Personalis, Inc. develops, markets, and sells advanced cancer genomic tests and services in the United States and internationally. Its services are used by pharmaceutical companies for translational research, biomarker discovery, the development of personalized cancer therapies, as well as tests are used by physicians to detect residual or recurrent cancer in patients, monitor cancer response to therapy, and uncover insights for therapy selection. The company offers NeXT Personal, a tumor-informed liquid biopsy test for detection of minimal residual disease (MRD), therapy response and recurrence monitoring, in solid tumor cancers; ImmunoID NeXT, a tissue-based service that combines whole exome and whole transcriptome sequencing data with advanced analytics to provide a multi-dimensional view of the tumor and the tumor microenvironment from a single sample. It also provides NeXT Personal Dx, a tumor-informed liquid biopsy test for the detection of MRD; NeXT Dx, a tumor profiling test that is used to help select therapy for a cancer patient and identify potential clinical trials for a patient. In addition, the company performs whole exome sequencing of cancer tissue and matched blood samples for diagnostic companies as an input to their products; and whole genome sequencing on human samples for research projects, such as population sequencing initiatives. Its customers include pharmaceutical companies, biopharmaceutical companies, diagnostics companies, universities, non-profits, government entities, and patients. Personalis, Inc. was incorporated in 2011 and is headquartered in Fremont, California.