Callan JMB is a small, specialized cold chain logistics company serving the life sciences industry. The company transports temperature-sensitive biological materials — including cell therapies, stem cells, vaccines, organs, embryos, and biopharmaceuticals — that require cryogenic or frozen conditions (as low as -150°C) throughout transit. Callan JMB bundles its services into a single integrated offering: proprietary reusable packaging that maintains cryogenic temperatures for two to ten days without external power, emergency logistics with domestic U.S. deployment in 12 hours or less, real-time Sentry temperature and location monitoring, and Ship2Q inventory management software for regulated products. The company uses a leasing model for its reusable packaging, positioning it as cheaper and more sustainable than single-use dry ice or liquid nitrogen alternatives. Revenue is driven by shipment volumes from a small number of large, recurring life sciences customers — the top customer alone represents 58% of revenue, and the top three account for roughly 79%. Callan JMB is headquartered in Spring Branch, Texas, has about 20 employees, and has operated for over 17 years. The company is looking to expand into adjacent markets, including GLP-1 drug transport, compounding pharmacies, and specialty food packaging, using the same core cold chain and monitoring infrastructure.