Idemitsu ESG Data

Environmental

・Please refer to the notes for the reporting scope of each data set.
・Data marked with a checkmark for fiscal year 2025 has been verified by a third-party organization.

GHG Emissions by Scope^*1		Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
Scope 1	CO₂^*2	Thousand t-CO₂	13,080	12,119	12,359	✔
	CH₄	Thousand t-CO₂	281	67	75	✔
	HFC	Thousand t-CO₂	0.3	0.3	0.2	✔
	N₂O	Thousand t-CO₂	125	99	129	✔
	SF₆	Thousand t-CO₂	0.1	0.1	0.1	✔
	Total^*2	Thousand t-CO₂	13,487	12,285	12,563	✔	Total 7 GHGs (no use of PFCs, NF₃) converted to carbon dioxide
Scope 2		Thousand t-CO₂	473	541	465	✔
Scope3 (Category11)		Thousand t-CO₂	117,297	101,507	100,350	✔	Use of sold products: Emissions from the use of products manufactured and sold by the Company and its consolidated group, calculated based on coal/natural gas production and fuel/LPG production at refineries and complexes
Scope1+2^*2		Thousand t-CO₂	13,553	12,660	12,824	✔
Scope1+2^*2		Thousand t-CO₂e	13,960	12,826	13,028	✔	Total 7 GHGs (no use of PFCs, NF₃) converted to carbon dioxide
Scope1+2+3^*2		Thousand t-CO₂	130,850	114,166	113,174	✔	Scope3 records category11 (only Independent Practitioner’s Assurance coverage)
Scope1+2+3^*2		Thousand t-CO₂e	131,257	114,333	113,378	✔	Total 7 GHGs (no use of PFCs, NF₃) converted to carbon dioxide

Trends in CO₂ Emissions (Baseline)	Unit	FY2013	Note
Scope 1+2 ^*1	Thousand t-CO₂	15,870

Trends in CO₂ Emissions	Unit	FY2023	FY2024	FY2025	third party Warranty Independent Practitioner's Assurance	Note
Scope 1+2 ^*1	Thousand t-CO₂	13,553	12,660	12,824	✔	Total emissions that are the basis for calculating CO₂ (Scope1+2) reduction target for FY2030: 30-46% reduction compared to FY2013

CO₂削減率の推移 Trends in CO₂ reduction rate	Unit	FY2023	FY2024	FY2025	third party Warranty Independent Practitioner's Assurance	Note
CO₂ reduction rate^*1,2	%	14.6	20.2	19.2	✔	Reduction rate for fiscal 2013 emissions

Carbon Intensity Reduction rate trends ^*1	Unit	FY2023	FY2024	FY2025	third party Warranty Coverage Independent Practitioner's Assurance	Note
Carbon Intensity reduction rate	％	1.1	0.7	0.5	✔	Reduction rate related to the Carbon Intensity target for FY2040: 20-50% reduction compared to FY2020.

Scope 3 emissions (Idemitsu Kosan only)		Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
Scope3 ^*	Category 1: Purchased products and services ^*2	Thousand t-CO₂	15,504	14,718	13,853	✔
	Category3: Fuel- and energy-related activities (not included in Scope1 or 2)^*1	Thousand t-CO₂	2,918	2,378	2,561	✔
	Category4: Upstream transportation and distribution	Thousand t-CO₂	2,509	2,457	2,632	✔
	Category11: Use of sold products^*1	Thousand t-CO₂	123,241	115,985	116,532	✔	Use of sold products: Emissions from the use of products (including coal, natural gas, fuel oil, and LPG, etc. ) sold by Idemitsu Kosan Co.,Ltd.
	Category12: End-of-life treatment of sold products^*1	Thousand t-CO₂	5,843	5,355	5,397	✔

Calculated using National Institute of Advanced Industrial Science and Technology IDEA Ver.3.2 and 3.3

GHG Emissions perUnit of Production	Unit	FY2023	FY2024	FY2025	third party Warranty Independent Practitioner's Assurance	Note
Natural gas production ^*3	t-CO₂e/boe	0.025	0.026	0.020	✔	Unit: GHG emissions / natural gas production
Coal production ^*4	t-CO₂e /t	0.066	0.042	0.049	✔	Unit: GHG emissions / coal production
Oil refining ^*5	t-CO₂e/bbl	0.036	0.046	0.038	✔	Unit: GHG emissions / refinery throughput
Petrochemical factory ^*6	t-CO₂e /t	0.977	0.983	1.024	✔	Unit: GHG emissions / petrochemicals production (ethylene equivalent)

