“The Registration Statement and Prospectus and certain of the Defendants’ other public statements, contained untrue statements of material fact or omitted to state material facts required to be stated therein or necessary to make the statements therein not misleading,” it reads. "AT&T was overinvesting in WarnerMedia entertainment content for streaming, without sufficient concern for return on investments … WarnerMedia had a business model to grow the number of subscribers to its streaming service without regard to cost or profitability.”