Aon plc: what the price is pricing in

The price implies cash-flow growth of 6.5% a year; our model expects 7.9%. The gap is too narrow for a position this quarter. Switch lens below to see the same question asked of earnings, growth, sales and book value.

What growth in cash flow is the price paying for?

The price implies cash-flow growth of 6.5% a year; our model expects 7.9%.

Gap too narrow for a position this quarter

What the price implies What our model expects

Quarters with a position150 long, 15 short, since June 30, 2010

Beat the S&P 5008 of 1553.3% of quarters held

Strategy against the index−24.3%cumulative; worst fall -30.0%

$10,000 became$73,313S&P 500 bought and held: $98,380

Over time

The growth in owner earnings (free cash flow after stock-based pay) that would justify the share price in our discounted-cash-flow model, against the growth the model itself assumes from the company's record.

Growth our model assumes Growth the price implies Long quarter Short quarter. Lower panel: the share price at each quarter end, adjusted for later share splits and spin-offs (the table below gives the price as traded).

$10,000 trading the gap vs the S&P 500

StrategyS&P 500, buy and hold Hypothetical, before costs. The strategy holds the S&P 500 and only changes on a signal: it switches into AON in long quarters and adds a short of AON in short quarters. The gap between the lines is what the signal added or lost.

Skill or luck?

In plain English: Across 15 quarters with a position, this lens beat the S&P 500 in 8, by −1.6% a quarter on average. That could easily be chance. One company is a small sample: the results across all companies are the better guide.

Positions	Quarters	Beat the S&P 500	Average vs S&P 500, a quarter	Typical (median), a quarter	A year	Confidence (t)	Evidence
Longs	0	—	—	—	—	—	—
Shorts	15	53.3%	−1.6%	+1.1%	−7.2%	-0.81	No reliable evidence
All positions	15	53.3%	−1.6%	+1.1%	−7.2%	-0.81	No reliable evidence

Each position is measured against the S&P 500 over the same quarter: a long earns the stock's return minus the index's, a short the index's minus the stock's. "A year" compounds the per-quarter results. Evidence: strong at a t-statistic of 2 or more, some from 1.5; "worse" when the result is that far below zero; one company's history is a small sample, so read these alongside the results across all companies.

Every quarter (66)

