The key U.S. equity gauges were mixed on Thursday. Among the top ETFs, investors saw (SPY Quick QuoteSPY - Free Report) gain about 0.1%, (DIA Quick QuoteDIA - Free Report) advance about 0.2% and (QQQ Quick QuoteQQQ - Free Report) move lower about 0.4% 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, in the most recent trading session, both these funds experienced volume levels that were more than double their average. This could make these ETFs the ones to watch out for in the days ahead to see if this trend of extra interest continues:

(EES Quick QuoteEES - Free Report) : Volume 5.29 times average

This U.S. small-cap earnings-generating companies’ ETF was in focus yesterday as almost 150,000 shares moved hands compared to an average of roughly 28,650 shares. We also saw some stock price movement as EES was down about 0.6%.

The movement can largely be attributed to a slight slowdown in small-cap companies’ earnings, though the space looks to be benefiting from Trump’s presidency. In the last one-month period, EES was up just 0.5%. The fund carries a Zacks ETF Rank #3 (Hold).

(RTH Quick QuoteRTH - Free Report) : Volume 3.19 times average

This retail ETFwas in focus yesterday as roughly 72,000 shares moved hands compared with an average of roughly 22,000 shares. RTH lost about 0.7% on the day.

Retail sales, especially in the brick and mortar segment, came under pressure lately due to the rising tide in online sales. In the last one-month period, RTH was up about 3.2%.

Want key ETF info delivered straight to your inbox?

Zacks’ free Fund Newsletter will brief you on top news and analysis, as well as top-performing ETFs, each week. Get it free >>