Tex is correct. I found NO brokerages named as defendants on the list of 1272. The name "Ameritrade" did appear on the list but only as an identification of where an account was held, i.e. Ameritrade IRA account. It looks like ONLY individuals are being sued, NOT brokerages!
Everthing I state is my own opinion (IMO). Do not make any trading decisions based on anything I state.