KEY POINTS
  • Shares TD Ameritrade posted their single worst day on Wall Street since Feb. 28, 2017, falling 7.1 percent; E-Trade notched its steepest loss since March.
  • The move by J.P. Morgan aggravates a cold-blooded price war, with the globe's largest managers fighting for clients with low-cost options.
  • J.P. Morgan will launch its new service next week. All customers get 100 free stock or ETF trades in the first year. Those with Chase Private Client get unlimited trades.

Online brokerage firms including Charles Schwab, TD Ameritrade and E-Trade sank Tuesday after CNBC reported J.P. Morgan Chase will offer a new digital investment app with free trading.

Shares TD Ameritrade posted their single worst day on Wall Street since Feb. 28, 2017, falling 7.1 percent while E-Trade notched its steepest loss since March, falling 4.3 percent.