Galapagos (GLPG) reported a Q1 loss late Wednesday of 2.3 euros ($2.62) per diluted share, swinging from a profit of 1.4 euros a year earlier.
Total net revenue for the quarter ended March 31 was 75 million euros compared with 62.4 million euros a year earlier.
Analysts surveyed by FactSet expected 63.4 million euros.