As ETFs become increasingly successful in gathering assets from ESG-oriented investors, it is no surprise that active managers have started to claim that serious ESG strategies need active management. Since we know that similar claims from active managers over plain vanilla ETFs have been proven wrong in the past, one has to check if the new claims are true. One of the major claims of the critiques is the fact that ESG indices, which are the basis for ESG ETFs, review their constituents only a few times a year and can’t in most cases react directly to controversies or scandals.