Idemitsu Kosan Co.Ltd (IDKOF) fair value: what the stock is really worth
As of Sep 25, 2026: fair value of Idemitsu Kosan Co.Ltd $12.68, price $10.59, upside +19.7%, quality 49 out of 100. Calculated from audited financials with 26 valuation models and 37 quality factors, updated daily.
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Price vs Fair Value
White line = price, green steps = our fair value per fiscal year, dashed = 300-day average. As of Sep 28, 2026.
How to read this chart
60‑month range $3.38 – $10.59 · fair‑value band $9.51 – $15.85 · the $10.59 price screens below the $12.68 fair value. Green steps = our fair value per fiscal year (point-in-time, no hindsight). Dashed = 300-day average. As of Sep 28, 2026.
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Idemitsu Kosan Co.,Ltd. engages in the fuel oil, basic chemicals, functional materials, power and renewable energy, and resources businesses in Japan, Singapore, Asia, Oceania, North America, and internationally.
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Idemitsu Kosan Co.,Ltd. engages in the fuel oil, basic chemicals, functional materials, power and renewable energy, and resources businesses in Japan, Singapore, Asia, Oceania, North America, and internationally. The Fuel Oil segment engages in the production, sale, import, export, and trading in petroleum refined products comprising sustainable aviation fuel, synthetic fuel, biofuels, and carbon offset fuel; and operation of service stations that provide refueling, car wash, vehicle inspection, and maintenance services. Its Basic Chemicals segment produces and sells olefin and aromatic products, which include ethylene, propylene, linealene/alpha olefin, paraxylene, cyclohexane, and styrene monomer. The Functional Materials segment offers lubricants, functional chemicals, electronic materials, and bitumen/functional paving materials, as well as agri-bio products, pesticides and functional feed products. Its Renewable Energy segment engages in power generation from thermal, solar, and wind power; sale of electricity; and solar business. The Resources segment is involved in the exploration, development, production, and sale of crude oil, natural gas, and coal; and geothermal power generation. It is also involved in insurance businesses. Idemitsu Kosan Co.,Ltd. was founded in 1911 and is headquartered in Chiyoda, Japan.
Stock analysis
Idemitsu Kosan Co.Ltd (IDKOF) currently trades at $10.59, while our model-based Fair Value estimate is $12.68, implying the stock looks roughly 16.5% undervalued today.
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Valuation
Bull case: the Growth DCF group reads highest at a median of $15.67 per share, and 15 of the 24 models we run sit above the $10.59 price.
Bear case: the Economic Profit group reads lowest at $4.70, and 9 of the 24 models stay below the price. Evidence for this calculation is high.
Scenario range: $9.51 (bear) to $15.85 (bull), the price of $10.59 sits inside it. Bear and bull are the same models on cautious and optimistic assumptions, a range, not a price target.
Quality & growth
The Quality Score stands at 49/100 (below-average quality), in the Energy sector.
Mixed Growth: Revenue is growing, but margins or cash flow do not fully confirm the trend.
Idemitsu Kosan Co.Ltd reported revenue of ¥8.1T in FY2026 versus ¥6.7T in FY2022, a compound +4.9%/yr. Reported net income was ¥172B in FY2026, compounding −11.4%/yr from FY2022.
Key figures
Market cap $12.9B · P/E ratio 12.0 · P/S ratio 0.26 · EPS (TTM) $0.8800 · Dividend yield 2.6% · Net margin 2.1% · Return on equity 2.1% · Return on assets (EBIT) 5.9%.
Competitive moat
Our AI-assisted moat analysis scores the competitive advantage at 32 out of 100 (medium confidence).
What moves the price
The share trades at its 52-week high and 61% above its 52-week low, currently above its 200-day average.
For context, the median of 10 Energy peers we cover trades at −66% fair-value upside, at 20%, IDKOF screens cheaper than that median.
