The three most actively traded ETFs have tumbled from their recent all-time highs and are trading below their 50-day moving average lines. SPDR S&P 500 (SPY) is 5% off its old high, set in December. IShares Russell 2000 (IWM) is 4% below its record, as is PowerShares QQQ (QQQ). Both the SPY and QQQ ETFs have a large-cap stock bent. But QQQ offers a much stronger tech stock tilt — 56% vs. SPY’s 17.7%.