In the last trading session, the U.S. stocks ended the week lower ahead of the crucial Fed meeting. Among the top ETFs, investors saw (SPY – ETF report) lose 1.9%, (DIA – ETF report) shed 1.8% and (QQQ – ETF report) move lower by 2.3% 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:

(HYG – ETF report): Volume 5.71 times average

This high yield ETF was in focus on Friday as about 54.2 million shares moved hands compared with an average of roughly 10.5 million shares. We also saw some price movement as HYG lost 2% in the last session.

The movement can largely be blamed on chances of an interest rate hike in the Fed meeting this week that can have a big impact on high yield bonds like what we find in this ETF portfolio. For the past one-month period, HYG was down nearly 3.7% and currently has a Zacks ETF Rank of 4 or ‘Sell’ rating with a High risk outlook.

(MGK – ETF report): Volume 3.91 times average

This large cap growth ETF was under the microscope on Friday as more than 448,000 shares moved hands. This compares with an average trading day of around 121,000 shares and came as MGK shed 2.2% in the session.

The big move was largely the result of increased volatility and heightened uncertainty in the market. MGK was down 0.4% in the past one month and currently has a Zacks ETF Rank of 3 or ‘Hold’ rating with a Medium risk outlook.