In the last trading session, U.S. stocks were in the green. Among the top ETFs, investors saw SPY gain over 1.2%, DIA advance about 1.3% and QQQ move higher by about 1.4% 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 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:

(HEWJ - ETF report): Volume 7.11 times average

This currency-hedged Japan equities ETF was in focus yesterday as roughly 6.76 million shares moved hands compared with an average of roughly 949,650 shares. As the Japanese currency yen lost strength in the wake of intervention warnings from Tokyo following the currency's fast ascent, Japanese equities soared.  We also saw some price movement as shares of HEWJ returned about 3.5% yesterday. The fund has a Zacks ETF Rank #2 (Buy). In the last one month, HEWJ was up about 5.7%.

(GREK - ETF report): Volume 3.18 times average

This Greece ETF was under the microscope yesterday as nearly 1.19 million shares moved hands. This compares to an average trading day of 375,920 shares and came as GREK added about 1.8% in the session.

The movement was due to talks between Greece and its Eurozone creditors about easing the former’s debt burden. GREK was up over 18.5% in the past one-month period.