From	Price paid	Growth the price implies	Growth our model assumes	Position	AON	S&P 500
September 30, 2026 (open)	$276.77	6.5%	7.9%	No position	+19.3%	−0.8%
June 30, 2026	$331.69	8.6%	9.1%	No position	−16.4%	+2.4%
March 31, 2026	$322.78	8.5%	10.3%	No position	+3.0%	+15.1%
December 31, 2025	$352.88	10.7%	12.6%	No position	−8.5%	−4.4%
September 30, 2025	$356.58	11.1%	14.4%	No position	−1.0%	+2.7%
June 30, 2025	$356.76	11.5%	15.2%	No position	+0.2%	+8.1%
March 31, 2025	$399.09	12.8%	13.1%	No position	−10.4%	+10.8%
December 31, 2024	$359.16	12.3%	10.5%	No position	+11.3%	−4.3%
September 30, 2024	$345.99	14.7%	8.2%	No position	+4.0%	+2.5%
June 30, 2024	$293.58	11.1%	6.6%	No position	+18.1%	+5.8%
March 31, 2024	$333.72	11.4%	6.9%	No position	−11.8%	+4.4%
December 31, 2023	$291.02	10.8%	5.9%	No position	+14.9%	+10.4%
September 30, 2023	$324.22	13.2%	4.5%	No position	−10.1%	+11.6%
June 30, 2023	$345.20	13.6%	3.7%	No position	−5.9%	−3.2%
March 31, 2023	$315.29	12.4%	3.3%	No position	+9.7%	+8.7%
December 31, 2022	$300.14	12.7%	3.7%	No position	+5.2%	+7.5%
September 30, 2022	$267.87	11.5%	5.2%	No position	+12.3%	+7.6%
June 30, 2022	$269.68	12.8%	6.5%	No position	−0.5%	−4.9%
March 31, 2022	$325.63	17.2%	7.2%	No position	−17.0%	−16.1%
December 31, 2021	$300.56	16.7%	6.7%	Short	+8.6%	−4.6%
September 30, 2021	$285.77	14.0%	4.8%	No position	+5.3%	+11.1%
June 30, 2021	$238.76	13.2%	2.3%	Short	+19.9%	+0.6%
March 31, 2021	$230.11	14.4%	2.0%	Short	+4.0%	+8.4%
December 31, 2020	$211.27	14.8%	2.5%	Short	+9.2%	+6.3%
September 30, 2020	$206.30	18.5%	2.8%	Short	+2.7%	+12.1%
June 30, 2020	$192.60	20.5%	3.9%	Short	+7.3%	+9.0%
March 31, 2020	$165.04	18.2%	3.8%	Short	+17.0%	+20.2%
December 31, 2019	$208.29	21.2%	2.0%	Short	−20.6%	−19.4%
September 30, 2019	$193.57	20.7%	2.0%	Short	+7.8%	+9.0%
June 30, 2019	$192.98	18.9%	2.0%	Short	+0.5%	+1.8%
March 31, 2019	$170.70	15.4%	2.5%	Short	+13.3%	+4.2%
December 31, 2018	$145.36	12.5%	4.8%	No position	+17.7%	+13.5%
September 30, 2018	$153.78	13.2%	5.7%	No position	−5.2%	−13.5%
June 30, 2018	$137.17	12.0%	5.2%	No position	+12.7%	+7.7%
March 31, 2018	$140.33	13.2%	2.0%	Short	−2.0%	+3.5%
December 31, 2017	$134.00	11.0%	2.0%	No position	+5.0%	−1.0%
September 30, 2017	$146.10	10.9%	2.0%	No position	−8.1%	+6.8%
June 30, 2017	$132.95	10.2%	4.0%	No position	+10.2%	+4.4%
March 31, 2017	$118.69	10.2%	4.0%	No position	+12.3%	+3.1%
December 31, 2016	$111.53	8.8%	4.0%	No position	+6.7%	+5.9%
September 30, 2016	$112.49	8.8%	4.0%	No position	−0.6%	+4.0%
June 30, 2016	$109.23	9.0%	2.0%	No position	+3.3%	+3.8%
March 31, 2016	$104.45	8.5%	2.0%	No position	+4.9%	+2.5%
December 31, 2015	$92.21	8.1%	2.0%	No position	+13.7%	+1.3%
September 30, 2015	$88.61	7.9%	2.0%	No position	+4.4%	+7.0%
June 30, 2015	$99.68	9.1%	2.0%	No position	−10.8%	−6.4%
March 31, 2015	$96.12	10.0%	2.1%	No position	+4.0%	+0.2%
December 31, 2014	$94.83	13.1%	2.1%	Short	+1.6%	+0.9%
September 30, 2014	$87.67	13.4%	3.3%	Short	+8.5%	+4.9%
June 30, 2014	$90.09	13.7%	5.2%	No position	−2.4%	+1.1%
March 31, 2014	$84.28	11.5%	7.1%	No position	+7.2%	+5.2%
December 31, 2013	$83.89	16.4%	9.0%	No position	+0.7%	+1.7%
September 30, 2013	$74.44	20.1%	8.8%	Short	+12.9%	+10.5%
June 30, 2013	$64.35	16.6%	8.4%	No position	+16.0%	+5.2%
March 31, 2013	$61.50	12.2%	8.4%	No position	+5.0%	+2.9%
December 31, 2012	$55.61	12.3%	8.7%	No position	+10.9%	+10.5%
September 30, 2012	$52.29	16.1%	13.1%	No position	+6.7%	−0.4%
June 30, 2012	$46.78	25.3%	18.2%	No position	+12.1%	+6.3%
March 31, 2012	$49.06	15.9%	20.0%	No position	−4.4%	−2.8%
December 31, 2011	$46.80	7.0%	13.0%	No position	+5.2%	+12.7%
September 30, 2011	$41.98	12.2%	20.0%	No position	+11.8%	+11.6%
June 30, 2011	$51.30	15.7%	20.0%	No position	−17.9%	−13.8%
March 31, 2011	$52.96	15.7%	12.1%	No position	−2.9%	+0.0%
December 31, 2010	$46.01	11.5%	4.5%	No position	+15.5%	+5.9%
September 30, 2010	$39.11	8.8%	3.7%	No position	+18.1%	+10.8%
June 30, 2010	$37.12	11.7%	2.5%	No position	+5.8%	+11.2%

Price paid: the closing price that day as traded, before any later share split.

What growth in earnings is the price paying for?

The price implies earnings growth of 0.1% a year; our model expects 7.9%.

Gap too narrow for a position this quarter

What the price implies What our model expects

Quarters with a position165 long, 11 short, since June 30, 2010

Beat the S&P 5007 of 1643.8% of quarters held

Strategy against the index−35.5%cumulative; worst fall -35.5%

$10,000 became$62,712S&P 500 bought and held: $98,380

Over time

The earnings growth the price-to-earnings ratio requires, against the growth our model assumes. Net income is already after interest, so it is valued at the return shareholders require, plus spare cash (none for banks and insurers, whose cash is funded by deposits and policies), with no debt subtracted.

Growth our model assumes Growth the P/E implies Long quarter Short quarter. Lower panel: the share price at each quarter end, adjusted for later share splits and spin-offs (the table below gives the price as traded).

$10,000 trading the gap vs the S&P 500

Skill or luck?

In plain English: Across 16 quarters with a position, this lens beat the S&P 500 in 7, by −2.6% a quarter on average. That leans towards losing, though it could still be chance. One company is a small sample: the results across all companies are the better guide.

