Idemitsu Kosan
Financial history
- Revenue · FYE Mar 2026
- ¥8.11tn
- Operating profit · FYE Mar 2026
- ¥212bn
- Net profit · FYE Mar 2026
- ¥172bn
- Total assets
- ¥5.33tn
- Equity ratio
- 36.0%
- Long-term series
- 1959–2026
Idemitsu Kosan: long-term performance & turning pointsSales (revenue) and profit-margin ratio
Sales (¥ bn)Net margin (%)| Fiscal year | Unit | 1959 FYE Mar | 1960 FYE Mar | 1963 FYE Mar | 1964 FYE Mar | 1965 FYE Mar | 1966 FYE Mar | 1967 FYE Mar | 1968 FYE Mar | 1969 FYE Mar | 1977 FYE Mar | 2002 FYE Mar | 2003 FYE Mar | 2004 FYE Mar | 2005 FYE Mar | 2006 FYE Mar | 2007 FYE Mar | 2008 FYE Mar | 2009 FYE Mar | 2010 FYE Mar | 2011 FYE Mar | 2012 FYE Mar | 2013 FYE Mar | 2014 FYE Mar | 2015 FYE Mar | 2016 FYE Mar | 2017 FYE Mar | 2018 FYE Mar | 2019 FYE Mar | 2020 FYE Mar | 2021 FYE Mar | 2022 FYE Mar | 2023 FYE Mar | 2024 FYE Mar | 2025 FYE Mar | 2026 *1 FYE Mar |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue | JPY | ¥47bn | ¥68bn | ¥100bn | ¥170bn | ¥200bn | — | ¥235bn | ¥272bn | ¥297bn | ¥528bn | ¥2.37tn | ¥2.43tn | ¥2.45tn | ¥2.76tn | ¥3.33tn | ¥3.39tn | ¥3.86tn | ¥3.80tn | ¥3.11tn | ¥3.66tn | ¥4.31tn | ¥4.37tn | ¥5.03tn | ¥4.63tn | ¥3.57tn | ¥3.19tn | ¥3.73tn | ¥4.43tn | ¥6.05tn | ¥4.56tn | ¥6.69tn | ¥9.46tn | ¥8.72tn | ¥9.19tn | ¥8.11tn |
| YoY | % | — | +44.7% | — | +70.0% | +17.6% | — | — | +15.6% | +9.3% | — | — | +2.5% | +0.7% | +12.8% | +20.4% | +2.0% | +13.8% | -1.7% | -18.1% | +17.6% | +17.8% | +1.5% | +15.1% | -8.0% | -22.9% | -10.6% | +16.9% | +18.6% | +36.6% | -24.6% | +46.7% | +41.4% | -7.8% | +5.4% | -11.8% |
| Operating profit | JPY | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ¥71bn | ¥103bn | ¥56bn | ¥102bn | ¥45bn | ¥129bn | ¥138bn | ¥111bn | ¥78bn | -¥105bn | -¥20bn | ¥135bn | ¥201bn | ¥179bn | -¥3.9bn | ¥140bn | ¥435bn | ¥282bn | ¥346bn | ¥162bn | ¥212bn |
| YoY | % | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | +44.0% | -45.6% | +83.2% | -56.5% | +189.4% | +7.2% | -19.8% | -29.4% | -234.0% | — | — | +48.9% | -10.9% | -102.2% | — | +210.1% | -35.0% | +22.6% | -53.2% | +30.8% |
| Ordinary profit | JPY | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ¥71bn | ¥108bn | ¥61bn | ¥89bn | ¥30bn | ¥128bn | ¥134bn | ¥109bn | ¥82bn | -¥108bn | -¥22bn | ¥140bn | ¥226bn | ¥169bn | -¥14bn | ¥108bn | ¥459bn | ¥322bn | ¥385bn | ¥215bn | ¥230bn |
| Net profit | JPY | ¥0.3bn | ¥0.2bn | ¥0.9bn | ¥0.4bn | ¥0.4bn | ¥1.9bn | ¥1.8bn | ¥0.6bn | ¥0.9bn | ¥22bn | ¥6.7bn | ¥2.2bn | ¥3.7bn | -¥5.8bn | ¥27bn | ¥42bn | ¥4.8bn | ¥3.3bn | ¥5.9bn | ¥61bn | ¥64bn | ¥50bn | ¥36bn | -¥138bn | -¥36bn | ¥88bn | ¥162bn | ¥81bn | -¥23bn | ¥35bn | ¥279bn | ¥254bn | ¥229bn | ¥104bn | ¥172bn |
