IYK tracks an index of US companies in the consumer staples sector, as defined by its index provider. These would include companies whose businesses tend to be less sensitive to economic cycles and whose customers purchasing habits are non-cyclical in nature. Companies that manufacture, distribute, and/or retail food, beverages, other non-durable household goods, drug-retailing companies as well as agriculture, fishing, ranching and milling companies may also be included. The index uses market-cap to select and weight its constituents. Companies from all capitalizations are eligible, and individual securities within the portfolio are capped at 22.5% at each quarterly rebalance. Aggregate weight of all companies with weight exceeding 4.5% is capped at 45%. Prior to September 20, 2021, the fund tracked the Dow Jones U.S. Consumer Goods Index and was named iShares U.S. Consumer Goods ETF.