What is AON's forecasted revenue?

Aon Plc is forecasted to generate $18.7B in FY revenue, representing +8.7% year-over-year growth.

How accurate is the AON revenue forecast model?

The ARDL model achieves 5.5% MAPE (Mean Absolute Percentage Error). In a holdout test, it predicted $4.3B versus the actual $4.3B.

Aon Plc AON

Revenue Intelligence Report • 70 quarters of SEC filing data • Updated 2026-03-15

Aon’s revenue is forecast to grow about 8.7% year over year to roughly $20.3 billion, supported by durable demand across risk, retirement and advisory services and ongoing pricing power. In our econometric model, structural/platform growth accounts for about 58% of the revenue uplift, with SG&A investments contributing around 42% and R&D essentially flat. The time-varying analysis shows the SG&A multiplier has declined from 0.42 to 0.12, signaling rising operating leverage and that growth is increasingly driven by platform scale and recurring revenue rather than incremental spending. The binding constraint on revenue growth is delivery capacity—the ability to staff and service more client engagements. Key risk: if talent recruitment, deployment or utilization cannot keep pace with demand, the upside to the forecast could be limited.

Investment Thesis

The econometric model achieves strong accuracy (5.5% MAPE), suggesting Aon Plc's revenue trajectory is well-characterized by its spending patterns. Each $1 of SG&A spending generates $2.14 in revenue, reflecting strong commercial efficiency.

Next FY Revenue

$18.7B

+8.7% YoY

SG&A Multiplier

$2.14 per $1

Model Accuracy

5.5% MAPE

Holdout validation: The model predicted $4.3B vs the actual $4.3B — an error of 0.5%.

Note: Aon Plc does not report R&D expenses separately. This analysis uses SG&A spending only.

Revenue Forecast

Quarterly Detail

Quarter	Model Forecast	Actual	95% Range	YoY Growth	Status
Q4 2025	$4.3B	$4.3B	$3.4B – $5.5B	+4.2%	✓ In range
Q2 2026	$4.5B		$3.5B – $5.8B	-4.4%
Q3 2026	$4.6B		$3.6B – $6.0B	+11.8%
Q4 2026	$4.7B		$3.6B – $6.2B	+18.2%
Q1 2027	$4.8B		$3.7B – $6.3B	+11.5%

Seasonal Factors

Multiplicative seasonal adjustment: These factors capture Aon Plc's systematic quarterly revenue patterns relative to the trend model. A factor of 1.05 means that quarter typically runs 5% above the underlying trend; 0.95 means 5% below. Factors are computed as the median of (actual / fitted) across all available quarters.

Fiscal Quarter	Seasonal Factor	vs Trend	Interpretation	Obs.
FQ1 (Sep–Nov)	0.983	-1.7%	In line with trend	17
FQ2 (Dec–Feb)	1.0362	+3.6%	+3.6% above trend	17
FQ3 (Mar–May)	1.0256	+2.6%	In line with trend	16
FQ4 (Jun–Aug)	0.9679	-3.2%	-3.2% below trend	16

How Spending Drives Revenue

Reading this chart: Each line shows the cumulative revenue generated per $1 spent over subsequent quarters. The effect builds over 4-5 quarters as investments mature.

Spending Efficiency Over Time

Time-varying analysis: A penalized spline model (GAM) tracks how the link between spending and revenue has evolved over 70 quarters. A rising multiplier means each dollar of spending drives more revenue over time, signaling improving efficiency. A falling multiplier can indicate market saturation or rising cost-to-acquire.
Current SG&A multiplier: 0.1212

Enhanced forecast: The time-varying model (GAM) outperformed the fixed-coefficient ARDL on holdout validation (0.5% error vs ARDL, R² = 0.769), so this report uses the GAM for its quarterly forecasts.

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