First Street

First Street builds physics-based, peer-reviewed climate risk models covering flood, wildfire, heat, wind, and air quality for every property in the United States, translating projected physical impacts into financial loss estimates. Its data is delivered through the Climate Risk API for point-level risk, the Enterprise API for portfolio-level aggregation, and a Raster Map API for visual peril layers, alongside the consumer-facing Risk Factor tool at riskfactor.com. The data is used across real estate, banking, and insurance, and powers property-level climate risk scores on listing portals including Zillow and Homes.com. First Street is now part of MSCI and has expanded its coverage beyond real estate to companies and infrastructure assets.