1. On 05/18/2026, Commerce published in the Federal Register its initiation of the countervailing duty investigation of tris(hydroxymethyl)aminomethane from the People's Republic of China (China) (91 FR 28559). The effective date of this initiation is 05/11/2026 (the applicable date stated in the FR notice). 2. The merchandise subject to this investigation is tris(hydroxymethyl)aminomethane (Tris), also commonly referred to as tromethamine or THAM, and its derivative, tris(hydroxymethyl)aminomethane hydrochloride (Tris HCl), also commonly referred to as Tris hydrochloride or tromethamine HCl. Tris and Tris HCl are organic compounds with molecular compositions of C4H11NO3 and C4H11NO3ꞏClH, respectively. The scope includes all grades, purities, and forms of Tris and Tris HCl, which vary based on the raw materials (nitromethane and formaldehyde) used in the production process and the end use application required. Tris and Tris HCl are packaged and sold in different forms and sizes; however, all Tris and Tris HCl are covered regardless of form or packaging. The Tris and Tris HCl covered by this investigation are chemical compounds with the Chemical Abstract Service (CAS) numbers 77-86-1 and 1185 53-1, respectively. The country of origin of the subject merchandise in this investigation is based on the country where the Tris molecule is manufactured. As a result, Tris HCl manufactured in a third country using Tris produced in China is subject to the investigation. In addition, reprocessing Tris or Tris HCl in a third country by, for example, recrystallizing, retesting, or repackaging the merchandise does not remove the product from the scope of this investigation. Tris and Tris HCl covered by the scope of this investigation are currently classified under Harmonized Tariff Schedule of the United States (HTSUS) subheading 2922.19.9690. Although the HTSUS subheading and CAS numbers are provided for convenience and customs purposes, the written description of the scope is dispositive. 3. This proceeding has been assigned case number C-570-231. 4. If there are any questions by the importing public regarding this message, please contact the Call Center for the Office of AD/CVD Operations, Enforcement and Compliance, International Trade Administration, U.S. Department of Commerce at (202) 482-0984. CBP ports should submit their inquiries through authorized CBP channels only. (This message was generated by OVIII: SS.) 5. There are no restrictions on the release of this information. Alexander Amdur