Not exactly - After the Toronto-Dominion bank (aka TD) had previously bought Waterhouse Securities and formed TD Waterhouse, it was Ameritrade that bought the US part of TD Waterhouse from TD and rebranded itself as TD Ameritrade. TD continues to own 40% of TD Ameritrade. After Charles Schwab closes their majority acquisition of TD Ameritrade, TD will continue to own about 13% of the company. But TD has never been a majority shareholder of anything with the word Ameritrade in its name.

TD continues to be a major institution in its own right in both Canada and the US, and has engaged in plenty of other consolidation outside the scope of what's currently TD Ameritrade. Not disagreeing with the general point.