We developed a method to detect copy number variation and loss of heterozygosity in genome-edited cell lines by only sequencing the edited site. We introduced different substitutions on both chromosomes of diploid H9 human embryonic stem cells using CRISPR/Cas9 and a mixture of homology-directed repair donor DNAs carrying different substitutions. Here, we deposit the associated sequencing data (BAM-files) generated by extracting genomic DNA from genome-edited H9 cells, PCR amplifying the region of interest and sequencing on a MiSeq platform. We sequenced the edited site of cell bulks to investigate the editing efficiencies of individual donors from the donor mixtures. For proof of concept, we isolated over 850 cellular clones from the edited cell bulks and sequenced the edited site and heterozygous positions flanking the edited site to determine the number of alleles at the edited site and detect copy-neutral loss of heterozygosity. Additionally, we sequenced the DNA donors to assess, the distribution of individual donors in the mixtures.