On the desk today · Aon
Insurance companies need insurance too. Aon arranges it — and collects from both sides.
| NYSE · AON |
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The Company That Insures
the Insurance Companies
In 1919, a 16-year-old kid named W. Clement Stone started selling accident insurance policies on the streets of Chicago. He went door to door. He made cold calls. He was relentless. By the 1960s, his Combined Insurance Company of America was a national force. But Stone had a problem — he was a salesman, not a strategist. The company stagnated.
Meanwhile, a young entrepreneur named Patrick Ryan was building something different. In 1964, Ryan founded the Ryan Insurance Group, pioneering the idea of selling insurance through car dealerships — credit life and extended warranty coverage. His model was brokerage, not underwriting. He connected buyers with sellers and collected a commission without ever taking the risk.
In 1982, the two forces merged. Ryan became CEO. Stone retired. And the combined company — renamed Aon in 1987, from the Gaelic word meaning "one" — became one of the largest insurance brokers on earth.
I asked a friend who runs a mid-size insurance company a question last month. Who insures you? She paused. Then she explained something I had never thought about. Insurance companies don't keep all the risk they take on. They transfer a portion of it — sometimes a large portion — to reinsurance companies. And the broker who arranges that transfer, who sits between the insurer and the reinsurer and collects a fee from both, is often Aon.
Most people have heard of insurance brokers — the person who helps you shop for homeowners coverage. Aon operates at a different altitude entirely. It advises the world's largest corporations on risk strategy and places their commercial insurance. It brokers reinsurance — insurance for insurance companies — through Aon Reinsurance Solutions. And it manages retirement, health benefits, and talent consulting for employers across 120 countries through its Human Capital division.
Greg Case has been CEO since 2005 — 21 years at the helm. Under his leadership, Aon transformed from a scattered conglomerate of insurance businesses into a focused, two-segment platform: Risk Capital and Human Capital. In 2024, the company made its largest acquisition ever — NFP Corp., a middle-market insurance broker, for approximately $13.4 billion. In 2025, it sold NFP's wealth management arm for a $1.2 billion gain, keeping the brokerage and pocketing the profit.
In fiscal 2025, Aon reported $17.2 billion in revenue — up 9% from the year before, with 6% organic growth. Risk Capital — the insurance and reinsurance brokerage — generated $11.3 billion at a 30.4% operating margin. Human Capital — retirement, health, and talent — contributed $5.9 billion. Cash flow from operations reached $3.5 billion. And the company paid down $1.9 billion in debt while returning capital to shareholders. The operating margin expanded for the sixth year in a row, reaching 25.3%.
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That 30.4% operating margin in Risk Capital tells you what happens when you broker risk without carrying any. Aon doesn't underwrite a single policy. It doesn't pay a single claim. When a hurricane hits Florida, Aon doesn't lose money — the insurer and the reinsurer absorb the loss. Aon already collected its fee the moment the policy was placed. The worse the year for catastrophes, the higher the premiums — and the higher Aon's commissions on the next renewal cycle.
The reinsurance business is where the model becomes most elegant. When an insurance company like Allstate writes homeowners policies across the Gulf Coast, it can't keep all that hurricane exposure on its own balance sheet. It transfers a portion to reinsurance companies — Swiss Re, Munich Re, Berkshire Hathaway. Aon Reinsurance Solutions arranges the transfer. It analyzes the risk, structures the program, and places the coverage. The reinsurer pays Aon a brokerage fee. The insurer pays Aon a consulting fee. Both sides write a check to the broker who carries none of the risk.
The Human Capital business adds a second compounding engine. Aon advises employers on retirement plans, health benefits, and talent strategy. As the cost of employee benefits rises — and it has been rising for decades — employers need more help navigating the complexity. Aon gets paid to advise. In 2025, Human Capital revenue grew 13% to $5.9 billion, with the operating margin expanding to 23.9%.
The flywheel runs on complexity. The more complex the regulatory environment, the more valuable the broker. The more catastrophic the loss year, the higher the premiums — and the larger Aon's commission. The more expensive healthcare gets, the more employers need Aon's consulting. Every layer of complexity in the global economy adds a layer of revenue for the company that helps clients manage it. Aon doesn't need the world to get simpler. It needs the world to stay complicated. And it always does.
WHY THIS WORKS
Zero underwriting risk. Aon never takes a dollar of insurance risk. It brokers and advises. When a catastrophe hits, insurers and reinsurers pay — Aon already collected its fee.
The reinsurance layer is invisible and essential. Most people don't know that insurance companies buy insurance. Aon arranges those transactions — collecting from both the insurer and the reinsurer — in a market that grows with every natural disaster.
Complexity is the product. Risk regulation, healthcare costs, retirement rules, and tax codes get more complex every year. Each new layer of complexity increases the demand for Aon's advisory services.
21 years of one CEO, one strategy. Greg Case took over in 2005 and simplified Aon from a sprawling conglomerate into a two-segment platform. Operating margin has expanded for six consecutive years. Revenue has grown from $8 billion to $17 billion.
On September 11, 2001, Aon lost 176 employees — the second-highest corporate loss of any company that day. The firm's offices occupied floors 92 and 98 through 105 of the South Tower. The company rebuilt. It did not leave New York. It did not abandon the clients who depended on it. Twenty-four years later, Aon operates in 120 countries, employs more than 50,000 people, and serves as the advisor between the world's risk and the world's capital. The name means "one." The business was forged in loss — and built to ensure that others never carry theirs alone.
