ESG data

Environmental

・Please refer to the notes for the scope of reporting for each data.
・Data for fiscal year 2024 marked with a ✔ has been guaranteed by a third party.

By Scope GHG emissions ^*1,3		Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
Scope 1	CO₂	Thousand t-CO₂	13,521	13,080	12,279	✔
	CH₄	Thousand t-CO₂	262	281	67	✔
	HFC	Thousand t-CO₂	0.3	0.3	0.3	✔
	N₂O	Thousand t-CO₂	117	125	99	✔
	SF₆	Thousand t-CO₂	0.1	0.1	0.1	✔
	Total	Thousand t-CO₂	13,900	13,487	12,445	✔	Total 7 GHGs (no use of PFCs, NF₃) converted to carbon dioxide
Scope 2		Thousand t-CO₂	559	473	541	✔
Scope3 (Category11)		Thousand t-CO₂	123,578	117,297	101,507	✔	Use of sold products: Calculated based on coal/natural gas production and fuel/LPG production at refineries and complexes
Scope 1+2		Thousand t-CO₂	14,080	13,553	12,820	✔
Scope 1+2		Thousand t-CO₂e	14,459	13,960	12,986	✔	Total 7 GHGs (no use of PFCs, NF₃) converted to carbon dioxide
Scope 1+2+3		Thousand t-CO₂	137,658	130,850	114,326	✔	Scope3 records category11 (only Independent Practitioner’s Assurance coverage)
Scope 1+2+3		Thousand t-CO₂e	138,038	131,257	114,493	✔	Total 7 GHGs (no use of PFCs, NF₃) converted to carbon dioxide

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

Trends in CO₂ Emissions	Unit	FY2022	FY2023	FY2024	third party Warranty Independent Practitioner's Assurance	Note
Scope 1+2 ^*1	Thousand t-CO₂	14,256	13,553	12,820	✔	This table shows the total emissions that are the basis for calculating CO₂(Scope 1+2) reductions target for FY2030: 46% reduction compared to FY2013.

Trends in CO₂ reduction rate Trends in CO₂ reduction rate	Unit	FY2022	FY2023	FY2024	third party Warranty Independent Practitioner's Assurance	Note
CO₂ reduction rate ^*1	%	10.2	14.6	19.2	✔	Reduction rate for fiscal 2013 emissions

The calculation of CO₂ emissions and reduction rates (2013, 2022-2024) includes Seibu Oil Co. Meanwhile, the calculation of GHG emissions by Scope covers consolidated refineries, etc. as of the reporting year, so the calculation period for Seibu Oil Co. includes the period from June 2022 onwards, after it became a consolidated company.

Carbon Intensity Reduction rate trends ^*1	Unit	FY2023	FY2024	third party Warranty Coverage Independent Practitioner's Assurance	Note
Carbon Intensity reduction rate	％	1.1	0.6	✔	Reduction rate for "Carbon Intensity: 10% reduction by 2030, 50% reduction by 2040 (compared to 2020)"

Scope 3 emissions (Idemitsu Kosan only)		Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
Scope3 ^*	Category 1: Purchased products and services ^*2	Thousand t-CO₂	15,732	15,504	14,718	✔
	Category3: Fuel- and energy-related activities (not included in Scope1 or 2)^*1	Thousand t-CO₂	4,207	2,918	2,378	✔
	Category4: Upstream transportation and distribution	Thousand t-CO₂	2,648	2,509	2,457	✔	Including those included in Scope 1 emissions
	Category11: Use of sold products^*1	Thousand t-CO₂	127,853	123,241	115,985	✔	Use of sold products: Calculated based on the volume of coal, natural gas, fuel and LPG, etc. sold by Idemitsu Kosan Co.,Ltd.
	Category12: End-of-life treatment of sold products^*1	Thousand t-CO₂	5,791	5,843	5,355	✔

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

GHG Emissions perUnit of Production	Unit	FY2022	FY2023	FY2024	third party Warranty Independent Practitioner's Assurance	Note
Natural gas production ^*3	t-CO₂e/boe	0.033	0.025	0.026	✔	Unit: GHG emissions / natural gas production
Coal production ^*4	t-CO₂e /t	0.061	0.066	0.042	✔	Unit: GHG emissions / coal production
Oil refining ^*5	t-CO₂e/bbl	0.036	0.036	0.039	✔	Unit: GHG emissions / refinery throughput
Petrochemical factory ^*6	t-CO₂e /t	0.896	0.977	0.983	✔	Unit: GHG emissions / petrochemicals production (ethylene equivalent)