Fair Value models
Bear $9.51Fair Value $12.68Bull $15.85
Model ⓘEach model values the company its own way (discounted cash flow, earnings, assets, dividends). The fair value above is their evidence-weighted blend, not the output of a single model.Bear ⓘBear = the cautious scenario: the same model computed with conservative anchors (lower growth, margins and valuation multiples). Together with Bull it frames a plausible valuation range, not a price target.BaseBull ⓘBull = the optimistic scenario: the same model computed with favourable anchors (higher growth, margins and valuation multiples). Together with Bear it frames a plausible valuation range, not a price target. If a model's bull case is above four times its base value, the table shows that limit with a > sign (like the overall Bull above): beyond it no assumption holds.Evidence ⓘEvidence = how well-backed THIS model's estimate is for this stock (0–100): how complete and reliable its input data are, and how well the model fits the company. The final Fair Value is an evidence-weighted blend, so better-evidenced models count more. Green ≥70, amber 50–69, grey below 50.
Growth Quality ⓘGrowth is valuable only when reinvestment earns attractive returns (Aswath Damodaran): sustainable growth depends on return on capital, reinvestment and efficiency. Basis: total company revenue over the periods shown on the cards (3Y/5Y/all years), not per share, so a merger can show up as a growth jump; per-share earnings growth is in the value-creation card.73/100
Revenue is growing, but margins or cash flow do not fully confirm the trend.
Revenue growth 3 years ⓘMeasures the company's TOTAL revenue from reported annual statements: compound average growth per year (CAGR) from the fiscal year 3, 5 or N years back to the most recent comparable fiscal year. Not per share: buybacks do not change this number, and a merger can appear as a growth jump. Per-share growth (which does include buybacks) is in the value-creation card.
+11.2%
Revenue growth 5 years ⓘMeasures the company's TOTAL revenue from reported annual statements: compound average growth per year (CAGR) from the fiscal year 3, 5 or N years back to the most recent comparable fiscal year. Not per share: buybacks do not change this number, and a merger can appear as a growth jump. Per-share growth (which does include buybacks) is in the value-creation card.
+8.7%
Start year 2020 (pandemic). Over 10 years: +9.7% a year
Revenue growth 11 years ⓘMeasures the company's TOTAL revenue from reported annual statements: compound average growth per year (CAGR) from the fiscal year 3, 5 or N years back to the most recent comparable fiscal year. Not per share: buybacks do not change this number, and a merger can appear as a growth jump. Per-share growth (which does include buybacks) is in the value-creation card.
+5.6%
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What shareholders gained per year (last 5 years), in JPY ⓘWhat the business itself delivers per year: earnings growth per share plus the dividend yield. This is what you get IF the market keeps valuing the stock the same way: it contains no assumption about the market changing its mind. Computed per share, so buybacks count and a merger does not pass as growth. For a company that pays no dividend it is pure earnings growth per share. Period: earnings growth per share as CAGR over the last 5 reported fiscal years (annual statements), plus the current dividend yield. The start value is the median of the three years around the start, so a single crisis year (a pandemic or a write-down) does not distort the rate. Measured in JPY: this currency has depreciated against the euro and dollar over the long run, so part of the nominal rate is currency erosion that never reaches a EUR/USD investor.
−20.6%
Earnings growth per share plus dividend.
Earnings per share, growth per year−23.2%
Dividend (yield on the price)2.6%
Profit margin 2021 to 2026 ⓘOperating margin then vs now, from reported annual statements. A falling margin after a boom year is the classic peak-earnings signal: the growth rate then leans on an inflated base.3% → 3%
⚠ Revenue per share shrinking 17.0%/yr over ~6Y (margins eroding too) ⓘStructural-decline marker: revenue PER SHARE has fallen over the last decade (robust median trend, not a single year). Backtested across 2005 to 2017, such businesses trailed the market by about 2.5 percentage points per year. Display only: it does not change the fair value or the quality score.
Growth Forecast
Price in line with expectations
The price assumes less growth than the company has delivered so far and about what analysts expect.
What the price assumes ⓘThis turns our valuation around: instead of asking what the share is worth, it asks what growth the current price requires. It uses the cash the company keeps after all spending (free cash flow), the same discount rate as our models, five years of growth, then slowing evenly to 2 % a year by year ten. Compared with the analysts' sales forecasts extended to the same five years (at least three analysts, for context only, it does not enter the Fair Value): within 3 percentage points counts as "in line" (amber), below that little optimism (green), above that a lot of optimism (red).
+0.1%
Yearly growth needed for the next five years to justify today's price.
