Graham Number is a figure that measures a stock's fundamental value by taking into account the company's earnings per share and book value per share. The Graham number is the upper bound of the price range that a defensive investor should pay for the stock. According to the theory, any stock price below the Graham number is considered undervalued, and thus worth investing in.
The historical rank and industry rank for Interconexion Electrica ESP's Graham Number or its related term are showing as below:
During the past 13 years, the highest Price to Graham Number ratio of Interconexion Electrica ESP was 2.03. The lowest was 0.83. And the median was 1.40.
BOG:ISA's Price-to-Graham-Number is not ranked *
in the Utilities - Regulated industry.
Industry Median: 1.11 * Ranked among companies with meaningful Price-to-Graham-Number only.
Graham Number is a combination of asset valuation and earnings power valuation. It is a very conservative way of valuing a stock.
Interconexion Electrica ESP (BOG:ISA) Graham Number Explanation
Ben Graham actually did not publish a formula like this. But he wrote in The Intelligent Investor (1948 version) regarding to the criteria for purchases:
Current price should not be more than 15 times average earnings of the past three years.
Current price should not be more than 1.5 times the book value last reported. However, a multiplier of earnings below 15 could justify a correspondingly higher multiplier of assets. As a rule of thumb we suggest that the product of the multiplier times the ratio of price to book value should not exceed 22.5. (This figure corresponds to 15 times earnings and 1.5 times book value. It would admit an issue selling at only 9 times earnings and 2.5 times asset value, etc.)
Unlike valuation methods such as DCF or Discounted Earnings, the Graham number does not take growth into the valuation. Unlike the valuation methods based on book value alone, it takes into account the earnings power. Therefore, the Graham Number is a combination of asset valuation and earnings power valuation.
In general, the Graham number is a very conservative way of valuing a stock. It cannot be applied to companies with negative book values.
Interconexion Electrica ESP's Price to Graham number Ratio for today is calculated as
Price to Graham number
=
Share Price (Today)
/
Graham number (Q: Mar. 2026 )
=
30700.00
/
N/A
=
N/A
* 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.
Be Aware
Please keep these in mind:
1. Graham Number does not take growth into account. Therefore it underestimates the values of the companies that have good earnings growth. We feel that if the earnings per share grows more than 10% a year, Graham Number underestimates the value.
2. Graham Number punishes the companies that have temporarily low earnings. Therefore, an average of earnings makes more sense in the calculation of Graham Number.
3. Graham Numbers underestimates companies that are light with book.
Interconexion Electrica ESP Graham Number Related Terms
Interconexion Electrica ESP Graham Number Historical Data
* 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.
For the Utilities - Regulated Electric subindustry, Interconexion Electrica ESP's Price-to-Graham-Number, along with its competitors' market caps and Price-to-Graham-Number 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.
Interconexion Electrica ESP Price-to-Graham-Number vs Utilities - Regulated Industry
For the Utilities - Regulated industry and Utilities sector, Interconexion Electrica ESP's Price-to-Graham-Number distribution charts can be found below:
* The bar in red indicates where Interconexion Electrica ESP's Price-to-Graham-Number falls into.
* 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.
Interconexion Electrica ESP (BOG:ISA) has a Graham Number of COPN/A as of Mar. 2026. The Graham Number values a company based on its per-share earnings and book value. View historical data on Interconexion Electrica ESP and its competitors. Over the past decade, Interconexion Electrica ESP's Graham Number has ranged from 0.83 to 2.03. According to the industry distribution chart, Interconexion Electrica ESP ranks #999999 out of 416 companies in the Utilities - Regulated industry.
Is Interconexion Electrica ESP's Graham Number too high?
Interconexion Electrica ESP's current Graham Number is COPN/A. Over the past 10 years, this metric has ranged from a low of 0.83 to a high of 2.03. Based on the distribution chart, Interconexion Electrica ESP ranks #999999 out of 416 companies in the Utilities - Regulated industry, which is in the bottom quartile relative to peers. Overall, Interconexion Electrica ESP has a GF Score™ of 88/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Interconexion Electrica ESP's Graham Number compare to NEE and SO?
According to the Utilities - Regulated industry distribution chart, Interconexion Electrica ESP ranks #999999 out of 416 companies for Graham Number. This places Interconexion Electrica ESP in the lower half of its industry. The industry median Graham Number is 1.11. Historically, Interconexion Electrica ESP's own Graham Number has ranged from 0.83 to 2.03 over the past decade. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Graham Number for an Utilities - Regulated company?
The median Graham Number among Utilities - Regulated companies is 1.11, based on 416 companies in the industry. Companies in the top quartile (top 25%) have a Graham Number significantly above this median, while those in the bottom quartile fall well below. However, Graham Number should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Graham Number mean?
A high Graham Number can signal that a stock is expensive relative to its fundamentals. The Graham Number values a company based on its per-share earnings and book value. View historical data on Interconexion Electrica ESP and its competitors. For the Utilities - Regulated industry, the median Graham Number is 1.11 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Interconexion Electrica ESP's current Graham Number is COPN/A. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Interconexion Electrica ESP stock overvalued right now?
Based on GuruFocus' analysis, Interconexion Electrica ESP (BOG:ISA) is currently considered Significantly Overvalued. The stock's GF Value™ is COP20,609.01, compared to a current price of COP30,700.00 — trading 49% above its estimated fair value. The current Graham Number is COPN/A. Interconexion Electrica ESP's overall GF Score™ is 88/100 with 12 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Graham Number calculated?
Graham Number is calculated from a company's financial statements. For Interconexion Electrica ESP (BOG:ISA), the current Graham Number is COPN/A as of Mar. 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 Interconexion Electrica ESP (BOG:ISA) Overvalued in 2026?
Based on GuruFocus' analysis, Interconexion Electrica ESP stock appears to be overvalued.
The current stock price of COP30,700.00 is trading 49% above its estimated GF Value™ of COP20,609.01.
GuruFocus considers Interconexion Electrica ESP to be Significantly Overvalued.
Key valuation signals for BOG:ISA:
Graham Number: COPN/A
GF Value™: COP20,609.01 vs. price of COP30,700.00 (49% above fair value)
No single metric tells the full story. See the BOG:ISA stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Interconexion Electrica SA ESP, also known as ISA, is a mixed public services company in which the Colombian state is a majority shareholder. Through its subsidiaries, ISA participates in a variety of infrastructure projects across South and Central America. The company segments its operations into Electric Power Transmission, Roads, Telecommunications and ICT. The company generates the majority of its revenue from its Energy Transmission division where it owns, operates, and maintains high-voltage power transmission systems.
88GF Score
Get the complete analysis for BOG:ISA
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