| YoY | % | — | -30.0% | — | -52.3% | -2.4% | +382.5% | -5.7% | -65.9% | +50.0% | — | — | -67.2% | +68.2% | -256.8% | — | +52.0% | -88.4% | -31.3% | +78.8% | +927.1% | +6.1% | -22.1% | -27.7% | -480.9% | — | — | +84.2% | -49.8% | -128.1% | — | +700.6% | -9.2% | -9.9% | -54.5% | +65.3% |
| Operating margin | % | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2.1% | 3.0% | 1.4% | 2.7% | 1.4% | 3.5% | 3.2% | 2.5% | 1.6% | -2.3% | -0.5% | 4.2% | 5.4% | 4.1% | -0.1% | 3.1% | 6.5% | 3.0% | 4.0% | 1.8% | 2.6% |
| Net margin | % | 0.6% | 0.3% | 0.9% | 0.2% | 0.2% | — | 0.8% | 0.2% | 0.3% | 4.1% | 0.3% | 0.1% | 0.2% | -0.2% | 0.8% | 1.2% | 0.1% | 0.1% | 0.2% | 1.7% | 1.5% | 1.1% | 0.7% | -3.0% | -1.0% | 2.8% | 4.4% | 1.8% | -0.4% | 0.8% | 4.2% | 2.7% | 2.6% | 1.1% | 2.1% |
- *1 Securities report
Cost structure Cost of sales SG&A Operating profit Operating margin
Where each yen of revenue goes — cost of sales, SG&A and what is left as operating profit (¥ bn, stacked)
| Fiscal year | Unit | 2006 *1 FYE Mar | 2007 *1 FYE Mar | 2008 *1 FYE Mar | 2009 *1 FYE Mar | 2010 *1 FYE Mar | 2011 *1 FYE Mar | 2012 *1 FYE Mar | 2013 *1 FYE Mar | 2014 *1 FYE Mar | 2015 *1 FYE Mar | 2016 *1 FYE Mar | 2017 *1 FYE Mar | 2018 *1 FYE Mar | 2019 *1 FYE Mar | 2020 *1 FYE Mar | 2021 *1 FYE Mar | 2022 *1 FYE Mar | 2023 *1 FYE Mar | 2024 *1 FYE Mar | 2025 *1 FYE Mar | 2026 *1 FYE Mar |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenue | JPY | ¥3.33tn | ¥3.39tn | ¥3.86tn | ¥3.80tn | ¥3.11tn | ¥3.66tn | ¥4.31tn | ¥4.37tn | ¥5.03tn | ¥4.63tn | ¥3.57tn | ¥3.19tn | ¥3.73tn | ¥4.43tn | ¥6.05tn | ¥4.56tn | ¥6.69tn | ¥9.46tn | ¥8.72tn | ¥9.19tn | ¥8.11tn |
| YoY | % | — | +2.0% | +13.8% | -1.7% | -18.1% | +17.6% | +17.8% | +1.5% | +15.1% | -8.0% | -22.9% | -10.6% | +16.9% | +18.6% | +36.6% | -24.6% | +46.7% | +41.4% | -7.8% | +5.4% | -11.8% |
| Cost of sales | JPY | ¥3.00tn | ¥3.06tn | ¥3.56tn | ¥3.44tn | ¥2.82tn | ¥3.27tn | ¥3.91tn | ¥4.01tn | ¥4.68tn | ¥4.43tn | ¥3.31tn | ¥2.77tn | ¥3.24tn | ¥3.94tn | ¥5.63tn | ¥4.00tn | ¥5.80tn | ¥8.66tn | ¥7.87tn | ¥8.50tn | ¥7.35tn |
| SG&A | JPY | ¥253bn | ¥230bn | ¥250bn | ¥254bn | ¥250bn | ¥258bn | ¥259bn | ¥258bn | ¥272bn | ¥303bn | ¥281bn | ¥284bn | ¥293bn | ¥308bn | ¥417bn | ¥419bn | ¥450bn | ¥512bn | ¥501bn | ¥527bn | ¥542bn |
| Operating profit | JPY | ¥71bn | ¥103bn | ¥56bn | ¥102bn | ¥44bn | ¥129bn | ¥138bn | ¥111bn | ¥78bn | -¥105bn | -¥20bn | ¥135bn | ¥201bn | ¥179bn | -¥3.9bn | ¥140bn | ¥434bn | ¥282bn | ¥346bn | ¥162bn | ¥212bn |
