In the last trading session, the U.S. stocks managed to hold onto gains in what was overall a rocky session. Notably, Dow Jones and the S&P 500 recorded their biggest intraday reversals in four years. Among the top ETFs, investors saw (SPY – ETF report) gain 1.5%, (DIA – ETF report) rise 1.3% and (QQQ – ETF report) move higher by 1.7% 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 ones to watch out for in the days ahead to see if this trend of extra-interest continues:

(EDV – ETF report): Volume 4.08 times average

This long-term Treasury ETF was in focus on Friday as more than 239,000 shares moved hands compared with an average of roughly 62,000 shares. We also saw some price movement as EDV gained 0.9% in the last session.

The big move was largely the result of the weak jobs report that pushed down yields and raised the appeal for the safe haven investments. In the past one-month period, EDV was up nearly 2.8% and has a Zacks ETF Rank of 2 or ‘Buy' rating with a High risk outlook.

(PXH – ETF report): Volume 3.74 times average

This emerging ETF was under the microscope on Friday as about 1.3 million shares moved hands. This compares with an average trading day of around 362,000 shares and came as PXH gained 3.1% in the session.

The movement can largely be blamed on investors' return to emerging markets on a weaker-than-expected job data that might delay the prospect of a rates hike and can have a big impact on the emerging market stocks like what we find in this ETF's portfolio. PXH was up 2.6% in the past one month and currently has a Zacks ETF Rank of 3 or ‘Hold' rating with a Medium risk outlook.

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