Aon (NYSE: AON) lifts adjusted margin on 6% organic growth, but operating income dips

Posted by Bonnie Powley on Oct 28th, 2026

What happened

Aon plc (NYSE: AON) lifted third-quarter 2026 revenue 3% to $4.1 billion and adjusted EPS 10% to $3.36, up from $3.05 a year earlier.

The figures come from its Oct. 28 earnings release. Reported growth understates the underlying business. Organic revenue grew 6%. That measure strips out currency, fiduciary investment income, acquisitions and divestitures. Divestitures, mostly the sales of the NFP Wealth business and Stroz Friedberg, took 3% off reported growth.

Diluted EPS under GAAP rose 6% to $2.23 from $2.11. Aon also expects the USI acquisition to close in the fourth quarter of 2026. It signed a definitive agreement to buy USI during the third quarter.

Key numbers

Metric	Latest	Change	Source
Total revenue	$4.10 billion	from $4.00 billion, +3%	SEC 8-K, Exhibit 99.1
Organic revenue growth	6%	from 5%	SEC 8-K, Exhibit 99.1
Adjusted EPS	$3.36	from $3.05, +10%	SEC 8-K, Exhibit 99.1
Adjusted operating margin	27.0%	from 26.3%, +0.7 percentage points	SEC 8-K, Exhibit 99.1
Operating income (GAAP)	$809 million	from $816 million, -1%	SEC 8-K, Exhibit 99.1
Free cash flow	$1.10 billion	from $1.08 billion, +2%	SEC 8-K, Exhibit 99.1

Read more: Aon (AON) company research

Where the growth came from

Growth was broad. Organic revenue rose 7% in Commercial Risk Solutions, 7% in Reinsurance Solutions, 6% in Health Solutions and 4% in Wealth Solutions.

Reinsurance Solutions growth includes a favorable item from the reversal of a constraint previously applied to revenue.

By segment, Risk Capital revenue rose $157 million, or 6%, to $2.7 billion. Human Capital revenue fell $54 million, or 4%, to $1.4 billion. Wealth Solutions revenue dropped to $429 million from $540 million after the NFP Wealth sale.

Adjusted operating margin widened in both segments, to 26.6% from 26.2% in Risk Capital and to 31.0% from 30.5% in Human Capital.

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Why operating income slipped

GAAP operating income fell 1% to $809 million from $816 million. Operating margin fell to 19.7% from 20.4%. Adjusted operating income rose 5%, lifting adjusted margin by 70 basis points to 27.0% from 26.3%.

The two measures differ because of items Aon excludes. By OptimistFi's calculation, adjusted operating income exceeded GAAP operating income by $297 million, up from $235 million a year earlier.

The 2026 adjustments include $175 million of intangible amortization and impairment, $93 million of Accelerating Aon United Program expenses and $25 million of USI transaction costs. The restructuring line was $32 million a year earlier and rose on workforce optimization costs.

The comparison base was also tougher. The prior-year quarter included a $23 million reduction of expense from legal settlements and recoveries. This year, $20 million of net restructuring savings helped offset higher costs.

Interest expense was flat at $206 million. Lower average debt for most of the quarter offset interest on debt issued near quarter-end to fund USI. Interest income rose $24 million on the higher cash balances from that debt.

Net income attributable to Aon shareholders rose 4% to $476 million from $458 million. Adjusted net income rose 8% to $715 million from $660 million.

Why it matters

OptimistFi has argued that Aon turns scale, client relationships and analytics into recurring, high-margin revenue, funded by disciplined cash generation. The quarter fits that view. Net new business and strong retention drove organic growth, and the adjusted margin widened.

Cash backs it up. Free cash flow was $1.10 billion against $1.08 billion a year earlier, up 2%. Capital expenditures rose 36% to $94 million from $69 million. For the first nine months, free cash flow rose 3% to $1.9 billion.

The caveats are real. GAAP operating income fell, and Accelerating Aon United Program expenses rose 191%. USI brings transaction costs now and integration costs for severance, retention awards and systems later. Aon lists failure to realize USI's expected benefits and the level of its debt among its risks.

Aon did not repurchase shares in the quarter. It had about $7.7 billion of repurchase authorization left on Sept. 30. That is a cap, and the company says debt repayment will take priority once USI closes.

What's next

The test is whether the USI acquisition closes in the fourth quarter of 2026. A close would start the path toward Aon's 2.8x-3.0x leverage objective, which the company puts at about 24 months away. A delay or rising integration costs would weaken the case.

On currency, Aon expects a de minimis effect on fourth-quarter adjusted EPS. It expects a favorable effect of $0.42 per share for full-year 2026 if rates stay where they are. Management says it enters the fourth quarter, the final year of its 3×3 Plan, with significant momentum.