Aon (WBO:AON) Cyclically Adjusted PS Ratio: (As of Sep. 16, 2026)

Author: Vera Yuan Vera Yuan
Vera Yuan
Vera Yuan
Director of Data and Quant Analytics at GuruFocus
Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
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Charlie Tian
Charlie Tian
Founder & CEO of GuruFocus
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.

WBO:AON Aon PLC WBO:AON
94 GF Score
Price €269.10
GF Value €341.63
! 1 Warning Sign
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What is Aon Cyclically Adjusted PS Ratio?

Note: If the price history is too short, we do not calculate current Cyclically Adjusted PS Ratio for this stock. All the historical data is shown as the company's primary share's data instead.

Shiller PE for Stocks: The True Measure of Stock Valuation


Aon  (WBO:AON) Cyclically Adjusted PS Ratio Explanation

Compared with the regular PS Ratio, which works poorly for cyclical businesses, the Cyclically Adjusted PS Ratio smoothed out the fluctuations of revenue during business cycles. Therefore it is more accurate in reflecting the valuation of the company.

If a company has consistent business performance, the Cyclically Adjusted PS Ratio should give similar results to regular PS Ratio.


Aon Cyclically Adjusted PS Ratio Related Terms


Aon Cyclically Adjusted PS Ratio Historical Data

* Premium members only.

The historical data trend for Aon's Cyclically Adjusted PS Ratio can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Aon Cyclically Adjusted PS Ratio Chart

Aon Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Cyclically Adjusted PS Ratio
Get a 7-Day Free Trial Premium Member Only Premium Member Only 6.96 6.16 5.48 6.37 5.72

Aon Quarterly Data
Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26 Jun26
Cyclically Adjusted PS Ratio Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only 6.05 5.97 5.72 5.05 5.08

WBO:AON vs : Cyclically Adjusted PS Ratio Comparison

For the Insurance Brokers subindustry, Aon's Cyclically Adjusted PS Ratio, along with its competitors' market caps and Cyclically Adjusted PS Ratio data, can be viewed below:

* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.


Aon Cyclically Adjusted PS Ratio vs Insurance Industry

For the Insurance industry and Financial Services sector, Aon's Cyclically Adjusted PS Ratio distribution charts can be found below:

* The bar in red indicates where Aon's Cyclically Adjusted PS Ratio falls into.


WBO:AON
94GF Score
Aon PLC WBO:AON
Cyclically Adjusted PS Ratio is just one metric. See GF Score™, valuation, warning signs, and more.
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Aon Cyclically Adjusted PS Ratio Calculation

Like the Shiller PE Ratio, the Cyclically Adjusted PS Ratio takes the Revenue per Share from the past 10 years, adjusts it for inflation, and then calculates the average. This average is then used for the P/S calculation. Because it considers this 10-year average, it's often referred to as the CAPS Ratio.

The Shiller PE Ratio was first used by professor Robert Shiller to measure the valuation of the overall market. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted PS Ratio.

Aon's Cyclically Adjusted Revenue per Share for the quarter that ended in Jun. 2026 is calculated as:

For example, Aon's adjusted Revenue per Share data for the three months ended in Jun. 2026 was:

Adj_RevenuePerShare=Revenue per Share/CPI of Jun. 2026 (Change)*Current CPI (Jun. 2026)
=17.23/333.9520*333.9520
=17.230

Current CPI (Jun. 2026) = 333.9520.

Aon Quarterly Data

Revenue per Share CPI Adj_RevenuePerShare
201609 7.274 241.428 10.062
201612 9.367 241.432 12.957
201703 8.338 243.801 11.421
201706 8.032 244.955 10.950
201709 7.630 246.819 10.324
201712 9.674 246.524 13.105
201803 10.016 249.554 13.403
201806 8.861 251.989 11.743
201809 8.197 252.439 10.844
201812 9.942 251.233 13.215
201903 11.414 254.202 14.995
201906 9.499 256.143 12.385
201909 9.034 256.759 11.750
201912 10.970 256.974 14.256
202003 12.423 258.115 16.073
202006 9.492 257.797 12.296
202009 8.672 260.280 11.127
202012 10.564 260.474 13.544
202103 12.981 264.877 16.366
202106 10.506 271.696 12.913
202109 10.189 274.310 12.404
202112 12.317 278.802 14.753
202203 15.399 287.504 17.887
202206 13.144 296.311 14.814
202209 12.808 296.808 14.411
202212 14.137 296.797 15.907
202303 17.458 301.836 19.316
202306 14.214 305.109 15.558
202309 13.524 307.789 14.674
202312 15.321 306.746 16.680
202403 18.713 312.332 20.008
202406 16.376 314.175 17.407
202409 15.351 315.301 16.259
202412 18.150 315.605 19.205
202503 20.075 319.799 20.963
202506 16.578 322.561 17.163
202509 15.715 324.800 16.158
202512 16.962 324.054 17.480
202603 20.215 330.213 20.444
202606 17.230 333.952 17.230

Add all the adjusted revenue per share together and divide 10 will get our Cyclically Adjusted Revenue per Share.

Please note that we use the CPI data of the country/region where the company is headquartered. If the CPI data for that country/region is not available, then we will use the CPI data of the United States as default.

Is Aon (WBO:AON) Overvalued in 2026?

Based on GuruFocus' analysis, Aon stock appears to be undervalued. The current stock price of €269.10 is trading 21.2% below its estimated GF Value™ of €341.63.

Key valuation signals for WBO:AON:

  • Cyclically Adjusted PS Ratio:
  • GF Value™: €341.63 vs. price of €269.10 (21.2% below fair value)
  • GF Score™: 94/100 with 1 warning sign

No single metric tells the full story. See the WBO:AON stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


Aon Business Description

Comparable Companies
Address 15 George\'s Quay, Dublin 2, Dublin, IRL, D02 VR98
Aon is a leading global provider of insurance and reinsurance brokerage and human resources solutions. Its operations are tilted toward its brokerage operations. Headquartered in London, Aon has about 60,000 employees and operations in over 120 countries.
94GF Score

Get the complete analysis for WBO:AON

Cyclically Adjusted PS Ratio is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

€269.10
Price
€341.63
GF Value