In the past trading session, U.S. stocks were in the green. For the top ETFs, investors saw (SPY Quick QuoteSPY - Free Report) gain 0.5%, (DIA Quick QuoteDIA - Free Report) move higher by 0.4% and (QQQ Quick QuoteQQQ - Free Report) gain 0.8% on the day.

Two more specialized ETFs are worth noting in particular though as both saw trading volume that was far outside of normal. In fact, both of 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 in the days ahead to see if this trend of extra-interest continues:

(MIDU Quick QuoteMIDU - Free Report) : Volume 3.4 times average.

This leveraged mid-cap ETF was in focus yesterday as roughly 172,000 shares moved hands compared to an average of roughly 51,000 shares. We also saw some share price movement as shares of MIDU gained 3%.

The outsized trading was due to the improved investor sentiment toward the economy after reports of easing trade tensions and dovish Fed minutes. For the month, MIDU is down 7.9%.

(VGSH Quick QuoteVGSH - Free Report) : Volume 3.3 times average.

This short-term government bond ETF was under the microscope yesterday as nearly 4 million shares moved hands. This compares to an average trading day of 1.2 million shares and came as VGSH gained 0.02%

The big move was largely the result of Fed officials comment that the future path of rate hikes is less clear given the uncertain global growth scenario and muted inflation. This is beneficial for bond ETFs. VGSH is up 0.3% in the past month; though shares currently have a Zacks ETF Rank #4 (Sell).

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