SHLD seeks defense technology companies worldwide that provide the products and services necessary for governmental organization's threat preparedness and response. The investment thesis is based on governments becoming increasingly reliant on advanced military systems requiring specialized hardware, sensors, and other networking solutions. Selection begins by focusing on pure-play companies whose revenue comes from FactSet-identified defense tech sub-themes. This includes cybersecurity, artificial intelligence, big data, augmented reality, advanced military systems, as well as hardware like robotics, fuel systems, and aircraft. Firms tied to non-military firearms and commercial aircraft manufacturing are not considered. The top 50 securities are selected and weighted by market-cap with individual security weights capped at 8%. Index reconstitution and rebalancing is done on a semi-annual basis.