Energy Consumption	Unit	FY2022	FY2023	FY2024	third party Warranty Independent Practitioner's Assurance	Note
Heat equivalent value ^*1	P.J.	213	208	190	✔
Crude oil equivalent value ^*1	Thousand kL	5,498	5,358	4,892	✔
Energy consumption intensity (Refinery) ^*5	L/kL	8.60	8.85	9.04	✔	Unit: Crude oil equivalent energy consumption (L) / atmospheric distillation equipment converted throughput (kL)
Energy consumption intensity (Petrochemical factory) ^*6	kL/t	0.428	0.459	0.45	✔	Unit: Crude oil equivalent energy consumption (kL) / ethylene equivalent production (t)

Water Resources Water Resources intake/discharge volume ^*1	Unit	FY2022	FY2023	FY2024	third party Warranty Independent Practitioner's Assurance	Note
Seawater intake	Thousand tons	1,351,396	1,324,750	1,285,635	✔
Industrial water intake	Thousand tons	87,649	85,178	94,030	✔
Tap water intake	Thousand tons	2,493	2,375	1,906	✔
Underground water intake	Thousand tons	15,799	15,319	12,700	✔	Undergound water also contains hot water from geothermal power generation.
Total water intake	Thousand tons	1,457,336	1,427,620	1,394,272	✔
Wastewater destination (sea)	Thousand tons	1,351,396	1,324,750	1,285,635
Wastewater destination (other)	Thousand tons	88,799	95,938	102,315		The destination includes reduced water (hot water) used in geothermal power generation.
Wastewater	Thousand tons	1,440,195	1,420,687	1,387,950	✔
Recycling rate	％	94	94	93	✔	The water recycling rate only covers "industrial water." ((1) Industrial water intake: 94,030,000 tons (2) Industrial water usage: 1,404,288,000 tons (3) Industrial water recycling: 1,310,258,000 tons, Water recycling rate = (3)/(2), *(2) = (1) + (3))

Water Withdrawal Rate	Unit	FY2022	FY2023	FY2024	third party Warranty Independent Practitioner's Assurance	Note
Natural gas production ^*3	t/boe	0.647	0.692	0.74	✔	Unit: Water withdrawal / natural gas production
Coal production ^*4	t/t	0.474	0.713	0.32	✔	Unit: Water withdrawal / coal production
Oil refining ^*5	t/bbl	3.224	3.223	3.73	✔	Unit: Water withdrawal / refinery throughput
Petrochemical factory ^*6	t/t	157	171	176	✔	Unit: Water withdrawal / petrochemicals production (ethylene equivalent)

Water Pollution Effects	Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
COD ^*7	t	206	198	174	✔	Laws: Water Pollution Control Law
Total nitrogen ^*8	t	251	222	224	✔
Total phosphorus ^*8	t	4.2	3.9	5.1	✔

Air pollutant emissions ^*10	Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
SOx	t	10,660	10,047	8,287	✔	Laws: Air Pollution Control Act
NOx	t	19,981	21,822	20,451	✔
Soot/dust	t	257	240	215	✔
VOC	t	7,235	6,474	5,904	✔

Waste ^*9	Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
Total waste	t	225,375	242,238	218,202	✔	Total amount of industrial waste and specially controlled industrial waste Laws: Waste Management and Public Cleansing Law
Reduced by intermediate treatment	t	82,554	85,399	77,270	✔
Recycled	t	106,908	115,369	101,714	✔
Final disposal	t	25	1,915	1,125	✔
Final disposal rate	%	0.011	0.791	0.52	✔

Hazardous waste ^*9	Unit	FY2022	FY2023	FY2024	Note
Total waste	t	6,970	14,274	16,420	Specially controlled industrial waste is defined as hazardous waste Related laws and regulations: Waste treatment and cleaning laws
Reduced by intermediate treatment	t	1,693	2,409	628
Recycled	t	5,277	10,032	15,135
Final disposal	t	0	1,833	657
Final disposal rate	%	0.00	12.84	4.00

Non-hazardous waste ^*9	Unit	FY2022	FY2023	FY2024	Note
Total waste	t	218,405	227,964	201,781	Defining industrial waste as non-hazardous waste Related laws and regulations: Waste treatment and cleaning laws
Reduced by intermediate treatment	t	80,861	82,990	76,642
Recycled	t	101,632	105,337	86,579
Final disposal	t	25	82	468
Final disposal rate	%	0.011	0.036	0.23

Amount of fluorocarbon leaked ^*10	Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
	t-CO₂e	586	2,057	352		Fidures based on Fluorocarbon calculation report of Law Concerningthe Discharge and Control of Fluorocarbons

Hokkaido Refinery, Chiba Complex, Aichi Complex, Tokuyama Complex, Lubricants Research Laboratory, Advanced Technology Research Laboratories, Performance Materials Laboratories, Narita hydrogen station, Hakodate oil terminal, Niigata Petroleum Import Terminal

Number of environmental abnormalities ^11 Number of Serious Environmental Incidents^11	Unit	FY2022	FY2023	FY2024	third party Warranty Independent Practitioner's Assurance	Note
	Cases	2	2	4

