FM, the commercial property insurer based in Johnston, Rhode Island, said on August 10, 2026 that it had acquired FortressFire, a wildfire intelligence company in San Mateo, California. FM did not disclose the financial terms.
FortressFire will operate as an independent, wholly owned division of FM and will keep serving customers under its own brand and with its existing leadership, led by founder, chairman and chief executive Michael Ashker.
FM said it would combine FortressFire's wildfire modelling with its own engineering, research and property risk management work.
What FortressFire built
FortressFire's focus is a narrow question: whether a particular structure is likely to ignite when a wildfire comes near, and what can be done to stop it. The company combines machine learning with physics-based modelling, drawing on fire behaviour models, thermodynamics and analysis of the fuel around and on a building.
Its services run on a platform called AMP, short for Assess, Mitigate, Monitor, Protect. They include aerial wildfire reports, monitoring, analytics, ground inspections and mitigation assessments, which together give structure-level findings and recommendations. Its customers include insurers, reinsurers, brokers, real estate professionals, lenders and property owners.
Its best-known product is the Aerial Risk Report, which estimates a property's vulnerability to ignition without a site visit. Each report combines AI analysis of aerial imagery with physics-based fire simulations that account for vegetation, topography and building materials, and gives an ignition vulnerability score, a breakdown of the factors behind it and recommended mitigation steps, Fire & Safety Journal Americas reported.
In December 2025 the company made the reports available in 12 western states: Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Texas, Utah, Washington and Wyoming. At that point it said it had analysed more than 100,000 structures, and that it was working with brokers, underwriters and asset managers on insurance programmes that reward property owners who carry out mitigation work.
The company's team includes wildfire scientists, insurance professionals, technologists and fire mitigation specialists, according to the announcement. Coverager put the headcount at 17 people, based on LinkedIn.
“The FortressFire team brings powerful tools to assess and mitigate wildfire risk, and we are excited to welcome them to the FM family.”
Why FM is buying
FM is a mutual insurer founded nearly two centuries ago whose policyholder-owners include one in four Fortune 500 companies.
Runtime Wire described FM as one of the largest commercial property insurers, with a surplus of $31 billion, and said FortressFire's ignition modelling and mitigation workflows would be paired with FM's engineering operation. Ashker himself described FM as an engineering-focused insurer.
Chairman and chief executive Malcolm Roberts said FortressFire shared FM's belief in data-driven, location-based risk mitigation and protection, and that its tools would help clients understand and manage wildfire exposure.
Ashker said FortressFire had long argued that the best risk management is preventing ignition and that the path to insurability runs through science. He described the backing of an engineering-focused insurer as the strongest possible validation of the company's work.
The founder and the funding
FortressFire was founded in 2020, according to Coverager. Ashker founded the company and serves as its chairman and chief executive, and he stays in charge under FM ownership.
Funding details are unclear. Coverager reported that FortressFire had raised about $69,000 according to LinkedIn, while a separate Coverager headline reported that the company had raised $375,000 toward a $1.5 million goal. Neither figure was confirmed by FM, and no investors were named.
What happens to customers
Because FortressFire remains a separate division with its own brand and leadership, FM said it would continue serving its customers, which include insurers, reinsurers, brokers, lenders and property owners. Its modelling will also be combined with FM's own engineering and research work on property risk.
A crowded field for wildfire risk data
Wildfire risk has grown in many parts of the world in recent years, Reinsurance News noted in its report on the deal, and insurers have been looking for ways to price and reduce it at the level of individual properties rather than whole regions.
Runtime Wire pointed to other wildfire models used in the market, including the California Department of Insurance's public wildfire model and ZestyAI's Z-FIRE, and said the FM deal showed a path to exit for insurtech companies that link risk data to underwriting and loss prevention.