Energy Consumption	Unit	FY2023	FY2024	FY2025	third party Warranty Independent Practitioner's Assurance	Note
Heat equivalent value ^*1	P.J.	208	190	194	✔
Crude oil equivalent value ^*1	Thousand kL	5,358	4,892	4,995	✔
Energy consumption intensity (Refinery) ^*5	L/kL	8.85	9.04	9.08	✔	Unit: Crude oil equivalent energy consumption (L) / atmospheric distillation equipment converted throughput (kL)
Energy consumption intensity (Petrochemical factory) ^*6	kL/t	0.46	0.45	0.48	✔	Unit: Crude oil equivalent energy consumption (kL) / ethylene equivalent production (t)

Water Resources Water Resources intake/discharge volume ^*1	Unit	FY2023	FY2024	FY2025	third party Warranty Independent Practitioner's Assurance	Note
Seawater intake	Thousand tons	1,324,750	1,285,635	1,338,807	✔
Industrial water intake	Thousand tons	85,178	94,030	91,427	✔
Tap water intake	Thousand tons	2,375	1,906	1,928	✔
Underground water intake	Thousand tons	15,319	12,700	12,151	✔	Underground water also contains hot water from geothermal power generation.
Total water intake	Thousand tons	1,427,620	1,394,272	1,444,312	✔
Wastewater destination (sea)	Thousand tons	1,324,750	1,285,635	1,338,807
Wastewater destination (other)	Thousand tons	95,938	102,315	104,278		The destination includes reduced water (hot water) used in geothermal power generation.
Wastewater	Thousand tons	1,420,687	1,387,950	1,443,085	✔
Recycling rate	％	94	93	93	✔	The water recycling rate only applies to industrial water. (1.Industrial water intake: 91,427; 2.Industrial water use: 1,309,322; 3.Industrial water recycling: 1,217,895, Water recycling rate =3 / 2) ^*2＝1＋3

Water Withdrawal Rate^*1	Unit	FY2023	FY2024	FY2025	third party Warranty Independent Practitioner's Assurance	Note
Natural gas production ^*3	t/boe	0.692	0.74	0.79	✔	Unit: Water withdrawal / natural gas production
Coal production ^*4	t/t	0.713	0.32	0.33	✔	Unit: Water withdrawal / coal production
Oil refining ^*5	t/bbl	3.223	3.73	3.66	✔	Unit: Water withdrawal / refinery throughput
Petrochemical factory ^*6	t/t	171	176	194	✔	Unit: Water withdrawal / petrochemicals production (ethylene equivalent)

Water Pollution Effects	Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
COD ^*7	t	198	174	190	✔	Laws: Water Pollution Control Law
Total nitrogen ^*8	t	222	224	194	✔
Total phosphorus ^*8	t	3.9	5.1	3.7	✔

Air pollutant emissions ^*10	Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
SOx	t	10,047	8,287	7,983	✔	Laws: Air Pollution Control Act
NOx	t	21,822	20,451	19,338	✔
Soot/dust	t	240	215	203	✔
VOC	t	6,474	5,904	5,408	✔

Waste ^*9	Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
Total waste	t	242,238	218,202	238,983	✔	Total amount of industrial waste and specially controlled industrial waste Laws: Waste Management and Public Cleansing Law
Reduced by intermediate treatment	t	85,399	77,270	82,870	✔
Recycled	t	115,369	101,714	120,906	✔
Final disposal	t	1,915	1,125	321	✔
Final disposal rate	%	0.791	0.52	0.13	✔

Hazardous waste ^*9	Unit	FY2023	FY2024	FY2025	Note
Total waste	t	14,274	16,420	21,741	Specially controlled industrial waste is defined as hazardous waste Related laws and regulations: Waste treatment and cleaning laws
Reduced by intermediate treatment	t	2,409	628	233
Recycled	t	10,032	15,135	21,508
Final disposal	t	1,833	657	0
Final disposal rate	%	12.84	4.00	0.00

Non-hazardous waste ^*9	Unit	FY2023	FY2024	FY2025	Note
Total waste	t	227,964	201,781	217,242	Defining industrial waste as non-hazardous waste Related laws and regulations: Waste treatment and cleaning laws
Reduced by intermediate treatment	t	82,990	76,642	82,638
Recycled	t	105,337	86,579	99,398
Final disposal	t	82	468	321
Final disposal rate	%	0.036	0.23	0.15