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, 2023	As of June 30, 2024	2025 As of June 30th	Third partyIndependent Practitioner's Assurance	Note
Domestic business sites	Number of certifications	17	29	13		From the perspective of environmental management, it covers more than 95% of CO₂ emissions.
Overseas business sites	Number of certifications	13	29	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	FY2022	FY2023	FY2024
Crude oil throughput	Thousand kL	5,973	6,956	5,038
Energy consumption (crude oil equivalent)	Thousand kL ^*1	456	509	397
Unit energy consumption	kL/Thousand kL ^*2	8.83	8.80	9.16
Seawater	Thousand tons	135,851	149,238	107,337
Industrial water	Thousand tons	13,105	13,022	13,752
Tap water	Thousand tons	65	66	83
Underground water	Thousand tons	238	73	0
CO₂ emissions	Thousand t-CO₂	1,392	1,518	1,183
SOx emissions	t	1,580	1,555	1,549
NOx emissions	t	1,061	1,180	931
Soot/dust	t	3	2	8
Wastewater	Thousand kL	148,994	162,399	121,171
COD	t	18	18	19
Total nitrogen	t	-	-	-
Total phosphorus	t	-	-	-
Total waste	t	5,911	6,691	6,217
Reduced by intermediate treatment	t	1,387	1,717	1,583
Recycled	t	3,837	3,833	3,425
Final disposal	t	2	2	1

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	FY2022	FY2023	FY2024
Crude oil throughput	Thousand kL	10,660	9,083	10,242
Petrochemical product manufacturing (Ethylene equivalent)	Thousand tons	1,874	1,423	1,639
Energy consumption (crude oil equivalent)	Thousand kL ^*1	1,473	1,247	1,346
Unit energy consumption	kL/Thousand kL ^*2	8.83	9.18	9.41
Unit energy consumption	kL/t ^*3	0.32	0.35	0.34
Seawater	Thousand tons	456,730	396,939	461,436
Industrial water	Thousand tons	19,889	19,136	20,198
Tap water	Thousand tons	-	-	-
Underground water	Thousand tons	343	329	337
CO₂ emissions	Thousand t-CO₂	3,563	3,069	3,272
SOx emissions	t	3,672	2,715	2,704
NOx emissions	t	2,524	2,128	2,391
Soot/dust	t	122	88	75
Wastewater	Thousand kL	475,913	415,335	480,893
COD	t	38	35	34
Total nitrogen	t	65	65	78
Total phosphorus	t	0.3	0.3	0.3
Total waste	t	77,105	84,807	66,721
Reduced by intermediate treatment	t	1,720	4,729	3,276
Recycled	t	41,864	43,431	28,378
Final disposal	t	5	6	5

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	FY2022	FY2023	FY2024
Crude oil throughput	Thousand kL	7,879	7,362	7,917
Energy consumption (crude oil equivalent)	Thousand kL ^*1	702	744	770
Unit energy consumption	kL/Thousand kL ^*2	9.56	9.94	9.14
Seawater	Thousand tons	237,441	242,017	243,279
Industrial water	Thousand tons	13,629	15,462	15,895
Tap water	Thousand tons	165	174	178
Underground water	Thousand tons	-	-	-
CO₂ emissions	Thousand t-CO₂	1,910	2,040	2,153
SOx emissions	t	736	940	825
NOx emissions	t	1,362	1,445	1,451
Soot/dust	t	50	49	56
Wastewater	Thousand kL	251,235	257,652	259,352
COD	t	10	16	16
Total nitrogen	t	10	18	27
Total phosphorus	t	1.2	1.0	1.0
Total waste	t	68,666	66,869	80,244
Reduced by intermediate treatment	t	45,396	43,249	49,646
Recycled	t	21,988	22,036	28,972
Final disposal	t	17	65	173

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	FY2022	FY2023	FY2024
Petrochemical product manufacturing (Ethylene equivalent)	Thousand tons	1,523	1,714	1,115
Energy consumption (crude oil equivalent)	Thousand kL ^*1	861	941	674
Unit energy consumption	kL/t ^*2	0.57	0.55	0.62
Seawater	Thousand tons	396,776	424,998	348,422
Industrial water	Thousand tons	10,159	5,698	11,220
Tap water	Thousand tons	202	195	214
Underground water	Thousand tons	-	-	-
CO₂ emissions	Thousand t-CO₂	1,792	1,924	1,469
SOx emissions	t	812	829	761
NOx emissions	t	1,492	1,691	1,255
Soot/dust	t	14	17	16
Wastewater	Thousand kL	406,139	430,888	359,853
COD	t	16	16	16
Total nitrogen	t	14	16	17
Total phosphorus	t	0.5	0.7	0.7
Total waste	t	28,405	37,535	29,327
Reduced by intermediate treatment	t	17,782	18,478	12,767
Recycled	t	10,623	17,224	16,054
Final disposal	t	0	1,833	507

