REVIEW Unicorns may be mythical beasts, but multibillion-dollar start-ups are alive and well and running wild on Wall Street. Design software firm Figma is the latest company to make a splashy debut.

13D FILINGS These disclosures are from 13Ds filed with the Securities and Exchange Commission. 13Ds are filed within 10 days of an entity’s attaining more than 5% in any class of a company’s securitie ...