| YoY | % | — | +43.9% | -45.6% | +83.2% | -56.6% | +189.6% | +7.2% | -19.8% | -29.4% | -234.0% | — | — | +48.9% | -10.9% | -102.2% | — | +210.2% | -35.0% | +22.6% | -53.2% | +30.8% |
| Operating margin | % | 2.1% | 3.0% | 1.4% | 2.7% | 1.4% | 3.5% | 3.2% | 2.5% | 1.6% | -2.3% | -0.6% | 4.2% | 5.4% | 4.1% | -0.1% | 3.1% | 6.5% | 3.0% | 4.0% | 1.8% | 2.6% |
| Change | pp | — | +0.9pp | -1.6pp | +1.3pp | -1.3pp | +2.1pp | -0.3pp | -0.7pp | -0.9pp | -3.9pp | +1.7pp | +4.8pp | +1.2pp | -1.3pp | -4.2pp | +3.2pp | +3.4pp | -3.5pp | +1.0pp | -2.2pp | +0.8pp |
- *1 Securities report (yuka shoken hokokusho), as filed
Balance sheet Total assets Equity Interest-bearing debt Equity ratio
Total assets, equity and interest-bearing debt (¥ bn), with the equity ratio (%)
| Fiscal year | Unit | 2006 *1 FYE Mar | 2007 *1 FYE Mar | 2008 *1 FYE Mar | 2009 *1 FYE Mar | 2010 *1 FYE Mar | 2011 *1 FYE Mar | 2012 *1 FYE Mar | 2013 *1 FYE Mar | 2014 *1 FYE Mar | 2015 *1 FYE Mar | 2016 *1 FYE Mar | 2017 *1 FYE Mar | 2018 *1 FYE Mar | 2019 *1 FYE Mar | 2020 *1 FYE Mar | 2021 *1 FYE Mar | 2022 *1 FYE Mar | 2023 *1 FYE Mar | 2024 *1 FYE Mar | 2025 *1 FYE Mar | 2026 *1 FYE Mar |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total assets | JPY | ¥2.28tn | ¥2.33tn | ¥2.42tn | ¥2.29tn | ¥2.48tn | ¥2.52tn | ¥2.68tn | ¥2.73tn | ¥3.00tn | ¥2.73tn | ¥2.40tn | ¥2.64tn | ¥2.92tn | ¥2.89tn | ¥3.89tn | ¥3.95tn | ¥4.60tn | ¥4.87tn | ¥5.01tn | ¥4.78tn | ¥5.33tn |
| YoY | % | — | +2.3% | +3.7% | -5.4% | +8.1% | +1.7% | +6.5% | +1.7% | +9.8% | -8.8% | -12.0% | +10.0% | +10.5% | -1.0% | +34.5% | +1.7% | +16.4% | +5.7% | +3.0% | -4.7% | +11.6% |
| Equity | JPY | ¥369bn | ¥533bn | ¥496bn | ¥443bn | ¥470bn | ¥514bn | ¥615bn | ¥688bn | ¥744bn | ¥587bn | ¥501bn | ¥584bn | ¥869bn | ¥842bn | ¥1.15tn | ¥1.15tn | ¥1.41tn | ¥1.61tn | ¥1.80tn | ¥1.72tn | ¥1.92tn |
| YoY | % | — | +44.5% | -6.9% | -10.7% | +6.0% | +9.6% | +19.4% | +12.0% | +8.1% | -21.0% | -14.7% | +16.6% | +48.8% | -3.1% | +36.6% | +0.1% | +22.7% | +14.3% | +11.5% | -4.4% | +11.5% |
| Interest-bearing debt | JPY | ¥992bn | ¥834bn | ¥858bn | ¥920bn | ¥954bn | ¥981bn | ¥916bn | ¥893bn | ¥1.08tn | ¥914bn | ¥845bn | ¥882bn | ¥689bn | ¥686bn | ¥908bn | ¥972bn | ¥960bn | ¥1.01tn | ¥922bn | ¥890bn | ¥998bn |
| Equity ratio | % | 16.2% | 22.8% | 20.5% | 19.3% | 19.0% | 20.4% | 22.9% | 25.2% | 24.8% | 21.5% | 20.8% | 22.1% | 29.7% | 29.1% | 29.6% | 29.1% | 30.7% | 33.2% | 35.9% | 36.0% | 36.0% |
