NEW YORK (MarketWatch) -- ProShare Advisors LLC, part of ProFunds Group, on Thursday listed four exchange-traded funds on the American Stock Exchange which seek to provide double the daily opposite return of the Nasdaq 100 Qs, S&P 500 SPY, S&P MidCap 400 and Dow Jones Industrial Average.

So you dont need to short on the market down side and meet margin requirment
The new ETFs are UltraShort QQQ ProShares (QID  opposite return  up if index down trend
UltraShort S&P 500 ProShares (SDS  opposite return up if index down trend
UltraShort MidCap 400 ProShares (MZZ  opposite return  up if index down trend
 and UltraShort Dow 30 ProShares (DXD  opposite return

Last month the company launched its first eight ETFs with four leveraged funds that seek to provide double the index return, and four that provide 100% of the inverse, or opposite, return. The four new ETFs listed Thursday give 200% of the daily return of the benchmarks

International REIT ETF issue

Hedge fund regulated and restrained