Idemitsu Kosan Co.,Ltd.

Oil & Coal Products ・ 5019

Figures below come from this company's annual securities report (有価証券報告書) filed with Japan's Financial Services Agency. Filing a false statement is a criminal offence, which is what makes them worth building on.

Average annual pay
¥10.0m
filing entity, incl. bonuses
vs peers
+¥4.36m
same industry & average age
Average age
42.0 yrs
Average tenure
17.0 yrs
Employees
14,392
consolidated
Market cap
J-Quants, ~12-week delay
Working here from 22 to 60est. ¥322m grossindustry norm ¥200m ・ ¥233m after tax and social insurance (73%)
What is left after tax and social insurance? →How much did the 2026 changes move it? →

Corporate Number 9010001011318 (National Tax Agency)

Workforce disclosure

Japan requires listed companies to disclose these three ratios. They are useful but easy to misread — the notes matter.

ItemValue What it does not tell you
Female managers6.0%definition of 'manager' varies by company
Male parental leave98.0%can exceed 100%; says nothing about duration
Gender pay gap (all workers)75.9%women's pay as % of men's; not equal-work comparison
Workplace score (beta)61.9deviation vs all listed, 50 = median
Investment score (beta)55.0deviation vs all listed, 50 = median

Pay history

From past annual securities reports. Reorganisations move this figure even when pay itself does not — the average covers the filing entity only.

Fiscal year endAverage annual pay
2024-03-31¥9.8m
2025-03-31¥9.9m
2026-03-31¥10.0m

Similar companies

Same sector, closest by average pay. A starting point for comparison — not a ranking. Pay differences here are driven as much by average age and by how much of the group sits inside the filing entity as by how well a company pays.

Company Average payAvg ageCode
MORESCO Corporation¥7.1m44.75018
Yushiro Inc.¥7.2m47.55013
NICHIREKI GROUP CO., LTD.¥8.4m44.95011
BP Castrol K.K.¥9.9m48.95015
ENEOS Holdings,Inc.¥11.4m43.05020
コスモエネルギーホールディングス株式会社¥11.9m42.05021

Limitations

Source: annual securities report (EDINET, Financial Services Agency of Japan); market data from J-Quants (JPX Market Innovation & Research), ~12-week delay. Compiled independently by Corpus; not provided or endorsed by any government agency. Full detail in Japanese: 出光興産株式会社.