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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.
As of today (2026-08-08), the stock price of Porta Communications is £0.00. Porta Communications's graham number for the quarter that ended in Dec. 2018 was £N/A. Therefore, Porta Communications's Price to Graham Number ratio for today is N/A.
The historical rank and industry rank for Porta Communications's Graham Number or its related term are showing as below:
LSE:PTCM's Price-to-Graham-Number is not ranked *
in the Media - Diversified industry.
Industry Median: 1.19 * 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.
Porta Communications (LSE:PTCM) 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.
Porta Communications's Price to Graham number Ratio for today is calculated as
Price to Graham number
=
Share Price (Today)
/
Graham number (Q: Dec. 2018 )
=
0.00
/
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.
Porta Communications Graham Number Related Terms
Porta Communications Graham Number Historical Data
* Premium members only.
The historical data trend for Porta Communications's Graham Number 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.
For the Advertising Agencies subindustry, Porta Communications'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.
Porta Communications Price-to-Graham-Number vs Media - Diversified Industry
For the Media - Diversified industry and Communication Services sector, Porta Communications's Price-to-Graham-Number distribution charts can be found below:
* The bar in red indicates where Porta Communications'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.
Porta Communications (LSE:PTCM) has a Graham Number of £N/A as of Dec. 2018. The Graham Number values a company based on its per-share earnings and book value. View historical data on Porta Communications and its competitors.
Is Porta Communications' Graham Number too high?
Porta Communications' current Graham Number is £N/A.
How does Porta Communications' Graham Number compare to NWCN and ADMG?
Porta Communications' Graham Number of £N/A can be compared against companies in the Media - Diversified industry. The industry median Graham Number is 1.19. 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 a Media - Diversified company?
The median Graham Number among Media - Diversified companies is 1.19, based on 497 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 Porta Communications and its competitors. For the Media - Diversified industry, the median Graham Number is 1.19 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Porta Communications's current Graham Number is £N/A. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Porta Communications stock overvalued right now?
Porta Communications (LSE:PTCM) has a current Graham Number of £N/A. The current Graham Number is £N/A. 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 Porta Communications (LSE:PTCM), the current Graham Number is £N/A as of Dec. 2018. 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.
Porta Communications PLC is communications, marketing, design, advertising and analytical service provider. The company engages its business through three segments: Corporate Communications, Marketing and Advertising, and Head Office. Its operating segments include Corporate Communications and Marketing and Advertising through which it offers public relations, public affairs, media buying, advertising, marketing and corporate branding services. Its Head Office segment offers group treasury, and finance and management services. The majority of the company revenues are generated through the Corporate Communications segment mainly from the Europe and Asia-Pacific region.
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