I'm not aware of any "simply short" ETF. It kind of doesn't make sense. Lets say you've got the underlying asset at $100, what price should the "short" asset be

I'm not aware of any "simply short" ETF. It kind of doesn't make sense. Lets say you've got the underlying asset at $100, what price should the "short" asset be? $100? Well, what happens when the underlying goes to $200, or $300, or $400? The short can't just go to $0, -$100, -$200, -$300. Negative-priced ETFs just don't work (no one will pay up!!) Instead, "short ETFs" are composed of futures and/or options that move "as if" they were short against the stock. In cases of a rising bull market, the short position is "regularly wiped out" (hits $0), and the assets can rebalance to the new value of the underlying.