September 20, 2021. Twitter agreed to pay $809.5 million to end a securities class action lawsuit that was brought against the company in the Northern District of California. Plaintiffs alleged that Twitter concealed declining user engagement and user growth. Professor Steven Feinstein of Babson College and Crowninshield Financial Research provided expert testimony and reports on market efficiency and loss causation and damages, and consulted on the plan of allocation.


Additional information is available at Reuters.