Although ETFs trade just like stocks, instead of ''shares'' investors are actually buying and selling ''units'' — which are routinely created or destroyed to accommodate investor demand. We monitor these changes, to keep a lookout for ETFs experiencing notable inflows (many new units created) or outflows (many old units destroyed).

Sort the report below alphabetically or by change week over week, or day over day. Click the links labeled ''expand'' to see which individual ETFs contributed to the total flow numbers. Click through on any category name to learn more about the ETFs in that category.