Discharge and Transfer of PRTR-Designated Substances^*1	Unit	FY2023	FY2024	FY2025	Note
Discharged amount – Emissions to atmosphere	t	452	425	452	Act on the Assessment of Releases of Specified Chemical Substances in the Environment and the Promotion of Management Improvement
Total/Discharged amount – Emissions to public water bodies	t	12	13	13
Total/Transferred amount – Disposed amount	t	206	219	235

Number of environmental abnormalities ^11 Number of Serious Environmental Incidents^11	Unit	FY2023	FY2024	2025	third party Warranty Independent Practitioner's Assurance	Note
	Cases	2	4	1

ISO14001（環境マネジメントシステム）取得状況Acquisition Status of ISO 14001 (Environmental Management Systems)	Unit	As of June 30, 2024	As of June 30, 2025	As of June 30, 2026	Third partyIndependent Practitioner's Assurance	Note
Domestic business sites	number of certifications	15	13	14		From the perspective of environmental management, it covers more than 95% of CO₂ emissions.
Overseas business sites	number of certifications	14	14	14

Idemitsu Kosan, consolidated refining companies (Toa and Yokkaichi) and major consolidated companies
Past fiscal year data corrections have been reflected.
Idemitsu Gas Production (Vietnam) Co.,Ltd.
Muswellbrook Coal Co., Ltd., Boggabri Coal Pty. Ltd.
Hokkaido Refinery, Chiba Complex (oil), Aichi Complex TOA Oil Co., Showa Yokkaichi Sekiyu Co.
Chiba Complex (Chemicals), Tokuyama Complex
Hokkaido Refinery, Chiba Complex, Aichi Complex, Tokuyama Complex, TOA Oil Co., Showa Yokkaichi Sekiyu Co. and major consolidated companies
Chiba Complex, Aichi Complex, Tokuyama Complex, TOA Oil Co., Showa Yokkaichi Sekiyu Co. and major consolidated companies
Hokkaido Refinery, Chiba Complex, Aichi Aichi Complex, Tokuyama Complex, TOA Oil Co., Showa Yokkaichi Sekiyu Co.
Idemitsu Kosan
Idemitsu Kosan and major affiliated companies

Refineries/Complexes

Hokkaido Refinery	Unit	FY2023	FY2024	FY2025
Crude oil throughput	Thousand kL	6,956	5,038	7,001
Energy consumption (crude oil equivalent)	Thousand kL ^*1	509	397	520
Unit energy consumption	kL/Thousand kL ^*2	8.80	9.16	8.55
Seawater	Thousand tons	149,238	107,337	116,779
Industrial water	Thousand tons	13,022	13,752	13,072
Tap water	Thousand tons	66	83	80
Underground water	Thousand tons	73	0	0
CO₂ emissions	Thousand t-CO₂	1,518	1,183	1,511
SOx emissions	t	1,555	1,549	1,609
NOx emissions	t	1,180	931	1,223
Soot/dust	t	2	8	24
Wastewater	Thousand kL	162,399	121,171	129,931
COD	t	18	19	22
Total nitrogen	t	-	-	-
Total phosphorus	t	-	-	-
Total waste	t	6,691	6,217	7,139
Reduced by intermediate treatment	t	1,717	1,583	1,072
Recycled	t	3,833	3,425	5,151
Final disposal	t	2	1	0

The figure for energy consumption (crude oil equivalent) is calculated by subtracting the amount of by-product energy sold.
Unit energy consumption = Crude oil equivalent (L) / Atmospheric distillation equipment converted throughput (kL)

Chiba Complex	Unit	FY2023	FY2024	FY2025
Crude oil throughput	Thousand kL	9,083	10,242	9,852
Petrochemical product manufacturing (Ethylene equivalent)	Thousand tons	1,423	1,639	1,400
Energy consumption (crude oil equivalent)	Thousand kL ^*1	1,247	1,346	1,327
Unit energy consumption	kL/Thousand kL ^*2	9.18	9.41	9.52
Unit energy consumption	kL/t ^*3	0.35	0.34	0.37
Seawater	Thousand tons	396,939	461,436	478,573
Industrial water	Thousand tons	19,136	20,198	20,765
Tap water	Thousand tons	-	-	-
Underground water	Thousand tons	329	337	308
CO₂ emissions	Thousand t-CO₂	3,069	3,272	3,259
SOx emissions	t	2,715	2,704	2,704
NOx emissions	t	2,128	2,391	2,260
Soot/dust	t	88	75	85
Wastewater	Thousand kL	415,335	480,893	499,008
COD	t	35	34	33
Total nitrogen	t	65	78	72
Total phosphorus	t	0.3	0.3	0.3
Total waste	t	84,807	66,721	77,754
Reduced by intermediate treatment	t	4,729	3,276	3,231
Recycled	t	43,431	28,378	34,653
Final disposal	t	6	5	2

