BranchLab is a New York data science company that builds AI-driven advertising and audience activation software for healthcare and pharmaceutical marketing. Its platform, Pathwai, models patient, caregiver and healthcare-provider audiences using non-health demographic and behavioral signals rather than protected health information, so campaigns can be targeted without touching PHI. Advertisers can build and refine audiences, activate them across omnichannel media, and measure real-world outcomes such as prescriptions, diagnoses and healthcare visits. The company was founded in 2024 by Josh Walsh, Michael Parkes and Chris Cagle, and reports use by leading pharmaceutical brands.