A federal antitrust lawsuit alleges that major PVC pipe manufacturers conspired to fix prices between January 2021 and May 2025, artificially inflating costs for contractors, builders, and other purchasers across the United States. The case, filed in August 2024 in the Northern District of Illinois, claims that ten leading manufacturers—including Atkore Inc., JM Eagle, Diamond Plastics Corp., and others—collectively controlled approximately 90% of the U.S. PVC pipe market and used a pricing information service to coordinate their pricing strategies, costing buyers millions in overcharges.
If you purchased PVC pipe for municipal water systems, electrical conduit, or construction projects during this period, you may be entitled to compensation from a pending settlement. The conspiracy allegedly involved the use of Oil Price Information Service (OPIS), which published the “PVC & Pipe Weekly” product containing detailed pricing data that defendants used to monitor competitor prices and align their own pricing strategies. This price-fixing scheme affected both large construction firms and smaller contractors, making PVC pipes—essential components in water infrastructure, electrical systems, and building construction—significantly more expensive than they should have been in a competitive market.
Table of Contents
- How Did the PVC Pipe Price-Fixing Conspiracy Allegedly Work?
- Which Companies Are Named as Defendants and What Market Share Did They Control?
- What Products and Purchases Are Covered by This Lawsuit?
- What Is the OPIS Settlement and How Much Compensation Is Available?
- What Are the Critical Dates and Deadlines for This Settlement?
- How Do You File a Claim in the OPIS Settlement?
- What About Claims Against the Manufacturer Defendants and Future Litigation Prospects?
How Did the PVC Pipe Price-Fixing Conspiracy Allegedly Work?
The defendants are accused of using a sophisticated mechanism to coordinate prices without explicit meetings or phone calls. OPIS’s “PVC & Pipe Weekly” pricing information service served as the hub of coordination, allowing participating manufacturers to see what competitors were charging and adjust their own prices accordingly. Rather than competing on price to win market share, the defendants allegedly maintained higher pricing across the industry, knowing that competitors would do the same. This type of price-fixing, while difficult to detect because it leaves minimal documentary evidence, has long been a target of antitrust enforcement because it directly harms purchasers. The alleged conspiracy affected two primary product categories: PVC municipal water pipes and PVC electrical conduit pipes.
A contractor purchasing materials for a water system upgrade in 2023, for example, would have paid inflated prices on both the primary PVC pipes and all related conduit materials because the entire supply chain was subject to coordinated pricing. The scheme persisted for over four years, allowing defendants to sustain artificially high profit margins while competition that would normally drive prices down was effectively eliminated. Unlike cartels that require secret meetings or written agreements, this information-based scheme could operate semi-publicly through a legitimate industry service. However, antitrust law recognizes that when competitors use available information to eliminate price competition and maintain artificially high prices, that conduct violates the Sherman Act, even without a formal agreement. The use of OPIS data to execute the scheme is what makes the alleged conspiracy particularly notable from a legal standpoint.
Which Companies Are Named as Defendants and What Market Share Did They Control?
The lawsuit names ten major PVC pipe manufacturers as defendants: Atkore Inc., Cantex Inc., Diamond Plastics Corp., Ipex USA LLC, JM Eagle, National Pipe and Plastics Inc., Otter Tail, Prime Conduit Inc., Southern Pipe Inc., and Westlake Corp. These companies collectively control approximately 90% of the U.S. PVC pipe market, meaning that the alleged conspiracy affected prices for nearly all PVC pipe purchased in the country during the conspiracy period. The dominance of these firms in the market made price-fixing especially harmful, as buyers had virtually no alternative suppliers to turn to for competitive pricing.
Oil Price Information Service (OPIS) itself is named as a defendant, though it has already settled for $3 million. OPIS’s role was helping the information exchange rather than actively participating in price-fixing decisions, but by providing detailed competitive pricing data on a weekly basis, it created an infrastructure that made coordination easier. A key limitation of the current OPIS settlement is that it does not resolve claims against the ten manufacturer defendants, meaning additional recoveries may be possible if those cases proceed to settlement or judgment. Buyers should be aware that the OPIS settlement covers only that company’s liability, not the broader conspiracy claims.
What Products and Purchases Are Covered by This Lawsuit?
The lawsuit specifically targets PVC municipal water pipes and PVC electrical conduit pipes, two of the most widely used applications for PVC in construction and infrastructure. PVC municipal water pipes are used in drinking water systems, wastewater treatment infrastructure, and irrigation projects across the country. PVC electrical conduit pipes protect electrical wiring in buildings, underground installations, and industrial facilities.