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)

Emissions and transfers of PRTR-regulated substances (FY2024)

PRTR-No.	CAS No.	Substance name	Unit	合計 / 排出量－大気への排出（標準単位） Total / Discharged amount – Emissions to atmosphere (standard emission intensity)	合計 / 排出量－公共用水域への排出（標準単位） Total/Discharged amount – Emissions to public water bodies (standard emission intensity)	合計 / 移動量－廃棄物（標準単位） Total/Transferred amount – Disposed amount (standard emission intensity)	Total
1	-	Water-soluble compounds of zinc	t	0.0	1.4	0.0	1.4
20	141-43-5	2-aminoethanol	t	0.0	0.0	52.1	51.2
33	1332-21-4	Asbestos	t	0.0	0.0	4.4	4.4
36	78-79-5	Isoprene	t	0.1	0.0	0.0	0.1
53	100-41-4	Ethylbenzene	t	10.5	0.0	0.8	11.3
80	1330-20-7	Xylene (also known as dimethylbenzene)	t	24.1	0.0	1.5	25.6
186	75-09-2	Dichloromethane (also known as methylene chloride)	t	0.2	0.0	14.8	15.0
190	77-73-6	Dicyclopentadiene	t	0.2	0.0	0.0	0.2
232	68-12-2	N,N-dimethylformamide	t	0.0	0.0	29.9	29.9
240	100-42-5	Styrene	t	17.2	0.0	1.1	18.3
243	-	Dioxins	mg-TEQ	0.0	9.1	0.0	9.1
260	1897-45-6	2,4,5,6-tetrachloroisophthalonitrile (also known as chlorothalonil or TPN)	t	0.0	0.0	26.0	26.0
262	127-18-4	Tetrachlorethylene	t	0.0	0.0	1.0	1.0
300	108-88-3	Toluene (also known as methylbenzene)	t	96.3	0.0	17.8	114.1
302	91-20-3	Naphthalene	t	0.1	0.0	1.7	1.8
309	7440-02-0	Nickel compounds	t	0.0	0.0	0.6	0.6
333	302-01-2	hydrazine	t	0.0	0.0	1.9	1.9
349	108-95-2	Phenol	t	0.1	0.0	4.6	4.7
389	112-02-7	Hexadecyltrimethylammonium chloride	t	0.0	11.2	0.0	11.2
392	110-54-3	N-hexane	t	226.7	0.0	8.9	235.5
400	71-43-2	Benzene	t	24.7	0.0	0.0	24.7
412	-	Manganese and its compounds	t	0.0	0.0	9.2	9.2
629	110-82-7	Cyclohexane	t	5.1	0.0	35.5	40.6
661	110-71-4	1,2-Dimethoxyethane	t	0.0	0.0	0.9	0.9
674	-	Tetrahydrofuran	t	0.0	0.0	2.2	2.2
691	-	Trimethylbenzene t	t	3.9	0.0	0.0	3.9
731	142-82-5	Heptane	t	15.6	0.0	2.3	17.8

Scope of Reporting: Idemitsu, consolidated refining companies (TOA Oil Co., Ltd., Showa Yokkaichi Sekiyu Co., Ltd., Seibu Oil Co.,Ltd.) and major consolidated group companies
Chemicals are not listed if the total volume of discharge and transfer is less than 0.1 ton per year.
Figures presented above may not be consistent with the totals since they are rounded off to one decimal place.
PRTR: Act on the Assessment of Releases of Specified Chemical Substances in the Environment and the Promotion of Management Improvement

Society

・The scope of data collection is Idemitsu Kosan itself. The scope of reporting differs for some data, so please refer to the notes section of each data for details.
・Data for fiscal year 2024 marked with a ✔ has been guaranteed by a third party.

