Aon CEO warns clustered AI data centers could scare off insurers and lenders

Greg Case has a warning for anyone betting billions on AI: build your data centers too close together and the insurance math might break the deal. The Aon CEO told CNBC Wednesday that piling enormous computing capacity into a small number of locations creates concentration risk that makes projects tougher to cover. And when coverage gets hard, the financing falls apart — as Case put it, you can't access the debt markets.

The exposure is measured in minutes, not months. Case told CNBC data centers will essentially tally business interruption in millions of dollars per minute. That helps explain why Aon has assembled specialized facilities — pools of capacity aimed at a single industry or risk — including a $10 billion data center facility and a $2.5 billion energy facility.

Aon's own books show the boom already paying off. Commercial risk organic revenue grew 7% in the third quarter, fueled by a record pipeline of data center projects, while adjusted earnings per share rose 10%, hitting $3.36. Adjusted operating margin widened 70 basis points, reaching 27%.

Next on deck: Aon's pending $17 billion acquisition of USI Insurance Services, expected to close in the fourth quarter. Bundled with NFP, which Aon bought in 2024, it forms a middle-market platform of roughly $6.5 billion — and Case argues those smaller clients face the same tangled risks as global giants. The deal is debt-financed, Aon plans to prioritize cutting leverage over the next two years, and the company expects $395 million in annual earnings benefits, including $280 million in cost savings and $115 million in revenue synergies.

Cyber risk isn't waiting around either. Researchers disclosed two critical flaws in PHP, a programming language behind roughly 70% of websites, on Oct. 21 — bugs that could let attackers run malicious code on unpatched servers without authentication, with AI playing a major role in spotting and analyzing them through cybersecurity firms Calif and Google's Wiz, along with OpenAI. Case said the industry has to keep up and keep evolving, and he has a number in mind: global insurance capital sits at about $4.5 trillion and should double or triple, to what he called 5 trillion, 10 to 15 trillion.

He wants institutional investors, pension funds, sovereign wealth funds and wealthy individuals to carry risks insurers and reinsurers traditionally hold — sources he sizes at roughly $250 trillion. Aon is angling to be more than a broker matching clients to insurers, but a market maker creating new markets, Case said. He also pushed back on reading softer commercial premiums as a permanent soft market, noting some clients are using lower unit prices to restructure programs and buy more coverage.