This ETF tracks the MSCI USA Energy 20-35 Custom Index, which measures the performance of major and medium-sized American companies operating within the GICS-defined Energy sector. Constituents are weighted based on their free-float adjusted market capitalization, with diversification caps: the largest single entity's weight is limited to 35%, while all other individual holdings are capped at 20%. A 10% buffer is applied to these thresholds during the index's quarterly rebalancing.