Stream Bio

Stream Bio is a UK life science tools and diagnostics company developing and manufacturing Conjugated Polymer Nanoparticles (CPNs), fluorescent and magnetic bioimaging probes used across research, in vitro diagnostics, and therapeutic research. Its CPN platform spans visible and near-infrared wavelengths and is marketed as brighter, more stable, and less toxic than conventional probes such as quantum dots. The company sells reagent products and conjugation kits for applications including lateral flow assays, ELISA, western blotting, imaging, and biomarker detection. Stream Bio has also pursued point-of-care diagnostic collaborations, including programs in cardiac biomarkers and SARS-CoV-2 testing, and formed Brightline Diagnostics as a joint venture with Chelsea Technologies. Overall, the business appears to be a commercial-stage biotech tools company rather than a drug developer.