Aon (MEX:AONN) Cyclically Adjusted PS Ratio: (As of Sep. 20, 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.
Reviewed by: Charlie Tian Charlie Tian
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.

MEX:AONN Aon PLC MEX:AONN
85 GF Score
Price MXN5,120.00
GF Value MXN6,600.94
Valuation Modestly Undervalued
! 1 Warning Sign
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What is Aon Cyclically Adjusted PS Ratio?

Shiller PE for Stocks: The True Measure of Stock Valuation


Aon  (MEX:AONN) 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 - 6.39 5.76 6.30 5.42

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 5.73 5.65 5.38 4.69 4.53

MEX:AONN vs AJG, MRSH, WTW: 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.


MEX:AONN
85GF Score
Aon PLC MEX:AONN
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)
=345.302/128.6700*128.6700
=345.302

Current CPI (Jun. 2026) = 128.6700.

Aon Quarterly Data

Revenue per Share CPI Adj_RevenuePerShare
201609 153.197 100.274 196.580
201612 195.159 99.676 251.927
201703 181.504 100.374 232.671
201706 166.697 100.673 213.056
201709 163.081 100.474 208.847
201712 216.377 100.075 278.204
201803 231.028 100.573 295.570
201806 198.595 101.072 252.823
201809 181.309 101.371 230.136
201812 222.266 100.773 283.797
201903 247.649 101.670 313.417
201906 204.267 102.168 257.253
201909 191.712 102.268 241.206
201912 234.123 102.068 295.142
202003 271.318 102.367 341.032
202006 248.855 101.769 314.635
202009 227.102 101.072 289.114
202012 266.009 101.072 338.645
202103 313.430 102.367 393.964
202106 253.450 103.364 315.500
202109 238.517 104.859 292.678
202112 287.811 106.653 347.224
202203 350.602 109.245 412.943
202206 276.914 112.779 315.932
202209 253.858 113.504 287.778
202212 296.505 115.436 330.498
202303 349.447 117.609 382.311
202306 274.455 119.662 295.116
202309 245.222 120.749 261.309
202312 294.149 120.749 313.446
202403 352.340 120.990 374.705
202406 303.139 122.318 318.880
202409 322.691 121.594 341.470
202412 379.728 122.439 399.052
202503 444.822 123.405 463.800
202506 381.354 124.492 394.153
202509 343.671 124.810 354.300
202512 363.431 125.770 371.811
202603 410.385 127.830 413.082
202606 345.302 128.670 345.302

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 (MEX:AONN) Overvalued in 2026?

Based on GuruFocus' analysis, Aon stock appears to be undervalued. The current stock price of MXN5,120.00 is trading 22.4% below its estimated GF Value™ of MXN6,600.94. GuruFocus considers Aon to be Modestly Undervalued.

Key valuation signals for MEX:AONN:

  • Cyclically Adjusted PS Ratio:
  • GF Value™: MXN6,600.94 vs. price of MXN5,120.00 (22.4% below fair value)
  • GF Score™: 85/100 with 1 warning sign

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


Aon Business Description

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.
85GF Score

Get the complete analysis for MEX:AONN

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

MXN5,120.00
Price
MXN6,600.94
GF Value