Start with its own history
At 4.54×, IDKOY is 51.0% below its 9-observation annual average. A lower multiple can reflect a lower price, higher earnings, or weaker growth expectations—not necessarily a bargain.
OTC · IDKOYOil & Gas Refining & MarketingUpdated Nov 5, 2026
Idemitsu Kosan Co.,Ltd. P/E ratio
Current valuation, historical context, and peer comparisons.
Current P/E ratio
4.54×
51.0% belowthe 9-observation annual average
Share price18.22
÷Earnings per share4.0131
Price and EPS in quote currency. Calculation details
Investors are paying 4.54 for every 1 of reported earnings per share.
P/E over time
2017 – 2026
Annual P/ESelected-period average 9.26×
3-year average10.26×3 positive annual observations
5-year average7.55×5 positive annual observations
10-year average9.26×9 positive annual observations
Peer median · TTM7.94×8 peers with positive P/E
Historical P/E ratios
Annual period-end data · 15 observations
| Period end | P/E | Change |
|---|---|---|
| Mar 31, 2026 | 10.98× | -18.8% |
| Mar 31, 2025 | 13.53× | +115.7% |
| Mar 31, 2024 | 6.27× | +84.6% |
| Mar 31, 2023 | 3.40× | -5.3% |
| Mar 31, 2022 | 3.59× | -85.2% |
| Mar 31, 2021 | 24.30× | N/M |
| Mar 31, 2020 | N/M | N/M |
| Mar 31, 2019 | 9.45× | +97.4% |
View all 15 annual observations +
| Period end | P/E | Change |
|---|---|---|
| Mar 31, 2018 | 4.79× | -31.8% |
| Mar 31, 2017 | 7.02× | N/M |
| Mar 31, 2016 | N/M | N/M |
| Mar 31, 2015 | N/M | N/M |
| Mar 31, 2014 | 9.34× | +49.8% |
| Mar 31, 2013 | 6.23× | +21.6% |
| Mar 31, 2012 | 5.12× | N/M |
Change is relative to the preceding observation. N/M values are excluded from averages.
How IDKOY compares
Company P/E vs. peer trailing-12-month ratios
| Company | P/E ratio |
|---|---|
 IDKOY This stockIdemitsu Kosan Co.,Ltd. | 4.54× |
 JXHLYENEOS Holdings, Inc. | 5.02× |
 NTOIYNeste Oyj | 8.83× |
 VLOValero Energy Corporation | 8.21× |
 MPCMarathon Petroleum Corporation | 7.67× |
 PSXPhillips 66 | 8.26× |
 DINOHF Sinclair Corporation | 5.29× |
 RELIANCE.NSReliance Industries Limited | 21.63× |
 MOHCYMotor Oil (Hellas) Corinth Refineries S.A. | 5.78× |
Peers are selected by the data provider. Business models and earnings definitions can differ.
Put the numbers in context
What does IDKOY’s P/E tell you?
Compare like with like
The median of the 8 positive peer ratios above is 7.94×. Check growth, margins, debt, and earnings quality before interpreting the gap. A faster-growing business may justify a higher multiple.
Check what drives earnings
One-off gains can temporarily lower P/E; unusual charges can raise it. Reported earnings and forward estimates answer different questions. Pair this view with return on equity and liquidity for a fuller picture.
Keep your research connected
Take IDKOY into your spreadsheet
Pull historical P/E into Excel or Google Sheets with Wisesheets. Build your own comparisons alongside the rest of your financial model.
Explore WisesheetsQuarterly P/E · latest quarterLQ selects the latest reported quarter. Requires the Wisesheets add-in. See available data
=WISE("IDKOY", "PE Ratio", "LQ")Sources & calculation methodology
Current P/E
Share price 18.22 ÷ EPS 4.0131 = 4.54×. Data is supplied by Financial Modeling Prep through Wisesheets. Quote feed updated Nov 5, 2026; this is not a real-time trading quote.
History & averages
Annual and quarterly P/E observations are provided separately from the current quote. Averages use the latest 3, 5, or 10 annual observations, excluding missing and nonpositive ratios. Pre-IPO observations are omitted. These are period-end observations, not daily averages.
Data definitions and limitations
The current quote feed does not specify the exact EPS filing-period end or whether EPS is basic or diluted. We do not label it as forward P/E. Peer ratios are explicitly trailing-12-month (TTM) values. Historical observations do not include independently verified price and EPS inputs. Sources may update on different schedules; rounded inputs can produce small calculation differences. Historical comparisons describe past pricing, not an estimate of fair value.
IDKOY P/E ratio: common questions
The essentials behind the numbers.
Idemitsu Kosan Co.,Ltd.'s current P/E is 4.54× based on the quote data last updated Nov 5, 2026. It represents the share price divided by reported earnings per share. Prices and earnings may refresh on different schedules.
Annual P/E uses earnings for a completed fiscal year. Trailing-12-month (TTM) P/E uses the latest four quarters, while forward P/E uses forecast earnings. These are not interchangeable. This page labels peer ratios as TTM and shows dated annual or quarterly historical observations; it does not show forward estimates.
N/M means not meaningful: the feed has no positive P/E for that observation. Negative or zero earnings should not be ranked as a low positive valuation multiple. N/M observations are excluded from the averages shown above.
Divide the share price by earnings per share (EPS). For example, a share price of 100 and EPS of 5 gives a P/E of 20×. This page uses the price and EPS supplied together in the quote when both are positive.
Price timestamps, EPS definitions, share classes, adjustments, and fiscal periods can differ. A forward P/E also uses forecast earnings rather than reported earnings. Compare the inputs and as-of dates before comparing two displayed ratios.
Not necessarily. The average describes previous market pricing, not fair value. Changes in earnings quality, growth expectations, debt, accounting, and business risk can justify a different multiple today.