Positions	Quarters	Beat the S&P 500	Average vs S&P 500, a quarter	Typical (median), a quarter	A year	Confidence (t)	Evidence
Longs	5	40.0%	−1.4%	−1.5%	−6.0%	-0.64	Too few quarters
Shorts	11	45.5%	−3.1%	−4.2%	−12.3%	-1.82	Some evidence: worse
All positions	16	43.8%	−2.6%	−2.8%	−10.4%	-1.93	Some evidence: worse

Every quarter (66)

From	Price paid	Growth the P/E implies	Growth our model assumes	Position	AON	S&P 500
September 30, 2026 (open)	$276.77	0.1%	7.9%	No position	+19.3%	−0.8%
June 30, 2026	$331.69	3.2%	9.1%	No position	−16.4%	+2.4%
March 31, 2026	$322.78	4.0%	10.3%	No position	+3.0%	+15.1%
December 31, 2025	$352.88	11.0%	12.6%	No position	−8.5%	−4.4%
September 30, 2025	$356.58	12.1%	14.4%	No position	−1.0%	+2.7%
June 30, 2025	$356.76	12.5%	15.2%	No position	+0.2%	+8.1%
March 31, 2025	$399.09	13.8%	13.1%	No position	−10.4%	+10.8%
December 31, 2024	$359.16	13.5%	10.5%	No position	+11.3%	−4.3%
September 30, 2024	$345.99	11.6%	8.2%	No position	+4.0%	+2.5%
June 30, 2024	$293.58	7.2%	6.6%	No position	+18.1%	+5.8%
March 31, 2024	$333.72	9.9%	6.9%	No position	−11.8%	+4.4%
December 31, 2023	$291.02	6.6%	5.9%	No position	+14.9%	+10.4%
September 30, 2023	$324.22	8.9%	4.5%	No position	−10.1%	+11.6%
June 30, 2023	$345.20	10.5%	3.7%	No position	−5.9%	−3.2%
March 31, 2023	$315.29	9.3%	3.3%	No position	+9.7%	+8.7%
December 31, 2022	$300.14	7.4%	3.7%	No position	+5.2%	+7.5%
September 30, 2022	$267.87	16.8%	5.2%	Short	+12.3%	+7.6%
June 30, 2022	$269.68	18.7%	6.5%	Short	−0.5%	−4.9%
March 31, 2022	$325.63	24.4%	7.2%	Short	−17.0%	−16.1%
December 31, 2021	$300.56	29.1%	6.7%	Short	+8.6%	−4.6%
September 30, 2021	$285.77	12.8%	4.8%	No position	+5.3%	+11.1%
June 30, 2021	$238.76	9.5%	2.3%	No position	+19.9%	+0.6%
March 31, 2021	$230.11	10.2%	2.0%	No position	+4.0%	+8.4%
December 31, 2020	$211.27	10.3%	2.5%	No position	+9.2%	+6.3%
September 30, 2020	$206.30	10.5%	2.8%	No position	+2.7%	+12.1%
June 30, 2020	$192.60	10.6%	3.9%	No position	+7.3%	+9.0%
March 31, 2020	$165.04	9.2%	3.8%	No position	+17.0%	+20.2%
December 31, 2019	$208.29	14.0%	2.0%	Short	−20.6%	−19.4%
September 30, 2019	$193.57	13.9%	2.0%	Short	+7.8%	+9.0%
June 30, 2019	$192.98	17.1%	2.0%	Short	+0.5%	+1.8%
March 31, 2019	$170.70	15.9%	2.5%	Short	+13.3%	+4.2%
December 31, 2018	$145.36	20.2%	4.8%	Short	+17.7%	+13.5%
September 30, 2018	$153.78	20.5%	5.7%	Short	−5.2%	−13.5%
June 30, 2018	$137.17	10.7%	5.2%	No position	+12.7%	+7.7%
March 31, 2018	$140.33	16.6%	2.0%	Short	−2.0%	+3.5%
December 31, 2017	$134.00	8.4%	2.0%	No position	+5.0%	−1.0%
September 30, 2017	$146.10	8.8%	2.0%	No position	−8.1%	+6.8%
June 30, 2017	$132.95	9.7%	4.0%	No position	+10.2%	+4.4%
March 31, 2017	$118.69	7.3%	4.0%	No position	+12.3%	+3.1%
December 31, 2016	$111.53	5.3%	4.0%	No position	+6.7%	+5.9%
September 30, 2016	$112.49	5.7%	4.0%	No position	−0.6%	+4.0%
June 30, 2016	$109.23	6.6%	2.0%	No position	+3.3%	+3.8%
March 31, 2016	$104.45	5.8%	2.0%	No position	+4.9%	+2.5%
December 31, 2015	$92.21	5.0%	2.0%	No position	+13.7%	+1.3%
September 30, 2015	$88.61	4.4%	2.0%	No position	+4.4%	+7.0%
June 30, 2015	$99.68	5.2%	2.0%	No position	−10.8%	−6.4%
March 31, 2015	$96.12	5.2%	2.1%	No position	+4.0%	+0.2%
December 31, 2014	$94.83	6.5%	2.1%	No position	+1.6%	+0.9%
September 30, 2014	$87.67	6.1%	3.3%	No position	+8.5%	+4.9%
June 30, 2014	$90.09	7.9%	5.2%	No position	−2.4%	+1.1%
March 31, 2014	$84.28	7.8%	7.1%	No position	+7.2%	+5.2%
December 31, 2013	$83.89	8.7%	9.0%	No position	+0.7%	+1.7%
September 30, 2013	$74.44	7.8%	8.8%	No position	+12.9%	+10.5%
June 30, 2013	$64.35	5.1%	8.4%	No position	+16.0%	+5.2%
March 31, 2013	$61.50	5.2%	8.4%	No position	+5.0%	+2.9%
December 31, 2012	$55.61	4.1%	8.7%	No position	+10.9%	+10.5%
September 30, 2012	$52.29	3.4%	13.1%	No position	+6.7%	−0.4%
June 30, 2012	$46.78	1.2%	18.2%	Long	+12.1%	+6.3%
March 31, 2012	$49.06	2.1%	20.0%	Long	−4.4%	−2.8%
December 31, 2011	$46.80	2.0%	13.0%	Long	+5.2%	+12.7%
September 30, 2011	$41.98	1.4%	20.0%	Long	+11.8%	+11.6%
June 30, 2011	$51.30	6.9%	20.0%	Long	−17.9%	−13.8%
March 31, 2011	$52.96	9.4%	12.1%	No position	−2.9%	+0.0%
December 31, 2010	$46.01	4.2%	4.5%	No position	+15.5%	+5.9%
September 30, 2010	$39.11	2.0%	3.7%	No position	+18.1%	+10.8%
June 30, 2010	$37.12	1.0%	2.5%	No position	+5.8%	+11.2%