What forecasts expect ⓘAnalysts publish sales forecasts for the next two fiscal years. For the years after that, growth slows evenly to 2 % a year by year ten (2 % is the long-run rate our models use). Projected years are marked as such.
−1.3%
Yearly sales growth analysts expect, extended to five years.
After inflation (figures in JPY, Japan: IMF forecast 2.1% a year to 2030, 1.3% from 2016 to 2025) that is about −1.9% a year for the price and −3.3% for the forecasts.
Price, fair value, quality and upside side by side.
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Peer GroupⓘHow this stock ranks against its industry: the green marker is this stock, the band is the typical 25–75% peer range, and the tick is the median.Oil & Gas Refining & Marketing · 107 stocks
Beats the industry median on 6/14 measures
A mixed picture versus its industry peers.
Valuation
Quality Score49 · Below median
Fair Value upside+38.4% · Top 25%
Profitability
Return on equity (TTM)2.1% · Bottom 25%
Return on assets1.2% · Bottom 25%
Net margin (TTM)2.1% · Below median
Operating margin (TTM)8.1% · Above median
Growth and dividend
Revenue growth−9.8% · Bottom 25%
Dividend yield (TTM)2.6% · Below median
Balance sheet
Debt / equity0.31× · Above median
Valuation Multiplesvs Oil & Gas Refining & Marketing median · lower = cheaper
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Is Idemitsu Kosan Co.Ltd (IDKOF) overvalued or undervalued?
As of Sep 28, 2026, our model estimates a fair value of $12.68 versus the last price from Sep 25, 2026 of $10.59, about +20% upside (undervalued).
What is the fair value of IDKOF?
Our model-based fair value for Idemitsu Kosan Co.Ltd is $12.68 (as of Sep 28, 2026), built from audited fundamentals. Last price (from Sep 25, 2026): $10.59.
What is the quality score of IDKOF?
Idemitsu Kosan Co.Ltd has a Quality Score of 49/100. It measures business quality (profitability, growth, cash flow, balance-sheet strength, investment discipline, share issuance). Market factors such as price momentum and volatility do not enter the number; they are shown separately in the detail view.
What is the price target for Idemitsu Kosan Co.Ltd (IDKOF)?
Our model-based price target is the fair value of $12.68 (as of Sep 28, 2026) from 24 valuation models. Cautious scenario $9.51, optimistic scenario $15.85. It is a calculation from audited fundamentals, not an analyst target.
What is the Idemitsu Kosan Co.Ltd stock forecast for 2026?
Our models put fair value at $12.68, about +20% upside versus the last price from Sep 25, 2026 of $10.59 (undervalued). Cautious scenario $9.51, optimistic scenario $15.85. The calculation is refreshed regularly with new filings.
What is the revenue of Idemitsu Kosan Co.Ltd (IDKOF)?
Idemitsu Kosan Co.Ltd reported trailing-twelve-month revenue of about ¥8.1T (latest available figure, as of Sep 28, 2026).
Does Idemitsu Kosan Co.Ltd pay a dividend?
Idemitsu Kosan Co.Ltd currently shows a dividend yield of about 2.62% relative to its recent price (as of Sep 28, 2026).
What growth is priced into Idemitsu Kosan Co.Ltd (IDKOF)?
For today's price to be fair in a discounted-cash-flow model, Idemitsu Kosan Co.Ltd would have to grow free cash flow by +0.1 % per year for five years (discount rate 8.1 %, then slowing evenly to 2 % perpetual growth by year ten). Over the last 5 years revenue grew +12.2 % per year. As of Sep 28, 2026.
What discount rate (WACC) does the fair value of IDKOF use?
Our models discount Idemitsu Kosan Co.Ltd at 8.1 %: a base by market capitalisation (large), damped by beta 0.26, country premium for USA. The same rate applies in all 26 models.
What is a reverse DCF?
A reverse DCF turns the usual calculation around. Instead of deriving a value from assumptions, it takes today's price as given and asks: what free-cash-flow growth would a company have to deliver for exactly this price to be fair? The result is not a forecast but the expectation already priced in. For Idemitsu Kosan Co.Ltd that is +0.1 % per year a year over ten years, using the same discount rate (8.1 %) and the same formula as our fair value.
