KEY POINTS
  • Online broker Robinhood said that it put temporary buying restrictions on a small number of securities because central Wall Street clearinghouse-mandated deposit requirements for equities increased tenfold.
  • "It was not because we wanted to stop people from buying these stocks," Robinhood said in a blog post published late Friday.
  • Amateur investors using Robinhood and other apps bid up heavily shorted stocks and caused GameStop shares to skyrocket 400% in the past week.
The Robinhood application on a smartphone.

Online broker Robinhood said that it put temporary buying restrictions on a small number of securities because central Wall Street clearinghouse-mandated deposit requirements for equities increased tenfold.

The decision by Robinhood, a free-trading pioneer and app that's popular among small investors, drew scrutiny from its customers over the past week.