The figure for energy consumption (crude oil equivalent) is calculated by subtracting the amount of by-product energy sold.
Unit energy consumption = Crude oil equivalent (L) / Atmospheric distillation equipment converted throughput (kL)
Unit energy consumption = Crude oil equivalent (L) / Ethylene equivalent production (t)

Aichi Complex	Unit	FY2023	FY2024	FY2025
Crude oil throughput	Thousand kL	7,362	7,917	7,155
Energy consumption (crude oil equivalent)	Thousand kL ^*1	744	770	695
Unit energy consumption	kL/Thousand kL ^*2	9.94	9.14	8.74
Seawater	Thousand tons	242,017	243,279	210,716
Industrial water	Thousand tons	15,462	15,895	15,901
Tap water	Thousand tons	174	178	213
Underground water	Thousand tons	-	-	-
CO₂ emissions	Thousand t-CO₂	2,040	2,153	1,928
SOx emissions	t	940	825	780
NOx emissions	t	1,445	1,451	1,348
Soot/dust	t	49	56	46
Wastewater	Thousand kL	257,652	259,352	226,830
COD	t	16	16	14
Total nitrogen	t	18	27	21
Total phosphorus	t	1.0	1.0	0.9
Total waste	t	66,869	80,244	70,677
Reduced by intermediate treatment	t	43,249	49,646	45,465
Recycled	t	22,036	28,972	23,193
Final disposal	t	65	173	334

The figure for energy consumption (crude oil equivalent) is calculated by subtracting the amount of by-product energy sold.
Unit energy consumption = Crude oil equivalent (L) / Atmospheric distillation equipment converted throughput (kL)

Tokuyama Complex	Unit	FY2023	FY2024	FY2025
Petrochemical product manufacturing (Ethylene equivalent)	Thousand tons	1,714	1,115	1,409
Energy consumption (crude oil equivalent)	Thousand kL ^*1	941	674	809
Unit energy consumption	kL/t ^*2	0.55	0.62	0.59
Seawater	Thousand tons	424,998	348,422	407,753
Industrial water	Thousand tons	5,698	11,220	11,891
Tap water	Thousand tons	195	214	209
Underground water	Thousand tons	-	-	-
CO₂ emissions	Thousand t-CO₂	1,924	1,469	1,715
SOx emissions	t	829	761	885
NOx emissions	t	1,691	1,255	1,564
Soot/dust	t	17	16	11
Wastewater	Thousand kL	430,888	359,853	419,852
COD	t	16	16	23
Total nitrogen	t	16	17	16
Total phosphorus	t	0.7	0.7	0.7
Total waste	t	37,535	29,327	39,227
Reduced by intermediate treatment	t	18,478	12,767	21,258
Recycled	t	17,224	16,054	17,970
Final disposal	t	1,833	507	0

The figure for energy consumption (crude oil equivalent) is calculated by subtracting the amount of by-product energy sold.
Unit energy consumption = Crude oil equivalent (L) / Ethylene equivalent production (t)

Society

・データの集計対象範囲は、出光興産本体です。一部のデータについて報告対象範囲が異なりますので、詳細については、各データの備考欄をご参照ください。
・✔を付した2025年度のデータは、第三者機関による保証を受けています。

