The shares closed 6.2% higher at $102.30.
Net income was 56 cents a share compared with 60 cents in the year-earlier period. The reported second-quarter earnings included 10 cents a share of costs from Fiserv's pending acquisition of First Data (FDC) - Get Report .
Adjusted profit was 82 cents against 75 cents. Revenue advanced 6.5% to $1.51 billion.
A survey of analysts by FactSet produced consensus estimates of 81 cents a share of profit on $1.51 billion.
Fiserv disclosed the $22 billion all-stock deal for First Data in January and expects to close it July 29.
For the full year, Fiserv expects adjusted earnings of $3.39 to $3.52 a share. FactSet's survey is looking for $3.86.
Fiserv, Brookfield, Wis., provides payment, payment-processing, compliance-assurance, anti-fraud and other technologies to banks and financial-services companies.