Glossary

Nuclear verdict

A jury verdict of $10 million or more against a business, far above what the economic losses would suggest, that pushes up liability and umbrella costs.

Also called: nuclear verdicts, thermonuclear verdict, runaway jury verdict

"Nuclear verdict" is a trade term for an outsized jury award, generally $10 million or more, against a company. "Thermonuclear" is reserved for $100 million and above. Marathon Strategies, which tracks them, counted 190 corporate verdicts of $10 million or more in 2025, up 40.7% from 135 in 2024, totaling more than $25.6 billion (Marathon Strategies, 2026 report).

For an insured, one verdict can exceed the primary limit, run through an umbrella and excess layers, and leave the business paying the rest. Trucking crashes, product defects and premises injuries are common sources of large cases. Insurers respond by raising umbrella policy and excess prices, shrinking the limit they put on any one layer, and tightening underwriting in auto and other litigation-prone classes. Verdicts also push settlement values up in cases that never reach a jury.

Causes are debated. The trade usually cites social inflation, third-party litigation funding, and plaintiff tactics that anchor jurors to large numbers, and some states have answered with tort reform of varying scope. Whatever the cause, the planning question is the same: how much limit sits above your primary policy, and does the structure hold if one claim is large. The guide on nuclear verdicts and social inflation covers the drivers, and the How much umbrella coverage do I need? helps size a limit.

Last reviewed October 10, 2026

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Related terms

Social inflation Growth in liability claim costs beyond general price inflation, driven by larger verdicts, litigation funding, advertising and shifting jury attitudes. Punitive damages Damages awarded to punish and deter malice, fraud or reckless conduct rather than to compensate; whether insurance may pay them depends on state law. Umbrella policy A liability policy that adds limits above underlying general liability, auto and employers' liability policies and may cover some claims they do not. Excess liability Liability coverage that pays only after the limits of underlying policies are used up, adding limit above them without necessarily broadening the terms. Defense costs The attorney fees, expert fees and other expenses of fighting a claim, which some policies pay on top of the limit and others deduct from it.

Related guides

Emerging risks insurers are watching in 2026 AI, systemic cyber, PFAS, litigation costs, secondary perils and heat are changing policy wording. What insurers are doing and what to ask your broker. Nuclear verdicts and social inflation: why liability costs keep rising Nuclear verdicts and social inflation push liability claim costs above ordinary inflation. The 2026 data, what drives them, and what business buyers can do. Telematics and dashcams in commercial auto insurance What fleet telematics and cameras record, how insurers use the data in pricing and claims, what research shows, and the privacy and evidence rules to plan for. Third-party litigation funding and liability insurance Outside investors now fund lawsuits for a share of the recovery. What that means for liability claims, settlement talks, disclosure rules and your limits. Tort reform and liability insurance: what changes for business buyers State tort reform changes fault rules, evidence and recovery. What Florida and Georgia changed, and what reform does and does not do to your premium. Trucking verdicts and the cost of auto liability Why truck crash verdicts run so large, what 2026 data show, how Werner v. Blake and Montgomery v. Caribe matter, and what it does to limits and rates.