The SPDR S&P Oil & Gas Equipment & Services ETF (XES) outperformed other ETFs this week, up about 4.4%. Components of that ETF showing particular strength this week include shares of Exterran Holdings (EXH), up about 19% and shares of Nabors Industries Limited (NBR), up about 10.8% on the week.

And underperforming other ETFs this week is the Solar Energy ETF (KWT), down about 5.9% this week. Among components of that ETF with the weakest showing for the week were shares of Yingli Green Energy Holding (YGE), lower by about 16%, and shares of Trina Solar Limited (TSL), lower by about 13.8% on the week.

Other ETF standouts this week include the Junior Gold Miners ETF (GDXJ), outperforming this week with a 4.1% gain. And the SPDR S&P Transportation ETF (XTN) was an underperformer, falling about 3.2% this week.