SPSK is passively managed to track the performance, less fees and expenses, of the Dow Jones Sukuk Total Return (ex-Reinvestment) Index. The index includes USD-denominated investment-grade sukuk, which are financial certificates, similar to bonds, issued in the global markets and structured to comply with Islamic religious law commonly known as Sharia and its investment principles. Issuers of sukuk may include international financial institutions, foreign governments or agencies (including emerging markets). Sharia has certain restrictions regarding finance and commercial activities, SPSK holds securities screened to avoid investments in businesses such as tobacco, pornography, gambling and interest-based finance. The underlying index is reconstituted and rebalanced monthly.