This ETF is one option available to investors seeking to bet on the oil equipment and services sector of the domestic energy market, making it appealing to those who believe that increased oil demand will spark a need for the services these companies provide. Given the targeted focus of IEZ, this fund may be too granular for many long-term buy-and-holders but can be useful for those looking to fine tune energy exposure or generally increase a portfolio's weight to this sector. Like many energy ETFs, IEZ leaves a bit to be desired as far as diversification goes. A small handful of stocks account for a major chunk of the underlying portfolio, making IEZ potentially sensitive to company-specific developments. XES exists as a more balanced alternative; that equal-weighted ETF includes similar stocks but in drastically different proportions.