Employment status *As of March 31, 2025			Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
Number of employees (combined number of members and employees in managerial positions)			People	4,981	4,960	5,060	✔	[Target of data] Employee, Senior (Full-time), Seconded However, this does not include employees seconded to other companies.
		Men	People	4,316	4,256	4,372	✔
		Women	People	665	704	688	✔
		Percentage of women	%	13.4	14.2	13.6	✔
		Foreign nationality	People	36	29	28
		Percentage of foreign nationals	%	0.7	0.6	0.6
		Senior (over 60 years old)	People	433	595	407
		Senior (Over 65 years old)	People	160	144	127
Number of members			People	4,029	3,777	4,735		[Target of data] Includes full-time employees, seniors (full-time), seconded employees, and employees seconded to other companies
		Men	People	3,397	3,177	4,026
		Women	People	632	600	709
		Percentage of women	%	15.7	15.9	15.0
Number of employees in managerial positions (managers, general managers)			People	952	924	1,413	✔
		Men	People	919	883	1,349	✔
		Women	People	33	41	64	✔
		Percentage of women	%	3.5	4.4	4.6	✔
Of the numbers of employees in managerial positions, higher posts than general manager			People	44	48	78
		Men	People	41	43	73
		Women	People	3	5	5
		Percentage of women	%	6.8	10.4	6.4
Of the numbers of employees in managerial positions, lower posts than deputy general manager			People	908	876	1,335
		Men	People	878	840	1,276
		Women	People	30	36	59
		Percentage of women	%	3.3	4.1	4.4
Average age			age	42.2	41.6	42.0	✔	[Target of data] Employee, Senior (Full-time), Seconded However, this does not include employees seconded to other companies.
		Men	age	42.5	41.8	42.3	✔
		Women	age	40.5	40.7	40.4	✔
Average years employed			Year	18.5	18.0	17.8	✔
		Men	Year	18.9	18.3	18.2	✔
		Women	Year	16.1	16.6	15.5	✔
Average wage	Basic wages received by men	Management-level employees	yen/month	688,951	693,770	707,400		[Target of data] Idemitsu Kosan Co., Ltd. Employment (Employee, Senior, Full-time Contract, Advisor) Includes employees seconded to other companies
	Basic wages received by men	Staff members	yen/month	342,687	354,626	377,902
	Bonuses received by men	Management-level employees	yen/year	5,201,780	5,387,778	5,240,938
	Bonuses received by men	Staff members	yen/year	2,401,878	2,592,877	2,437,126
	Basic wages received by women	Management-level employees	yen/month	664,407	664,054	662,988
	Basic wages received by women	Staff members	yen/month	319,638	331,811	354,872
	Bonuses received by women	Management-level employees	yen/year	4,699,277	4,738,437	4,625,117
	Bonuses received by women	Staff members	yen/year	1,995,833	2,194,812	2,049,628
Average salary (The average of the total monthly salary and bonus)			yen/year	-	9,800,598	9,936,913		[Target of data] Employed by Idemitsu Kosan Co., Ltd. (Employees, Senior Full-time, Advisors) However, excluding those seconded to other companies and those seconded to other companies
Average gender salary gap			％	-	73.4	76.5		Average gender salary gap: The difference between the average salary of male full-pay relevant employees and female full-pay relevant employees. *The gender gap in salary is not considered to stem from the remuneration structures or systems, but rather from factors such as disparities in the grade system. There is no disparity in the remuneration system based on gender, gender identity, or other personal attributes. The observed salary differences are due to variations in the composition of employees by grade. We will work towards ensuring diversity at management levels that is not influenced by characteristics such as gender.
Status of employees with disabilities *As of June 1, 2024		Percentage	%	2.50	2.55	2.57	✔	[Scope of Reporting] Scope of Reporting: 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, 2024		Number	People	125	127	135
Number of employees (Consolidated)			People	14,363	13,991	13,814		[Target of calculation] Idemitsu Kosan and consolidated subsidiaries (63 companies in FY2022, 56 companies in FY2023, 58 companies in FY2024)
Turnover rate (Including honorable retreat)			%	4.22	4.50	3.13		[Scope of Reporting] Idemitsu hires (employees, seniors, full-time contract employees, and advisors) Excluding employees seconded to other companies
Voluntary retirement rate			%	2.29	2.22	1.74
New employee retention rate (Average for those joining the company between 2020 and 2022)			%	89.3	88.6	90.4	✔	[Scope of Reporting] 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 within three years of employment in the relevant fiscal year
New employee turnover rate (Average for new recruits in 2022)			%	10.0	10.6	4.7	✔

