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AltaGasATGFF +1.75%69 Cyclically Adjusted PB Ratio is 2.09 as of Aug. 03, 2026, which is 73% above its 10-year median of 1.21. GuruFocus rates ATGFF with a GF Score™ of 69/100 and a GF Value™ of $25.60 (Significantly Overvalued). The stock has 13 warning signs investors should review. Among 765 Oil & Gas companies, AltaGas ranks worse than 69.8% on this metric.
As of today (2026-08-03), AltaGas's current share price is $40.08. AltaGas's Cyclically Adjusted Book per Share for the quarter that ended in Jun. 2026 was $19.17. AltaGas's Cyclically Adjusted PB Ratio for today is 2.09.
The historical rank and industry rank for AltaGas's Cyclically Adjusted PB Ratio or its related term are showing as below:
ATGFF'
s Cyclically Adjusted PB Ratio Range Over the Past 10 Years
Min: 0.6 Med: 1.21 Max: 2.19
Current: 2.05
During the past years, AltaGas's highest Cyclically Adjusted PB Ratio was 2.19. The lowest was 0.60. And the median was 1.21.
ATGFF's Cyclically Adjusted PB Ratio is ranked worse than 69.8% of 765
companies
in the Oil & Gas industry
Industry Median: 1.21
vs ATGFF: 2.05
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.
AltaGas's adjusted book value per share data for the three months ended in Jun. 2026 was $21.352. 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 $19.17 for the trailing ten years ended in Jun. 2026.
Shiller PE for Stocks: The True Measure of Stock Valuation
AltaGas (OTCPK:ATGFF) 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.
AltaGas Cyclically Adjusted PB Ratio Related Terms
AltaGas Cyclically Adjusted PB Ratio Historical Data
* Premium members only.
The historical data trend for AltaGas'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.
ATGFF vs WMB, EPD, KMI: Cyclically Adjusted PB Ratio Comparison
For the Oil & Gas Midstream subindustry, AltaGas'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.
AltaGas Cyclically Adjusted PB Ratio vs Oil & Gas Industry
For the Oil & Gas industry and Energy sector, AltaGas's Cyclically Adjusted PB Ratio distribution charts can be found below:
* The bar in red indicates where AltaGas's Cyclically Adjusted PB Ratio falls into.
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.
AltaGas'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 2.09 mean?
AltaGas (ATGFF) has a Cyclically Adjusted PB Ratio of 2.09 as of Aug. 03, 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 AltaGas and its competitors. This is 73% above median its historical median of 1.21. Over the past decade, AltaGas' Cyclically Adjusted PB Ratio has ranged from 0.60 to 2.19. According to the industry distribution chart, AltaGas ranks #534 out of 765 companies in the Oil & Gas industry, placing it in the top 69.8%.
Is AltaGas' Cyclically Adjusted PB Ratio too high?
AltaGas' current Cyclically Adjusted PB Ratio of 2.09 is 73% above median its 10-year median of 1.21. Over the past 10 years, this metric has ranged from a low of 0.60 to a high of 2.19. The Oil & Gas industry median Cyclically Adjusted PB Ratio is 1.21. AltaGas' value of 2.09 is 72.7% above this industry median. Based on the distribution chart, AltaGas ranks #534 out of 765 companies in the Oil & Gas industry, which is below the industry midpoint. Overall, AltaGas has a GF Score™ of 69/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does AltaGas' Cyclically Adjusted PB Ratio compare to WMB and EPD?
According to the Oil & Gas industry distribution chart, AltaGas ranks #534 out of 765 companies for Cyclically Adjusted PB Ratio. This places AltaGas in the lower half of its industry. The industry median Cyclically Adjusted PB Ratio is 1.21. AltaGas' value of 2.09 is 72.7% above this benchmark. Historically, AltaGas' own Cyclically Adjusted PB Ratio has ranged from 0.60 to 2.19 over the past decade. While the company's 10-year median is 1.21 vs. the industry median of 1.21, AltaGas 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 Oil & Gas company?
The median Cyclically Adjusted PB Ratio among Oil & Gas companies is 1.21, based on 765 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. AltaGas's current Cyclically Adjusted PB Ratio of 2.09 is 72.7% 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 AltaGas and its competitors. For the Oil & Gas industry, the median Cyclically Adjusted PB Ratio is 1.21 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. AltaGas's current Cyclically Adjusted PB Ratio is 2.09, which is 73% above median its own 10-year median of 1.21. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is AltaGas stock overvalued right now?
Based on GuruFocus' analysis, AltaGas (ATGFF) is currently considered Significantly Overvalued. The stock's GF Value™ is $25.60, compared to a current price of $40.08 — trading 56.6% above its estimated fair value. The current Cyclically Adjusted PB Ratio is 2.09, which is 73% above median its 10-year median of 1.21 and 72.7% above the Oil & Gas industry median of 1.21. AltaGas' overall GF Score™ is 69/100 with 13 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 AltaGas (ATGFF), the current Cyclically Adjusted PB Ratio is 2.09 as of Aug. 03, 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 AltaGas (ATGFF) Overvalued in 2026?
Based on GuruFocus' analysis, AltaGas stock appears to be overvalued.
The current stock price of $40.08 is trading 56.6% above its estimated GF Value™ of $25.60.
GuruFocus considers AltaGas to be Significantly Overvalued.
Key valuation signals for ATGFF:
Cyclically Adjusted PB Ratio: 2.09 (73% above median its 10-year median of 1.21)
GF Value™: $25.60 vs. price of $40.08 (56.6% above fair value)
Industry Position: 72.7% above the Oil & Gas median (#534 of 765)
No single metric tells the full story. See the ATGFF stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
AltaGas Ltd is a North American energy infrastructure company that connects customers and markets to energy sources. AltaGas has three reporting segments: Utilities, Midstream, and Corporate/Other. The majority of its revenue is generated from the Midstream segment, which operates a North American energy platform that moves natural gas and LPGs from the wellhead to markets. It exports propane and butane to Asia through its LPG terminals, and runs natural gas gathering, processing, fractionation, liquids handling, and storage infrastructure. The segment also includes its natural gas and natural gas liquids (NGLs) marketing business, domestic logistics, trucking and rail terminals, and liquid and natural gas storage capability. Geographically, the firm derives its key revenue from the U.S.
69GF Score
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Cyclically Adjusted PB Ratio is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.
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