Status of Employees *As of March 31, 2026			Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
Number of employees (combined number of members and employees in managerial positions)			People	4,960	5,060	6,140	✔	Employees, seniors (full-time), incoming seconded employees, including employees seconded to other companies
		Men	People	4,256	4,372	5,300	✔
		Women	People	704	688	840	✔
		Percentage of women	%	14.2	13.6	13.7	✔
		Foreign nationality	People	29	28	30
		Percentage of foreign nationals	%	0.6	0.6	0.5
		Senior (over 60 years old)	People	595	407	537
		Senior (Over 65 years old)	People	144	127	135
Number of members			People	3,777	4,735	4,690
		Men	People	3,177	4,026	3,929
		Women	People	600	709	761
		Percentage of women	%	15.9	15.0	16.2
Number of employees in managerial positions (managers, general managers)			People	924	1,413	1,450	✔
		Men	People	883	1,349	1,371	✔
		Women	People	41	64	79	✔
		Percentage of women	%	4.4	4.6	5.4	✔
Of the numbers of employees in managerial positions, higher posts than general manager			People	48	78	67
		Men	People	43	73	61
		Women	People	5	5	6
		Percentage of women	%	10.4	6.4	9.0
Of the numbers of employees in managerial positions, lower posts than deputy general manager			People	876	1,335	1,383
		Men	People	840	1,276	1,310
		Women	People	36	59	73
		Percentage of women	%	4.1	4.4	5.3
Number of employees (Consolidated)			People	13,991	13,814	14,392		Idemitsu and consolidated subsidiaries (FY2023: 56 companies, FY2024: 58 companies, FY2025: 60 companies)
Average age			age	41.6	42.0	42.9	✔	Employees, seniors (full-time), incoming seconded employees, including employees seconded to other companies
		Men	age	41.8	42.3	43.4	✔
		Women	age	40.7	40.4	40.0	✔
Average years employed			Year	18.0	17.8	18.6	✔
		Men	Year	18.3	18.2	19.2	✔
		Women	Year	16.6	15.5	14.8	✔
Status of employees with disabilities *As of June 1, 2026		Percentage	%	2.55	2.57	2.58	✔	Idemitsu hires (employees, seniors, full-time contract employees, and advisors). Including employees seconded to other companies, but excluding employees seconded from other companies Based on the calculation method of the Ministry of Health, Labour and Welfare
Status of employees with disabilities *As of June 1, 2026		Number	People	127	135	137
Turnover rate (Including honorable retreat)			%	4.50	3.13	3.75		Idemitsu hires (employees, seniors, full-time contract employees, and advisors) Excluding employees seconded to other companies
Voluntary retirement rate			%	2.22	1.74	2.17
New employee retention rate (Average for those joining the company between 2020 and 2022)			%	88.6	90.4	91.2	✔	Results are from Idemitsu's direct hires Retention rate: Average rate of three-year retention of new graduates in the relevant fiscal years Turnover rate: Average rate of new graduates who voluntarily resigned within three years of employment, excluding company-initiated separations, in the relevant fiscal year
New employee turnover rate (Average for new recruits in 2022)			%	10.6	4.7	10.7	✔
Average wage	Basic wages received by men	Management-level employees	yen/month	693,770	707,400	718,173		Idemitsu hires (employees, part-time employees, senior employees, and contract employees), including employees seconded to other companies
	Basic wages received by men	Staff members	yen/month	354,626	377,902	411,808
	Bonuses received by men	Management-level employees	yen/year	5,387,778	5,240,938	4,631,329
	Bonuses received by men	Staff members	yen/year	2,592,877	2,437,126	2,272,090
	Basic wages received by women	Management-level employees	yen/month	664,054	662,988	684,209
	Basic wages received by women	Staff members	yen/month	331,811	354,872	385,694
	Bonuses received by women	Management-level employees	yen/year	4,738,437	4,625,117	4,093,571
	Bonuses received by women	Staff members	yen/year	2,194,812	2,049,628	1,882,828
Average annual salary (based on total monthly pay and bonuses)			yen/year	9,800,598	9,936,913	9,952,943		Idemitsu hires (employees, seniors (full-time),advisors). Excluding employees seconded to other companies, and employees seconded from incoming seconded employees
Average gender salary gap			％	73.4	76.5	75.9		Ratio of the average annual salary of female employees to that of male employees. Note: There is no gender-based disparity in our compensation system. The gender pay gap primarily reflects differences in the proportion of women in managerial positions and the utilization of reduced working hours arrangements. Among regular employees aged 30, women's salary levels are approximately 90% of those of men. We are committed to reducing the gap through initiatives to increase the representation of women in management and to enhance work-life balance support programs

