截至8月20日，全球最大白银ETF——iShares Silver Trust的白银持仓量为15305.76吨，较前一交易日减少33.9吨

Group 1 - As of August 20, the iShares Silver Trust, the world's largest silver ETF, reported a silver holding of 15,305.76 tons, which is a decrease of 33.9 tons compared to the previous trading day [1]