Aon (STU:4VK) Cyclically Adjusted PS Ratio: (As of Sep. 20, 2026)

Author: Vera Yuan Vera Yuan
Vera Yuan
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Director of Data and Quant Analytics at GuruFocus
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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.

STU:4VK Aon PLC STU:4VK
93 GF Score
Price €257.30
GF Value €345.77
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  (STU:4VK) 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 7.10 6.60 5.50 6.71 5.49

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 5.60 5.57 5.45 4.88 4.99

STU:4VK 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.


STU:4VK
93GF Score
Aon PLC STU:4VK
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)
=17.073/128.6700*128.6700
=17.073

Current CPI (Jun. 2026) = 128.6700.

Aon Quarterly Data

Revenue per Share CPI Adj_RevenuePerShare
201609 7.319 100.274 9.392
201612 9.122 99.676 11.775
201703 8.388 100.374 10.753
201706 8.166 100.673 10.437
201709 7.792 100.474 9.979
201712 9.695 100.075 12.465
201803 10.036 100.573 12.840
201806 8.590 101.072 10.936
201809 8.213 101.371 10.425
201812 9.826 100.773 12.546
201903 11.358 101.670 14.374
201906 9.504 102.168 11.969
201909 8.874 102.268 11.165
201912 10.984 102.068 13.847
202003 12.286 102.367 15.443
202006 9.687 101.769 12.248
202009 8.796 101.072 11.198
202012 10.855 101.072 13.819
202103 12.783 102.367 16.068
202106 10.508 103.364 13.081
202109 10.101 104.859 12.395
202112 12.130 106.653 14.634
202203 15.241 109.245 17.951
202206 12.958 112.779 14.784
202209 12.449 113.504 14.112
202212 14.773 115.436 16.467
202303 17.457 117.609 19.099
202306 14.248 119.662 15.321
202309 13.208 120.749 14.074
202312 15.577 120.749 16.599
202403 19.104 120.990 20.317
202406 16.330 122.318 17.178
202409 15.518 121.594 16.421
202412 17.715 122.439 18.617
202503 20.708 123.405 21.591
202506 17.231 124.492 17.809
202509 15.783 124.810 16.271
202512 17.060 125.770 17.453
202603 19.976 127.830 20.107
202606 17.073 128.670 17.073

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 (STU:4VK) Overvalued in 2026?

Based on GuruFocus' analysis, Aon stock appears to be undervalued. The current stock price of €257.30 is trading 25.6% below its estimated GF Value™ of €345.77. GuruFocus considers Aon to be Modestly Undervalued.

Key valuation signals for STU:4VK:

  • Cyclically Adjusted PS Ratio:
  • GF Value™: €345.77 vs. price of €257.30 (25.6% below fair value)
  • GF Score™: 93/100 with 1 warning sign

No single metric tells the full story. See the STU:4VK 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.
93GF Score

Get the complete analysis for STU:4VK

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

€257.30
Price
€345.77
GF Value