Status of　Recruitment		Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
Number of new graduates hired *Recruited in April 2025		People	87	101	130	✔	[Target of data] Idemitsu Kosan's direct employment record. Data in parentheses for fiscal years 2022, 2023, and 2024 are for graduates and above.
Number of new graduates hired *Recruited in April 2025		People	(48)	(63)	(74)	✔
	Men	People	70	72	91	✔
	Men	People	(32)	(38)	(39)	✔
	Women	People	17	29	39	✔
	Women	People	(16)	(25)	(35)	✔
	Percentage of women	%	19.5	28.7	30.0	✔
	Percentage of women	%	(33.3)	(39.7)	(47.3)	✔
	Foreign nationality	People	1	0	0	✔
	Foreign nationality	People	(1)	(0)	(0)	✔
	Percentage of foreign nationals	%	1.1	0	0.0	✔
	Percentage of foreign nationals	%	(2.1)	(0.0)	(0.0)	✔
Career recruitment *Hired in FY2023		People	33	51	81	✔	[Scope of Reporting] Idemitsu Kosan's direct employment records for hires made between April 1 and March 31
	Women	People	-	28	25
	Percentage of women	%	-	54.9	30.9
Female hiring ratio	Percentage of women	%	39.5	47.3	38.7	✔	[Scope of Reporting] 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	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
Maternity leave	Women	People	31	26	27	✔	[Target of data] Idemitsu Kosan Employment (including employees and those seconded to other companies)
Childcare leave		People	168	198	184	✔
	Men	People	142	176	159	✔
	Women	People	26	22	25	✔
Rate of employees taking childcare leave^*		%	86	94	93	✔	[Target of data] Idemitsu Kosan Employment (all employees, including those seconded to other companies) Results as of March 31st *The above includes childcare leave.
	Men	%	84	93	92	✔
	Women	%	96	110	104	✔
Rate of employees returning to work after childcare leave		%	100	100	100	✔	[Target of data] Idemitsu Kosan Employment (including employees and those seconded to other companies)
	Men	%	100	100	100	✔
	Women	%	100	100	100	✔
Nursing care leave		People	8	7	7	✔
	Men	People	7	4	5	✔
	Women	People	1	3	2	✔
Reduced working hours for parenting		People	50	61	69	✔
	Men	People	3	4	2	✔
	Women	People	47	57	67	✔
Leave to care for sick/injured child		People	228	257	258	✔
	Men	People	121	137	142	✔
	Women	People	107	120	116	✔
Family care leave		People	56	84	96	✔
	Men	People	44	69	74	✔
	Women	People	12	15	22	✔
Telecommuting		People	4,592	4,213	4,577	✔
	Men	People	4,033	3,585	3,898	✔
	Women	People	559	628	679	✔
Self-development leave of absence		People	3	4	6	✔
	Men	People	1	2	2	✔
	Women	People	2	2	4	✔
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	10	4
	Men	People	0	0	1
	Women	People	8	10	3

時間外勤務、年次有給休暇取得実績 Overtime Work and Annual Paid Leave	Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
Average overtime work hours per employee	hours/month	20.5	20.1	21.5	✔	[Target of data] Idemitsu Kosan Employment (Employees) However, this does not include employees on leave or on secondment. Overtime work is not available to managers.
Average annual paid leave taken by an employee	Days	16.9	17.5	17.2	✔
Average usage rate of annual paid leave per employee	%	83.0	85.4	84.6	✔

Training Results		Unit	FY2022	FY2023	FY2024	Third partyIndependent Practitioner's Assurance	Note
Training hours	Total	hours	74,722	68,252	92,304	✔	[Target of calculation] Education and training hosted by Idemitsu Kosan alone, the Human Resources Department, and Career Design Department
Training hours	Per person	hours	12.8	11.8	15.8	✔
Amount of investment in training	Total	Thousand yen	247,810	299,138	318,488	✔
Amount of investment in training	Per person	Thousand yen	43	52	55	✔

Occupational Safety Performance			Unit	2022	2023	2024	Third partyIndependent Practitioner's Assurance	Note
fatal accident	number		Cases	0	0	1		Hokkaido Refinery, Chiba Complex (including Prime Polymer Co., Ltd.'s Anesaki Plant), Aichi Complex, Tokuyama Complex, TOA Oil Co., Showa Yokkaichi Sekiyu Co., Seibu Oil Co. ■ Employees: Employees of Idemitsu Kosan Co., Ltd., TOA Oil Co., Showa Yokkaichi Sekiyu Co., Seibu Oil Co., and Prime Polymer Co., Ltd. who work at the bases covered by the above calculations. ■ Employees of partner companies: Employees of Idemitsu Plantech Hokkaido Co., Ltd., Idemitsu Plantech Chiba Co., Ltd., Idemitsu Plantech Aichi Co., Ltd., Idemitsu Plantech Tokuyama Co., Ltd., and employees of partner companies to which the above-mentioned bases subject to the data collection outsource their work. [Data collection period] January to December [Calculation method] Frequency rate = (number of accidents resulting in time off work / total number of actual working hours) x 1,000,000 Severity rate = (total number of work days lost / total number of actual working hours) x 1,000 Total frequency rate = ((Number of accidents resulting in lost workdays + Number of accidents not resulting in lost workdays) / Total actual working hours) x 1,000,000 *Starting this time, the calculation method for frequency rate and total frequency rate has been changed from the number of accidents to the number of victims. [Reason] To more appropriately reflect the actual situation of accidents involving multiple victims.
	Number	Employee	People	0	0	0	✔
	Number	Employees of partner companies	People	0	0	1	✔
Lost-time injuries (including fatal injuries)	number		Cases	6	16	23
	Number	Employee	People	1	4	7
	Number	Employees of partner companies	People	5	12	21
Accidents not resulting in lost work time	number		Cases	34	29	44
	Number	Employee	People	10	5	17
	Number	Employees of partner companies	People	24	24	27
Frequency rate	Employee		-	0.15	0.60	1.12	✔
Frequency rate	Employees of partner companies		-	0.46	0.98	1.59	✔
Severity rate	Employee		-	0.00	0.01	0.03	✔
Severity rate	Employees of partner companies		-	0.02	0.04	0.52	✔
Total frequency rate	Employee		-	1.62	1.35	3.84	✔
Total frequency rate	Employees of partner companies		-	2.66	2.72	3.64	✔

