Client assets at TD AMERITRADE (NASDAQ:AMTD) have exceeded $500 billion for the first time in the company's history.  In its latest set of monthly metrics, the company revealed that the figure came in at $502.5 billion as of Feb. 28. This was a 14% increase over the same month the previous year, and 1% higher than January's number.

TD AMERTRADE quoted CEO Fred Tomczyk as saying that this happened chiefly because the company "implemented a new sales and service model, delivered new products and invested in marketing and technology to improve the investing experience for our clients."