Inside American Century's $128B ETF Surge | ETF Trends Key Takeaways Since that debut, the firm has rolled steadily forward with an eye firmly focused on innovation. Today, it offers nearly 50 ETFs — a mix of actively and passively managed — with $128 billion in assets under management. This year alone, ACI's ETFs have pulled in more than $16 billion in assets, almost all of it flowing into its active suites. But the road to becoming one of the 20 largest ETF issuers in the U.S. has been anything but boring ...