IDKOF (Idemitsu Kosan Co) 1-Year Sharpe Ratio: 0.92 (As of Jul. 20, 2026)

Author: Vera Yuan Vera Yuan
Vera Yuan
Vera Yuan
Director of Data and Quant Analytics at GuruFocus
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.
Reviewed by: Charlie Tian Charlie Tian
Charlie Tian
Charlie Tian
Founder & CEO of GuruFocus
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.

IDKOF Idemitsu Kosan Co Ltd IDKOF
68 GF Score
Price $7.50
GF Value $6.70
Valuation Modestly Overvalued
! 4 Warning Signs
View Full Analysis

What is Idemitsu Kosan Co 1-Year Sharpe Ratio?

Idemitsu Kosan Co IDKOF 68 1-Year Sharpe Ratio is 0.92 as of Jul. 20, 2026. GuruFocus rates IDKOF with a GF Score™ of 68/100 and a GF Value™ of $6.70 (Modestly Overvalued). The stock has 4 warning signs investors should review.

The 1-Year Sharpe Ratio measures the additional return that an investor receives per unit of increase in risk over the past year. As of today (2026-07-20), Idemitsu Kosan Co's 1-Year Sharpe Ratio is 0.92.

Idemitsu Kosan Co  (OTCPK:IDKOF) 1-Year Sharpe Ratio Explanation

The 1-Year Sharpe Ratio inidicates the risk-adjusted return of an investment over the past year. It is calculated as the annualized result of the average monthly excess return divided by its standard deviation over the past year. The monthly excess return is the monthly investment return minus the monthly risk-free rate (typically the 10-year Treasury Constant Maturity Rate). If the risk-free rate for a specific region is not available, U.S. data is used by default.

The greater a portfolio's Sharpe Ratio, the better its risk-adjusted performance. A negative Sharpe Ratio means the risk-free rate is greater than the portfolio’s historical or projected return, or else the portfolio's return is expected to be negative.

Idemitsu Kosan Co 1-Year Sharpe Ratio Related Terms

IDKOF vs VLO, MPC, PSX: 1-Year Sharpe Ratio Comparison

For the Oil & Gas Refining & Marketing subindustry, Idemitsu Kosan Co's 1-Year Sharpe Ratio, along with its competitors' market caps and 1-Year Sharpe 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.

Idemitsu Kosan Co 1-Year Sharpe Ratio vs Oil & Gas Industry

For the Oil & Gas industry and Energy sector, Idemitsu Kosan Co's 1-Year Sharpe Ratio distribution charts can be found below:

* The bar in red indicates where Idemitsu Kosan Co's 1-Year Sharpe Ratio falls into.


IDKOF
68GF Score
Idemitsu Kosan Co Ltd IDKOF
1-Year Sharpe Ratio is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Idemitsu Kosan Co 1-Year Sharpe Ratio Calculation

The 1-Year Sharpe Ratio measures the performance of an investment such as a stock or portfolio compared to a risk-free asset. A stock / portfolio's 1-Year Sharpe Ratio can be calculated by dividing the difference between the one-year returns of the investment and the risk-free rate, by the standard deviation of the investment returns over one year.

Frequently Asked Questions Learn more about 1-Year Sharpe Ratio →
What does a 1-Year Sharpe Ratio of 0.92 mean?
Idemitsu Kosan Co (IDKOF) has a 1-Year Sharpe Ratio of 0.92 as of Jul. 20, 2026. 1-Year Sharpe Ratio measures the additional return that an investor receives per unit of increase in risk. View historical data for Idemitsu Kosan Co and its competitors.
Is Idemitsu Kosan Co's 1-Year Sharpe Ratio too high?
Idemitsu Kosan Co's current 1-Year Sharpe Ratio is 0.92. Overall, Idemitsu Kosan Co has a GF Score™ of 68/100 and is considered Modestly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Idemitsu Kosan Co's 1-Year Sharpe Ratio compare to VLO and MPC?
Idemitsu Kosan Co's 1-Year Sharpe Ratio of 0.92 can be compared against companies in the Oil & Gas industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good 1-Year Sharpe Ratio for an Oil & Gas company?
A good 1-Year Sharpe Ratio depends on the Oil & Gas industry context. However, 1-Year Sharpe 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 1-Year Sharpe Ratio mean?
A high 1-Year Sharpe Ratio can signal that a stock is expensive relative to its fundamentals. 1-Year Sharpe Ratio measures the additional return that an investor receives per unit of increase in risk. View historical data for Idemitsu Kosan Co and its competitors. Idemitsu Kosan Co's current 1-Year Sharpe Ratio is 0.92. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Idemitsu Kosan Co stock overvalued right now?
Based on GuruFocus' analysis, Idemitsu Kosan Co (IDKOF) is currently considered Modestly Overvalued. The stock's GF Value™ is $6.70, compared to a current price of $7.50 — trading 11.9% above its estimated fair value. The current 1-Year Sharpe Ratio is 0.92. Idemitsu Kosan Co's overall GF Score™ is 68/100 with 4 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is 1-Year Sharpe Ratio calculated?
1-Year Sharpe Ratio is calculated from a company's financial statements. For Idemitsu Kosan Co (IDKOF), the current 1-Year Sharpe Ratio is 0.92 as of Jul. 20, 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 Idemitsu Kosan Co (IDKOF) Overvalued in 2026?

Based on GuruFocus' analysis, Idemitsu Kosan Co stock appears to be overvalued. The current stock price of $7.50 is trading 11.9% above its estimated GF Value™ of $6.70. GuruFocus considers Idemitsu Kosan Co to be Modestly Overvalued.

Key valuation signals for IDKOF:

  • 1-Year Sharpe Ratio: 0.92
  • GF Value™: $6.70 vs. price of $7.50 (11.9% above fair value)
  • GF Score™: 68/100 with 4 warning signs

No single metric tells the full story. See the IDKOF stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.

Idemitsu Kosan Co Business Description

Industry EnergyOil & Gas
Address 1-2-1 Otemachi, Chiyoda-ku, Tokyo, JPN, 100-8321
Idemitsu Kosan Co Ltd engages in a variety of activities globally that include petroleum products, oil exploration and production, coal, and other businesses. The company operates through five segments. The Basic Chemicals segment makes and sells olefins and aroma products. Electricity/Renewable Energy covers thermal, solar, and wind power generation, electricity sales, and solar business. Fuel Oil handles production, trading, and import/export of refined petroleum. The Highly Functional Materials segment includes lubricants, chemicals, electronic materials, paving materials, and agri-bio. The Resource segment explores, develops, and sells crude oil, natural gas, and coal. Others cover insurance and intra-group services. It generates the majority of its revenue from the Fuel oil segment.
68GF Score

Get the complete analysis for IDKOF

1-Year Sharpe Ratio is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

$7.50
Price
$6.70
GF Value