How much growth has Idemitsu Kosan Co.Ltd (IDKOF) delivered so far?
Over the past 5 years revenue at Idemitsu Kosan Co.Ltd grew +12.2 % a year. The price currently implies +0.1 % per year free-cash-flow growth a year. Comparing the two shows how much confidence is in the price: if it demands more than has been delivered, the business has to accelerate for the maths to work.
How fast is the sector of Idemitsu Kosan Co.Ltd (IDKOF) growing?
The median revenue growth in the sector is +9.2 % a year. That is the yardstick for the growth priced into Idemitsu Kosan Co.Ltd (+0.1 % per year a year): it shows whether the expectation is within the usual range or beyond it.
What is the free cash flow yield of Idemitsu Kosan Co.Ltd (IDKOF)?
The free-cash-flow yield on the price is 11.08 %: that much free cash flow Idemitsu Kosan Co.Ltd produces per unit of market value. When it exceeds the discount rate of our models (8.1 %), the business already earns more than its cost of capital demands, and the price needs little additional growth.
What is the intrinsic value of Idemitsu Kosan Co.Ltd (IDKOF)?
Intrinsic value and fair value mean the same thing: what the business is worth on its numbers, independent of the share price. For Idemitsu Kosan Co.Ltd it is $12.68 per share (as of Sep 28, 2026), against a price of $10.59. It is the blended result of 24 valuation models (cash flow, earnings, asset, dividend).
Is Idemitsu Kosan Co.Ltd stock overvalued or undervalued in 2026?
As of Sep 28, 2026, IDKOF trades below its calculated fair value: price $10.59, fair value $12.68, a gap of about +20% (undervalued). The calculation is refreshed with each new quarterly report, so the verdict can change during the year.
Is fair value the same as the market price of IDKOF?
No. The price is what the market pays today ($10.59); the fair value is what the company's own numbers justify ($12.68). For Idemitsu Kosan Co.Ltd the two are $2.09 per share apart. That gap is exactly why we show both numbers side by side.
How much is Idemitsu Kosan Co.Ltd worth?
The market values Idemitsu Kosan Co.Ltd at about $12.9B (market capitalisation, as of Sep 28, 2026). Per share that is $10.59; our models calculate a fair value of $12.68 per share.
What do the bullish and bearish scenarios say about IDKOF?
Our models span a range for Idemitsu Kosan Co.Ltd: cautious scenario $9.51, base $12.68, optimistic $15.85 per share (as of Sep 28, 2026, price $10.59). The range comes from different growth and margin assumptions, not from analyst opinions.
What is the P/E ratio of IDKOF?
Idemitsu Kosan Co.Ltd trades at a price-to-earnings ratio of 12.0 (as of Sep 28, 2026). A P/E on its own says little: it compares the price with ONE year of profit, while our fair value of $12.68 is built from several models across several years. Other multiples: P/B 1.1, P/S 0.3, EV/EBITDA 7.6.
How solid is the balance sheet of Idemitsu Kosan Co.Ltd (IDKOF)?
Balance-sheet figures for Idemitsu Kosan Co.Ltd (as of Sep 28, 2026): return on equity 2.1%, debt of 0.31 per unit of equity. They feed the Quality Score of 49/100, which measures business quality independently of the share price.
How far is IDKOF from its 52-week high?
Idemitsu Kosan Co.Ltd trades at $10.59, at its 52-week high of $10.59 and 61% above the low of $6.59 (as of Sep 25, 2026). Distance from the high says nothing about value: that is what the fair value of $12.68 is for.
Which stocks are comparable to Idemitsu Kosan Co.Ltd?
From the same area (Energy) we also value Reliance Industries Limited, Valero Energy Corporation, Marathon Petroleum Corporation, Phillips 66, among others. Each of them has its own fair-value calculation on this site using the same models, so the comparison is like for like.
Is Idemitsu Kosan Co.Ltd stock attractive at the current price?
The data as of Sep 28, 2026: price $10.59, calculated fair value $12.68 (+20%), Quality Score 49/100, from 24 models. Whether that fits your horizon and risk tolerance is your call. We provide the calculation, not investment advice.
How is the fair value of IDKOF calculated?
