1992
Natural Cat
Hurricane Andrew
Category 5 hurricane made landfall in south Florida on August 24, 1992. Devastated Homestead and South Dade County. At the time, the largest insured loss in history. Eleven US insurers became insolvent. Florida's homeowners market collapsed and was rebuilt around a state-backed reinsurer (Florida Hurricane Catastrophe Fund) and Citizens Property Insurance.
The lesson: Cat models built on historical experience underestimated tail risk. The post-Andrew era was the founding of modern catastrophe modeling — RMS, AIR (now Verisk), and EQECAT all emerged from the recognition that the industry needed better tail estimates than empirical history could provide.
2001
Man-made
September 11 attacks
Coordinated attacks destroyed the World Trade Center and damaged the Pentagon on September 11, 2001. Insured losses spanned property, business interruption, life, liability, workers compensation, and aviation. The largest insured loss event in history at the time, surpassing Hurricane Andrew. Reinsurance for terrorism evaporated. The federal Terrorism Risk Insurance Act (TRIA) was enacted in 2002 to bridge the capacity gap.
The lesson: Some perils are uninsurable without a federal backstop. The post-9/11 architecture — TRIA and its successors — established a template for public-private risk sharing on catastrophic terrorism risk that has been reauthorized through 2027.
2005
Natural Cat
Hurricane Katrina
Category 5 hurricane made landfall on the Gulf Coast on August 29, 2005, devastating New Orleans through levee failure and the broader Gulf Coast through wind and surge. The largest single-event insured loss in history at that time. Spawned years of "wind vs water" coverage litigation as insurers and the National Flood Insurance Program (NFIP) disputed cause-of-loss allocations.
The lesson: The boundary between covered wind damage and excluded flood damage is the hardest line to draw in catastrophe claims. Anti-concurrent causation language became standard in commercial property forms. The NFIP's structural underfunding became a national policy issue.
2008–09
Casualty
AIG collapse and the financial crisis
AIG's Financial Products division, which had written credit default swaps on subprime mortgage securities, required a $182B federal bailout to prevent disorderly liquidation in September 2008. The traditional insurance subsidiaries were solvent but were caught up in the structural collapse. The episode redefined how regulators and rating agencies view non-traditional insurance group activities.
The lesson: The biggest insurance company in the world could fail not from insurance losses but from non-insurance financial products written under the holding company umbrella. Post-crisis regulation (Dodd-Frank, NAIC ORSA, group supervision) was reshaped around this risk.
2010
Man-made
Deepwater Horizon
BP-operated drilling rig exploded in the Gulf of Mexico on April 20, 2010, killing 11 workers and causing the largest marine oil spill in history. Insurance losses across property (drilling rig hull), liability, workers compensation, and environmental coverages. BP's eventual total cost exceeded $65B. Energy package insurance markets retrenched.
The lesson: Offshore energy is a low-frequency, high-severity line where single events can exhaust whole towers. Post-Deepwater, deepwater drilling underwriting tightened significantly, and contractor liability allocation between operator and drilling contractor became a far more carefully negotiated provision.
2011
Natural Cat
Tōhoku earthquake & tsunami
Magnitude 9.0 earthquake off the coast of Japan on March 11, 2011, generated a massive tsunami that devastated coastal Japan and caused the Fukushima Daiichi nuclear meltdown. The most expensive natural disaster in history by total economic loss. Insured losses were largely absorbed by the Japanese government's reinsurance scheme and major global reinsurers.
The lesson: Global supply chains carry catastrophic correlation that traditional CBI underwriting did not contemplate. Auto manufacturers worldwide saw production interrupted by Japanese-source component shortages. The post-Tōhoku era saw a structural rethink of contingent BI exposure, supplier dependency analysis, and supply-chain-specific insurance products.
2011
Natural Cat
Thai floods
Catastrophic flooding across central Thailand from July to December 2011, peaking in October. Devastated industrial estates in the Ayutthaya and Bangkok regions, where much of the world's hard drive and auto component manufacturing was concentrated. The largest CBI loss in insurance history.
The lesson: Insurance for non-physical disruption to remote suppliers had been chronically under-reserved. Post-Thai flood, contingent business interruption coverage was reunderwritten across the global market with more rigorous supplier concentration analysis and far tighter sublimits.
$15B+
Insured (CBI driven)
2012
Natural Cat
Hurricane Sandy
Post-tropical cyclone made landfall in New Jersey on October 29, 2012. Storm surge devastated coastal New York and New Jersey. The most expensive natural disaster in the Northeast US in history. Triggered wind-vs-flood coverage disputes similar to Katrina but with a different demographic and asset profile (urban density, dense commercial real estate, mass transit).
