Nati Harnik, AP
FILE - In this Fe. 16, 2011 file photo, TD Ameritrade's President and CEO Fred Tomczyk, discusses with shareholders the online brokerage's performance at the company's annual meeting in Omaha, Neb. TD Ameritrade said Tuesday, Jan. 17, 2012, its fiscal first-quarter net income grew 5 percent despite last fall’s economic concerns, but the online brokerage’s revenue slipped as trading activity slowed. (AP Photo/Nati Harnik, File)

OMAHA, Neb. — TD Ameritrade said Tuesday that its fiscal first-quarter net income grew 5 percent and its revenue was almost unchanged as the online brokerage's trading activity slowed amid worries about the economy.

The Omaha-based company posted $152 million in net income, or about 27 cents per share, in the October-December quarter. That's up from $145 million, or 25 cents per share, in the same quarter in 2010, and topped the 26 cents per share profit that analysts surveyed by FactSet were expecting.

But revenue fell less than 1 percent to $653.4 million from $656.2 million. Analysts expected revenue to grow to $671.5 million.

One of the key drivers of Ameritrade's revenue is the fees it charges for transactions it handles, but trading slipped during the last three months of 2011 due to growing worries about the European debt crisis. The average number of trades per day dipped to 367,479 from 371,916 in the same period a year earlier. In the July-September quarter, there was an average of 415,739 trades per day.

"While volumes have improved over December, clients continue to hesitate in their trading and investing in the face of all of the uncertainty in the markets right now," said Fred Tomczyk, Ameritrade's president and CEO. He said that while there are signs the U.S. economy is improving, it will be a slow recovery, and there remains a "cloud of uncertainty" for Europe.

Ameritrade also makes money from fees based on clients' assets, but the current low interest rates are limiting what TD Ameritrade earns on its clients' deposit accounts and other investment products.

Ameritrade said its net new assets grew 11 percent to $10.2 billion from $9.7 billion. The total client assets Ameritrade holds grew 7 percent to $406.3 billion at the end of the quarter from $386.4 billion.

Ameritrade said it spent about $107 million during the quarter to repurchase 6.7 million shares of its own stock, and plans to pay a dividend of 6 cents per share in February.

TD Ameritrade Holding Corp.