We run Idemitsu Kosan Co.Ltd through 24 models from four families: discounted cash flow, earnings models, asset and balance-sheet models, and dividend models. Every model gets the same audited fundamentals; the result is the weighted average of $12.68, with the spread shown as a cautious and an optimistic scenario.
Is it still worth investing in stocks now?
The global stock market currently sits 14.5 % above its aggregate fair value. Idemitsu Kosan Co.Ltd currently trades 16 % below its own fair value, and the market average says nothing about that. An expensive market is no reason to stay out and no reason to buy everything at once: keep a broad savings plan running, buy single stocks only with money you can do without, and hold part of your money liquid while the market is high. The full picture including sectors is on is it worth investing now.
What is the share price of Idemitsu Kosan Co.Ltd (IDKOF)?
The latest price we hold is from Sep 25, 2026 and stands at $10.59. Our model-based fair value is $12.68, about +20% upside (undervalued). We carry closing prices from our data provider, not a live tick.
What should I pay attention to with Idemitsu Kosan Co.Ltd right now?
The price sits in the lower half of our model range, the side with the larger margin of safety. The data supports the verdict: every model runs on fully documented inputs.
Key figures of Idemitsu Kosan Co.Ltd
How large is the market capitalisation of Idemitsu Kosan Co.Ltd (IDKOF)?
The market capitalisation of Idemitsu Kosan Co.Ltd is $12.9B. The stock-market value of the whole company: share price times number of shares. It is what the market asks for the entire business today.
What is the P/S ratio of Idemitsu Kosan Co.Ltd (IDKOF)?
The price-to-sales ratio of Idemitsu Kosan Co.Ltd is 0.26 (P/E × margin). Price to sales: market value relative to yearly revenue. Useful when profit is thin or distorted.
What are the earnings per share of Idemitsu Kosan Co.Ltd (IDKOF)?
Earnings per share at Idemitsu Kosan Co.Ltd are $0.8800 (price ÷ EPS = P/E 12.0). Earnings per share over the last twelve months: total profit spread across every single share.
What is the dividend yield of Idemitsu Kosan Co.Ltd (IDKOF)?
The dividend yield of Idemitsu Kosan Co.Ltd is 2.6% (payout 31.5%). Yearly dividend relative to the share price. 3% pays 3 per 100 invested. Below: how much of profit is used for it.
What is the net margin of Idemitsu Kosan Co.Ltd (IDKOF)?
The net margin of Idemitsu Kosan Co.Ltd is 2.1% (fiscal year 2026). How much of every unit of revenue ends up as profit. 10% means 10 cents of profit per dollar of sales.
What is the return on equity of Idemitsu Kosan Co.Ltd (IDKOF)?
The return on equity (ROE) of Idemitsu Kosan Co.Ltd is 2.1% (last twelve months). Profit relative to shareholders' equity, how efficiently the company works with its owners' money.
What is the EBIT return on assets of Idemitsu Kosan Co.Ltd (IDKOF)?
On an EBIT basis the return on assets of Idemitsu Kosan Co.Ltd is 5.9% (avg 5y). Operating profit (EBIT) relative to everything the company owns, as a multi-year average. It describes the business model rather than one good or bad year.
What is the operating margin of Idemitsu Kosan Co.Ltd (IDKOF)?
The operating margin of Idemitsu Kosan Co.Ltd is 8.1% (last twelve months). Profit from the core business (before interest and taxes) relative to revenue.
How fast is revenue growing at Idemitsu Kosan Co.Ltd (IDKOF)?
Revenue at Idemitsu Kosan Co.Ltd is growing −9.8% versus a year earlier (3y avg −5.0%). How much revenue grew versus a year earlier (YoY). The 3-year average next to it puts the single year in context.
How fast are earnings growing at Idemitsu Kosan Co.Ltd (IDKOF)?
Earnings per share at Idemitsu Kosan Co.Ltd are growing −36.3% versus a year earlier. How much earnings per share grew versus a year earlier.
How much net debt does Idemitsu Kosan Co.Ltd (IDKOF) carry?
The net debt of Idemitsu Kosan Co.Ltd is ¥1.1T (fiscal year 2026, ≈ 5.1 yrs of FCF). Debt minus cash on hand. The note shows how many years of free cash flow could in theory pay it off.
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Broad data
Sep 28, 2026