| Change | pp | — | +6.6pp | -2.3pp | -1.2pp | -0.3pp | +1.4pp | +2.5pp | +2.3pp | -0.4pp | -3.3pp | -0.7pp | +1.3pp | +7.6pp | -0.6pp | +0.5pp | -0.5pp | +1.6pp | +2.5pp | +2.7pp | +0.1pp | 0.0pp |
- *1 Securities report (yuka shoken hokokusho), as filed
Cash flow Operating CF Investing CF Financing CF
Cash generated by operations, spent on investment and raised or repaid in financing (¥ bn)
| Fiscal year | Unit | 2002 *1 FYE Mar | 2003 *1 FYE Mar | 2004 *1 FYE Mar | 2005 *1 FYE Mar | 2006 *1 FYE Mar | 2007 *1 FYE Mar | 2008 *1 FYE Mar | 2009 *1 FYE Mar | 2010 *1 FYE Mar | 2011 *1 FYE Mar | 2012 *1 FYE Mar | 2013 *1 FYE Mar | 2014 *1 FYE Mar | 2015 *1 FYE Mar | 2016 *1 FYE Mar | 2017 *1 FYE Mar | 2018 *1 FYE Mar | 2019 *1 FYE Mar | 2020 *1 FYE Mar | 2021 *1 FYE Mar | 2022 *1 FYE Mar | 2023 *1 FYE Mar | 2024 *1 FYE Mar | 2025 *1 FYE Mar | 2026 *1 FYE Mar |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operating CF | JPY | ¥146bn | ¥72bn | ¥190bn | ¥87bn | ¥56bn | ¥86bn | ¥60bn | ¥235bn | -¥63bn | ¥87bn | ¥160bn | ¥51bn | ¥50bn | ¥173bn | ¥216bn | ¥54bn | ¥137bn | ¥151bn | -¥33bn | ¥170bn | ¥146bn | -¥33bn | ¥377bn | ¥477bn | ¥392bn |
| YoY | % | — | -51.0% | +165.2% | -54.4% | -34.9% | +53.2% | -30.6% | +292.7% | -126.7% | — | +83.6% | -68.2% | -1.4% | +245.2% | +25.1% | -75.3% | +155.4% | +10.4% | -121.7% | — | -14.3% | -122.5% | — | +26.3% | -17.7% |
| Investing CF | JPY | -¥18bn | -¥16bn | -¥53bn | -¥4.9bn | -¥54bn | -¥63bn | -¥78bn | -¥86bn | -¥139bn | -¥75bn | -¥59bn | -¥71bn | -¥180bn | -¥131bn | -¥98bn | -¥215bn | -¥90bn | -¥122bn | -¥134bn | -¥110bn | -¥112bn | ¥70bn | -¥66bn | -¥119bn | -¥292bn |
| Financing CF | JPY | -¥104bn | -¥129bn | -¥86bn | -¥136bn | -¥75bn | -¥37bn | ¥9.0bn | ¥61bn | ¥24bn | ¥13bn | -¥79bn | -¥46bn | ¥161bn | -¥98bn | -¥106bn | ¥136bn | -¥52bn | -¥20bn | ¥158bn | -¥56bn | -¥30bn | -¥90bn | -¥281bn | -¥343bn | -¥105bn |
| Cash & equivalents | JPY | ¥266bn | ¥208bn | ¥257bn | ¥203bn | ¥133bn | ¥123bn | ¥114bn | ¥302bn | ¥134bn | ¥155bn | ¥171bn | ¥116bn | ¥160bn | ¥111bn | ¥119bn | ¥90bn | ¥87bn | ¥91bn | ¥129bn | ¥131bn | ¥139bn | ¥103bn | ¥137bn | ¥164bn | ¥157bn |
| YoY | % | — | -21.7% | +23.3% | -20.7% | -34.8% | -7.7% | -7.2% | +166.1% | -55.7% | +15.6% | +10.6% | -31.9% | +37.4% | -30.5% | +6.8% | -24.2% | -3.6% | +4.4% | +42.6% | +1.3% | +6.2% | -25.9% | +32.8% | +20.0% | -4.4% |
- *1 Securities report (yuka shoken hokokusho), as filed
Key ratios Operating margin Net margin ROE Equity ratio
Profitability and balance-sheet strength (%). ROE uses year-end equity.
