In the last trading session, U.S. stocks were in the red due to the tech-induced sell-off. Among the top ETFs, investors saw SPY lose about 0.02%, DIA shed about 0.2% and QQQ move lower by about 0.5% 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 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:

(XLK Quick QuoteXLK - Free Report) : Volume 3.78 times average

This technology ETF was in the spotlight yesterday as nearly 35.7 million shares moved hands compared with an average of roughly 9.43 million shares a day. We also saw some price movement as XLK lost about 0.6% in the last session.

The move was largely the result of a steep slide in U.S. tech stocks on overvaluation concerns. XLK was down about 0.3% in the last one month.

: Volume 3.44 times average

This long-term U.S. Treasury bond ETF was under the microscope yesterday as about 220,000 shares moved hands. This compares with an average trading day of around 63,200 shares moving hands and came as TLO lost about 0.1% in the session.

The movement can largely be credited to higher bond yields ahead of the Fed meeting this week. Treasury yields rose on the probability of a quarter-point rate hike in the June Fed meeting. TLO has gained about 2.9% in the last one month.

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