The SEC has been raising red flags that investors aren't being fully informed of their potential risks.
The examination is in its early stages and is being led by the agency's asset-management group.
Gary Gensler and Rohit Chopra will likely win confirmation to head the SEC and Consumer Financial Protection Bureau, respectively.
Many lawmakers seemed to not understand markets, investing or the technology behind the platforms.
His biggest holding, of between $25 million and $50 million, was in the Vanguard Total Stock Market ETF.
Regulators are scrapping a Trump-era policy that critics say helped insulate firms from tougher penalties.
The regulator is on the hunt for misinformation meant to improperly tilt the market.
The regulator will seek remedies following the recent trading frenzy involving GameStop and other securities.
The tumult has shaken the finance industry and prompted demands from Congress for the SEC to take action.
The rule-cutting and lax enforcement of the Trump years appear to be over.