According to Yahoo!Finance, The Invesco Solar ETF (TAN), “…seeks investment results that correspond generally to the performance, before the fund's fees and expenses, of an equity index called the MAC Global Solar Energy Index. The fund will invest at least 90% of its total assets in common stock, ADRs and GDRs that comprise the index and depositary receipts representing common stocks included in the index.”
The Study of Failure
“In the stock market, I classify all mistakes in one of two categories. There are the “intelligent” mistakes, and there are the “stupid” mistakes (Russell, Richard. Dow Theory Letters. February 6, 1976. page 3.).”