Method of creating and maintaining multi-manager exchange traded funds

A computer-implemented method comprising: receiving, by at least one computing device, first data on a first trading day over a computer network, the first data representing a plurality of different portfolio compositions and having been sent to the at least one computing device by a plurality of remote first computing devices; weighting, by the at least one computing device, each of the plurality of different portfolio compositions to obtain a plurality of weighted portfolio compositions; combining, by the at least one computing device, the plurality of weighted portfolio compositions to obtain a combined portfolio composition before a relevant stock market opens on a second trading day, the second trading day being consecutive with the first trading day; transmitting, by the at least one computing device, second data over the computer network to a management computing system when the relevant stock market is closed and before the relevant stock market opens on the second trading day, the second data identifying changes to current constituent assets of an exchange traded fund that produce future constituent assets, units of each of the future constituent assets being tradable on the relevant stock market when the relevant stock market is open, the management computing system making the changes to the current constituent assets on the second trading day when the relevant stock market is open; and transmitting, by the at least one computing device, third data over the computer network to a plurality of remote second computing devices when the relevant stock market is closed and before the relevant stock market opens on the second trading day, the third data identifying the future constituent assets to operators of the plurality of remote second computing devices, the third data being transmitted when the relevant stock market is closed and before the relevant stock market opens on the second trading day to prevent any of the operators from trading any units of the future constituent assets on the relevant stock market before the relevant stock market is open on the second trading day, each of the operators being able to trade a basket of constituent assets for a creation unit of the exchange traded fund starting on a third trading day, the third trading day being consecutive with the second trading day. MODELING ENTITY MOSELECTS IF NECESSARY, MANAGERS FUND MANAGER CONSTITUENT SEND MODEL 370 PORTFOLIOS TO MODELING ENTITY MARKETS OPEN 330 3n MOELING 360IT DNG