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.

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