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.
Southern CoMEX:SO 65 Shiller PE Ratio is 23.09 as of Sep. 16, 2026, which is 2% above its 10-year median of 22.60. GuruFocus rates MEX:SO with a GF Score™ of 65/100 and a GF Value™ of MXN1,492.35 (Fairly Valued). The stock has 5 warning signs investors should review. Among 399 Utilities - Regulated companies, Southern Co ranks worse than 74.94% on this metric.
As of today (2026-09-16), Southern Co's current share price is MXN1622.00. Southern Co's E10 for the quarter that ended in Jun. 2026 was MXN70.25. Southern Co's Shiller PE Ratio for today is 23.09.
The historical rank and industry rank for Southern Co's Shiller PE Ratio or its related term are showing as below:
MEX:SO'
s Shiller PE Ratio Range Over the Past 10 Years
Min: 17.58 Med: 22.6 Max: 28.08
Current: 23.83
During the past years, Southern Co's highest Shiller PE Ratio was 28.08. The lowest was 17.58. And the median was 22.60.
MEX:SO's Shiller PE Ratio is ranked worse than 74.94% of 399
companies
in the Utilities - Regulated industry
Industry Median: 16.75
vs MEX:SO: 23.83
E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller PE Ratio calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years.
Southern Co's adjusted earnings per share data for the three months ended in Jun. 2026 was MXN17.898. Add all the adjusted EPS for the past 10 years together and divide 10 will get our E10, which is MXN70.25 for the trailing ten years ended in Jun. 2026.
Shiller PE for Stocks: The True Measure of Stock Valuation
Compared with the regular PE Ratio, which works poorly for cyclical businesses, the Shiller PE Ratio smoothed out the fluctuations of profit margins during business cycles. Therefore it is more accurate in reflecting the valuation of the company.
If a company has consistent business performance, the Shiller PE Ratio should give similar results to regular PE Ratio.
Compared with the PS Ratio, the Shiller PE Ratio makes the comparison between different industries more meaningful.
Be Aware
Shiller PE Ratio assumes that over the long term, businesses and profitability revert to their means. If a company's business model does not work in the future compared with the past, Shiller PE Ratio and PS Ratio will give false valuations.
Southern Co Shiller PE Ratio Related Terms
Southern Co Shiller PE Ratio Historical Data
* Premium members only.
The historical data trend for Southern Co's Shiller PE 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:SO vs DUK, AEP, D: Shiller PE Ratio Comparison
For the Utilities - Regulated Electric subindustry, Southern Co's Shiller PE Ratio, along with its competitors' market caps and Shiller PE 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.
Southern Co Shiller PE Ratio vs Utilities - Regulated Industry
For the Utilities - Regulated industry and Utilities sector, Southern Co's Shiller PE Ratio distribution charts can be found below:
* The bar in red indicates where Southern Co's Shiller PE Ratio falls into.
For Shiller PE Ratio, the earnings of the past 10 years are inflation-adjusted and averaged. The result is used for P/E calculation. Since it looks at the average over the last 10 years, the Shiller PE Ratio is also called PE10.
The Shiller PE Ratio was first used by professor Robert Shiller to measure the valuation of the overall market. The same calculation is applied here to individual companies.
Southern Co's Shiller PE 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.
Southern Co's E10 for the quarter that ended in Jun. 2026 is calculated as:
For example, Southern Co's adjusted earnings per share data for the three months ended in Jun. 2026 was:
Add all the adjusted EPS together and divide 10 will get our E10.
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.
Southern Co (MEX:SO) has a Shiller PE Ratio of 23.09 as of Sep. 16, 2026. Shiller price-earnings ratio is the ratio of share price to a company's inflation-adjusted earnings over a 10-year period. View historical data on Southern Co and its competitors. This is near median its historical median of 22.60. Over the past decade, Southern Co's Shiller PE Ratio has ranged from 17.58 to 28.08. According to the industry distribution chart, Southern Co ranks #299 out of 399 companies in the Utilities - Regulated industry, placing it in the top 74.9%.
