According to the U.S. Federal Register, the investigation was initiated by the DOC on March 24, 2025, with a preliminary conclusion issued on September 24, 2025, after being postponed from the original deadline of July 18, 2025.
The products under investigation are automotive chassis and chassis assembly components originating from Vietnam. The DOC determined that Vietnamese manufacturers exported these products to the U.S. at prices lower than their “fair value.”
Two entities specifically named in the conclusion are Thaco Special Vehicles Manufacturing and Thaco Industries Trailers and Heavy Steel Structures. The U.S. investigating agency combined both companies into a single entity (THACO) for the investigation.
The DOC stated that THACO is the only Vietnamese enterprise subject to separate examination. After analysis, the agency calculated a dumping margin and imposed a preliminary duty rate of 511.16%—a record-high temporary tariff for cases involving heavy industrial products from Vietnam.
Notably, the DOC applied this duty rate to all chassis exports from Vietnam, despite acknowledging Vietnamese companies’ cooperation during the investigation.
However, this is only a preliminary conclusion. THACO, founded by billionaire Trần Bá Dương, requested the DOC to postpone the final conclusion and extend temporary measures for up to six months. The DOC approved this request, announcing that the final decision will be issued within 135 days of the preliminary conclusion.
In similar investigations involving other countries, Mexico faced a preliminary anti-dumping duty of 32.37%, while Thailand faced rates ranging from 46.12% to 181.57%, depending on the company.
– 4:58 PM, October 6, 2025
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