Robinhood has postponed the launch of its stock trading app in the UK indefinitely, as it refocuses efforts on strengthening core business in the US (Ryan Browne/CNBC)

Ryan Browne / CNBC:
Robinhood has postponed the launch of its stock trading app in the UK indefinitely, as it refocuses efforts on strengthening core business in the US  —  - Robinhood has told U.K. customers that it will refocus its efforts on strengthening core business in the U.S.