Why the $61B Cat Bond Market Needs Real-Time Trigger Monitoring

Revised September 23, 2026. The original version of this post said most cat bonds use parametric triggers. That was wrong, and the section below now carries our own catalog's counts. The argument about tooling stands; the market it describes is smaller and more specific than we first wrote.

The insurance-linked securities (ILS) market crossed $61 billion in outstanding catastrophe bonds in 2025, according to Artemis. Cat bonds are now a mainstream fixed-income asset class, held by pension funds, endowments, and dedicated ILS fund managers across Zurich, London, Bermuda, and New York.

Yet the tooling available to monitor these positions in real time is, to put it charitably, inadequate.

The Trigger Problem

A cat bond settles on one of four triggers. Of the 245 outstanding bonds Calchis tracks from the Artemis Deal Directory (September 2026), 162 are indemnity — they settle on the sponsor's own audited claims. 76 settle on an industry loss index, in the United States the PCS Catastrophe Loss Index published by Verisk's Property Claim Services. 7 are parametric. By principal the picture is similar: roughly $48 billion indemnity, $15 billion industry loss, under $2 billion parametric.

Only the parametric slice is written on a physical measurement — sustained wind above a stated speed inside a defined box, a USGS magnitude above a stated value near a stated point, a gauge above a stated stage. Those are the triggers a public federal feed can measure while the event is still happening. An indemnity bond cannot be measured from outside the sponsor's books, and an industry-loss bond waits for the index.

Small in count is not small in consequence. A parametric trigger is binary, and the position behind it can be tens of millions of dollars. Today the people holding those positions watch NOAA advisories, check USGS feeds, and compare values against trigger schedules in spreadsheets. During an active Gulf hurricane that process is unacceptable, and it is the same process at 2 AM.

What Exists Today

The incumbents do different jobs, and none of them is this one. Verisk and Moody's RMS model the risk for the offering circular before issuance and act as calculation agent after a potential trigger event — reconciling event reports against the bond's terms once the event is over. PCS publishes an industry loss estimate for a designated catastrophe from insurer reports; a preliminary figure arrives weeks after the event and is resurveyed until final. Event-response products deliver hazard footprints and imagery in hours to days. Each is authoritative for what it is. Not one of them is a live measurement against a threshold you defined, delivered while the advisory cycle is still running.

Broker desks at Aon, Guy Carpenter, and Gallagher Re send event notifications, but these are advisory emails, not structured data feeds. They cannot be programmatically compared against a portfolio of trigger schedules.

Bloomberg Terminal provides weather data and some catastrophe analytics, but does not offer parametric trigger monitoring as a native feature. Fund managers cobble together alerts from multiple sources and hope they don't miss a threshold breach at 2 AM.

The Calchis Approach

Calchis ingests data directly from the authoritative federal sources — USGS for seismic events, NOAA NHC for tropical cyclones, National Weather Service flood warnings for gauge stage and crest — and evaluates parametric triggers against live event data every 5 minutes.

Each trigger is defined with precise geographic coordinates (or WKT polygons for territory-based triggers), a physical measurement type (wind speed in knots, magnitude, gauge stage in feet), and a threshold value. When an event enters the monitoring radius, Calchis tracks the percentage of threshold reached and alerts at a configurable warning level.

The output is structured, auditable, and delivered via webhook for enterprise clients. Every trigger evaluation is logged with the source data, timestamp, and current measurement value, and a breach is recorded as a content-addressed determination anyone can recompute from the cited source (the determination standard). This is the audit trail that compliance teams require.

It is not a settlement. The calculation agent's determination stands, PCS's index is PCS's, and Calchis carries no industry-loss number of its own. What we publish is what the authoritative source reported, when, against the threshold you set.

Market Timing

ILS issuance reached a record $17.7 billion in 2024. The market is growing because reinsurance capacity is constrained and cat bonds offer capital markets investors uncorrelated returns. But growth creates operational pressure: more positions to monitor, more triggers to track, more events to evaluate.

The $61B ILS market deserves purpose-built trigger monitoring infrastructure. Spreadsheets are not infrastructure.