Wildfires open AM Best's top-50 reinsurer table

AM Best's market segment report on the world's 50 largest reinsurers opens with the January 2025 California wildfires, which senior financial analyst Christopher Pennings says "led to a rough start for the year," and the table of the 50 largest that follows is best read as a footnote to that warning.

Annual league tables smooth as easily as they rank: a January catastrophe lands in the first quarter, then gets absorbed into twelve months of premiums and reserve movements, so a listing of the 50 largest will make the fires look more manageable than the underwriting quarter felt. Scale is not experience.

The list can move for reasons that have nothing to do with claims, and this publication has seen it happen: in August, Munich Re reclaimed the top reinsurer ranking as the euro moves the math, a shift driven by currency translation rather than by underwriting. AM Best's wildfire caveat is the opposite kind of reminder, because the market's 2025 story was set in the opening months of the year, before most of the premiums counted in the table had been earned.

That timing gap matters well beyond the 50 names on the page, because traditional reinsurers hold a January loss inside a twelve-month income statement, which can make the event look smaller by the time the annual surplus is struck. Much of the collateralized market settles against the event more directly, and a balance-sheet ranking built from traditional carriers has little to say about how the loss was actually shared.

The most useful line in the report is the first one. A ranking that has to begin with a fire in California is a reminder that the order of names says more about the accounting calendar than about who navigated the year best.