Status of　Recruitment		Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
New graduate recruitment *Hired in April 2026		People	101	130	148	✔	Results are from Idemitsu Kosan's direct hires(FY2023, FY2024, and FY2025)
New graduate recruitment *Hired in April 2026		People	(63)	(74)	(88)	✔
	Men	People	72	91	105	✔
	Men	People	(38)	(39)	(57)	✔
	Women	People	29	39	43	✔
	Women	People	(25)	(35)	(31)	✔
	Percentage of women	%	28.7	30.0	29.1	✔
	Percentage of women	%	(39.7)	(47.3)	(35.2)	✔
	Foreign nationality	People	0	0	0	✔
	Foreign nationality	People	(0)	(0)	(0)	✔
	Percentage of foreign nationals	%	0.0	0.0	0.0	✔
	Percentage of foreign nationals	%	(0.0)	(0.0)	(0.0)	✔
Career recruitment *Hired in FY2025		People	51	81	72	✔	Direct hires by Idemitsu Kosan Co.,Ltd. from April 1 to March 31
	Women	People	28	25	42
	Percentage of women	%	54.9	30.9	58.3
Female hiring ratio	Percentage of women	%	47.3	38.7	45.6		Results are from Idemitsu's direct hires college graduates or higher (Recruitment of new graduates, and Career) between April 1 and March 31

Work-Life Balance Support Systems and Usage Numbers		Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
Maternity leave	Women	People	26	27	33	✔	Idemitsu hires (employees, including employees seconded to other companies)
Childcare leave		People	198	184	179	✔	Idemitsu hires (employees, including employees seconded to other companies) as of March 31 Includes parental leave for childcare purposes By law, only the Men’s childcare leave acquisition rate is required to be disclosed. We also calculate the childcare leave uptake rate for women using the same methodology applied to men
	Men	People	176	159	150	✔
	Women	People	22	25	29	✔
Rate of employees taking childcare leave^*		%	94	93	97	✔
	Men	%	93	92	98	✔
	Women	%	110	104	90	✔
Rate of employees returning to work after childcare leave		%	100	100	99	✔	Idemitsu hires (employees, including employees seconded to other companies)
	Men	%	100	100	100	✔
	Women	%	100	100	92	✔
Nursing care leave		People	7	7	6	✔
	Men	People	4	5	4	✔
	Women	People	3	2	2	✔
Reduced working hours for parenting		People	61	69	80	✔
	Men	People	4	2	2	✔
	Women	People	57	67	78	✔
Leave to care for sick/injured child		People	257	258	318	✔
	Men	People	137	142	196	✔
	Women	People	120	116	122	✔
Family care leave		People	84	96	106	✔
	Men	People	69	74	79	✔
	Women	People	15	22	27	✔
Telecommuting		People	4,213	4,577	4,131	✔
	Men	People	3,585	3,898	3,433	✔
	Women	People	628	679	698	✔
Self-development leave of absence		People	4	6	3	✔
	Men	People	2	2	1	✔
	Women	People	2	4	2	✔
Volunteer leave of absence		People	0	0	0
	Men	People	0	0	0
	Women	People	0	0	0
Cessation from work by employees whose spouses are transferred to countries abroad		People	8	4	5
	Men	People	0	1	1
	Women	People	8	3	4

時間外勤務、年次有給休暇取得実績 Overtime Work and Annual Paid Leave	Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
Average overtime work hours per employee	hours/month	20.1	21.5	22.9	✔	Idemitsu hires (employees) Excluding those on leave and employees seconded Overtime work excludes managerial employees
Average annual paid leave days taken per employee	Days	17.5	17.2	17.3	✔
Average annual paid leave utilization rate per employee	%	85.4	84.6	85.3	✔

Training Results		Unit	FY2023	FY2024	FY2025	Third partyIndependent Practitioner's Assurance	Note
Training hours	Total	hours	68,252	92,304	90,058	✔	Training programs conducted by the Human Resources Department and the Career Design Department of Idemitsu Kosan Co.,Ltd.
Training hours	Per person	hours	11.8	15.8	15.5	✔
Amount of investment in training	Total	Thousand yen	299,138	318,488	399,663	✔
Amount of investment in training	Per person	Thousand yen	52	55	69	✔