| Fiscal year | Unit | 2002 *1 FYE Mar | 2003 *1 FYE Mar | 2004 *1 FYE Mar | 2005 *1 FYE Mar | 2006 *1 FYE Mar | 2007 *1 FYE Mar | 2008 *1 FYE Mar | 2009 *1 FYE Mar | 2010 *1 FYE Mar | 2011 *1 FYE Mar | 2012 *1 FYE Mar | 2013 *1 FYE Mar | 2014 *1 FYE Mar | 2015 *1 FYE Mar | 2016 *1 FYE Mar | 2017 *1 FYE Mar | 2018 *1 FYE Mar | 2019 *1 FYE Mar | 2020 *1 FYE Mar | 2021 *1 FYE Mar | 2022 *1 FYE Mar | 2023 *1 FYE Mar | 2024 *1 FYE Mar | 2025 *1 FYE Mar | 2026 *1 FYE Mar |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operating margin | % | — | — | — | — | 2.1% | 3.0% | 1.4% | 2.7% | 1.4% | 3.5% | 3.2% | 2.5% | 1.6% | -2.3% | -0.6% | 4.2% | 5.4% | 4.1% | -0.1% | 3.1% | 6.5% | 3.0% | 4.0% | 1.8% | 2.6% |
| Change | pp | — | — | — | — | — | +0.9pp | -1.6pp | +1.3pp | -1.3pp | +2.1pp | -0.3pp | -0.7pp | -0.9pp | -3.9pp | +1.7pp | +4.8pp | +1.2pp | -1.3pp | -4.2pp | +3.2pp | +3.4pp | -3.5pp | +1.0pp | -2.2pp | +0.8pp |
| Net margin | % | 0.3% | 0.1% | 0.2% | -0.2% | 0.8% | 1.2% | 0.1% | 0.1% | 0.2% | 1.7% | 1.5% | 1.1% | 0.7% | -3.0% | -1.0% | 2.8% | 4.4% | 1.8% | -0.4% | 0.8% | 4.2% | 2.7% | 2.6% | 1.1% | 2.1% |
| Change | pp | — | -0.2pp | +0.1pp | -0.4pp | +1.0pp | +0.4pp | -1.1pp | 0.0pp | +0.1pp | +1.5pp | -0.2pp | -0.4pp | -0.4pp | -3.7pp | +2.0pp | +3.8pp | +1.6pp | -2.6pp | -2.2pp | +1.2pp | +3.4pp | -1.5pp | -0.1pp | -1.5pp | +1.0pp |
| ROE | % | — | — | — | — | 7.4% | 7.8% | 1.0% | 0.8% | 1.3% | 11.8% | 10.5% | 7.3% | 4.9% | -23.5% | -7.2% | 15.1% | 18.7% | 9.7% | -2.0% | 3.0% | 19.8% | 15.7% | 12.7% | 6.0% | 9.0% |
| Change | pp | — | — | — | — | — | +0.4pp | -6.8pp | -0.2pp | +0.5pp | +10.5pp | -1.3pp | -3.2pp | -2.4pp | -28.4pp | +16.3pp | +22.3pp | +3.6pp | -9.0pp | -11.7pp | +5.0pp | +16.8pp | -4.1pp | -3.0pp | -6.7pp | +3.0pp |
| Equity ratio | % | — | — | — | — | 16.2% | 22.8% | 20.5% | 19.3% | 19.0% | 20.4% | 22.9% | 25.2% | 24.8% | 21.5% | 20.8% | 22.1% | 29.7% | 29.1% | 29.6% | 29.1% | 30.7% | 33.2% | 35.9% | 36.0% | 36.0% |
| Change | pp | — | — | — | — | — | +6.6pp | -2.3pp | -1.2pp | -0.3pp | +1.4pp | +2.5pp | +2.3pp | -0.4pp | -3.3pp | -0.7pp | +1.3pp | +7.6pp | -0.6pp | +0.5pp | -0.5pp | +1.6pp | +2.5pp | +2.7pp | +0.1pp | 0.0pp |
- *1 Securities report (yuka shoken hokokusho), as filed
Reporting basis
Which accounting standard each fiscal year was filed under. Figures are not strictly comparable across a change of standard.
