Ralph McGinnis, Valgerdur Steinthorsdottir, Linda Morgan and colleagues perform a genome-wide association study in the offspring of preeclampsia pregnancies and identify variants in the fetal genome near FLT1 that are associated with risk of preeclampsia. FLT1 is known to encode an isoform of placental origin implicated in the pathology of preeclampsia, providing biological support for the association of this locus with preeclampsia risk.