SCOTT GALLOWAY: Robinhood may seem like a roaring success, but 5 red flags make its business model unstable
Robinhood went public on Thursday, the old-fashioned way via an IPO with underwriters after a roadshow. The IPO priced at $38 per share, yielding a valuation of $32 billion, and closed its first day of trading down 8.4%. The trading company’s debut is the…