The lesson: Storm surge is not coastal flooding alone — it can drive water far inland and into properties never considered flood-exposed. Post-Sandy, urban flood modeling became more sophisticated and many New York/New Jersey commercial properties added flood coverage that had previously been considered unnecessary.
2017
Cyber
NotPetya
Destructive cyberattack disguised as ransomware, attributed by Western governments to Russian state actors, spread from a compromised Ukrainian accounting software update in June 2017. Crippled Merck, Maersk, FedEx-TNT, Mondelez, and others. Total economic damage exceeded $10B. The attribution to a nation-state triggered the war exclusion in many cyber policies, leading to landmark coverage litigation.
The lesson: War exclusions in cyber policies were not drafted with state-sponsored attacks against private companies in mind. The Merck v. ACE litigation (settled in 2023 in Merck's favor) reshaped how the industry writes war and hostile-act exclusions in cyber policies. Lloyd's now requires explicit cyber-war language; many carriers exclude state-sponsored attacks affirmatively.
2017
Natural Cat
Harvey, Irma, Maria (HIM)
Three major hurricanes in a single Atlantic season. Harvey devastated Houston with unprecedented rainfall in August. Irma struck Florida in September. Maria destroyed Puerto Rico's electrical grid and infrastructure in late September. Combined insured losses approached $100B. The most damaging hurricane season since 2005.
The lesson: Annual cat aggregations can exceed any single-event tail estimate. Puerto Rico's experience also exposed the limits of insurance penetration in lower-income jurisdictions — much of the territorial damage was uninsured. The reinsurance market began shifting to multi-year aggregate covers and parametric structures.
2020
Casualty
COVID-19 pandemic
Global pandemic produced enormous business interruption losses (almost all denied), workers compensation presumption claims, event cancellation losses, D&O securities class actions, and liability exposures. Tens of thousands of business interruption lawsuits were filed; the vast majority resolved in carriers' favor on "direct physical loss" interpretation. Event cancellation and trade credit absorbed direct losses.
The lesson: Insurance is built around discrete physical-cause events. Correlated, non-physical, systemic losses do not fit the standard structure. The post-COVID consensus is that pandemic risk is uninsurable in private markets at meaningful scale; affirmative pandemic coverage exists but is narrow, expensive, and rarely purchased.
$50B+
Insured (mostly event cancellation)
2022
Natural Cat
Hurricane Ian
Category 5 hurricane made landfall in southwest Florida on September 28, 2022. The costliest hurricane in Florida history. Compounded an already strained Florida homeowners market that had been hemorrhaging carriers. Accelerated the broader 2023 reinsurance hardening that affected cat-exposed property globally.
The lesson: A single major event in a stressed market can tip the reinsurance cycle. The 1/1/2023 treaty renewal saw the hardest reinsurance pricing in twenty years, with Florida domestic carriers facing 50–100% rate increases and retention thresholds doubling.
2023
Natural Cat
Maui wildfires
Wildfires destroyed the historic town of Lahaina on August 8, 2023, killing 102 people. Hawaiian Electric was named in litigation as a likely cause through utility-grid failures during high-wind conditions. The most deadly US wildfire in over a century. Triggered massive utility liability exposure to add to the already-stressed California-driven utility wildfire exposure.
The lesson: Utility liability for wildfire is a casualty exposure with cat-loss severity. PG&E's prior bankruptcy from California wildfire liabilities and Hawaiian Electric's exposure from Maui combine to make utility wildfire liability one of the hardest specialty lines in the casualty market.
2023
Cyber
MOVEit data breach
The Cl0p ransomware group exploited a zero-day vulnerability in MOVEit, a widely-used file transfer tool, beginning in May 2023. Hundreds of organizations affected, including government agencies, financial institutions, healthcare providers, and educational institutions. One of the largest data breaches in history by number of affected organizations.
The lesson: Vendor and supply-chain cyber risk is the dominant aggregation concern in cyber insurance. A single software vulnerability can simultaneously trigger thousands of policies. The 2023 cyber market response was tighter sublimits on systemic events, more rigorous third-party software dependency underwriting, and explicit aggregation language in renewals.
2024
Natural Cat
Hurricanes Helene & Milton
Two consecutive major hurricanes struck the southeast US in September–October 2024. Helene caused catastrophic inland flooding from the Gulf Coast deep into the Appalachian region, devastating areas hundreds of miles from the coast. Milton made landfall in Florida two weeks later as a major hurricane. Combined insured losses approached $80B. Inland flooding from Helene was largely uninsured because flood penetration outside FEMA-mapped zones is minimal.
The lesson: "Secondary perils" — inland flooding, severe convective storms, wildfires — produce loss totals approaching or exceeding the major Atlantic hurricanes. The protection gap for inland flooding is enormous and growing. The post-2024 conversation centers on parametric structures, public-private partnerships, and the long-term insurability of inland flood exposure.