When a magnitude 7.1 earthquake struck Kumamoto Prefecture on July 28, the industry’s attention moved quickly to the Taiwan Semiconductor Manufacturing Co (TSMC) and the question of whether chip supply would be disrupted. That was the wrong question. The more consequential one for insurance brokers is whether their clients’ contingent business interruption (CBI) policies will actually respond – and, based on how most CBI wordings are structured, the answer for many may be no.
Verisk’s Catastrophe and Risk Solutions group placed insured property losses from the event at between JPY 220 billion (approximately US$1.4 billion) and JPY 340 billion (approximately US$2.1 billion), according to a release published August 2. The estimate covers ground shaking and liquefaction damage and is stated before recoveries under Japan’s earthquake insurance program. Business interruption losses are excluded entirely from that figure.
The TSMC-led Japan Advanced Semiconductor Manufacturing (JASM) fab confirmed structural safety and began gradually restoring operations within hours of the quake. TSMC confirmed all personnel were safe after evacuation and that structural inspections had confirmed the buildings were sound, with operations gradually resuming, according to Reuters.
The more commercially significant disruption came from a facility whose name rarely appears in insurance coverage reviews. Tokyo Electron Kyushu confirmed no major damage to buildings or facilities at either its Koshi or Ozu plants in Kumamoto Prefecture but suspended operations at both the following day to conduct safety inspections. According to Tokyo Electron’s April 2026 earnings call, the company’s coater/developer market share stood at 91% for CY2025. Coater/developer systems are the equipment that applies and develops photoresist on semiconductor wafers – a step present in the manufacture of every chip made anywhere in the world. That market share is further confirmed in the company’s Integrated Report 2025, available on its investor relations website.
Semiconductor equipment manufacturer Tokyo Electron paused operations at its Koshi and Ozu plants on July 29 to complete safety inspections, despite reporting no major damage to buildings or manufacturing equipment. For a client in Vietnam assembling electronics, a South Korean automotive supplier, or a European camera manufacturer, the risk is not the JASM’s walls. It is whether Tokyo Electron Kyushu can deliver equipment or service engineers when the next scheduled maintenance window arrives.
Contingent business interruption insurance policies protect against losses from supply chain disruptions but may require the occurrence of physical property damage to trigger coverage, according to the US National Association of Insurance Commissioners (NAIC). This coverage is typically triggered by physical damage at the dependent property, even if the policyholder’s own premises remain unharmed.
The Tokyo Electron Kyushu facilities reported no confirmed structural damage. If that holds, a CBI policy requiring physical damage at a named supplier may not respond – even if production delays cascade for weeks. CBI coverage also requires policyholders to identify and, in many cases, schedule dependent locations. A client that holds CBI cover but has not named Tokyo Electron Kyushu as a dependent location has no cover at all, regardless of actual loss.
Brokers advising manufacturing, technology, or automotive clients should be asking three questions now: Is Tokyo Electron Kyushu named in the policy? What is the physical damage trigger wording? And does the indemnity period reflect a realistic recovery timeline? The 2016 Kumamoto precedent showed that equipment assembly recovered in approximately 10 days, while Sony’s front-end fab took approximately three months. CBI indemnity periods calibrated to standard property losses were not designed around those timelines.
The Verisk figure is a gross number. Under Japan’s residential earthquake insurance structure, private insurers cede 100% of residential earthquake insurance liabilities to the Japan Earthquake Reinsurance Company (JER), which in turn retrocedes a substantial portion to the government’s Special Account for Earthquake Reinsurance, managed by the Ministry of Finance. Net retentions at private carriers will therefore be a fraction of the headline figure.
On penetration, the earthquake insurance attachment rate – the share of fire insurance policies that include an earthquake rider – stood at 69.7%, while the household penetration rate against total dwellings was 35.1%, according to JER data published in Toa Re’s Japan’s Insurance Market 2025. Verisk explicitly cites take-up rate uncertainty as a factor in its loss range. For context, the 2016 Kumamoto sequence produced approximately JPY 391 billion in dwelling insurance payments alone, according to the General Insurance Association of Japan (GIAJ) – and the current event’s gross estimate sits within reach of that figure before recoveries are applied.
For any broker placing Japan property cat programs, Asian technology sector risks, or global supply chain covers, the Kumamoto event is a prompt to review policy language – not after claims are filed, but now.
