At the 2016 Nuclear Security Summit Argentina and the United States announced that Argentina completed elimination of all highly-enriched uranium that remained in the country.
According to GTRI data, most of the material was removed to the United States in 2001-2007. However, about 4 kg of HEU remained in the country, since it was ineligible for take back. At the Nuclear Security Summit Argentina announced that it down-blended and disposed of that material. As a result, Argentina (and indeed the entire Latin America and Caribbean region) is now considered HEU free.