Fidelity Investments' brokerage arm added $52.1 billion of assets in the fourth quarter, according to its earnings report Wednesday.

Fidelity Brokerage Co. said that assets under administration grew by 20%, to $1.13 trillion, and daily average commissionable trades increased 18%, to 223,210, from the year earlier.

Net new client assets in the fourth quarter, which include sales of both Fidelity and non-Fidelity mutual funds and individual securities, totaled $52.1 billion, compared with a net outflow of $6.3 billion in the fourth quarter of 2003.

In 2004, Fidelity reported that net new client assets grew by 126%, to $124.2 billion. Daily average commissionable trades last year increased by 46%, to 204,982.

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