Containerboard Pricing: The Independent Converter Under Pressure

November 6, 2026

A few months ago, I compared the independent sector of the containerboard market to the wagging tail of a dog dominated by integrated producers. Well, that tail is now wagging vigorously.

Fastmarkets’ September price assessment recognized a $70-per-ton increase in unbleached kraft linerboard and a $100-per-ton increase in corrugating medium. According to Fastmarkets-published Price Watch, its current domestic price range for unbleached kraft linerboard is approximately $1,110–$1,120 per short ton as of September 26. This latest increase follows approximately $100 per ton of linerboard increases that Fastmarkets had already recognized earlier in 2026. The result is a remarkably rapid increase in containerboard pricing during a relatively short period of time.

Independent boxmakers are understandably concerned that this latest increase will be difficult to pass through to customers. The consequences could include lost customers, reduced margins, or both. Customers facing substantial box price increases may begin looking for alternative suppliers or even alternative packaging solutions.

The Price-Fixing Litigation

At the same time, the judge in the most recent price-fixing case against the integrated producers—Artuso Pastry Foods Corp. v. Packaging Corporation of America, et al.—has allowed the case to move forward to discovery, rejecting the defendants’ motions to dismiss.

The court found that the plaintiff’s allegations, considered as a whole, were sufficient to make the inference of a conspiracy plausible. Among the factors cited were:

The complaint identifies six substantially parallel price increases over approximately five years.
The increases allegedly occurred under materially different economic conditions.
The plaintiff alleges capacity reductions or restrictions by some defendants in addition to the parallel pricing.
The containerboard industry is highly concentrated, with the complaint alleging that the major defendants collectively control approximately 85% or more of the market.
The defendants’ explanations, particularly increased demand and higher input costs, did not provide an obvious and comprehensive explanation for the timing of the alleged price increases at the motion-to-dismiss stage.

It is important to emphasize that the judge did not find that price fixing occurred. The ruling simply held that the allegations were sufficiently plausible for the case to proceed to discovery.

Based on my limited understanding of antitrust law, the plaintiffs ultimately will have to establish an unlawful agreement among the defendants; parallel pricing resulting from a common response to market conditions is not, by itself, proof of collusion. That will be difficult to establish because these companies have experienced counsel and presumably take considerable care to avoid conduct that could create antitrust exposure.

The case will likely take years to work its way through the courts. I also would not expect the current Justice Department to become involved absent additional facts or circumstances that would warrant government action.

One issue that I expect the defendants to raise is Fastmarkets’ survey of transacted containerboard prices and its practice of independently evaluating announced price increases.

The Fastmarkets Question

Most industry observers I speak with consider Fastmarkets’ survey of transacted containerboard prices to have significant limitations. Relatively little containerboard is freely traded, and many of the truly independent buyers of containerboard do not provide transaction information to Fastmarkets. In a market dominated by integrated producers, this makes determining a representative “market price” particularly difficult.

Interestingly, on September 3, immediately following the judge’s ruling in the price-fixing case, Fastmarkets issued a proposal for a Corrugated Cost Benchmark (CCB) for North America. Fastmarkets describes the proposed CCB as a benchmark designed to measure changes in the principal costs associated with manufacturing and delivering corrugated boxes. It would combine Fastmarkets’ virgin and recycled fiber price data with third-party measures of labor, energy, chemicals, maintenance, other manufacturing costs, and transportation. The proposed index would use January 2019 as a base of 100 and apply fixed weights to the various cost components. As of press time, Fastmarkets has proposed an October 19 launch, subject to its industry consultation.

This is an interesting development. The proposed CCB does not purport to establish the actual cost or selling price of a corrugated box. Rather, it is intended to measure changes in a modeled industry-average basket of costs. In my view, this type of cost-based benchmark could ultimately be more useful to the industry than a survey of transacted containerboard prices in a market where relatively little containerboard is freely traded.

