As a levered product, USLX is not a buy-and-hold ETF, it's a short-term tactical instrument. The use of swap agreements opens investors to counterparty risk as well. Like many levered funds, it aims to deliver its 2x exposure only over a one-day holding period. Over longer periods, returns can vary significantly from their headline 2x target returns. The 500 underlying companies are some of the most well-known firms in the world and offer a broad exposure to the US large-cap market. But since the selection is committee based, some companies that we consider mid-cap may be included. The index is float-adjusted market cap weighted. Knowledge of the benefits, risks and pitfalls of levered products is paramount when investing in this fund.