截至10月30日，全球最大白银ETF——iShares Silver Trust的白银持仓量为15189.82吨，较前一交易日减少19.75吨

Core Insights - The iShares Silver Trust, the world's largest silver ETF, reported a silver holding of 15,189.82 tons as of October 30, which represents a decrease of 19.75 tons from the previous trading day [1] Group 1 - The current silver holding of iShares Silver Trust is 15,189.82 tons [1] - The decrease in silver holdings is 19.75 tons compared to the previous trading day [1]