Swiss Re Integrates Fathom Flood Data and AI-Enhanced Climate Models into Its Catastrophe Model

Swiss Re is integrating Fathom's scientifically validated flood hazard and terrain data into its internal catastrophe model, strengthening its view of global flood risk, according to a January 13, 2026 announcement from Fathom. Swiss Re acquired Fathom in December 2023, and since then joint teams have worked to expand and align key Fathom datasets to support next-generation flood modeling. Current integration work includes building 50,000-year probabilistic flood event sets that use AI-enhanced climate models to capture more extreme outcomes and remove historical biases. The new models will also embed FathomDEM+, Fathom's advanced global terrain dataset, to improve accuracy across multiple geographies. Fathom's flood models are already active within the Swiss Re Risk Data Solutions product suite, and ongoing joint development is advancing the systematic incorporation of Fathom data across Swiss Re's underwriting and portfolio management activities, unlocking a range of risk assessment tools for both insurance and corporate clients. The announcement notes that nearly half of the world's landmass, home to an estimated four billion people, is currently exposed to flood-related hazards. "Combining Fathom's flood hazard capabilities with Swiss Re's catastrophe modelling and underwriting expertise enables us to push flood risk modelling further," said Balz Grollimund, Head of Cat Perils at Swiss Re.