For a decade, ethical finance has fixated on banks: which one financed which pipeline, which one underwrote which bond. That fixation is deserved. The world's 65 largest banks have channelled $8.7 trillion into fossil fuels since the Paris Agreement, $906 billion in 2025 alone. But it has let a second industry sit almost entirely unexamined, even though it is doing the same thing, through the same holdings, often in the same companies.

Ask most people what an insurer does with the premium they pay every month, and the picture in their head is roughly a vault: money goes in, and if the house burns down, money comes out. That picture is wrong, and the gap between it and reality is where this story starts.

The premium that doesn't sit still
The moment a premium lands, it becomes what the industry calls "float" — money collected today against a claim that might not be paid for years, sometimes never. Insurers don't let that money wait. They invest it immediately, in equities, bonds, private credit, anything that earns the best returns while the clock runs on the policy. This isn't a side business bolted onto insurance; for most insurers it's as central to the model as the premiums themselves, arguably more so. It's the mechanism Warren Buffett used to build much of Berkshire Hathaway.

Insurers underwrite fossil fuel and arms companies directly too — sell them the liability cover their operations need to run at all. That part is expected. What's easy to miss is whose money funds the investment side: not a separate pot tied to the harmful client's own premium, but the entire pool collected from every policyholder — your home insurance, your car insurance, your life policy — deployed into whatever earns best, fossil fuel and arms companies included, whether or not that company was ever an underwriting client at all. Underwriting is a direct, usually small, commercial relationship with the harmful company. Investment is something else entirely — your money, working for an industry you never chose and were never asked about. A bank only has the first kind of relationship, the loan. An insurer has both, and it's the second, quieter one that dwarfs it in scale.

That doesn't make the underwriting side trivial, though. If anything, the two are equally deliberate: a portfolio manager choosing to hold $1.4 million of Elbit stock is exactly as specific a decision as an underwriter agreeing to cover Elbit's liability risk. What separates them isn't how targeted the decision is, it's what the decision enables. An investment can be sold tomorrow without changing whether the company keeps operating. A withdrawn liability policy can't be shrugged off the same way: in most jurisdictions, a mine, a pipeline, or a weapons plant cannot legally run without that cover in place. Underwriting isn't more damning because it's more specific. It's more damning because it's a precondition, not a preference — and unlike a bank loan, there's no deep capital-markets substitute waiting once an insurer says no.

Who is actually holding what
A UK campaign group, Boycott Bloody Insurance, has researched exactly who — cross-referencing Lloyd's disclosures, US SEC 13F filings, and Urgewald's Global Oil & Gas and Coal Exit Lists. Six major insurers — Allianz, Aviva, AXA, Zurich, Intact (RSA's parent), and Covéa — together hold more than $20 billion in companies on those exclusion lists. Allianz alone holds roughly $9.6 billion in these companies, including recognisable names like ExxonMobil, Shell, TotalEnergies, and Glencore. Aviva holds $7.8 billion, with positions across Shell, BP, Chevron, and ExxonMobil. On the underwriting side, Chubb and Fairfax each earned around $700–750 million in 2024 specifically from insuring fossil fuel operations — a business that campaigners at Insure Our Future have publicly criticised, pointing out that insurers keep underwriting it even as climate-driven losses increasingly eat into whatever it earns them. The case against it isn't some abstract principle. It's that the arithmetic no longer works even on the insurers' own terms, and they keep underwriting it regardless.

On weapons tied to Israel's campaign in Gaza, the same six insurers, plus AIG, Chubb, and Generali, underwrite liability cover for arms manufacturers including Lockheed Martin, Boeing, BAE Systems, and Elbit Systems. Allianz is the only one of the group invested in all sixteen military suppliers tracked, Elbit included; Aviva is the largest single investor at just over $2 billion. UN Special Rapporteur Francesca Albanese named Allianz and AXA directly, calling them active participants in what she termed a "joint criminal enterprise" — a legal characterisation the companies dispute, not a court finding, but built on holdings that are a matter of public record regardless.

The bond nobody names
Allianz owns PIMCO outright. PIMCO's own SEC filings show it holding over a billion dollars of Israeli government debt across some two dozen funds — its flagship Income Fund alone carrying more than $340 million, some of it maturing in 2030. That isn't a stake in a company that arms a state. That's a loan to the state itself, interest collected regardless of what the money funds. Allianz's own disclosure names twenty-one sovereign borrowers individually — the US, Germany, France — and folds Israel into an unlabelled "other." The only reason the PIMCO exposure is visible at all is that US securities law forces the disclosure Allianz's own reporting doesn't volunteer.

The double standard
None of this required a conspiracy. It required only that someone read the filings, which is precisely why almost nobody has. An insurer sells you a policy on your house, invests your premium in the pipeline warming the planet that floods it, and underwrites the liability cover for the company building the pipeline — so if it goes wrong, there's a deep pool of your own money sitting behind the claim. Everyone can name a bank they distrust. Try naming your own buildings insurer's largest fossil fuel holding. You can't, and that's rather the point.

If financing harm disqualifies a bank from holding your money, the same test disqualifies the insurer holding your policy — the mechanism differs, the complicity doesn't. Consistency isn't a technicality. The only real question left is whether we're willing to apply the standard we already claim to hold to the one company we're least in the habit of even suspecting.

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* Reinsurance — insurance for insurers. When an insurer takes on a risk too large to carry alone, it buys cover on that risk from a reinsurer, such as Munich Re or Swiss Re. Reinsurers have no retail customers and are invisible to the public for that reason, but a handful of them sit behind almost every policy in the market, deciding which industries are worth backing.