In the last trading session, Wall Street offered an upbeat performance. Among the top ETFs, SPY gained 1.57%, DIA added 1.27% and QQQ moved about 2.72% higher 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.

RPG: Volume 3.27 Times Average

This S&P 500 pure growth ETF was in the spotlight as around 471,499 shares moved hands compared with an average of 144,380 shares a day. We also saw some price movement as RPG added 1.51% in the last session. RPG was up 14% over the past month.

XHS: Volume 7.83 Times Average

This healthcare services ETF was under the microscope as nearly               41,459 shares moved hands. This compares with an average trading volume of roughly 7,830 shares and came as XHS gained 1.1% in the last trading session. XHS was up 1.10%.

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