Price paid: the closing price that day as traded, before any later share split.

Is the price-to-earnings ratio cheap or dear for the growth delivered?

Aon plc trades on 15.1 times earnings while its earnings per share grew 12.3% a year: a PEG of 1.23.

Gap too narrow for a position this quarter

PEG: under 0.75 cheap for the growth, over 3 expensive

Quarters with a position131 long, 12 short, since March 31, 2013

Beat the S&P 5006 of 1346.2% of quarters held

Strategy against the index−23.1%cumulative; worst fall -24.8%

$10,000 became$46,090S&P 500 bought and held: $60,376

Over time

The P/E divided by the earnings-per-share growth delivered over three years. Under 0.75 the market pays little for the growth (long); over 3 it pays a lot (short).

EPS growth, 3 years (%) Price-to-earnings ratio (x) Long quarter Short quarter. Lower panel: the share price at each quarter end, adjusted for later share splits and spin-offs (the table below gives the price as traded).

$10,000 trading the gap vs the S&P 500

Skill or luck?

In plain English: Across 13 quarters with a position, this lens beat the S&P 500 in 6, by −1.9% a quarter on average. That could easily be chance. One company is a small sample: the results across all companies are the better guide.

Positions	Quarters	Beat the S&P 500	Average vs S&P 500, a quarter	Typical (median), a quarter	A year	Confidence (t)	Evidence
Longs	1	0.0%	−5.7%	−5.7%	−21.0%	—	Too few quarters
Shorts	12	50.0%	−1.5%	−0.5%	−6.6%	-0.93	No reliable evidence
All positions	13	46.2%	−1.9%	−2.0%	−7.8%	-1.20	No reliable evidence

Every quarter (50)

