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.
Alliant EnergySTU:AY1 -0.22%77 Cyclically Adjusted PB Ratio is 2.50 as of Aug. 08, 2026, which is 5% below its 10-year median of 2.64. GuruFocus rates STU:AY1 with a GF Score™ of 77/100 and a GF Value™ of €59.00 (Fairly Valued). The stock has 7 warning signs investors should review. Among 437 Utilities - Regulated companies, Alliant Energy ranks worse than 77.8% on this metric.
The historical rank and industry rank for Alliant Energy's Cyclically Adjusted PB Ratio or its related term are showing as below:
STU:AY1'
s Cyclically Adjusted PB Ratio Range Over the Past 10 Years
Min: 1.98 Med: 2.64 Max: 3.46
Current: 2.54
During the past years, Alliant Energy's highest Cyclically Adjusted PB Ratio was 3.46. The lowest was 1.98. And the median was 2.64.
STU:AY1's Cyclically Adjusted PB Ratio is ranked worse than 77.8% of 437
companies
in the Utilities - Regulated industry
Industry Median: 1.52
vs STU:AY1: 2.54
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 PB Ratio. The Cyclically Adjusted Book per Share is the average of the inflation adjusted book value per share of a company over the past 10 years.
Alliant Energy's adjusted book value per share data for the three months ended in Jun. 2026 was €25.205. Add all the adjusted book value per share for the past 10 years together and divide the count will get our Cyclically Adjusted Book per Share, which is €23.99 for the trailing ten years ended in Jun. 2026.
Shiller PE for Stocks: The True Measure of Stock Valuation
Alliant Energy (STU:AY1) Cyclically Adjusted PB Ratio Explanation
Compared with the regular PB Ratio, which works poorly for cyclical businesses, the Cyclically Adjusted PB Ratio smoothed out the fluctuations of book value 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 PB Ratio should give similar results to regular PB Ratio.
Alliant Energy Cyclically Adjusted PB Ratio Related Terms
Alliant Energy Cyclically Adjusted PB Ratio Historical Data
* Premium members only.
The historical data trend for Alliant Energy's Cyclically Adjusted PB 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.
STU:AY1 vs EVRG, CMS, PNW: Cyclically Adjusted PB Ratio Comparison
For the Utilities - Regulated Electric subindustry, Alliant Energy's Cyclically Adjusted PB Ratio, along with its competitors' market caps and Cyclically Adjusted PB 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.
Alliant Energy Cyclically Adjusted PB Ratio vs Utilities - Regulated Industry
For the Utilities - Regulated industry and Utilities sector, Alliant Energy's Cyclically Adjusted PB Ratio distribution charts can be found below:
* The bar in red indicates where Alliant Energy's Cyclically Adjusted PB Ratio falls into.
Alliant Energy Cyclically Adjusted PB Ratio Calculation
Like the Shiller PE Ratio, the Cyclically Adjusted PB Ratio takes the Book Value per Share from the past 10 years, adjusts it for inflation, and then calculates the average. This average is then used for the P/B calculation. Because it considers this 10-year average, it's often referred to as the CAPB 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 PB Ratio.
Alliant Energy's Cyclically Adjusted PB 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 PB Ratio of 2.50 mean?
Alliant Energy (STU:AY1) has a Cyclically Adjusted PB Ratio of 2.50 as of Aug. 08, 2026. Cyclically Adjusted PB Ratio is the ratio of share price to a company's inflation-adjusted book value per share over a 10-year period. View historical data on Alliant Energy and its competitors. This is near median its historical median of 2.64. Over the past decade, Alliant Energy's Cyclically Adjusted PB Ratio has ranged from 1.98 to 3.46. According to the industry distribution chart, Alliant Energy ranks #340 out of 437 companies in the Utilities - Regulated industry, placing it in the top 77.8%.
Is Alliant Energy's Cyclically Adjusted PB Ratio too high?
