Bitcoin and pot help fuel 'frenetic activity' in retail investing: TD Ameritrade CEO By: CNBC.com News January 23, 2018 at 18:41 PM EST TD Ameritrade's daily average trades were 726,000 in the fourth quarter, up 49 percent from a year earlier. Read More >> Related Stocks: Amtd Idea Group Bitcoin (Bitstamp) Bitcoin Composite