William Galvin, Massachusetts' top securities regulator, is probing six broker-dealers about whether they intend to increase the rate of interest on their sweep accounts given the recent interest rate hike.
The letters were sent to TD Ameritrade, Merrill Lynch, LPL Financial, Ameriprise and Securities America.
The Federal Reserve announced Wednesday that interest rates will be raised 0.25% with additional increases expected later this year.
Inflation is also putting strain on consumers, he says.