The Claymore/MAC Global Solar Energy Index ETF (Ticker: TAN) seeks investment results that correspond generally to the performance, before fees and expenses, of the MAC Global Solar Energy Index. The index tracks globally-listed investable public companies that specialize in providing solar energy products and services. Companies in the index may be involved in (1) solar photovoltaic technology, which involves the conversion of sunlight into electricity through the photovoltaic process, or (2) thermal solar power, which involves using energy from the sun to heat fluids for purposes of water or space heating or to produce electricity. The index uses a modified market capitalization weighting methodology that at the quarterly review imposes a maximum weighting of 20% for any single stock and a 45% weighting maximum in the aggregate for stocks with a weighting of more than 4.5%. The index seeks to be a pure-play index by giving full weight to “pure-play” solar companies that derive at least two-thirds of their total revenue from the solar industry and a reduced weight to “medium-play” solar companies that derive between about one-third and two-thirds of their total revenue from the solar industry.