Fund Description: 3D Printing ETF is an exchange-traded index fund or Index ETF which is a separate investment portfolio of the Ark ETF Trust, an open-end investment management company. INVESTMENT OBJECTIVE: The 3D Printing ETF seeks to provide investment returns that closely correspond to the price and yield performance of the Total 3D-Printing Index. INDEX DESCRIPTION: The Total 3D-Printing Index is designed to track the price movements of stocks of companies involved in the 3D printing industry. The Index is composed of equity securities and depositary receipts of exchange listed companies from the U.S., non-U.S. developed markets and Taiwan that are engaged in 3D printing related businesses within the following business lines: (i) 3D printing hardware, (ii) computer aided design (CAD) and 3D printing simulation software, (iii) 3D printing centers, (iv) scanning and measurement, and (v) 3D printing materials. The Index assigns a pre-determined weighting to each business line and all companies within each business line are equally weighted within the business line. At least 80% of the companies in the Index derive at least 50% of their earnings or revenues or at least 50% of their assets are devoted to the development or distribution of equipment, materials, and software primarily used in 3D printing or 3D printed products. In addition, at least 80% of the assets of the Fund will be comprised of companies that derive at least 50% of their earnings or revenues or at least 50% of their assets are devoted to the development or distribution of equipment, materials, and software primarily used in 3D printing or 3D printed products. FUND STRATEGY: The Fund normally invests at least 80% of its total assets in securities that are included in the Index, depositary receipts representing securities included in the Index or underlying stocks in respect of depositary receipts included in the Index. The Fund generally will use a replication strategy. A replication strategy is an indexing strategy that involves investing in the securities of the Index in approximately the same proportions as in the Index. However, the Fund may utilize a representative sampling strategy with respect to the Index when it might not be possible or practicable to purchase all of the securities of the Index in approximately the same proportions as in the Index. There also may be instances in which the Adviser may choose to underweight or overweight a security in the Index, purchase securities not in the Index that the Adviser believes are appropriate to substitute for certain securities in the Index or utilize various combinations of other available investment techniques in seeking to replicate as closely as possible the performance of the Index. The Fund may sell securities that are represented in the Index in anticipation of their removal from the Index or purchase securities not represented in the Index in anticipation of their addition to the Index. The Fund does not seek temporary defensive positions when markets decline or appear overvalued. FUND MANAGEMENT: ARK Investment Management LLC. serves as the inventment adviser to the Fund.