What Is an Inverse ETF and How Does It Work?

The Complete Answer

An inverse ETF is designed to move opposite to its benchmark: when the index falls 1% on a given day, the fund aims to rise about 1%, and vice versa. SH (inverse S&P 500) and SQQQ (a 3x inverse Nasdaq-100 fund) are common examples. They use derivatives like swaps and futures to manufacture that opposite exposure.

They exist as short-term tools to hedge a portfolio or to bet on a decline without formally short-selling. The critical word is short-term: inverse funds reset their exposure every single day, so they track the index's daily move, not its cumulative move over weeks or months.

That daily reset causes "decay." In a choppy market that ends flat, an inverse fund can still lose value steadily because the daily gains and losses compound against the holder. Over a longer stretch an inverse fund can fall even when the index it is betting against also falls — an outcome that surprises people who treat it as a buy-and-hold short.

For these reasons inverse ETFs are unsuitable for beginners and for long-term portfolios. The historically proven response to market declines is far simpler: hold broad, diversified funds, keep buying through downturns, and let recovery do the work. Trying to profit from crashes with inverse funds usually costs more than the crashes themselves.