TOLZ is the first pure play infrastructure ETF to strictly select global companies based on cash flows, instead of revenues, like its peers. For inclusion in the fund, over 70% of a company's cash flows must be derived from infrastructure-related businesses, which include airports and companies engaged in storage and transportation, water and toll roads. The fund also breaks from its peers in that it's eligible to hold up to 25% directly in MLPs, although it doesn't distribute K-1s for tax reporting. The Index is rebalanced semi-annually in June and December and reweighted quarterly starting every March.