| Fiscal year | Unit | 2002 *1 FYE Mar | 2003 *1 FYE Mar | 2004 *1 FYE Mar | 2005 *1 FYE Mar | 2006 *1 FYE Mar | 2007 *1 FYE Mar | 2008 *1 FYE Mar | 2009 *1 FYE Mar | 2010 *1 FYE Mar | 2011 *1 FYE Mar | 2012 *1 FYE Mar | 2013 *1 FYE Mar | 2014 *1 FYE Mar | 2015 *1 FYE Mar | 2016 *1 FYE Mar | 2017 *1 FYE Mar | 2018 *1 FYE Mar | 2019 *1 FYE Mar | 2020 *1 FYE Mar | 2021 *1 FYE Mar | 2022 *1 FYE Mar | 2023 *1 FYE Mar | 2024 *1 FYE Mar | 2025 *1 FYE Mar | 2026 *1 FYE Mar |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | JGAAP | |
| Basis | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated | Consolidated |
- *1 Securities report (yuka shoken hokokusho), as filed
Yen–dollar exchange rate ¥ per US$1
Annual average, yen per one US dollar. Every figure above is in yen as filed — convert one using the rate of its own year, never today's. A higher line is a weaker yen.
| Fiscal year | Unit | 1949 *1 Cal. year | 1950 *1 Cal. year | 1951 *1 Cal. year | 1952 *1 Cal. year | 1953 *1 Cal. year | 1954 *1 Cal. year | 1955 *1 Cal. year | 1956 *1 Cal. year | 1957 *1 Cal. year | 1958 *1 Cal. year | 1959 *1 Cal. year | 1960 *1 Cal. year | 1961 *1 Cal. year | 1962 *1 Cal. year | 1963 *1 Cal. year | 1964 *1 Cal. year | 1965 *1 Cal. year | 1966 *1 Cal. year | 1967 *1 Cal. year | 1968 *1 Cal. year | 1969 *1 Cal. year | 1970 *1 Cal. year | 1971 *1 Cal. year | 1972 *2 Cal. year | 1973 *3 Cal. year | 1974 *3 Cal. year | 1975 *3 Cal. year | 1976 *3 Cal. year | 1977 *3 Cal. year | 1978 *3 Cal. year | 1979 *3 Cal. year | 1980 *4 Cal. year | 1981 *4 Cal. year | 1982 *4 Cal. year | 1983 *4 Cal. year | 1984 *4 Cal. year | 1985 *4 Cal. year | 1986 *4 Cal. year | 1987 *4 Cal. year | 1988 *4 Cal. year | 1989 *4 Cal. year | 1990 *4 Cal. year | 1991 *4 Cal. year | 1992 *4 Cal. year | 1993 *4 Cal. year | 1994 *4 Cal. year | 1995 *4 Cal. year | 1996 *4 Cal. year | 1997 *4 Cal. year | 1998 *4 Cal. year | 1999 *4 Cal. year | 2000 *4 Cal. year | 2001 *4 Cal. year | 2002 *4 Cal. year | 2003 *4 Cal. year | 2004 *4 Cal. year | 2005 *4 Cal. year | 2006 *4 Cal. year | 2007 *4 Cal. year | 2008 *4 Cal. year | 2009 *4 Cal. year | 2010 *4 Cal. year | 2011 *4 Cal. year | 2012 *4 Cal. year | 2013 *4 Cal. year | 2014 *4 Cal. year | 2015 *4 Cal. year | 2016 *4 Cal. year | 2017 *4 Cal. year | 2018 *4 Cal. year | 2019 *4 Cal. year | 2020 *4 Cal. year | 2021 *4 Cal. year | 2022 *4 Cal. year | 2023 *4 Cal. year | 2024 *4 Cal. year | 2025 *4 Cal. year | 2026 *4,5 Cal. year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rate | ¥/US$ | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥360.00 | ¥308.00 | ¥274.00 | ¥293.00 | ¥299.00 | ¥292.00 | ¥257.00 | ¥201.00 | ¥230.00 | ¥226.69 | ¥220.55 | ¥249.06 | ¥237.48 | ¥237.53 | ¥238.53 | ¥168.52 | ¥144.60 | ¥128.13 | ¥137.98 | ¥144.81 | ¥134.51 | ¥126.67 | ¥111.18 | ¥102.22 | ¥94.05 | ¥108.77 | ¥121.02 | ¥130.89 | ¥113.84 | ¥107.74 | ¥121.52 | ¥125.28 | ¥115.92 | ¥108.16 | ¥110.15 | ¥116.28 | ¥117.77 | ¥103.33 | ¥93.53 | ¥87.77 | ¥79.78 | ¥79.79 | ¥97.60 | ¥105.84 | ¥121.02 | ¥108.84 | ¥112.16 | ¥110.40 | ¥109.01 | ¥106.78 | ¥109.78 | ¥131.37 | ¥140.51 | ¥151.50 | ¥149.65 | ¥158.16 |