Occupational Safety Performance			Unit	2023	2024	2025	Third partyIndependent Practitioner's Assurance	Note
fatal accident	number of certifications		Cases	0	1	0		Hokkaido Refinery, Chiba Complex (Including Prime Polymer Co., Ltd. Anesaki Works), Aichi Complex, Tokuyama Complex, TOA Oil Co., Ltd.,Keihin Refinery・Mizue Power Plant, Showa Yokkaichi Sekiyu Co., Ltd.Yokkaichi Refinery, Seibu Oil Co., Ltd. Sanyo Onoda Complex ■Employees: Including employee of group refinery companies listed above ■Employee of partner companies: Including employees of Idemitsu Plantec Group [Reporting period] From January to December [Calculation Method] LTIFR= (Number of casualties due to occupational accidents/hours of actual work) ×1,000,000 Severity rate= (Number of lost working days/hours of actual work) ×1,000 TRIFR= (Number of injured due to occupational accidents/hours of actual work)×1,000,000 *The base data of LTIFR and TRIFR is number of People.
	Number	Employee	People	0	0	0	✔
	Number	Employees of partner companies	People	0	1	0	✔
Lost-time injuries (including fatal injuries)	number of certifications		Cases	16	23	10
	Number	Employee	People	4	7	3
	Number	Employees of partner companies	People	12	21	7
Accidents not resulting in lost work time	number of certifications		Cases	29	44	34
	Number	Employee	People	5	17	3
	Number	Employees of partner companies	People	24	27	31
Frequency rate	Employee		-	0.60	1.12	0.49	✔
Frequency rate	Employees of partner companies		-	0.98	1.59	0.53	✔
Severity rate	Employee		-	0.01	0.03	0.01	✔
Severity rate	Employees of partner companies		-	0.04	0.52	0.02	✔
Total frequency rate	Employee		-	1.35	3.84	0.98	✔
Total frequency rate	Employees of partner companies		-	2.72	3.64	2.86	✔

Process Safety Accident Results		Unit	2023	2024	2025	Third partyIndependent Practitioner's Assurance	Note
Serious accidents		Cases	0	0	0	✔	Hokkaido Refinery, Chiba Complex (Including Prime Polymer Co., Ltd. Anesaki Works), Aichi Complex, Tokuyama Complex, TOA Oil Co., Ltd. Keihin Refinery・Mizue Power Plant, Showa Yokkaichi Sekiyu Co., Ltd. Yokkaichi Refinery, Seibu Oil Co., Ltd. Sanyo Onoda Complex [Reporting Period] From January to December

Acquisition Status of ISO 45001 (Occupational Health and Safety Management Systems（OHSMS）)		Unit	As of June 30, 2024	As of June 30, 2025	As of June 30, 2026	third party Warranty CoverageIndependent Practitioner's Assurance	Note
Domestic and overseas business sites		Number of certifications	10	10	9		Decrease at ILC Tianjin Plant

Acquisition Status of ISO 9001(Quality Management Systems)Acquisition status	Unit	As of June 30, 2024	As of June 30, 2025	As of June 30, 2026	third party Warranty Independent Practitioner's Assurance	Note
Domestic and overseas business sites	Number of certifications	29	30	33		Increase at IDEMITSU ADVANCED MATERIALS (MALAYSIA) SDN. BHD., Agro Kanesho Co., Ltd., and Fuji Oil Co., Ltd. Sodegaura Refinery