Process Safety Accident Results		Unit	2022	2023	2024	Third partyIndependent Practitioner's Assurance	Note
Serious Process Accident		Cases	0	0	0	✔	[Target of data] Hokkaido Refinery, Chiba Complex (including Prime Polymer Co., Ltd.'s Anesaki Plant), Aichi Complex, Tokuyama Complex, TOA Oil Co., Showa Yokkaichi Sekiyu Co., Seibu Oil Co. [Data collection period] January to December

Acquisition Status of ISO 45001 (Eoccupational Health and Safety Management Systems (OHSMS))		Unit	As of June 30, 2023	As of June 30, 2024	2025 As of June 30th	third party Warranty CoverageIndependent Practitioner's Assurance	Note
Domestic and overseas business sites		Number of certifications	-	10	10

Acquisition Status of ISO 9001(Quality Management Systems)Acquisition status	Unit	As of June 30, 2023	As of June 30, 2024	2025 As of June 30th	third party Warranty Independent Practitioner's Assurance	Note
Domestic and overseas business sites	Number of certifications	32	29	30

Results Related to Health		Unit	FY2022	FY2023	FY2024	Note
Periodic medical checkup participation rate		%	99.9	100.0	100.0	[Number of employees] Idemitsu Kosan employees (including employees seconded to other companies, excluding employees seconded to other companies and employees working overseas)
Ratio of employees who underwent follow-up medical checkups		%	89.0	91.1	88.0	[Scope of follow-up medical checkups] Including non-mandatory items
Ratio of employees requiring blood pressure control measures		%	0.1	0.1	0.2	[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	0.5	[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		%	94.6	97.0	94.1	[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		%	75.2	70.4	66.9	[Number of employees] Employees employed by Idemitsu Kosan (including employees seconded to other companies, excluding employees seconded to other companies and employees working overseas) who are under the jurisdiction of the Head Office Medical Office
Ratio of employees not considered as requiring weight control measures		%	65.2	64.8	63.9	[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	%	20.6	20.9	21.5
	Ratio of employees who maintain exercise habits	%	37.0	37.3	38.0	[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	%	75.9	75.4	72.5
	Ratio of employees who maintain a regular drinking habit	%	17.8	20.2	23.5	[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	%	74.9	73.7	73.5	[Calculation criteria] Individuals who eat breakfast at least five times a week
Ratio of employees deemed to practice robust self healthcare		%	28.0	27.8	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		%	1.7	1.6	2.0	[Count parameters] Employees employed by Idemitsu Kosan (including employees seconded to other companies and employees working overseas, but excluding employees seconded from other companies) [Counting criteria] Employees who are absent for more than one consecutive month due to mental health issues, and those who are absent multiple times within a fiscal year, will be counted each time.
Employee stress checks	Participation rate	%	88.8	88.0	89.0	[Count parameters] Employees employed by Idemitsu Kosan (including those working overseas, excluding those seconded to or accepted from other companies)
Employee stress checks	Ratio of employees exposed to a high level of stress	%	7.8	7.5	7.4	[Scope of Reporting] Individuals who underwent stress checks [High[Criteria for a high level of stress] stress standard] Based on standards recommended by the Ministry of Health, Labour and Welfare
Presenteeism		%	19.2	20.3	20.3	[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 (SPQ).
Work Engagement		％	2.6	2.6	2.6	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, 2024		Unit	FY2022	FY2023	FY2024	FY2025
Directors		People	11	11	10	10
	Of the numbers mentioned above, Outside Directors	People	4 (Female 2)	4 (Female 2)	4 (Female 2)	4 (Female 2)
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	FY2022	FY2023	FY2024
Board of directors	Number of meetings	times	15	15	15
Board of directors	Average rate of attendance	%	99.4	99.4	99.1
Audit & Supervisory Board	Number of meetings	times	16	16	16
Audit & Supervisory Board	Average rate of attendance	%	100	100	100

Compliance	Unit	FY2022	FY2024	Note
serious compliance violation	Cases	2	1	[Scope of Reporting] 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 violation	Cases	0	0	[Scope of Reporting] Idemitsu and affiliated companies substantially controlled by Idemitsu (Companies of which Idemitsu hold more than 50% shares except for Astomos Energy Corporation)

information security	Unit	FY2022	FY2023	FY2024	Note
Serious information security violation	Cases	0	0	0	[Scope of Reporting] Idemitsu and affiliated companies
Serious violations of personal information	Cases	0	0	0	[Scope of Reporting] Idemitsu and affiliated companies

intellectual property		Unit	FY2022	FY2023	FY2024	Note
Number of patents published applications	Japan	Cases	251	192	151	[Target of calculation] Idemitsu Kosan, Idemitsu Unitech Co., Ltd., Idemitsu Fine Composites Co., Ltd., Solar Frontier K.K., Nippon Grease Co., Ltd., Idemitsu Engineering Co., Ltd., Idemitsu Credit Co., Ltd., Idemitsu Retail Sales Co., Ltd., SDS Biotech Co., Ltd.
Number of patents published applications	Overseas	Cases	194	169	130
Number of registered patents held	Japan	Cases	1,975	1,942	1,984
Number of registered patents held	Overseas	Cases	3,599	3,599	3,791

