SUMCOSUMCF +4.76%65 PB Ratio is 2.39 as of Jun. 27, 2026, which is 66% above its 10-year median of 1.44. GuruFocus rates SUMCF with a GF Score™ of 65/100 and a GF Value™ of $11.50 (Significantly Overvalued). The stock has 7 warning signs investors should review. Among 1,000 Semiconductors companies, SUMCO ranks better than 67.1% on this metric.
The PB Ratio, or Price-to-Book ratio, or Price/Book, is a financial ratio used to compare a company's market price to its Book Value per Share. As of today (2026-06-27), SUMCO's share price is $24.54. SUMCO's Book Value per Share for the quarter that ended in Dec. 2025 was $10.26. Hence, SUMCO's PB Ratio of today is 2.39.
Warning Sign:
SUMCO Corp stock PB Ratio (=2.35) is close to 5-year high of 2.57.
The historical rank and industry rank for SUMCO's PB Ratio or its related term are showing as below:
SUMCF'
s PB Ratio Range Over the Past 10 Years
Min: 0.52 Med: 1.44 Max: 3.95
Current: 2.35
During the past 13 years, SUMCO's highest PB Ratio was 3.95. The lowest was 0.52. And the median was 1.44.
SUMCF's PB Ratio is ranked better than 67.1% of 1000
companies
in the Semiconductors industry
Industry Median: 3.765
vs SUMCF: 2.35
During the past 12 months, SUMCO's average Book Value Per Share Growth Rate was -2.30% per year.
During the past 3 years, the average Book Value Per Share Growth Rate was 2.80% per year.
During the past 5 years, the average Book Value Per Share Growth Rate was 8.50% per year.
During the past 10 years, the average Book Value Per Share Growth Rate was 10.40% per year.
During the past 13 years, the highest 3-Year average Book Value Per Share Growth Rate of SUMCO was 61.30% per year. The lowest was -33.10% per year. And the median was 8.60% per year.
The PB Ratio works the best for the businesses that earn most of their profit from their assets, e.g. banks and insurance companies.
Be Aware
Some businesses have very light assets, such as software companies or insurance agencies. The PB Ratio does not work well for these companies. Some companies even have negative equity, so the PB Ratio cannot be applied to them.
SUMCO PB Ratio Related Terms
SUMCO PB Ratio Historical Data
* Premium members only.
The historical data trend for SUMCO's 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.
For the Semiconductor Equipment & Materials subindustry, SUMCO's PB Ratio, along with its competitors' market caps and 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.
SUMCO PB Ratio vs Semiconductors Industry
For the Semiconductors industry and Technology sector, SUMCO's PB Ratio distribution charts can be found below:
* The bar in red indicates where SUMCO's PB Ratio falls into.
The PB Ratio, or Price-to-Book ratio, or Price/Book, is a financial ratio used to compare a company's market price to its Book Value per Share. It is a ratio widely used to value stocks.
SUMCO's PB Ratio for today is calculated as follows:
* 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.
It can also be calculated from the numbers for the whole company:
A closely related ratio is called Price-to-Tangible-Book. The difference between Price-to-Tangible-Book and PB Ratio is that book value other than intangibles are used in the calculation.
SUMCO (SUMCF) has a PB Ratio of 2.39 as of Jun. 27, 2026. Price-to-Book ratio is the ratio of share price to a company's book value per share. View historical data on SUMCO and its competitors. This is 66% above median its historical median of 1.44. Over the past decade, SUMCO's PB Ratio has ranged from 0.52 to 3.95. According to the industry distribution chart, SUMCO ranks #329 out of 1000 companies in the Semiconductors industry, placing it in the top 32.9%.
Is SUMCO's PB Ratio too high?
SUMCO's current PB Ratio of 2.39 is 66% above median its 10-year median of 1.44. Over the past 10 years, this metric has ranged from a low of 0.52 to a high of 3.95. The Semiconductors industry median PB Ratio is 3.77. SUMCO's value of 2.39 is 36.5% below this industry median. Based on the distribution chart, SUMCO ranks #329 out of 1000 companies in the Semiconductors industry, which is above the industry midpoint. Overall, SUMCO has a GF Score™ of 65/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does SUMCO's PB Ratio compare to LRCX and AMAT?
According to the Semiconductors industry distribution chart, SUMCO ranks #329 out of 1000 companies for PB Ratio. This puts SUMCO in the upper half of its industry. The industry median PB Ratio is 3.77. SUMCO's value of 2.39 is 36.5% below this benchmark. Historically, SUMCO's own PB Ratio has ranged from 0.52 to 3.95 over the past decade. While the company's 10-year median is 1.44 vs. the industry median of 3.77, SUMCO has consistently been below 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 PB Ratio for a Semiconductors company?
The median PB Ratio among Semiconductors companies is 3.77, based on 1,000 companies in the industry. Companies in the top quartile (top 25%) have a PB Ratio significantly above this median, while those in the bottom quartile fall well below. However, PB Ratio should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. SUMCO's current PB Ratio of 2.39 is 36.5% below 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 PB Ratio mean?
A high PB Ratio can signal that a stock is expensive relative to its fundamentals. Price-to-Book ratio is the ratio of share price to a company's book value per share. View historical data on SUMCO and its competitors. For the Semiconductors industry, the median PB Ratio is 3.77 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. SUMCO's current PB Ratio is 2.39, which is 66% above median its own 10-year median of 1.44. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is SUMCO stock overvalued right now?
Based on GuruFocus' analysis, SUMCO (SUMCF) is currently considered Significantly Overvalued. The stock's GF Value™ is $11.50, compared to a current price of $24.54 — trading 113.4% above its estimated fair value. The current PB Ratio is 2.39, which is 66% above median its 10-year median of 1.44 and 36.5% below the Semiconductors industry median of 3.77. SUMCO's overall GF Score™ is 65/100 with 7 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is PB Ratio calculated?
PB Ratio is calculated from a company's financial statements. For SUMCO (SUMCF), the current PB Ratio is 2.39 as of Jun. 27, 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 SUMCO (SUMCF) Overvalued in 2026?
Based on GuruFocus' analysis, SUMCO stock appears to be overvalued.
The current stock price of $24.54 is trading 113.4% above its estimated GF Value™ of $11.50.
GuruFocus considers SUMCO to be Significantly Overvalued.
Key valuation signals for SUMCF:
PB Ratio: 2.39 (66% above median its 10-year median of 1.44)
GF Value™: $11.50 vs. price of $24.54 (113.4% above fair value)
Industry Position: 36.5% below the Semiconductors median (#329 of 1000)
No single metric tells the full story. See the SUMCF stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Founded in 1999 as a joint venture between Nippon Steel and two Mitsubishi entities, Sumco is the world's second-largest semiconductor-grade silicon wafer manufacturer, with an estimated 21% market share in 2025. Sumco is headquartered in Tokyo and operates seven production sites across Japan. It also maintains sales and support offices in Taiwan, the US, the UK, Indonesia, and Singapore. Sumco sells to most semiconductor manufacturers like TSMC, Intel, Samsung, and Micron. The firm employs over 9,700 people.
65GF Score
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