United States Antimony is trading 5.11% down now at $4.27, with broader risk-off market and materials-sector pressure the most likely explanation, not a confirmed company catalyst. - No new company-specific announcement explaining the September 28 decline appeared in available search results; the latest listed company news was dated September 16. - Reuters reported global stocks fell as oil jumped on stalled U.S.-Iran talks and investors positioned for higher interest rates.