From	Price paid	Price-to-earnings ratio (x)	EPS growth, 3 years (%)	Position	AON	S&P 500
September 30, 2026 (open)	$276.77	15.1x	12.3%	No position	+19.3%	−0.8%
June 30, 2026	$331.69	18.1x	13.7%	No position	−16.4%	+2.4%
March 31, 2026	$322.78	18.9x	11.9%	No position	+3.0%	+15.1%
September 30, 2025	$356.58	29.8x	20.9%	No position	−1.0%	+2.7%
June 30, 2025	$356.76	30.5x	24.3%	No position	+0.2%	+8.1%
March 31, 2025	$399.09	32.8x	31.0%	No position	−10.4%	+10.8%
December 31, 2024	$359.16	32.2x	42.8%	No position	+11.3%	−4.3%
September 30, 2024	$345.99	28.9x	11.0%	No position	+4.0%	+2.5%
June 30, 2024	$293.58	22.7x	11.8%	No position	+18.1%	+5.8%
March 31, 2024	$333.72	26.3x	14.0%	No position	−11.8%	+4.4%
December 31, 2023	$291.02	21.9x	19.3%	No position	+14.9%	+10.4%
September 30, 2023	$324.22	25.0x	19.6%	No position	−10.1%	+11.6%
June 30, 2023	$345.20	27.3x	21.6%	No position	−5.9%	−3.2%
March 31, 2023	$315.29	25.5x	24.0%	No position	+9.7%	+8.7%
December 31, 2022	$300.14	22.8x	27.7%	No position	+5.2%	+7.5%
September 30, 2022	$267.87	38.7x	5.0%	Short	+12.3%	+7.6%
June 30, 2022	$269.68	42.8x	7.8%	Short	−0.5%	−4.9%
March 31, 2022	$325.63	57.8x	6.5%	Short	−17.0%	−16.1%
December 31, 2021	$300.56	74.0x	9.2%	Short	+8.6%	−4.6%
September 30, 2021	$285.77	31.2x	41.7%	Long	+5.3%	+11.1%
June 30, 2021	$238.76	25.8x	23.6%	No position	+19.9%	+0.6%
March 31, 2021	$230.11	27.0x	33.0%	No position	+4.0%	+8.4%
December 31, 2020	$211.27	27.1x	13.3%	No position	+9.2%	+6.3%
September 30, 2020	$206.30	27.3x	9.0%	Short	+2.7%	+12.1%
June 30, 2020	$192.60	27.5x	10.8%	No position	+7.3%	+9.0%
March 31, 2020	$165.04	25.5x	7.2%	Short	+17.0%	+20.2%
December 31, 2019	$208.29	33.1x	4.6%	Short	−20.6%	−19.4%
September 30, 2019	$193.57	32.9x	3.4%	Short	+7.8%	+9.0%
June 30, 2019	$192.98	39.2x	0.1%	Short	+0.5%	+1.8%
June 30, 2018	$137.17	27.7x	0.1%	Short	+12.7%	+7.7%
December 31, 2017	$134.00	24.5x	7.8%	Short	+5.0%	−1.0%
September 30, 2017	$146.10	24.9x	12.8%	No position	−8.1%	+6.8%
June 30, 2017	$132.95	26.1x	10.4%	No position	+10.2%	+4.4%
March 31, 2017	$118.69	22.8x	13.5%	No position	+12.3%	+3.1%
December 31, 2016	$111.53	20.3x	17.6%	No position	+6.7%	+5.9%
September 30, 2016	$112.49	20.8x	19.2%	No position	−0.6%	+4.0%
June 30, 2016	$109.23	21.9x	16.3%	No position	+3.3%	+3.8%
March 31, 2016	$104.45	20.9x	17.8%	No position	+4.9%	+2.5%
December 31, 2015	$92.21	20.0x	16.5%	No position	+13.7%	+1.3%
September 30, 2015	$88.61	19.3x	16.7%	No position	+4.4%	+7.0%
June 30, 2015	$99.68	20.2x	18.8%	No position	−10.8%	−6.4%
March 31, 2015	$96.12	20.2x	17.5%	No position	+4.0%	+0.2%
December 31, 2014	$94.83	21.7x	16.0%	No position	+1.6%	+0.9%
September 30, 2014	$87.67	21.3x	14.6%	No position	+8.5%	+4.9%
June 30, 2014	$90.09	23.5x	15.2%	No position	−2.4%	+1.1%
March 31, 2014	$84.28	23.6x	14.2%	No position	+7.2%	+5.2%
December 31, 2013	$83.89	24.7x	12.0%	No position	+0.7%	+1.7%
September 30, 2013	$74.44	23.4x	11.3%	No position	+12.9%	+10.5%
June 30, 2013	$64.35	20.3x	11.5%	No position	+16.0%	+5.2%
March 31, 2013	$61.50	20.3x	5.2%	Short	+5.0%	+2.9%

Price paid: the closing price that day as traded, before any later share split.

What profit margin is the price paying for?

The price implies an owner-earnings margin of 18.1%; the company has kept 19.6%.

Gap too narrow for a position this quarter

What the price implies What the company delivered

Quarters with a position390 long, 39 short, since June 30, 2010

Beat the S&P 50018 of 3946.2% of quarters held

Strategy against the index−37.2%cumulative; worst fall -50.0%

$10,000 became$59,555S&P 500 bought and held: $98,380

Over time

The owner-earnings margin (free cash flow after stock pay, as a share of revenue) the price requires at our model's growth, against the margin the company has delivered over three years.

Margin delivered Margin the price implies Long quarter Short quarter. Lower panel: the share price at each quarter end, adjusted for later share splits and spin-offs (the table below gives the price as traded).

$10,000 trading the gap vs the S&P 500

Skill or luck?

In plain English: Across 39 quarters with a position, this lens beat the S&P 500 in 18, by −0.9% a quarter on average. That could easily be chance. One company is a small sample: the results across all companies are the better guide.

