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Investing Playbook

Robinhood defends its app to regulators

Robinhood Markets Inc. on Friday told Massachusetts regulators that it doesn't take advantage of inexperienced customers, capping a wild week during which the popular online brokerage drew fierce ire for doing just the opposite: standing in customers' way.

WallStreetBets founder reckons with legacy amid stock market frenzy

Jaime Rogozinski never imagined the Reddit community he created in 2012 would morph into a force so powerful that it would send GameStop Corp. shares into overdrive, nearly topple a hedge fund and leave professional money managers around the country staring at Twitter with their mouths agape.

Citadel shoots down Robinhood link

Billionaire Ken Griffin's hedge fund Citadel LLC and the market maker Citadel Securities say they had nothing to do with the app Robinhood suspending some trading in stocks that have recently experienced a surge in volatility.