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American Shared Hospital Services provides radiosurgery and radiation therapy equipment to health care providers. The company offers radiosurgery equipment for the Gamma Knife stereotactic radiosurgery, a non-invasive procedure to treat malignant and benign brain tumors, and arteriovenous malformations, as well as for trigeminal neuralgia. It also provides financing services for Leksell Gamma Knife units. In addition, the company offers proton beam radiation therapy services in Orlando, Florida and Long Beach, California, as well as offers planning, installation, reimbursement, and marketing support services to its customers. American Shared Hospital Services was founded in 1980 and is based in San Francisco, California.

DermTech, Inc., a molecular diagnostic company, engages in the development and marketing of novel non-invasive genomics tests to aid in the diagnosis and management of melanoma in the United States. The company provides DermTech Melanoma Test (DMT), an innovative non-invasive way to enhance melanoma detection for developing product for non-melanoma skin cancers. It also offers DermTech Smart Sticker, which provides a non-invasively way to collect skin sample including standard care by using scalpel to biopsy suspicious lesions. In addition, it provides research services and technology platform on a contract basis to pharmaceutical companies which use the technology for clinical trials. Further, the company develops gene expression assays for the psoriasis, atopic dermatitis, and aging of the skin to pharmaceutical companies to develop drug products in dermatology; and develop custom gene assays to support the pharmaceutical partners. It sells its products through pathology and oncology practitioners. DermTech, Inc. is headquartered in San Diego, California.

Psychemedics Corporation provides testing services for the detection of drugs of abuse through the analysis of hair samples in the United States and internationally. The company offers screening and confirmation by mass spectrometry using industry-accepted practices for cocaine, marijuana, and PCP; amphetamines, including ecstasy, eve, and Adderall; opiates, such as heroin, hydrocodone, hydromorphone, oxycodone, oxymorphone, and codeine; synthetic cannabinoids comprising K2, Spice, and Blaze; benzodiazepines consisting of Xanax, Valium, and Ativan; and nicotine, Fentanyl, and alcohol. Its testing results provide quantitative information that could indicate the approximate amount of drug ingested, as well as historical data that could show a pattern of individual drug use over a longer period-of-time. The company offers its services to employers for applicant and employee testing; and treatment professionals, law enforcement agencies, school administrators, and parents concerned about their children's drug use. Psychemedics Corporation was incorporated in 1986 and is headquartered in Dallas, Texas.

Exagen Inc. develops and commercializes various testing products under the AVISE brand in the United States. The company enables healthcare providers to care for patients through the diagnosis, prognosis, and monitoring of autoimmune and autoimmune-related diseases, including systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA). Its lead testing product is AVISE CTD that enables differential diagnosis for patients presenting with symptoms indicative of various connective tissue diseases (CTDs) and other related diseases with overlapping symptoms. The company offers AVISE Lupus that measures activation of the complement system by quantifying the level of B-cell C4d and erythrocyte bound C4d in the patient's blood; and AVISE APS, which consists of a panel of autoantibody tests that aids in the diagnosis and management of APS. In addition, it provides AVISE Vasculitis AAV, which utilizes a testing panel of individual analytes to provide physicians with results in the assessment and monitoring of anti-neutrophil cytoplasmic antibody associated vasculitis; AVISE SLE Prognostic, a panel of autoantibodies for assessing the potential for complications affecting the kidney, brain, and cardiovascular system; and AVISE Anti-CarP test, which identifies RA patients with severe disease. Further, the company offers AVISE SLE Monitor, a biomarker blood test; AVISE MTX, a patented and validated blood test; and AVISE HCQ, a blood test to monitor levels of hydroxychloroquine. It has a research collaboration and license agreement with Allegheny Health Network (AHN) Research Institute to develop novel patented biomarkers. The company was formerly known as Exagen Diagnostics, Inc. and changed its name to Exagen Inc. in January 2019. Exagen Inc. was incorporated in 2002 and is headquartered in Vista, California.