Positions	Quarters	Beat the S&P 500	Average vs S&P 500, a quarter	Typical (median), a quarter	A year	Confidence (t)	Evidence
Longs	0	—	—	—	—	—	—
Shorts	39	46.2%	−0.9%	−1.0%	−4.7%	-0.68	No reliable evidence
All positions	39	46.2%	−0.9%	−1.0%	−4.7%	-0.68	No reliable evidence

Every quarter (66)

From	Price paid	Margin the price implies	Margin delivered	Position	AON	S&P 500
September 30, 2026 (open)	$276.77	18.1%	19.6%	No position	+19.3%	−0.8%
June 30, 2026	$331.69	19.7%	20.3%	No position	−16.4%	+2.4%
March 31, 2026	$322.78	18.6%	20.6%	No position	+3.0%	+15.1%
December 31, 2025	$352.88	18.1%	20.1%	No position	−8.5%	−4.4%
September 30, 2025	$356.58	16.9%	20.4%	No position	−1.0%	+2.7%
June 30, 2025	$356.76	16.7%	20.5%	No position	+0.2%	+8.1%
March 31, 2025	$399.09	21.4%	21.8%	No position	−10.4%	+10.8%
December 31, 2024	$359.16	23.8%	21.5%	No position	+11.3%	−4.3%
September 30, 2024	$345.99	27.4%	19.0%	Short	+4.0%	+2.5%
June 30, 2024	$293.58	25.7%	20.0%	Short	+18.1%	+5.8%
March 31, 2024	$333.72	27.0%	20.8%	Short	−11.8%	+4.4%
December 31, 2023	$291.02	26.1%	19.7%	Short	+14.9%	+10.4%
September 30, 2023	$324.22	31.8%	19.5%	Short	−10.1%	+11.6%
June 30, 2023	$345.20	35.7%	20.5%	Short	−5.9%	−3.2%
March 31, 2023	$315.29	34.6%	20.7%	Short	+9.7%	+8.7%
December 31, 2022	$300.14	33.0%	19.8%	Short	+5.2%	+7.5%
September 30, 2022	$267.87	27.6%	19.3%	Short	+12.3%	+7.6%
June 30, 2022	$269.68	26.1%	18.4%	Short	−0.5%	−4.9%
March 31, 2022	$325.63	30.4%	17.4%	Short	−17.0%	−16.1%
December 31, 2021	$300.56	29.3%	16.8%	Short	+8.6%	−4.6%
September 30, 2021	$285.77	31.7%	19.0%	Short	+5.3%	+11.1%
June 30, 2021	$238.76	32.5%	17.6%	Short	+19.9%	+0.6%
March 31, 2021	$230.11	33.5%	16.6%	Short	+4.0%	+8.4%
December 31, 2020	$211.27	30.8%	15.3%	Short	+9.2%	+6.3%
September 30, 2020	$206.30	29.8%	12.4%	Short	+2.7%	+12.1%
June 30, 2020	$192.60	26.4%	10.4%	Short	+7.3%	+9.0%
March 31, 2020	$165.04	23.2%	10.4%	Short	+17.0%	+20.2%
December 31, 2019	$208.29	31.9%	11.0%	Short	−20.6%	−19.4%
September 30, 2019	$193.57	30.7%	10.8%	Short	+7.8%	+9.0%
June 30, 2019	$192.98	30.2%	11.7%	Short	+0.5%	+1.8%
March 31, 2019	$170.70	26.5%	12.8%	Short	+13.3%	+4.2%
December 31, 2018	$145.36	20.2%	13.1%	Short	+17.7%	+13.5%
September 30, 2018	$153.78	20.3%	13.3%	Short	−5.2%	−13.5%
June 30, 2018	$137.17	19.3%	13.2%	Short	+12.7%	+7.7%
March 31, 2018	$140.33	25.8%	13.7%	Short	−2.0%	+3.5%
December 31, 2017	$134.00	25.4%	15.2%	Short	+5.0%	−1.0%
September 30, 2017	$146.10	28.2%	17.1%	Short	−8.1%	+6.8%
June 30, 2017	$132.95	24.1%	17.0%	Short	+10.2%	+4.4%
March 31, 2017	$118.69	22.4%	15.8%	Short	+12.3%	+3.1%
December 31, 2016	$111.53	20.0%	15.2%	No position	+6.7%	+5.9%
September 30, 2016	$112.49	19.1%	14.5%	No position	−0.6%	+4.0%
June 30, 2016	$109.23	20.4%	13.7%	Short	+3.3%	+3.8%
March 31, 2016	$104.45	18.5%	12.7%	Short	+4.9%	+2.5%
December 31, 2015	$92.21	17.1%	12.1%	Short	+13.7%	+1.3%
September 30, 2015	$88.61	16.6%	11.8%	No position	+4.4%	+7.0%
June 30, 2015	$99.68	17.9%	11.9%	Short	−10.8%	−6.4%
March 31, 2015	$96.12	17.5%	11.1%	Short	+4.0%	+0.2%
December 31, 2014	$94.83	17.2%	9.3%	Short	+1.6%	+0.9%
September 30, 2014	$87.67	15.6%	8.8%	Short	+8.5%	+4.9%
June 30, 2014	$90.09	14.1%	8.8%	Short	−2.4%	+1.1%
March 31, 2014	$84.28	12.0%	9.4%	No position	+7.2%	+5.2%
December 31, 2013	$83.89	11.0%	7.3%	No position	+0.7%	+1.7%
September 30, 2013	$74.44	10.3%	5.5%	No position	+12.9%	+10.5%
June 30, 2013	$64.35	9.5%	6.0%	No position	+16.0%	+5.2%
March 31, 2013	$61.50	9.4%	7.6%	No position	+5.0%	+2.9%
December 31, 2012	$55.61	8.6%	7.1%	No position	+10.9%	+10.5%
September 30, 2012	$52.29	6.6%	5.6%	No position	+6.7%	−0.4%
June 30, 2012	$46.78	4.6%	3.2%	No position	+12.1%	+6.3%
March 31, 2012	$49.06	4.4%	5.5%	No position	−4.4%	−2.8%
December 31, 2011	$46.80	6.2%	8.6%	No position	+5.2%	+12.7%
September 30, 2011	$41.98	4.3%	6.6%	No position	+11.8%	+11.6%
June 30, 2011	$51.30	5.5%	7.0%	No position	−17.9%	−13.8%
March 31, 2011	$52.96	9.6%	7.8%	No position	−2.9%	+0.0%
December 31, 2010	$46.01	12.1%	8.2%	No position	+15.5%	+5.9%
September 30, 2010	$39.11	10.1%	7.6%	No position	+18.1%	+10.8%
June 30, 2010	$37.12	10.5%	6.2%	No position	+5.8%	+11.2%

