In the last trading session, U.S. stocks were in the red. Among the top ETFs, investors saw (SPY Quick QuoteSPY - Free Report) and (DIA Quick QuoteDIA - Free Report) losing about 2% and (QQQ Quick QuoteQQQ - Free Report) move lower by 2.3% on the day. Equities have been under pressure for quite some time now on slowing global growth, flattening the yield curve in the United States. 

Two more specialized ETFs are also worth watching 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 of the last trading session. This could make these ETFs ones to watch out for in the days ahead to see if this trend of extra-interest continues.

(BSV Quick QuoteBSV - Free Report) : Volume 4.45 times average

This short-term U.S. Treasury and agency obligations ETF was under the microscope yesterday as about 8.79 million shares changed hands. This compares to the average trading volume of around 1.98 million shares and came as BSV gained about 0.1% in the session.

The big move was probably the result of the latest decline in chances of a December rate hike.The fund has added about 0.4% in the past one month.

(VNQ Quick QuoteVNQ - Free Report) : Volume 3.08 times average

This real estate sector ETF was in the spotlight yesterday as nearly 20.3 million shares moved hands compared with an average of roughly 6.61 million shares a day. The fund lost about 3.88% in the last trading session.

The movement can largely be blamed on the slump in homebuilder sentiment in December to the lowest level in more than three years. For the month, VNQ is down about 5.3% in the past one month.

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