The Webull Financial LLC website on a laptop computer arranged in Dobbs Ferry, New York, U.S., on Saturday, Jan. 30, 2021. The backlash over trading restrictions imposed by Robinhood Markets may be driving customers to one of the brokerage’s fastest-growing rivals, Webull Financial. Photographer: Tiffany Hagler-Geard/Bloomberg Online retail brokerage Webull Corp. is starting to offer corporate-bond trading for US customers. Investors will be able to buy and sell both investment-grade and high-yield bonds ...