It also raises an interesting question in light of the current litigation: How much of the industry’s price increases can be explained by changes in underlying costs? A credible cost-input model could provide an objective framework for analyzing that question. For example, if the cost of producing and delivering a corrugated box increased by 5%, while containerboard prices increased by 15%, the difference would warrant examination. It would not, by itself, establish that the price increase was improper or the result of collusion. Conversely, if the underlying cost index increased by approximately the same amount as market prices, that would provide evidence of a different kind.

My conjecture is that Fastmarkets recognizes the difficulty of being in the middle of a pricing system in which its published containerboard prices are referenced in a significant number of integrated pricing agreements, as well as agreements used by independent converters. The proposed cost benchmark may provide a more objective way of measuring changes in the underlying economics of the corrugated industry. It remains to be seen whether or how Fastmarkets will use the new cost benchmark in conjunction with its existing containerboard price assessments.

If I were advising Fastmarkets, I would suggest that it consider moving away from its survey of transacted containerboard prices and focus increasingly on the underlying cost inputs. In my opinion, a transparent, consistently calculated cost index would be more useful to the industry than attempting to establish a representative transaction price in a market where relatively little product is freely traded.

The Pressure on Independent Converters

In the face of these unprecedented containerboard price increases, independent converters will face enormous pressure to retain customers while protecting margins. Intense price competition may cause independent converters to lose business to other independent converters or to integrated producers. Although mill capacity is well documented, converting capacity has never been measured adequately. Most industry observers nevertheless believe that corrugator and finishing capacity has expanded significantly in recent years, giving customers more alternative suppliers. As a result, many independent converters may be forced to choose between giving up business and reducing margins to retain it.

One can only hope that integrated producers do not view the current situation as an opportunity to use the dramatic increase in containerboard prices—and the resulting pressure on independent converters—as a way to lower existing box prices in order to capture additional business. That would put the independent converter in an especially difficult position: paying more for its principal raw material while being pressured to maintain or reduce the selling price of the finished box.

Is There Such a Thing as a ‘Fair’ Containerboard Price?

It is difficult to determine what constitutes a fair price for containerboard in the absence of a freely traded marketplace. There are regulated or highly transparent markets for many major commodities in North America, where buyers and sellers can reference established market prices and, in many cases, purchase contracts for future supply. Containerboard is different. It is a commodity ultimately used by virtually every manufacturing and distribution business, but a relatively small number of producers control the overwhelming majority of the supply. Those producers are now involved in price-fixing litigation, and I believe there is a significant possibility of additional litigation in the future. The dollars involved are large enough to attract major law firms, and the optics surrounding repeated large price increases are difficult to ignore.

Independent vs. Integrated Business

My personal view of the marketplace is that there will always be an independent business and an integrated business, with an equilibrium developing between the two. Independent converters generally do better with customers who place a premium on attributes such as tight delivery schedules, managed inventory, packaging that requires multiple machines or off-line processes, smaller quantities, smaller blank sizes, high graphics, handwork, assembly, and fulfillment. Integrated producers generally look for larger customers, longer runs, single-machine finishing, and larger blank sizes. These operations tend to be larger and more efficient. Their price points may be lower, but their increased efficiencies—and their integration from the mill through the corrugator and converting operation—can more than compensate for the lower selling price.

Independent converters therefore need to charge more in many circumstances because they provide a higher level of service and operate with lower inherent efficiencies. There is certainly a substantial amount of business that crosses over between these two models. But over time, I believe an equilibrium develops. Customers may be able to obtain a lower price by switching suppliers, but they may ultimately discover that the lower price comes with a lower level of flexibility, responsiveness, or service.

Where Does the Market Go From Here?

No one can say with certainty what a fair price for containerboard should be in the absence of a freely traded marketplace.

The integrated producers have taken substantial hits to their balance sheets and bottom lines by shuttering capacity over the past several years in an effort to bring pricing back to levels they consider acceptable. Those capacity reductions are now having a meaningful effect on supply availability.

The question is whether current pricing levels are sufficient for producers to achieve the returns they are seeking—or whether additional increases will continue.

My hope is that the integrated producers conclude that current pricing levels are more in line with their expectations and allow the marketplace to return to some semblance of stability and equilibrium.

For independent converters, that stability cannot come soon enough.