Guggenheim Solar ETF (NSYEArca: TAN)
AUM as of Nov. 8: $394.4 million
2013 growth: $228.5 million
Comment: TAN is the best performing ETF year-to-date, with a 146% return. The Guggenheim ETF tracks a group of large photovoltaic solar panel manufacturers, such as First Solar (NasdaqGS: FSLR).