Kingstone Companies, Inc. has entered a partnership with ZestyAI to deploy the company’s Z‑FIRE wildfire risk model as part of its planned entry into California’s homeowners market on an excess‑and‑surplus lines basis. The collaboration will enable Kingstone to evaluate individual properties for wildfire exposure using machine‑learning models that assess defensible space, building materials, topography, and vegetation, thereby enhancing the precision of its underwriting and rating processes in a region with high wildfire risk.
Z‑FIRE is an AI‑powered model that provides property‑level risk scores, distinguishing it from traditional hazard maps. The model’s granular assessment allows Kingstone to price and underwrite policies with greater accuracy, a capability that is especially valuable in California where wildfire risk drives volatility in the insurance market. Regulatory filings in California have already approved the use of Z‑FIRE for underwriting and rating, giving the partnership a clear path to market entry.
California’s homeowners insurance market is worth roughly $15 billion, but the state’s growing wildfire threat has forced many admitted insurers to scale back or exit. Kingstone’s strategy is to enter on an E&S basis, maintain a 30 % quota share, and target low‑to‑moderate wildfire risk properties. This disciplined, data‑driven approach is designed to capture new business while managing exposure in a constrained market that has seen many insurers withdraw.
Kingstone’s recent financial performance underscores the strategic fit of the partnership. In Q4 2025 the company reported a GAAP net combined ratio of 64‑66 % and operating net income per diluted share of $1.03‑$1.08, driven by strong underwriting profit and a durable platform. Earlier in 2025, Q1 results showed a net income of $3.88 million and basic EPS of $0.29. The partnership aligns with Kingstone’s five‑year growth plan to reach $500 million in written premium by year‑end 2029 and to diversify its geographic concentration beyond New York.
Management highlighted the partnership’s importance. Chief Actuary and Head of Product Management Sarah Chen said the California entry “reflects the same disciplined, data‑driven approach that has driven our results in New York.” CEO Meryl Golden noted that diversification “is imperative to reduce volatility in earnings and risk overall,” and that the California E&S market offers flexibility and capacity that are currently scarce in the admitted market.
The collaboration positions Kingstone to capture a share of California’s high‑value homeowners market while maintaining underwriting discipline. By leveraging Z‑FIRE’s advanced analytics, the company can better assess wildfire risk, price policies appropriately, and manage exposure, thereby supporting its broader expansion strategy into high‑catastrophe states.
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