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.
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.
AonMEX:AONN -2.04%85 Cyclically Adjusted PS Ratio is 4.08 as of Sep. 18, 2026, which is 26% below its 10-year median of 5.51. GuruFocus rates MEX:AONN with a GF Score™ of 85/100 and a GF Value™ of MXN6,602.79 (Modestly Undervalued). The stock has 1 warning sign investors should review. Among 407 Insurance companies, Aon ranks worse than 92.38% on this metric.
As of today (2026-09-18), Aon's current share price is MXN5120.00. Aon's Cyclically Adjusted Revenue per Share for the quarter that ended in Jun. 2026 was MXN1,255.93. Aon's Cyclically Adjusted PS Ratio for today is 4.08.
The historical rank and industry rank for Aon's Cyclically Adjusted PS Ratio or its related term are showing as below:
MEX:AONN'
s Cyclically Adjusted PS Ratio Range Over the Past 10 Years
Min: 3.47 Med: 5.51 Max: 7.63
Current: 4.64
During the past years, Aon's highest Cyclically Adjusted PS Ratio was 7.63. The lowest was 3.47. And the median was 5.51.
MEX:AONN's Cyclically Adjusted PS Ratio is ranked worse than 92.38% of 407
companies
in the Insurance industry
Industry Median: 1.25
vs MEX:AONN: 4.64
The Shiller PE Ratio was first used by professor Robert Shiller. He uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings per share of a company over the past 10 years. The similar calculation is applied by GuruFocus to calculate the Cyclically Adjusted PS Ratio. The Cyclically Adjusted Revenue per Share is the average of the inflation adjusted revenue per share of a company over the past 10 years.
Aon's adjusted revenue per share data for the three months ended in Jun. 2026 was MXN345.302. Add all the adjusted revenue per share for the past 10 years together and divide 10 will get our Cyclically Adjusted Revenue per Share, which is MXN1,255.93 for the trailing ten years ended in Jun. 2026.
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.
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.
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 PS Ratio for today is calculated as
* 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.
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.
What does a Cyclically Adjusted PS Ratio of 4.08 mean?
Aon (MEX:AONN) has a Cyclically Adjusted PS Ratio of 4.08 as of Sep. 18, 2026. Cyclically Adjusted PS Ratio is the ratio of share price to a company's inflation-adjusted revenue per share over a 10-year period. View historical data on Aon and its competitors. This is 26% below median its historical median of 5.51. Over the past decade, Aon's Cyclically Adjusted PS Ratio has ranged from 3.47 to 7.63. According to the industry distribution chart, Aon ranks #376 out of 407 companies in the Insurance industry, placing it in the top 92.4%.
Is Aon's Cyclically Adjusted PS Ratio too high?
Aon's current Cyclically Adjusted PS Ratio of 4.08 is 26% below median its 10-year median of 5.51. Over the past 10 years, this metric has ranged from a low of 3.47 to a high of 7.63. The Insurance industry median Cyclically Adjusted PS Ratio is 1.25. Aon's value of 4.08 is 226.4% above this industry median. Based on the distribution chart, Aon ranks #376 out of 407 companies in the Insurance industry, which is in the bottom quartile relative to peers. Overall, Aon has a GF Score™ of 85/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Aon's Cyclically Adjusted PS Ratio compare to AJG and MRSH?
According to the Insurance industry distribution chart, Aon ranks #376 out of 407 companies for Cyclically Adjusted PS Ratio. This places Aon in the lower half of its industry. The industry median Cyclically Adjusted PS Ratio is 1.25. Aon's value of 4.08 is 226.4% above this benchmark. Historically, Aon's own Cyclically Adjusted PS Ratio has ranged from 3.47 to 7.63 over the past decade. While the company's 10-year median is 5.51 vs. the industry median of 1.25, Aon has consistently been above the industry average. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Cyclically Adjusted PS Ratio for an Insurance company?
The median Cyclically Adjusted PS Ratio among Insurance companies is 1.25, based on 407 companies in the industry. Companies in the top quartile (top 25%) have a Cyclically Adjusted PS Ratio significantly above this median, while those in the bottom quartile fall well below. However, Cyclically Adjusted PS Ratio should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Aon's current Cyclically Adjusted PS Ratio of 4.08 is 226.4% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Cyclically Adjusted PS Ratio mean?
A high Cyclically Adjusted PS Ratio can signal that a stock is expensive relative to its fundamentals. Cyclically Adjusted PS Ratio is the ratio of share price to a company's inflation-adjusted revenue per share over a 10-year period. View historical data on Aon and its competitors. For the Insurance industry, the median Cyclically Adjusted PS Ratio is 1.25 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Aon's current Cyclically Adjusted PS Ratio is 4.08, which is 26% below median its own 10-year median of 5.51. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Aon stock overvalued right now?
Based on GuruFocus' analysis, Aon (MEX:AONN) is currently considered Modestly Undervalued. The stock's GF Value™ is MXN6,602.79, compared to a current price of MXN5,120.00 — trading 22.5% below its estimated fair value. The current Cyclically Adjusted PS Ratio is 4.08, which is 26% below median its 10-year median of 5.51 and 226.4% above the Insurance industry median of 1.25. Aon's overall GF Score™ is 85/100 with 1 warning sign to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Cyclically Adjusted PS Ratio calculated?
Cyclically Adjusted PS Ratio is calculated from a company's financial statements. For Aon (MEX:AONN), the current Cyclically Adjusted PS Ratio is 4.08 as of Sep. 18, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
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 22.5% below its estimated GF Value™ of MXN6,602.79.
GuruFocus considers Aon to be Modestly Undervalued.
Key valuation signals for MEX:AONN:
Cyclically Adjusted PS Ratio: 4.08 (26% below median its 10-year median of 5.51)
GF Value™: MXN6,602.79 vs. price of MXN5,120.00 (22.5% below fair value)
Industry Position: 226.4% above the Insurance median (#376 of 407)
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 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.
Quick Browse
Personalize
Premium Gurus 
Create New Portfolio
MEX:AONN has been successfully added to your 