Graph collection

● Resources inputs and environmental impacts of Idemitsu Group business activities in fiscal 2024

*Ratio data may not add up to the total due to rounding.

●CO₂ emissions (Scope1, 2, 3)

* Scope of calculation: Idemitsu Kosan, consolidated refining companies (TOA Oil Co., Showa Yokkaichi Sekiyu Co., Seibu Oil Co.) and major consolidated companies

●CO₂ emissions (Scope1+2)

* Scope of data: Idemitsu Kosan, consolidated refining companies (TOA Oil Co., Showa Yokkaichi Sekiyu Co., Seibu Oil Co.) and major consolidated companies

●Breakdown of waste disposal in FY2023

* The amount of waste generated includes the amount disposed of within the company, so it does not match the total amount of each disposal amount shown in the figure.
*Waste is the total of industrial waste and specially controlled industrial waste.
[Data collection targets] Hokkaido Refinery, Chiba Complex, Aichi Complex, Tokuyama Complex, TOA Oil Co., Showa Yokkaichi Sekiyu Co., Seibu Oil Co.

●Final disposal rate at group refineries

*Waste is the total of industrial waste and specially controlled industrial waste.
[Data collection targets] Hokkaido Refinery, Chiba Complex, Aichi Complex, Tokuyama Complex, TOA Oil Co., Showa Yokkaichi Sekiyu Co., Seibu Oil Co.

●Idemitsu Engagement Index

*Scope of reporting: Idemitsu employees (excludes employees seconded to other companies)

●Female ratio in managerial positions

*Data includes Idemitsu Kosan employees (full-time employees, senior employees, full-time contract employees, and advisors) and employees seconded to other companies.

●Female recruiting ratio

*Scope of reporting: Idemitsu’s direct hires college graduates or higher (Recruitment of new graduates, and Career) between April 1 and March 31

●Male ratio taking childcare leave

* Data collected: Idemitsu Kosan employment (all employees, including those seconded to other companies) as of March 31st
*The above includes childcare leave.

●Investments in training per employee

* Data collected: Idemitsu Kosan employment (all employees, including those seconded to other companies) as of March 31st
*The above includes childcare leave.

●Occupational accidents frequency rate (accident incidence frequency)

●Severity rate (degree of accident severity)

* Data collected from: Hokkaido Refinery, Chiba Complex (Prime Polymer Co., Ltd. Anesaki Plant), Aichi Complex, Tokuyama Complex, TOA Oil Co. Keihin Refinery, TOA Oil Co.
Mizue Power Plant, Showa Yokkaichi Sekiyu Co. Yokkaichi Refinery, Seibu Oil Co. Yamaguchi Refinery (Until 2021, BASF Idemitsu Co., Ltd. was included in Chiba Complex)
Employees: Employees of Idemitsu Kosan Co., Ltd., TOA Oil Co., Showa Yokkaichi Sekiyu Co., Seibu Oil Co., and Prime Polymer Co., Ltd. who work at the bases covered by the above calculations.
Cooperative company staff: Idemitsu Plantec Hokkaido Co., Ltd., Idemitsu Plantec Chiba Co., Ltd., Idemitsu Plantec Aichi Co., Ltd., Idemitsu Plantec Tokuyama Co., Ltd.
Employees and employees of partner companies to which the above-mentioned bases subject to the data collection outsource their work
[Data collection period] January to December
*The average value for all Complex for establishments with 100 or more employees is taken from the Ministry of Health, Labor and Welfare's "2023 Work Accident Trends Survey."

● Composition of Board of Directors and Audit & Supervisory Board

●Number of patent applications (published applications)

●Number of registered patents held

●Value of patents held and percentage of patents with high value (company-wide)

●Value of patents held (OLED, Lithium battery materials businesses)

Independent Assurance Report

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ESG data

Environmental

Refineries/Complexes

Emissions and transfers of PRTR-regulated substances (FY2024)

Society

Governance

Graph collection

Independent Assurance Report

Sustainability

Message from the President

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Idemitsu Group's materiality (key challenges)

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Sustainability
news

Various materials

Sustainability・TOP

Message from the President

Sustainability management

Idemitsu Group's
materiality (important issues)

Environmental

Social

Governance

Sustainability news

Various materials