Price paid: the closing price that day as traded, before any later share split.

What return on equity is the price paying for?

The price implies a return on equity of 39.5%; the company earned 44.9%.

Market more pessimistic than our model: long this quarter

What the price implies What the company delivered

Quarters with a position451 long, 44 short, since June 30, 2010

Beat the S&P 50022 of 4548.9% of quarters held

Strategy against the index−45.0%cumulative; worst fall -62.2%

$10,000 became$32,439S&P 500 bought and held: $61,791

Over time

The return on equity that justifies the price-to-book ratio, (P/B)(r − g) + g with an 8.5% required return and 2.5% long-run growth, against the return the company delivered last year.

Return on equity delivered Return on equity the price implies Long quarter Short quarter. Lower panel: the share price at each quarter end, adjusted for later share splits and spin-offs (the table below gives the price as traded).

$10,000 trading the gap vs the S&P 500

Skill or luck?

In plain English: Across 45 quarters with a position, this lens beat the S&P 500 in 22, by −1.0% a quarter on average. That could easily be chance. One company is a small sample: the results across all companies are the better guide.

Positions	Quarters	Beat the S&P 500	Average vs S&P 500, a quarter	Typical (median), a quarter	A year	Confidence (t)	Evidence
Longs	1	100.0%	+1.5%	+1.5%	+6.2%	—	Too few quarters
Shorts	44	47.7%	−1.1%	−0.8%	−5.4%	-0.97	No reliable evidence
All positions	45	48.9%	−1.0%	−0.8%	−5.2%	-0.94	No reliable evidence

Every quarter (58)

