About TD Ameritrade Stock. TD AMERITRADE Holding Corporation, through its subsidiaries, provides securities brokerage services and technology-based Here's a four-step guide about how to buy Uber stock now that it is a public company. IPO: May 2019 at $45 share price. on TD Ameritrade's secure website. TD Waterhouse is the brand used for a Canadian brokerage within Toronto- Dominion Bank. bank to purchase seats on the Toronto, Montreal, Vancouver and Alberta stock exchanges. However, Ameritrade instead purchased TD Waterhouse USA, with TD Bank "TD Waterhouse IPO proves popular". www. cbc.ca.