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.
PTC TherapeuticsPTCT -2.40%51 3-Year Share Buyback Ratio is -3.70 as of Jun. 2026. GuruFocus rates PTCT with a GF Score™ of 51/100 and a GF Value™ of $38.04 (Significantly Overvalued). The stock has 7 warning signs investors should review. Among 1,191 Biotechnology companies, PTC Therapeutics ranks better than 70.03% on this metric.
Shares Outstanding (EOP) are shares that have been authorized, issued, and purchased by investors and are held by them.
3-Year Share Buyback Ratio measures the average annual proportion of a company's outstanding shares repurchased over the past three years. It is calculated as the annualized percentage change in shares outstanding from three years ago to the current year. A positive ratio may indicate share buybacks over the period, while a zero or negative ratio may reflect no repurchases or potential share issuance. PTC Therapeutics's current 3-Year Share Buyback Ratio was -3.70%.
The historical rank and industry rank for PTC Therapeutics's 3-Year Share Buyback Ratio or its related term are showing as below:
PTCT'
s 3-Year Share Buyback Ratio Range Over the Past 10 Years
Min: -21.9 Med: -11.75 Max: -2.8
Current: -3.7
During the past 13 years, PTC Therapeutics's highest 3-Year Share Buyback Ratio was -2.80%. The lowest was -21.90%. And the median was -11.75%.
PTCT's 3-Year Share Buyback Ratio is ranked better than 70.03% of 1191
companies
in the Biotechnology industry
Industry Median: -11.8
vs PTCT: -3.70
PTC Therapeutics (NAS:PTCT) 3-Year Share Buyback Ratio Explanation
A negative number means the company might be issuing new shares. A positive number indicates that the company is buying back shares.
Be Aware
Investors usually like share buybacks. But as pointed by Warren Buffett, only if a company buys back shares at the prices below the stock's intrinsic value, it rewards remaining shareholders. If a company buys its overvalued stocks back, it destroys shareholder value.
PTC Therapeutics 3-Year Share Buyback Ratio Related Terms
PTCT vs XENE, CGON, ERAS: 3-Year Share Buyback Ratio Comparison
For the Biotechnology subindustry, PTC Therapeutics's 3-Year Share Buyback Ratio, along with its competitors' market caps and 3-Year Share Buyback 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.
PTC Therapeutics 3-Year Share Buyback Ratio vs Biotechnology Industry
For the Biotechnology industry and Healthcare sector, PTC Therapeutics's 3-Year Share Buyback Ratio distribution charts can be found below:
* The bar in red indicates where PTC Therapeutics's 3-Year Share Buyback Ratio falls into.
PTC Therapeutics 3-Year Share Buyback Ratio Calculation
This is the annualized percentage change in shares outstanding from three years ago to the current year. The annualized percentage change is calculated with expontential compound based on the latest four years of annual data on Shares Outstanding (EOP).
Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the average dividends per share growth rate.
What does a 3-Year Share Buyback Ratio of -3.70 mean?
PTC Therapeutics (PTCT) has a 3-Year Share Buyback Ratio of -3.70 as of Jun. 2026. The 3-Year Share Buyback Ratio measures the average annual proportion of a company's outstanding shares repurchased over the past three years. It is calculated as the annualized percentage change in shares outstanding from three years ago to the current year. View historical data for PTC Therapeutics and its competitors. According to the industry distribution chart, PTC Therapeutics ranks #357 out of 1191 companies in the Biotechnology industry, placing it in the top 30%.
Is PTC Therapeutics' 3-Year Share Buyback Ratio too high?
PTC Therapeutics' current 3-Year Share Buyback Ratio is -3.70. Based on the distribution chart, PTC Therapeutics ranks #357 out of 1191 companies in the Biotechnology industry, which is above the industry midpoint. Overall, PTC Therapeutics has a GF Score™ of 51/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does PTC Therapeutics' 3-Year Share Buyback Ratio compare to XENE and CGON?
According to the Biotechnology industry distribution chart, PTC Therapeutics ranks #357 out of 1191 companies for 3-Year Share Buyback Ratio. This puts PTC Therapeutics in the upper half of its industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good 3-Year Share Buyback Ratio for a Biotechnology company?
A good 3-Year Share Buyback Ratio depends on the Biotechnology industry context. However, 3-Year Share Buyback Ratio 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 3-Year Share Buyback Ratio mean?
A high 3-Year Share Buyback Ratio can signal that a stock is expensive relative to its fundamentals. The 3-Year Share Buyback Ratio measures the average annual proportion of a company's outstanding shares repurchased over the past three years. It is calculated as the annualized percentage change in shares outstanding from three years ago to the current year. View historical data for PTC Therapeutics and its competitors. PTC Therapeutics's current 3-Year Share Buyback Ratio is -3.70. 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 $38.04, compared to a current price of $70.07 — trading 84.2% above its estimated fair value. The current 3-Year Share Buyback Ratio is -3.70. PTC Therapeutics' overall GF Score™ is 51/100 with 7 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is 3-Year Share Buyback Ratio calculated?
3-Year Share Buyback Ratio is calculated from a company's financial statements. For PTC Therapeutics (PTCT), the current 3-Year Share Buyback Ratio is -3.70 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 $70.07 is trading 84.2% above its estimated GF Value™ of $38.04.
GuruFocus considers PTC Therapeutics to be Significantly Overvalued.
Key valuation signals for PTCT:
3-Year Share Buyback Ratio: -3.70
GF Value™: $38.04 vs. price of $70.07 (84.2% 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.
51GF Score
Get the complete analysis for PTCT
3-Year Share Buyback 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
PTCT has been successfully added to your 
