The Company's catastrophe reinsurance programs are designed primarily by utilizing third-party catastrophe modeling software and consulting with third-party reinsurance experts to project the Company's exposure to catastrophe events. The Company evaluates modeled expected losses developed by the catastrophe modeling software using its risk portfolio data to estimate probable maximum losses ("PML") across multiple return periods and the average annual loss. The Company monitors and manages its catastrophe risk using this model output along with other internal and external data sources, such as its historical loss experience and industry loss experience, to develop its view of catastrophe risk.

The Company's catastrophe reinsurance coverage consists of three separate placements:

This reinsurance protection is an essential part of our catastrophe risk management strategy. It is intended to provide our stockholders with an acceptable return on the risks assumed by our insurance entity, and to reduce the variability of earnings, while providing surplus protection. Although reinsurance agreements contractually obligate our reinsurers to reimburse us for the agreed-upon portion of our gross paid losses, they do not discharge our primary liability. In the event one or more of our reinsurers fail to fulfill their obligation, the surplus of our statutory entity may decline, and we may not be able to fulfill our obligation to policyholders, or we may not be able to maintain compliance with various regulatory financial requirements. Additionally, we face the risk that actual losses incurred from one or more catastrophic events may be above the modeled expected loss resulting in losses exceeding our reinsurance coverage, which may result in a decline in surplus, and as a result we may not be able to fulfill our obligations to policyholders, or we may not be able to maintain compliance with various regulatory financial requirements. The details of our programs and the likelihood of a catastrophic event exceeding these three coverages are outlined below.

AmCoastal’s core catastrophe reinsurance program provides occurrence-based coverage up to an exhaustion point of approximately $1,680,000,000 for a first occurrence and $1,918,000,000 in the aggregate. Under this program, the Company's GAAP retention on a first event is $49,000,000 ($26,500,000 retained by AmCoastal under statutory accounting principles (STAT retained), $22,500,000 retained separately by the Company's captive)). The Company has purchased second and third event retrocession coverage, decreasing its second event GAAP retention to $25,000,000 ($13,300,000 STAT retained by AmCoastal, $11,700,000 retained separately by the Company's captive) and third event GAAP retention to $2,000,000, based on three $100,000,000 loss events. AmCoastal’s program provides sufficient coverage for approximately a 1-in-286-year return period, indicating that the probability of a single occurrence exceeding protection purchased is roughly 0.4% when using the catastrophe model AIR 13 (using the long-term catalog with demand surge and 10% loss adjustment expense included) and based on estimated total insured value at September 30, 2026 of $78 billion. AmCoastal’s program also provides sufficient coverage for a 1-in-100-year event followed by a 1-in-50-year event in the same treaty year, the probability of which is less than 0.1%. While we believe these catastrophe models are useful tools and their outputs provide reasonable proxies for the probability of exhausting our reinsurance protections, they are imperfect, and actual results may differ materially from those expected.

AmCoastal’s all other perils catastrophe excess of loss agreement provides protection from catastrophe loss events other than named windstorms and earthquakes up to $95,600,000 for a first event, totaling $170,400,000 in the aggregate. This agreement provides sufficient coverage for approximately a 1-in-227-year return period, indicating that the probability of a single occurrence exceeding protection purchased is no more than 0.5%.

In addition to the programs described above, AmCoastal renewed its catastrophe aggregate excess of loss coverage (the “CAT Agg” agreement) to mitigate our catastrophe frequency risk. This agreement provides coverage for in-force, new and renewal business. Effective January 1, 2026, the CAT Agg agreement provides $40,000,000 of aggregate limit (with a $20,000,000 per occurrence cap) in excess of zero after the $40,000,000 annual aggregate deductible has been met. The CAT Agg agreement limits our losses from all catastrophe loss events, including named windstorms, severe convective storms and winter storm events for the full year ending December 31, 2026.

Where we think prudent, particularly where premium rates are high relative to the risk, we retain risk whereby AmCoastal purchases reinsurance from Shoreline Re, our captive reinsurance entity. Shoreline Re has historically participated on AmCoastal's all other perils catastrophe excess of loss agreement and AmCoastal's excess per risk agreement. In addition, Shoreline Re participates in a 45% quota share agreement with AmCoastal, which provides coverage for all catastrophe perils as well as attritional losses incurred.