In the last trading session, Wall Street was downbeat. Among the top ETFs, (SPY Quick QuoteSPY - Free Report) lost 2.8%, (DIA Quick QuoteDIA - Free Report) retreated about 2.1% while (QQQ Quick QuoteQQQ - Free Report) moved 3.8% lower on the day.

Two more specialized ETFs are worth noting as both saw trading volume that was far outside of normal. In fact, both these funds experienced volume levels that were more than double their average for the most-recent trading session. This could make these ETFs the ones to watch out for in the days ahead to see if this trend of extra-interest continues.

(PNQI Quick QuotePNQI - Free Report) : Volume 4.55 Times Average

This internet ETF was under the microscope as about 104,080 on shares moved hands. This compares with an average trading volume of roughly 22,850 shares and came as PNQI lost more than 4% in the last trading session. PNQI is down 9% in a month’s time.

(BIS Quick QuoteBIS - Free Report) : Volume 3.05 Times Average

This inverse leveraged biotech ETF was in the spotlight as around 85,000 shares moved hands compared with an average of 27,600 shares a day. We also saw some price movement as BIS gained 4.7% in the last session. BIS has slumped 1.9% over the past month.