Friday's ETF with Unusual Volume: RZG (3/15, 2:45 PM ET) -- The Invesco S&P SmallCap 600 Pure Growth ETF (RZG) is seeing unusually high volume in afternoon trading Friday, with over 315,000 shares traded versus three month average volume of about 25,000. Shares of RZG were up about 0.2% on the day.

Components of that ETF with the highest volume on Friday were Ascena Retail Group (ASNA), trading down about 28% with over 8.4 million shares changing hands so far this session, and Denbury Resources (DNR), down about 2.7% on volume of over 6.2 million shares. Nanometrics (NANO) is the component faring the best Friday, higher by about 7.6% on the day.

For MarketNewsVideo.com, I'm Sayoko Murase.