In the last trading session, U.S. stocks ended on a weaker note as the result of a slump in industrials and materials stocks, ending the recent rally. Among the top ETFs, investors saw SPY go down 0.32%, DIA lose 0.34% and QQQ shed 0.38% 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: EDC: Volume 3.69 times average This leveraged emerging market ETF was under the microscope yesterday as nearly 2 million shares moved hands. This compares to an average trading volume of 533,000 shares and came as EDC lost 3.8% in the session. The big move can largely be blamed on fresh concerns related to emerging markets, particularly in China. In the last one-month period, EDC was up about 13.8%. TIP: Volume 2.61 times average The U.S. TIPS ETF was under the spotlight yesterday as almost 2.7 million shares moved hands. This compares to an average trading day of 1 million shares. TIP gained about 0.1% in the session. The movement can largely be attributed to risk-off trade sentiment and skepticism in the market, which can have a big impact on the U.S. TIPS like the ones we find in this ETF portfolio. TIP was up over 1.7% in the past one-month period. Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report DIR-EM BULL3X (EDC): ETF Research Reports ISHARS-TIPS BD (TIP): ETF Research Reports NASDAQ-100 SHRS (QQQ): ETF Research Reports SPDR-SP 500 TR (SPY): ETF Research Reports SPDR-DJ IND AVG (DIA): ETF Research Reports To read this article on Zacks.com click here. Zacks Investment Research Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report