Sigma Corporation: Welded Outlets for Customers, Couplings for Customs

The Sigma Corporation customs False Claims Act case produced a jury finding of more than $8 million in damages for antidumping duty evasion, before the law tripled the amount. Sigma sold Chinese welded outlets but declared them as steel couplings and said no antidumping duty applied. A competitor that had once supplied Sigma brought this customs fraud case.

How Do I Know If ADD CVD Applies?

An antidumping or countervailing duty applies to the goods its written order covers. Sigma’s welded outlets fell within the Chinese antidumping order because of their welded connection to a pipe. The threaded connection at the other end did not remove them from the order.

Sigma imported the outlets from China between 2010 and 2018. One end had a beveled edge designed to be welded to a pipe during installation. The other end accepted a sprinkler head or another threaded attachment. That physical construction mattered to which goods the order covered. The 1992 China order covered certain carbon steel butt-weld pipe fittings used for permanent welded connections.

The court’s account of the Sprink ruling explains why the threaded end was no escape. That ruling concerned nearly identical outlets from Taiwan under a companion order. The Department of Commerce had already rejected the argument that every connection had to be welded. It later treated that ruling as informative when deciding that the Chinese outlets were covered too. A curved edge did not take the fittings outside the order either.

This antidumping duty fraud cheated the American industry the order protected and taxpayers. A business paying the duty had to cover a cost Sigma avoided.

The Low-Cost Source That Replaced a Supplier

Island Industries knew Sigma as both a competitor and a customer. Its filed complaint alleged that Sigma stopped buying its outlets after finding a cheaper source:

The complaint described a price low enough to cost a supplier its customer, and it put the antidumping duty on Chinese welded outlets at 182.9%. The trial testimony explained the competitor’s inquiry: Island’s sales manager began looking into import rules because Chinese products kept undercutting its prices. He had no specialized trade-law experience. He searched online, contacted a Commerce analyst and found the China order and the Sprink ruling within 24 hours. He concluded that outlets like Sigma’s were likely covered.

The competitor trying to understand the price had checked the duty the importer had never investigated. For a business considering whether to report competitor customs fraud, the pattern is concrete: knowledge of the product and its price led to the discovery of the unpaid duty.

What Evidence Is Needed to Prove Fraud?

The evidence against Sigma connected the product it sold, the descriptions it sent to U.S. Customs and Border Protection and its failure to investigate before denying that duty applied. Its own catalog and website called the goods welded outlets. Its customs forms called them steel couplings.

The jury heard that Customs did not assess antidumping duties on steel couplings. That description removed a cost from the imports while the catalog continued to advertise the product by its familiar name. Expert testimony also explained why the separate declaration that no antidumping duty applied mattered: it tended to dissuade Customs from assessing the duty.

The complaint described a wider split between marketing and shipping language. It alleged that the defendants and their Chinese manufacturers used “welded outlets” openly in marketing but avoided the term in public shipping records. Those shipment records and customs entries contribute different pieces. Together, they can connect a familiar commercial product to the description used at the border.

A 2024 World Customs Journal study, Customs Tariff Classification and the Use of Assistive Technologies, describes companies storing commodity codes against material numbers, catalog numbers and stock keeping units. That gives product knowledge a practical use: the identifier familiar to sales or warehouse staff can connect the item to its customs classification. The useful knowledge may sit with someone who knows the catalog long before it reaches someone who knows the duty order.

An employee who knows the supply chain can add a different connection. According to the Sigma complaint, a former employee identified the Chinese supplier, the company arranging shipments and Ageis’s work on an alternative low-cost source. The whistleblower also alleged that Ageis knowingly helped Sigma describe Chinese grooved outlets as steel couplings to avoid antidumping duties.

The incentive to choose a nearby product category appears in trade studies too. Measuring Tariff Evasion and Smuggling, published in NBER Reporter in 2009, summarized findings from Hong Kong-to-China trade consistent with high-tariff goods being relabeled as similar goods carrying lower tariffs. The commercial attraction is clear in Sigma’s own descriptions: the customer still gets a welded outlet, while Customs gets a name that does not trigger the antidumping duty.

Does Fraud Require Intent to Deceive?

No. Sigma could be held responsible for deliberately ignoring the truth or recklessly disregarding it when declaring that no duty applied. The court focused on what Sigma actually believed and did when it made the declarations. What another importer might reasonably have believed could not replace that history.

The import executive’s testimony made the missing inquiry concrete. Sigma’s vice president overseeing imports said the company had never seen the China order or the Sprink ruling until 2017 or 2018, although both dated to 1992. He could not recall anyone reviewing the International Trade Commission’s periodic antidumping reviews or asking Commerce or Customs whether the imports were covered.

The jury had also heard that Chinese products, steel in particular, were frequently subject to antidumping orders. Sigma nevertheless declared that no antidumping duty applied without investigating. Its competitor’s quick discovery showed how readily the answer could be found. The different names in Sigma’s catalog and customs forms supplied another reason for the jury to conclude that the product had been knowingly misrepresented.

Sigma Owed the Duty Before Customs Finished the Bill

Sigma owed the antidumping duty when its goods arrived in the United States. The final calculation came later. Importers usually deposit estimated duties when goods enter, with the final bill fixed through customs liquidation. The amount can change, but the court held that the later calculation did not erase Sigma’s original obligation.

Sigma also tried to use the later liquidation to argue that its conduct had cost the government nothing. The court rejected that argument too. Closing the entries did not undo the government’s loss from Sigma’s false declarations. Customs’ own enforcement powers did not prevent a False Claims Act case over the unpaid duty.

Who Can File a Qui Tam Lawsuit?

A competitor can bring a qui tam case. Island Industries filed this one against Sigma, and the government declined to join it. Island took the case against Sigma to trial, where the jury found Sigma liable in 2021.

The law tripled the damages, and the court added civil penalties:

A whistleblower case under the False Claims Act can pay a customs fraud whistleblower reward of 15% to 30% of what the government recovers.

When the Business Knows the Product by Another Name

The Grosfillex case shows how purchasing and engineering information can expose the same split between the goods a business uses and the goods it describes to Customs. The government alleged in its settlement agreement that the company presented Chinese aluminum furniture components as finished furniture kits outside antidumping and countervailing duty coverage.

The whistleblower’s complaint alleged that imported barstool bases and backs would generally be separated and paired with different components in the United States. It quoted an engineering manager explaining the desired presentation:

The manager’s words show why purchasing and engineering knowledge mattered: the presentation to Customs was being discussed inside the business. In Sigma, the catalog and customs forms supplied the contrast. In Grosfillex, the complaint quoted the people discussing how to present it.

Sources

• Ninth Circuit Court of Appeals: amended opinion explaining Sigma’s customs fraud and the trial evidence, August 21, 2025
• Sixth Circuit Court of Appeals: opinion in Sigma’s later suit against Island, stating the judgment’s damages and penalties, February 29, 2024
• Department of Justice: Grosfillex settlement agreement accompanying the July 24, 2025 announcement
• World Customs Journal: Customs Tariff Classification and the Use of Assistive Technologies, 2024
• NBER Reporter: Measuring Tariff Evasion and Smuggling, 2009

Bring Us the Product You Know

If you know the product behind a customs description, or why a competitor’s price cannot cover the duty, speak with our whistleblower experts about the business you know. We build the case with you around the goods, the money and the decisions that connect them, and bring in customs fraud whistleblower lawyers who know antidumping disputes. We stay beside you from that first assessment through the outcome.