GSK (GSK) reported Q1 core earnings Wednesday of 0.45 UK pounds ($0.60) per diluted share, up from 0.43 pounds a year earlier.
Analyst estimates were not readily available for comparison.
Revenue for the quarter ended March 31 was 7.52 billion pounds, up from 7.36 billion pounds a year earlier.
Analysts surveyed by FactSet expected 7.26 billion pounds.
Shares of the UK pharma firm were up more than 3% in recent premarket activity.