Results Related to Health		Unit	FY2023	FY2024	FY2025	Note
Periodic medical checkup participation rate		%	100.0	100.0	100.0	[Scope of Reporting] Idemitsu hires, including employees seconded to other companies but excluding employees seconded from other companies and overseas workers
Ratio of employees who underwent follow-up medical checkups		%	91.1	88.0	89.0	[Scope of follow-up medical checkups] Including non-mandatory items
Ratio of employees requiring blood pressure control measures		%	0.1	0.2	0.1	[Calculation criteria] Individuals whose systolic blood pressure is 180mmHg or higher or whose diastolic blood pressure is 110mmHg or higher
Ratio of employees requiring diabetes control measures		%	0.5	0.5	0.6	[Calculation criteria] Individuals with an HbA1c level of 8.0% or higher
Ratio of employees who received health guidance after being diagnosed as high risk		%	97.0	94.1	94.3	[Calculation criteria] Individuals considered as requiring control measures for BMI, blood pressure, ALT/HDL cholesterol, LDL cholesterol, neutral lipid or HbA1c in order to meet Idemitsu’s standards
Ratio of employees who receive ongoing assistance after being diagnosed as high risk		%	70.4	66.9	70.1	[Scope of Reporting] Individuals under Idemitsu hires who are supervised by Head Office's medical office (including employees seconded to other companies but excluding employees seconded from other companies and overseas workers)
Ratio of employees not considered as requiring weight control measures		%	64.8	63.9	63.4	[Calculation criteria] Individuals whose BMI ranges from 18.5 to below 25.0
The result of the medical examination questionnaire	Ratio of employees who smokes	%	20.9	21.5	21.3
	Ratio of employees who maintain exercise habits	%	37.3	38.0	37.4	[Calculation criteria] Individuals who engage in at least 30 minutes of physical exercise twice a week
	Ratio of employees with no sleeping issues inhibiting sufficient rest	%	75.4	72.5	71.8
	Ratio of employees who maintain a regular drinking habit	%	20.2	23.5	25.0	[Calculation criteria] Individuals who habitually drink alcohol in a quantity equivalent to at least 360ml of rice wine on a daily basis or several days a week
	Ratio of employees who eat breakfast	%	73.7	73.5	74.2	[Calculation criteria] Individuals who eat breakfast at least five times a week
Ratio of employees deemed to practice robust self healthcare		%	27.8	26.9	26.9	[Calculation criteria] Individuals with no lifestyle-related issues, such as smoking, a lack of exercise, poor sleeping, a regular drinking habit, or failure to eat breakfast
Ratio of employees who took leave due to mental health issues		%	1.6	2.0	2.3	[Scope of Reporting] Idemitsu hires, including employees seconded to other companies and overseas workers but excluding employees seconded from other companies [Calculation criteria] Individuals who took at least a full month of leave due to mental health issues (two or more rounds of such leave taken within a single fiscal year are counted separately)
Employee stress checks	Participation rate	%	88.0	89.0	89.1	[Scope of Reporting] Idemitsu hires, including overseas workers but excluding employees seconded to other companies and employees seconded from other companies
Employee stress checks	Ratio of employees exposed to a high level of stress	%	7.5	7.4	7.4	[Scope of Reporting] Individuals who underwent stress checks [Criteria for a high level of stress] Based on standards recommended by the Ministry of Health, Labour and Welfare
Presenteeism		%	20.3	20.3	20.7	[Calculation Criteria] A drop degree of the productivity by the aggravation of the mental and physical health condition. The standard uses the University of Tokyo's SPQ
Work Engagement		-	2.6	2.6	2.4	Indicators of positive work-related feelings *The higher the score, the better the condition (maximum: 4 points) Measured using two items (vitality and enthusiasm) in the New Occupational Stress Simple Questionnaire

Governance

・The scope of data is Idemitsu Kosan non-consolidated.

Composition of Executive *As of June 30, 2026		Unit	FY2023	FY2024	FY2025	FY2026
Directors		People	11	10	10	13
	Of the numbers mentioned above, Outside Directors	People	4 (Female 2)	4 (Female 2)	4 (Female 2)	5 (Female:3)
Audit & Supervisory Board Members		People	4	4	4	4
	Of the numbers mentioned above, Outside Audit & Supervisory Board Members	People	2	2	2	2

Number of Convened Meetings of the Board of Directors, etc.		Unit	FY2023	FY2024	FY2025
Board of directors	Number of meetings	times	15	15	15
Board of directors	Average rate of attendance	%	99.4	99.1	100
Audit & Supervisory Board	Number of meetings	times	16	16	15
Audit & Supervisory Board	Average rate of attendance	%	100	100	100

Compliance	Unit	FY2024	FY2025	Note
serious compliance violation	Cases	1	0	Idemitsu and affiliated companies
Number of cases of corruption and bribery	Cases	0	0
Number of employee disciplinary actions related to corruption and bribery	Cases	0	0
Tax compliance violations	Cases	0	2	Idemitsu and affiliated companies substantially controlled by Idemitsu (Companies of which Idemitsu holds more than 50% shares except for Astomos Energy Corporation)

information security	Unit	FY2023	FY2024	FY2025	Note
Serious information security violations	Cases	0	0	0	Idemitsu and affiliated companies
Serious violations of personal information	Cases	0	0	0	Idemitsu and affiliated companies

intellectual property		Unit	FY2023	FY2024	FY2025	Note
Number of patent publications	Japan	Cases	192	151	178	Idemitsu Kosan Co., Ltd., Idemitsu Unitech Co., Ltd., IDEMITSU FINE COMPOSITES CO., LTD., Solar Frontier K.K.,Idemitsu NTG Co., Ltd., Idemitsu Engineering Co., Ltd., IDEMITSU CREDIT CO., LTD., IDEMITSU Retail Marketing Co., Ltd.,SDS Biotech K.K.
Number of patent publications	Overseas	Cases	169	130	131
Number of registered patents held	Japan	Cases	1,942	1,984	1,913
Number of registered patents held	Overseas	Cases	3,599	3,791	3,825

Independent Assurance Report

Independent Assurance Report is available here (PDF: 7.60MB)

Idemitsu ESG Data

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