Banks are known more for managing bond and money market mutual funds than for high-flying technology funds. Yet a fund managed by Chicago's Northern Trust Co. ranks among the top-performing technology portfolios in the country.

The bank's Northern Technology Fund had a 20.45% return for the three months ended Oct. 31, according to a study by CDA-Wiesenberger, Rockville, Md. The average technology fund returned 11% during these three months, CDA said.

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