So if the QQQQ declines by 1%, then the UltraShort QQQ gains 2%.

FORBES: Magazine Article

The Powershares QQQ Trust ( QQQQ) tracks the Nasdaq 100 index, which has been the strongest US market sector.

FORBES: Tsunami Impacts Weaker Markets

Chart Analysis : The strongest market index since the summer lows has been the Nasdaq 100, as represented by the Powershares QQQ Trust ( QQQQ), but it has given up leadership over the past few weeks.

FORBES: Stocks Bounce Off Lows, So What's Next?