Systems and methods for creating and maintaining multi-manager exchange traded funds. An embodiment of a method includes receiving a plurality of model portfolios, each created by a different portfolio manager and identifying a plurality of assets traded on a stock exchange. A portfolio composition file is created based at least in part on at least a portion of the model portfolios. The portfolio composition file identifies a set of constituent assets traded on the stock exchange. One or more authorized participants are authorized to trade the set of constituent assets for a creation unit of an exchange traded fund. The creation unit includes at least one share that is tradable on the stock exchange by both the authorized participant(s) and the investors.