Ero Copper is trading at $30.85, down 4.16%; no clear company-specific announcement explaining the October 29 decline was found. - One report noted a 0.9% LME copper retreat amid AI-demand concerns and rising U.S. inventories; other coverage described tight Chinese supply. Neither establishes a direct cause for Ero Copper’s move. - U.S. markets were lower, especially the Nasdaq, but the supplied index moves do not show a clear broad-market explanation for the stock’s decline.