daily average client trades rose 15% in January from a year earlier, to 266,000.
In January, TD Ameritrade opened 44,000 client accounts and closed another 14,000 accounts, resulting in 6.3 million total accounts.
The Omaha, Neb., company reported average client margin balances of $7.5 billion last month. TD Ameritrade has total client assets of $281 billion.
The brokerage purchased Toronto-Dominion Bank's retail brokerage, TD Waterhouse, in January 2006.
TD Ameritrade also revealed in a regulatory filing that it had paid $150,000 in December to settle an investigation by the NASD into the transfer of client cash balances held at its broker-dealer subsidiary to deposit accounts held at banks.
Shares closed down 24 cents to $17.65 on Thursday.