Aon closed at 377.14 on July 29, down 1.1% that day and up about 14% over six months. The company’s recent filings show a business that throws off cash and posts healthy margins — but those same filings also flag that fresh top-line momentum is thin.
Start with the thing that pays the bills: cash.
> "Free cash flow, a non-GAAP measure defined under the caption “Review of Consolidated Results — Free Cash Flow,” was $3.2 billion in 2025, an increase of $401 million, or 14%, from $2.8 billion in 2024, reflecting an increase in cash flows from operations, partially offset by a $45 million increase in capital expenditures." (Aon / 10-K / 2026-02-13)
That $3.2 billion is real money. Revenue for 2025 was 17.2B and net margin moved to 21.5% in the latest annual period, so the company is converting a decent chunk of sales into cash. At the same time Aon carries leverage — enterprise value 95.3B and net debt of 13.5B — so cash flow isn’t just discretionary.
Now the friction: growth cooling.
> "Organic revenue growth was 1% in the first quarter of 2026, reflecting growth in Retirement, driven by continued demand for advisory work in the UK and EMEA related to the ongoing impact of regulatory change, partially offset by continued soft advisory demand in the U.S." (Aon / 10-Q / 2026-05-01)
One percent organic growth in Q1 is much slower than the higher growth seen in prior years (2024 revenue rose 17.4%) and the 9.4% year-over-year lift in 2025. Management points to pockets of demand — notably Retirement in EMEA — while U.S. advisory activity is soft. That contrast highlights a shift from a period of stronger growth toward a situation with sizable cash generation but more modest near-term organic momentum.
Management is also plowing money into growth and reshaping costs.
> "Total operating expenses increased $51 million, or 2%, in the first quarter of 2026 due primarily to the increase in expense associated with 5% organic revenue growth and investments in long-term growth, as well as the unfavorable impact of foreign currency translation, partially offset by lower expenses associated with the sale of the NFP Wealth business and $25 million of net restructuring savings." (Aon / 10-Q / 2026-05-01)
So operating spend ticked up as Aon invests, yet the company also realized $25 million of restructuring savings. That push-pull — invest now, harvest later — is why free cash flow can rise even as near-term organic growth softens.
How the market prices that mix matters more than the business changing overnight. Aon trades at a P/E of 22.2x (a small premium to peers) with EV/sales 5.5x. The company’s scenario work lays out a wide-ish valuation spread driven mainly by the multiple assigned at exit: the bull and base cases lean on a higher exit multiple and stronger revenue CAGRs, the bear case assumes a lower multiple and slower revenue growth.
Other mechanics are visible in the filings: diluted shares rose 2.2% in the last year, interest-rate dynamics show up in reported interest and other items, and pension contributions for the rest of 2026 are expected to be around $65 million — a number that’s exposed to foreign-exchange moves.
The simplest tension from the filings: Aon is throwing off cash and margin is higher, but current organic demand is muted and the company is reinvesting while also trimming costs. Whether the cash profile or the growth profile matters more to investors will largely come down to how the market values the company.
*Free cash flow was $3.2 billion in 2025 and organic revenue growth was 1% in Q1 2026 — company filings.*