The fund offers concentrated exposure to US utilities giants. It tracks an index comprising companies that produce, generate, transmit or distribute electricity or natural gas as identified by GICS. To replicate the performance of the underlying index, the fund substantially invests all of its assets in another ETF, Utilities Select Sector SPDR Fund (XLU-US). As part of the S&P Select Sector Index suite, the index draws its holdings from the S&P 500 Index, so its portfolio mainly favors large caps. Holdings are weighted by market capitalization, subject to a capping methodology that ensures no single security exceeds 25% at each quarterly rebalance.