in resin hidden cost with no underlying market justification. Buyers who don't track NMAs separately from regular index movements often absorb these costs without realizing they're paying for a methodology correction rather than a market shift.