Editor's Note: The ability of value investors to adhere to their investment strategy has been put to the greatest test ever. From January 2017 through March 2020, in terms of total returns, the Russell 3000 Growth Index outperformed the Russell 3000 Value Index by 51.7...

The Silicon Valley company has turned the complex process of trading stocks into a simple, free swipe across a screen. But some researchers say the app’s simplicity nudges inexperienced investors to take bigger risks. Read More WSJ.com: Markets...