TD Ameritrade Holding Corp.'s top executive said Tuesday that the company's trading activity has improved this month as investors "reengaged in the market."

During a results conference call with analysts, Fred Tomczyk, the Omaha brokerage company's chief executive officer, said TD Ameritrade attracted $9 billion in net new assets in its fiscal first quarter, which ended Dec. 31, as both retail investors and registered investment advisers increased their investments.

The breakaway broker market has been "very active," he said, and TD Ameritrade is having success with its AdvisorLink program, which it began last year to help advisers looking to buy, sell or merge their practices.

Tomczyk said trading grew by about 60,000 trades per day, to 408,000 in January, from December.

TD Ameritrade said net income fell 26%, to $136.2 million, from a year earlier because of higher expenses and low interest rates. Operating margins fell to 38.5%, from 51.8%, because of higher acquisition costs and marketing spending.

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