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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 (2026-08-12), the stock price of PTC Therapeutics is $72.64. PTC Therapeutics's graham number for the quarter that ended in Jun. 2026 was $N/A. Therefore, PTC Therapeutics's Price to Graham Number ratio for today is N/A.
The historical rank and industry rank for PTC Therapeutics's Graham Number or its related term are showing as below:
PTCT's Price-to-Graham-Number is not ranked *
in the Biotechnology industry.
Industry Median: 1.845 * 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.
PTC Therapeutics (NAS:PTCT) 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.
PTC Therapeutics's Price to Graham number Ratio for today is calculated as
Price to Graham number
=
Share Price (Today)
/
Graham number (Q: Jun. 2026 )
=
72.64
/
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.
PTC Therapeutics Graham Number Related Terms
PTC Therapeutics Graham Number Historical Data
* Premium members only.
The historical data trend for PTC Therapeutics'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.
PTCT vs XENE, CGON, ERAS: Graham Number Comparison
For the Biotechnology subindustry, PTC Therapeutics'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.
PTC Therapeutics Price-to-Graham-Number vs Biotechnology Industry
For the Biotechnology industry and Healthcare sector, PTC Therapeutics's Price-to-Graham-Number distribution charts can be found below:
* The bar in red indicates where PTC Therapeutics'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.
PTC Therapeutics (PTCT) has a Graham Number of $N/A as of Jun. 2026. The Graham Number values a company based on its per-share earnings and book value. View historical data on PTC Therapeutics and its competitors. According to the industry distribution chart, PTC Therapeutics ranks #999999 out of 256 companies in the Biotechnology industry.
Is PTC Therapeutics' Graham Number too high?
PTC Therapeutics' current Graham Number is $N/A. Based on the distribution chart, PTC Therapeutics ranks #999999 out of 256 companies in the Biotechnology industry, which is in the bottom quartile relative to peers. Overall, PTC Therapeutics has a GF Score™ of 62/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does PTC Therapeutics' Graham Number compare to XENE and CGON?
According to the Biotechnology industry distribution chart, PTC Therapeutics ranks #999999 out of 256 companies for Graham Number. This places PTC Therapeutics in the lower half of its industry. The industry median Graham Number is 1.85. 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 Biotechnology company?
The median Graham Number among Biotechnology companies is 1.85, based on 256 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 PTC Therapeutics and its competitors. For the Biotechnology industry, the median Graham Number is 1.85 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. PTC Therapeutics'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 PTC Therapeutics stock overvalued right now?
Based on GuruFocus' analysis, PTC Therapeutics (PTCT) is currently considered Significantly Overvalued. The stock's GF Value™ is $37.54, compared to a current price of $72.64 — trading 93.5% above its estimated fair value. The current Graham Number is $N/A. PTC Therapeutics' overall GF Score™ is 62/100 with 7 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 PTC Therapeutics (PTCT), the current Graham Number is $N/A as of Jun. 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 PTC Therapeutics (PTCT) Overvalued in 2026?
Based on GuruFocus' analysis, PTC Therapeutics stock appears to be overvalued.
The current stock price of $72.64 is trading 93.5% above its estimated GF Value™ of $37.54.
GuruFocus considers PTC Therapeutics to be Significantly Overvalued.
Key valuation signals for PTCT:
Graham Number: $N/A
GF Value™: $37.54 vs. price of $72.64 (93.5% above fair value)
No single metric tells the full story. See the PTCT stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
PTC Therapeutics Inc is a biopharmaceutical company that discovers, develops and commercializes clinically differentiated medicines that provide benefits to children and adults living with rare disorders. Its diversified therapeutic portfolio that includes several commercial products and product candidates in various stages of development, including discovery, research and clinical stages, focused on the development of new treatments for multiple therapeutic areas for rare diseases relating to neurology and metabolism. The company views its operations and manages its business in one operating segment: life science, which is focused on the discovery, development and commercialization of the company's clinically differentiated medicines that provide benefits to patients with rare disorders.
62GF Score
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