SILJ tracks an index of smaller stocks from around the world that derive revenues, have market share or are engaged in silver exploration/development. To determine silver revenue percentages, securities are assigned a Metals Focus sector (e.g., Project Development, Silver Mining, Streaming, Diversified Mining, etc.). The fund calculates a theme-adjusted free-float market value for each security based on their market cap and Metals Focus. Pure-play companies are overweighted after initial weights are determined based on the securitys theme-adjusted free float market value divided by the aggregate value of all securities. The portfolio is then adjusted based on market cap, subject to constraints. The index is reconstituted semi-annually and rebalanced quarterly. Prior to Jan. 29, 2024, the fund was called ETFMG Prime Junior Silver Miners ETF that tracked the Prime Junior Silver Miners & Explorers Index. Prior to May 3, 2024, the fund tracked the Nasdaq Metals Focus Silver Miners Index.