19 CFR §207.14

Upon receipt by the Commission of notice from the administering authority under section 702(d) or section 732(d) of the Act that the administering authority has made a negative petition determination under section 702(c)(3) or section 732(c)(3) of the Act, the investigation begun pursuant to § 207.12 shall terminate. All persons who have received requests for information from the Director shall be notified of the termination.