One of his priorities is to prevent tech platforms from acquiring technologies that threaten their dominance.
Schwab's purchase of rival TD Ameritrade in a $26 billion deal further consolidates the brokerage industry.
The Big Three fund managers have an increasingly important voice inside the companies whose shares they own.
U.S. antitrust officials have begun asking companies about communications with their biggest shareholders.
The accord will also require Facebook to keep a tighter leash on third-party apps.
Equifax will compensate consumers and provide credit monitoring to those whose information was exposed.
Democratic 2020 presidential hopefuls assailed tech giants' power and pledged stricter antitrust enforcement.
The goal would be to clamp down on acquisitions of sensitive technology.
Joseph Simons would take over an agency that is investigating the massive data breach at Equifax.
In addition to the Obama administration, the AMA is opposed to the merger, claiming it will reduce choice for consumers.