From	Price paid	Return on equity the price implies	Return on equity delivered	Position	AON	S&P 500
September 30, 2026 (open)	$276.77	39.5%	44.9%	Long	+19.3%	−0.8%
June 30, 2026	$331.69	46.1%	46.8%	No position	−16.4%	+2.4%
March 31, 2026	$322.78	47.3%	47.8%	No position	+3.0%	+15.1%
December 31, 2025	$352.88	60.3%	38.3%	Short	−8.5%	−4.4%
September 30, 2025	$356.58	61.8%	38.0%	Short	−1.0%	+2.7%
June 30, 2025	$356.76	69.1%	36.4%	Short	+0.2%	+8.1%
March 31, 2025	$399.09	87.9%	43.4%	Short	−10.4%	+10.8%
December 31, 2024	$359.16	77.9%	39.0%	Short	+11.3%	−4.3%
September 30, 2024	$345.99	78.1%	86.0%	Long	+4.0%	+2.5%
September 30, 2022	$267.87	507.0%	57.8%	Short	+12.3%	+7.6%
June 30, 2022	$269.68	300.0%	50.2%	Short	−0.5%	−4.9%
March 31, 2022	$325.63	413.0%	55.1%	Short	−17.0%	−16.1%
December 31, 2021	$300.56	186.5%	31.9%	Short	+8.6%	−4.6%
September 30, 2021	$285.77	90.1%	51.9%	Short	+5.3%	+11.1%
June 30, 2021	$238.76	79.2%	56.8%	Short	+19.9%	+0.6%
March 31, 2021	$230.11	93.7%	57.3%	Short	+4.0%	+8.4%
December 31, 2020	$211.27	86.1%	51.7%	Short	+9.2%	+6.3%
September 30, 2020	$206.30	82.8%	47.5%	Short	+2.7%	+12.1%
June 30, 2020	$192.60	88.0%	41.4%	Short	+7.3%	+9.0%
March 31, 2020	$165.04	72.0%	40.7%	Short	+17.0%	+20.2%
December 31, 2019	$208.29	88.1%	38.8%	Short	−20.6%	−19.4%
September 30, 2019	$193.57	76.0%	34.1%	Short	+7.8%	+9.0%
June 30, 2019	$192.98	61.6%	23.8%	Short	+0.5%	+1.8%
March 31, 2019	$170.70	62.9%	24.4%	Short	+13.3%	+4.2%
December 31, 2018	$145.36	52.8%	16.3%	Short	+17.7%	+13.5%
September 30, 2018	$153.78	52.7%	16.1%	Short	−5.2%	−13.5%
June 30, 2018	$137.17	41.4%	22.4%	Short	+12.7%	+7.7%
December 31, 2017	$134.00	42.5%	26.5%	Short	+5.0%	−1.0%
September 30, 2017	$146.10	44.4%	28.0%	Short	−8.1%	+6.8%
June 30, 2017	$132.95	39.5%	24.7%	Short	+10.2%	+4.4%
March 31, 2017	$118.69	37.4%	24.3%	Short	+12.3%	+3.1%
December 31, 2016	$111.53	35.7%	26.1%	Short	+6.7%	+5.9%
September 30, 2016	$112.49	35.6%	24.6%	Short	−0.6%	+4.0%
June 30, 2016	$109.23	36.5%	23.5%	Short	+3.3%	+3.8%
March 31, 2016	$104.45	31.5%	22.0%	Short	+4.9%	+2.5%
December 31, 2015	$92.21	29.2%	20.0%	Short	+13.7%	+1.3%
September 30, 2015	$88.61	26.3%	18.7%	Short	+4.4%	+7.0%
June 30, 2015	$99.68	29.5%	19.8%	Short	−10.8%	−6.4%
March 31, 2015	$96.12	28.3%	19.0%	Short	+4.0%	+0.2%
December 31, 2014	$94.83	25.9%	17.5%	Short	+1.6%	+0.9%
September 30, 2014	$87.67	23.1%	16.3%	Short	+8.5%	+4.9%
June 30, 2014	$90.09	23.4%	15.2%	Short	−2.4%	+1.1%
March 31, 2014	$84.28	21.9%	14.0%	Short	+7.2%	+5.2%
December 31, 2013	$83.89	23.4%	13.4%	Short	+0.7%	+1.7%
September 30, 2013	$74.44	21.2%	12.9%	Short	+12.9%	+10.5%
June 30, 2013	$64.35	18.8%	12.8%	Short	+16.0%	+5.2%
March 31, 2013	$61.50	18.1%	12.5%	Short	+5.0%	+2.9%
December 31, 2012	$55.61	15.8%	11.7%	No position	+10.9%	+10.5%
September 30, 2012	$52.29	15.4%	11.6%	No position	+6.7%	−0.4%
June 30, 2012	$46.78	13.8%	11.6%	No position	+12.1%	+6.3%
March 31, 2012	$49.06	14.8%	12.0%	No position	−4.4%	−2.8%
December 31, 2011	$46.80	14.0%	13.3%	No position	+5.2%	+12.7%
September 30, 2011	$41.98	12.8%	12.7%	No position	+11.8%	+11.6%
June 30, 2011	$51.30	15.1%	11.2%	No position	−17.9%	−13.8%
March 31, 2011	$52.96	15.8%	10.4%	Short	−2.9%	+0.0%
December 31, 2010	$46.01	15.9%	11.4%	No position	+15.5%	+5.9%
September 30, 2010	$39.11	14.7%	11.5%	No position	+18.1%	+10.8%
June 30, 2010	$37.12	14.2%	11.9%	No position	+5.8%	+11.2%

Price paid: the closing price that day as traded, before any later share split.

How the test works

At each quarter end since March 2010 we rebuild the models from Aon plc's quarters ending at least 90 days earlier (and no more than 200 days before that), using the figures as later filed, including any restatement, and value them at that day's close, adjusted for later share splits and spin-offs so that price and share count are on the same basis. A wide enough gap is a long or a short for one quarter (growth 10 points; margin and return on equity 5 points; a PEG under 0.75 or over 3), measured on total return against the S&P 500. The rules were set before the test. No trading or borrowing costs; today's list of companies. Not investment advice. All companies and the results across them.

Compare with peers

Head to head: AJG vs AON AON vs MRSH AON vs WTW

More: Insurance Brokers stocks compared, Financials sector, rankings of US companies

Figures from Aon plc's SEC filings (10-K and 10-Q), retrieved October 29, 2026. How we read and check them: methodology and data sources. Not investment advice. Back to Aon plc.