Alliant Energy's current Cyclically Adjusted PB Ratio of 2.50 is near median its 10-year median of 2.64. Over the past 10 years, this metric has ranged from a low of 1.98 to a high of 3.46. The Utilities - Regulated industry median Cyclically Adjusted PB Ratio is 1.52. Alliant Energy's value of 2.50 is 64.5% above this industry median. Based on the distribution chart, Alliant Energy ranks #340 out of 437 companies in the Utilities - Regulated industry, which is in the bottom quartile relative to peers. Overall, Alliant Energy has a GF Score™ of 77/100 and is considered Fairly Valued, reflecting its overall financial health beyond just this single metric.
How does Alliant Energy's Cyclically Adjusted PB Ratio compare to EVRG and CMS?
According to the Utilities - Regulated industry distribution chart, Alliant Energy ranks #340 out of 437 companies for Cyclically Adjusted PB Ratio. This places Alliant Energy in the lower half of its industry. The industry median Cyclically Adjusted PB Ratio is 1.52. Alliant Energy's value of 2.50 is 64.5% above this benchmark. Historically, Alliant Energy's own Cyclically Adjusted PB Ratio has ranged from 1.98 to 3.46 over the past decade. While the company's 10-year median is 2.64 vs. the industry median of 1.52, Alliant Energy 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 PB Ratio for an Utilities - Regulated company?
The median Cyclically Adjusted PB Ratio among Utilities - Regulated companies is 1.52, based on 437 companies in the industry. Companies in the top quartile (top 25%) have a Cyclically Adjusted PB Ratio significantly above this median, while those in the bottom quartile fall well below. However, Cyclically Adjusted PB Ratio should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Alliant Energy's current Cyclically Adjusted PB Ratio of 2.50 is 64.5% 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 PB Ratio mean?
A high Cyclically Adjusted PB Ratio can signal that a stock is expensive relative to its fundamentals. Cyclically Adjusted PB Ratio is the ratio of share price to a company's inflation-adjusted book value per share over a 10-year period. View historical data on Alliant Energy and its competitors. For the Utilities - Regulated industry, the median Cyclically Adjusted PB Ratio is 1.52 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Alliant Energy's current Cyclically Adjusted PB Ratio is 2.50, which is near median its own 10-year median of 2.64. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Alliant Energy stock overvalued right now?
Based on GuruFocus' analysis, Alliant Energy (STU:AY1) is currently considered Fairly Valued. The stock's GF Value™ is €59.00, compared to a current price of €59.96 — trading 1.6% above its estimated fair value. The current Cyclically Adjusted PB Ratio is 2.50, which is near median its 10-year median of 2.64 and 64.5% above the Utilities - Regulated industry median of 1.52. Alliant Energy's overall GF Score™ is 77/100 with 7 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Cyclically Adjusted PB Ratio calculated?
Cyclically Adjusted PB Ratio is calculated from a company's financial statements. For Alliant Energy (STU:AY1), the current Cyclically Adjusted PB Ratio is 2.50 as of Aug. 08, 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 Alliant Energy (STU:AY1) Overvalued in 2026?
Based on GuruFocus' analysis, Alliant Energy stock appears to be overvalued.
The current stock price of €59.96 is trading 1.6% above its estimated GF Value™ of €59.00.
GuruFocus considers Alliant Energy to be Fairly Valued.
Key valuation signals for STU:AY1:
Cyclically Adjusted PB Ratio: 2.50 (near median its 10-year median of 2.64)
GF Value™: €59.00 vs. price of €59.96 (1.6% above fair value)
Industry Position: 64.5% above the Utilities - Regulated median (#340 of 437)
No single metric tells the full story. See the STU:AY1 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Alliant Energy is the parent of two regulated utilities, Interstate Power and Light and Wisconsin Power and Light. Together, IPL and WPL serve nearly 1 million electric customers and 425,000 natural gas-only customers. Both subsidiaries engage in the generation and distribution of electricity and the distribution and transportation of natural gas. Alliant also owns a 16% interest in American Transmission.
77GF Score
Get the complete analysis for STU:AY1
Cyclically Adjusted PB 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
STU:AY1 has been successfully added to your 
