Buoyed by internal growth and acquisitions, Fiserv Inc., a Brookfield, Wis., bank outsourcer, is enjoying healthy appreciation of its stock price and achieving landmark rises in revenues and customers.

The company, whose stock closed Friday at $39.25, down 6.25 cents for the week but up 20% for the year, posted higher banking revenues than Alltel Information Services Inc. for the first time last year. Thus Fiserv eased into a distant second place behind the financial industry behemoth Electronic Data Systems Corp. Fiserv's $974 million of revenue falls far short of EDS' $2.4 billion in banking, brokerage, and insurance but outranks Alltel's banking business by $1 million.

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