| YoY | % | — | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | -14.4% | -11.0% | +6.9% | +2.0% | -2.3% | -12.0% | -21.8% | +14.4% | -1.4% | -2.7% | +12.9% | -4.6% | 0.0% | +0.4% | -29.4% | -14.2% | -11.4% | +7.7% | +4.9% | -7.1% | -5.8% | -12.2% | -8.1% | -8.0% | +15.7% | +11.3% | +8.2% | -13.0% | -5.4% | +12.8% | +3.1% | -7.5% | -6.7% | +1.8% | +5.6% | +1.3% | -12.3% | -9.5% | -6.2% | -9.1% | 0.0% | +22.3% | +8.4% | +14.3% | -10.1% | +3.1% | -1.6% | -1.3% | -2.0% | +2.8% | +19.7% | +7.0% | +7.8% | -1.2% | +5.7% |
- *1 1949-1971: Fixed Bretton Woods peg ¥360/$ (Dodge Line 1949; Smithsonian ¥308 from Dec 1971).
- *2 1972: Smithsonian peg ¥308/$ (held until Feb 1973 float).
- *3 1973-1979: JIL (Japan Institute for Labour Policy and Training) g0001.xlsx — fiscal-year (Apr–Mar) basis, integer-rounded. PROVISIONAL; upgrade to BOJ FXERM07 calendar-year later.
- *4 1980-2026: Bank of Japan stat-search FM08'FXERM07 (Tokyo market, USD/JPY spot, 17:00 fixing, monthly average) — calendar-year average of monthly averages.
- *5 Provisional — part-year average, not a full calendar year.
All figures are in Japanese yen as filed. Where a foreign-currency comparison is needed elsewhere on this site, yen amounts are converted at the average rate of each figure's own year — not today's rate. Exchange rates & sources →
Read the company history → 日本語版（詳細）— full financial data in Japanese →
Disclaimer
- This page is provided for general information only and is not investment advice, nor a recommendation to buy or sell any security.
- Figures are compiled independently and include our own estimates, approximations and machine-processed data; we make no warranty as to their accuracy or completeness.
- Sources are primarily each company's securities reports and other public filings, but errors and omissions may remain.
- Any use of this information is at the reader's own risk. Past performance does not indicate future results.
- Company names, logos and other marks belong to their respective owners.
Data API
Idemitsu Kosan’s history, financials, executives and
shareholders are published as static JSON — no key, plain GET.
| Method | Endpoint | Returns |
|---|---|---|
| GET | /api/companies.json | All companies |
| GET | /api/5019/manifest.json | Resource index |
| GET | /api/5019/history.json | History overview |
| GET | /api/5019/timeline.json | Chronology |
| GET | /api/decisions.json | All management decisions (index) |
| GET | /api/5019/decisions.json | Management decisions (index) |
| GET | /api/5019/decisions/{slug}.json | One decision (full dossier) |
| GET | /api/5019/executives.json | Executives |
| GET | /api/5019/shareholders.json | Major shareholders |
| GET | /api/5019/financials.json | Financial statements |
| GET | /api/5019/financials-longterm.json | Long-term results |
| GET | /api/5019/segments.json | Business segments |
| GET | /api/5019/regions.json | Sales by region |
| GET | /api/5019/workforce.json | Workforce |