BlackRock’s $15.2 billion purchase of Barclays Global Investors from Barclays last year created the $3.3 trillion behemoth that tops the II300, Institutional Investor’s annual ranking of the 300 biggest U.S. money managers. With $1.9 trillion in assets, Boston-based State Street Global Advisors (SSgA) is the second-largest firm in the II300.
