There’s greater concentration in the biggest names. The total value of assets under management ( AUM ) by the world 's biggest 500 managers rose 40 % last year to $ 93.8tn , according to the Willis Towers Watson 's Thinking Ahead Institute . The Global 2000 research also showed that 43 % of AUM were managed by the 20 largest firms , marking the highest level since 2000 . BlackRock was the largest firm in the rankings , followed by Vanguard and State Street .
The total value of assets under management ( AUM ) by the world 's biggest 500 managers rose 40 % last year to $ 93.8tn , according to the Willis Towers Watson 's Thinking Ahead Institute . The Global 2000 research also showed that 43 % of AUM were managed by the 20 largest firms , marking the highest level since 2000 . BlackRock was the largest firm in the rankings , followed by Vanguard and State Street .