Because PVC is often the standard material chosen for these applications due to its durability and cost-effectiveness compared to metal alternatives, demand for these products is consistent and widespread. Any organization or contractor that purchased these products during the conspiracy period—January 1, 2021 through May 16, 2025—may have standing to file a claim. This includes municipalities and water authorities purchasing for infrastructure projects, electrical contractors and distributors buying conduit for building and industrial projects, plumbing contractors working on residential and commercial jobs, and general contractors who procured PVC materials as part of larger construction work. A municipality that installed miles of new PVC water pipe in 2023 for system upgrades, for example, would have paid the allegedly inflated coordinated prices for every foot of pipe purchased.
What Is the OPIS Settlement and How Much Compensation Is Available?
Oil Price Information Service reached a settlement agreement valued at $3 million, which was preliminarily approved by the court on July 15, 2025. This settlement amount is divided between two settlement classes: the End-User Settlement Class (companies and organizations that purchased PVC pipe directly from manufacturers or distributors for their own use) and the Non-Converter Seller Purchaser Settlement Class (distributors and resellers who purchased PVC pipe to sell to others). The settlement represents OPIS’s share of liability, but claims against the ten major manufacturer defendants remain pending and unresolved, meaning affected parties may eventually recover additional compensation if those cases settle or result in judgment.
The actual amount each claimant receives depends on how much PVC pipe they purchased during the conspiracy period and how many valid claims are filed. Early estimates suggest that claimants who purchased significant quantities of PVC materials during 2021-2025 could recover hundreds or thousands of dollars, though those with smaller purchases or more difficult documentation of purchases may recover less. A comparison to other antitrust settlements shows wide variation: some price-fixing settlements result in per-purchaser recoveries of just a few dollars, while others with larger settlement funds and fewer claimants yield amounts in the thousands. The actual value of the OPIS settlement won’t be clear until the court approves it and processes all claims.
What Are the Critical Dates and Deadlines for This Settlement?
The most pressing deadline is **April 9, 2026**—the exclusion deadline. This is the last date to opt out of the OPIS settlement, meaning the last day to remove yourself from the settlement class if you choose to pursue your own claim instead. After April 9, 2026, you will be bound by the settlement and eligible to submit a claim for compensation. If you believe you have a stronger individual claim or prefer not to participate, you must notify the settlement claims administrator before this date. Missing this deadline means you permanently lose the right to sue OPIS separately and must participate in the settlement process.
The **Final Fairness Hearing** is scheduled for June 3, 2026 at 10:00 A.M. Central Time in Courtroom 1425 at the Everett McKinley Dirksen Federal Courthouse in Chicago, Illinois. At this hearing, the judge will consider whether the settlement is fair, reasonable, and adequate, and will hear any objections from settlement class members. If the judge approves the settlement, it becomes final and binding, and claims processing typically begins shortly after. A significant limitation is that this settlement covers only OPIS; it does not resolve claims against the ten manufacturer defendants, so the overall litigation will continue beyond this date.
How Do You File a Claim in the OPIS Settlement?
To file a claim, you will need to submit documentation proving your purchase of PVC pipe during the conspiracy period (January 1, 2021 through May 16, 2025) along with the claimed amount or quantity purchased. Acceptable documentation typically includes invoices, purchase orders, receipts, or company records showing the date, quantity, type of PVC pipe, and price paid. If you made many purchases over multiple years, you may aggregate them, but you should gather the most complete documentation you can find. For large organizations with systematic purchasing records, this process is straightforward; for smaller contractors or one-time purchasers, it may require digging through old files or checking with suppliers for historical records.
The specific claim filing instructions, deadlines, and submission procedures will be detailed in the settlement notice and claims administrator information released after the June 3, 2026 fairness hearing. Most class action settlements provide a 60-90 day claims filing period after final approval. An important warning: keep all documentation and correspondence related to your claim. Settlement administrators often request additional information or verification, and having comprehensive records ensures your claim is processed accurately and quickly.
What About Claims Against the Manufacturer Defendants and Future Litigation Prospects?
The ten major PVC manufacturer defendants—Atkore, JM Eagle, Diamond Plastics, Westlake, and others—remain active defendants with unresolved claims against them. The OPIS settlement does not dismiss or reduce claims against these manufacturers; it is a separate settlement covering only OPIS’s liability. This means that the case will continue to progress against the manufacturers, and additional settlements or a jury verdict against those defendants could provide further compensation beyond the OPIS settlement. However, litigation against these major firms typically takes years to resolve, and there is no guarantee that additional settlements will be reached or that plaintiffs will succeed at trial.
The timeline for resolution against the manufacturer defendants remains uncertain, though discovery and motion practice continue in the case. Some observers expect additional settlements may be reached as the case progresses and defendants face mounting litigation costs, but others anticipate the case could proceed toward trial. Claimants in the OPIS settlement should not expect immediate payment; settlement processing typically takes several months to years depending on the complexity and number of claims. For those waiting for resolution of claims against the manufacturers, pursuing the OPIS settlement now is advisable, as it provides at least some recovery while the broader litigation continues.