Is Southern Co's Shiller PE Ratio too high?
Southern Co's current Shiller PE Ratio of 23.09 is near median its 10-year median of 22.60. Over the past 10 years, this metric has ranged from a low of 17.58 to a high of 28.08. The Utilities - Regulated industry median Shiller PE Ratio is 16.75. Southern Co's value of 23.09 is 37.9% above this industry median. Based on the distribution chart, Southern Co ranks #299 out of 399 companies in the Utilities - Regulated industry, which is below the industry midpoint. Overall, Southern Co has a GF Score™ of 65/100 and is considered Fairly Valued, reflecting its overall financial health beyond just this single metric.
How does Southern Co's Shiller PE Ratio compare to DUK and AEP?
According to the Utilities - Regulated industry distribution chart, Southern Co ranks #299 out of 399 companies for Shiller PE Ratio. This places Southern Co in the lower half of its industry. The industry median Shiller PE Ratio is 16.75. Southern Co's value of 23.09 is 37.9% above this benchmark. Historically, Southern Co's own Shiller PE Ratio has ranged from 17.58 to 28.08 over the past decade. While the company's 10-year median is 22.60 vs. the industry median of 16.75, Southern Co 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 Shiller PE Ratio for an Utilities - Regulated company?
The median Shiller PE Ratio among Utilities - Regulated companies is 16.75, based on 399 companies in the industry. Companies in the top quartile (top 25%) have a Shiller PE Ratio significantly above this median, while those in the bottom quartile fall well below. However, Shiller PE Ratio should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Southern Co's current Shiller PE Ratio of 23.09 is 37.9% 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 Shiller PE Ratio mean?
A high Shiller PE Ratio can signal that a stock is expensive relative to its fundamentals. Shiller price-earnings ratio is the ratio of share price to a company's inflation-adjusted earnings over a 10-year period. View historical data on Southern Co and its competitors. For the Utilities - Regulated industry, the median Shiller PE Ratio is 16.75 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Southern Co's current Shiller PE Ratio is 23.09, which is near median its own 10-year median of 22.60. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Southern Co stock overvalued right now?
Based on GuruFocus' analysis, Southern Co (MEX:SO) is currently considered Fairly Valued. The stock's GF Value™ is MXN1,492.35, compared to a current price of MXN1,622.00 — trading 8.7% above its estimated fair value. The current Shiller PE Ratio is 23.09, which is near median its 10-year median of 22.60 and 37.9% above the Utilities - Regulated industry median of 16.75. Southern Co's overall GF Score™ is 65/100 with 5 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Shiller PE Ratio calculated?
Shiller PE Ratio is calculated from a company's financial statements. For Southern Co (MEX:SO), the current Shiller PE Ratio is 23.09 as of Sep. 16, 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 Southern Co (MEX:SO) Overvalued in 2026?
Based on GuruFocus' analysis, Southern Co stock appears to be overvalued.
The current stock price of MXN1,622.00 is trading 8.7% above its estimated GF Value™ of MXN1,492.35.
GuruFocus considers Southern Co to be Fairly Valued.
Key valuation signals for MEX:SO:
Shiller PE Ratio: 23.09 (near median its 10-year median of 22.60)
GF Value™: MXN1,492.35 vs. price of MXN1,622.00 (8.7% above fair value)
Industry Position: 37.9% above the Utilities - Regulated median (#299 of 399)
No single metric tells the full story. See the MEX:SO stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Southern is one of the largest utilities in the US. The company serves 9 million customers with vertically integrated electric utilities in three states and natural gas distribution utilities in four states. It owns 46 gigawatts of rate-regulated generating capacity, primarily for serving customers in Georgia, Alabama, and Mississippi. Subsidiary Southern Power owns 13 gigawatts of natural gas generation and renewable energy across the US and sells the electricity primarily under long-term contracts.
65GF Score
Get the complete analysis for MEX:SO
Shiller PE 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:SO has been successfully added to your 
