Star Equity Holdings, Inc. provides healthcare solutions in the United States and internationally. It operates through four segments: Diagnostic Services, Diagnostic Imaging, Construction, and Investments.

Standard BioTools Inc. creates, manufactures, and markets instruments, consumables, reagents, and software for researchers and clinical laboratories worldwide. It offers analytical systems, such as Helios, a CyTOF system, as well as Hyperion imaging systems, Hyperion tissue imagers, and flow conductors; and assays and reagents, including Maxpar reagents, Maxpar direct immune profiling assays, Maxpar on demand reagents, and IMC panel kits for immuno-oncology.

Biodesix, Inc. operates as a data-driven diagnostic solutions company in the United States. The company offers blood-based lung tests, including Nodify XL2 and Nodify CDT tests, together marketed as part of Nodify Lung Nodule Risk Assessment testing strategy, to assess the risk of lung cancer and help in identifying the appropriate treatment pathway and help physicians in reclassifying risk of malignancy in patients with suspicious lung nodules.

ENDRA Life Sciences Inc. develops technology for improving the capabilities of clinical diagnostic ultrasound. The company develops thermo-acoustic enhanced ultrasound technology that transmits sound waves, which bounce off tissues, organs, and blood in the body for use in the treatment of nonalcoholic fatty liver disease, as well as in temperature monitoring of thermoablative surgery, vascular imaging, and tissue perfusion.

Sera Prognostics, Inc., a women's health diagnostic company, discovers, develops, and commercializes biomarker tests for improving pregnancy outcomes. The company develops PreTRM test, a blood-based biomarker test to predict the risk of spontaneous preterm birth in asymptomatic singleton pregnancies.

FONAR Corporation, together with its subsidiaries, engages in the research, development, production, and marketing of magnetic resonance imaging (MRI) scanners for the detection and diagnosis of human diseases in the United States.

Neuronetics, Inc., a commercial stage medical technology company, designs, develops, and markets products for patients with neurohealth disorders in the United States and internationally.

Exagen Inc. develops and commercializes various testing products based on its cell-bound complement activation products technology under the AVISE brand in the United States.

Sotera Health Company provides sterilization, and lab testing and advisory services in the United States, Canada, Europe, and internationally. The company's sterilization services include gamma and electron beam irradiation, and EO processing; Nelson Labs comprise microbiological and analytical chemistry testing; and advisory services for medical device and biopharmaceutical industries.

Aclaris Therapeutics, Inc. operates a clinical-stage biopharmaceutical company, develops novel drug candidates for immune-inflammatory diseases in the United States. It operates through two segments: Therapeutics and Contract Research.

Castle Biosciences, Inc., a commercial-stage diagnostics company, focuses to provide diagnostic and prognostic testing services for dermatological cancers. Its lead product is DecisionDx-Melanoma, a multi-gene expression profile (GEP) test to identify the risk of metastasis for patients diagnosed with invasive cutaneous melanoma.

Prenetics Global Limited, an investment holding company, operates as a diagnostics and genetic testing company. Its products include CircleDNA, a consumer genetic testing product; and Circle HealthPod, a rapid detection health monitoring system that allows users to take COVID-19 tests at point-of-care or at home utilizing the nucleic acid amplification test.

MDxHealth SA, a commercial-stage precision diagnostics company, provides urologic solutions in the United States, the Netherlands, Belgium, Spain, Poland, Italy, rest of European Union, and internationally.

Inotiv, Inc. provides drug discovery and development services to the pharmaceutical, chemical, and medical device industries; and sells analytical instruments to the pharmaceutical development and contract research industries.