This is the inaugural dataset for the new GRIP-seq method to map cis-regulatory regions genome-wide. This dataset is for the purple sea urchin embryo, S. purpuratus, at 24 hours post fertilization. There are two experimental samples using an anti-Pol(II) antibody to pull down regulatory region-promoter complexes and one control using IgG alone. Full details of the GRIP-seq methodology are available in the linked manuscript. Bam index (bai) files and tiled data (tdf) files are also available at http://www.ebi.ac.uk/arrayexpress/experiments/E-MTAB-3607/files/