Stand hits $1B valuation with physics-based wildfire insurance

A San Francisco insurtech startup is betting that the property insurance industry’s reliance on historical loss data and zip-code clustering has fundamentally mispriced climate risk. Stand, which uses aerospace-grade computational fluid dynamics to simulate how individual homes behave during disasters, announced Thursday it has raised a $70 million Series C funding round at a $1 billion valuation.

Saga Ventures led the financing, joined by Lowercarbon, Eclipse, Equal Ventures, Inspired Capital, Neotribe, and Jackson Square Ventures. The capital arrives as the U.S. home insurance market faces its most severe contraction in decades. Major carriers including State Farm and Allstate have paused or restricted new policies in California, while Florida has seen dozens of regional insurers collapse under hurricane losses since 2022. Stand says it now covers more than $10 billion in total insured property value across those two states, up from $1 billion a year ago, growing at roughly 15% per month.

The company’s core argument challenges the actuarial foundations of catastrophe insurance. Traditional models used by legacy carriers rely heavily on historical claims data, geographic proximity to past fires, and broad secondary modifiers such as roof age or window type. Stand instead constructs a three-dimensional digital twin of every insured property. Its proprietary software, called the Stand World Model, layers structural materials, surrounding vegetation, topography, wind direction, and weather conditions into a physics simulation to calculate how a specific house would interact with an advancing wildfire or tropical cyclone.

This approach shifts underwriting from a static location score to a dynamic structural assessment. Chief Science Officer Matt DiStefano demonstrated the platform by manipulating a 3D model of a California neighborhood, showing how deleting a single tree adjacent to a structure could reduce a homeowner’s annual premium by more than $1,100. Unlike conventional risk scores that penalize homeowners for their neighbors’ vulnerabilities or unchangeable geography, Stand’s model allows policyholders to alter their risk profile through targeted mitigation.

To validate the technology, the company ran blind forward-looking simulations against actual outcomes for approximately 310 California homes affected by wildfires over the past four years, including properties in the path of the Palisades Fire. Stand reported its model correctly predicted whether a home would burn or survive 85% of the time, compared to what it characterized as a 50% to 55% accuracy rate for incumbent location-based models evaluated against the same cohort. These figures were generated internally and have not been independently verified by third-party actuaries.

DiStefano, 29, previously built orbital simulation models for satellites and circuit boards at companies ranging from Boeing to Y Combinator-backed startups. He noted that some homes initially rated by the model with a 99.8% probability of destruction saw that figure drop to near 15% after implementing specific structural changes recommended by the software.

The business model extends beyond underwriting into active property modification. CEO Dan Preston, who previously led pay-per-mile auto insurer Metromile, said Stand employs former construction professionals to help homeowners redesign their properties based on simulation outputs. The company distributes its policies entirely through independent brokers, providing near-instant quotes to replace the manual PDF-based workflows still common in specialty insurance. Chief Product Officer Jason Mueller, formerly of Policygenius, said the product and engineering teams total about 20 people, leveraging modern AI tooling to maintain output that would typically require significantly larger headcounts.

Stand’s policies are currently underwritten by Concert Specialty Insurance Company, which holds an AM Best A- rating, in California, and by Stand Insurance Exchange, carrying a Demotech A rating, in Florida. The company’s reinsurance panel includes Arch, RenaissanceRe, Hannover, Nephila, and Hiscox—established players whose participation signals reinsurer confidence in the underlying physics models despite the departure from traditional actuarial methods.

The broader industry is slowly moving toward granular risk assessment, driven by high-resolution satellite imagery and LiDAR scanning, but few firms have integrated real-time computational fluid dynamics directly into consumer-facing pricing. Legacy carriers often apply post-disaster rate increases uniformly across regions because their models cannot isolate which specific properties survived due to structural resilience versus sheer luck. This inability to differentiate drives mass non-renewals, leaving homeowners who have invested tens of thousands of dollars in fire hardening without coverage.

Stand plans to use the new capital to expand beyond California and Florida into western states prone to wildfires and southeastern markets exposed to hurricanes. Longer-term targets include regions vulnerable to severe convective storms, freezes, and flooding. Future product developments under consideration include financing mitigation work over the life of a policy, allowing real estate firms to pre-underwrite housing inventory, and enabling insurance policies to transfer seamlessly between buyers during home sales.

To manage this expansion, Stand hired Drew Saad, the former chief underwriting officer at PURE Insurance, as president of property and casualty. Tony Landi, previously head of strategic growth at Nephila and head of capital markets at Openly, joined as chief financial officer.