Koppers Inc.

Form 5500

KOPPERS INC.

436 Seventh Avenue Ste. 1500, Pittsburgh, Pa 15219 (412) 227-2542 EIN:25-1588399 Plan Admin:Shirley Chabalie

Year	Plan Name	Participants BOY/EOY	Assets BOY/EOY
2022	Plan NameEMPLOYEE SAVINGS PLAN OF KOPPERS INC AND SUBSIDIARIES Plan #001 Participants BOY/EOY1,447 / 1,643 Assets BOY/EOY$187,065,845 / $156,412,191	2022	EMPLOYEE SAVINGS PLAN OF KOPPERS INC AND SUBSIDIARIES - Plan #001	1,447 / 1,643	$187,065,845 / $156,412,191
2022	Plan NameRETIREMENT PLAN FOR KOPPERS INC. Plan #003 Participants BOY/EOY1,236 / 1,212 Assets BOY/EOY$132,793,514 / $93,320,644	2022	RETIREMENT PLAN FOR KOPPERS INC. - Plan #003	1,236 / 1,212	$132,793,514 / $93,320,644
2022	Plan NameKOPPERS INC. SAVINGS PLAN FOR UNION HOURLY EMPLOYEES Plan #004 Participants BOY/EOY709 / 695 Assets BOY/EOY$39,516,978 / $30,920,358	2022	KOPPERS INC. SAVINGS PLAN FOR UNION HOURLY EMPLOYEES - Plan #004	709 / 695	$39,516,978 / $30,920,358
2022	Plan NameKOPPERS HEALTH AND WELFARE PLAN Plan #517 Participants BOY/EOY2,059 / 0 Assets BOY/EOY$0 / $0	2022	KOPPERS HEALTH AND WELFARE PLAN - Plan #517	2,059 / 0	$0 / $0
2021	Plan NameEMPLOYEE SAVINGS PLAN OF KOPPERS INC AND SUBSIDIARIES Plan #001 Participants BOY/EOY1,461 / 1,447 Assets BOY/EOY$162,386,195 / $187,065,845	2021	EMPLOYEE SAVINGS PLAN OF KOPPERS INC AND SUBSIDIARIES - Plan #001	1,461 / 1,447	$162,386,195 / $187,065,845
2021	Plan NameRETIREMENT PLAN FOR KOPPERS INC. Plan #003 Participants BOY/EOY1,253 / 1,236 Assets BOY/EOY$134,977,325 / $132,793,514	2021	RETIREMENT PLAN FOR KOPPERS INC. - Plan #003	1,253 / 1,236	$134,977,325 / $132,793,514
2021	Plan NameKOPPERS INC. SAVINGS PLAN FOR UNION HOURLY EMPLOYEES Plan #004 Participants BOY/EOY701 / 709 Assets BOY/EOY$35,919,429 / $39,516,978	2021	KOPPERS INC. SAVINGS PLAN FOR UNION HOURLY EMPLOYEES - Plan #004	701 / 709	$35,919,429 / $39,516,978
2021	Plan NameKOPPERS HEALTH AND WELFARE PLAN Plan #517 Participants BOY/EOY1,931 / 0 Assets BOY/EOY$0 / $0	2021	KOPPERS HEALTH AND WELFARE PLAN - Plan #517	1,931 / 0	$0 / $0
2020	Plan NameEMPLOYEE SAVINGS PLAN OF KOPPERS INC AND SUBSIDIARIES Plan #001 Participants BOY/EOY1,510 / 1,461 Assets BOY/EOY$134,327,712 / $162,386,195	2020	EMPLOYEE SAVINGS PLAN OF KOPPERS INC AND SUBSIDIARIES - Plan #001	1,510 / 1,461	$134,327,712 / $162,386,195
2020	Plan NameRETIREMENT PLAN FOR KOPPERS INC. Plan #003 Participants BOY/EOY1,268 / 1,253 Assets BOY/EOY$124,220,460 / $134,977,325	2020	RETIREMENT PLAN FOR KOPPERS INC. - Plan #003	1,268 / 1,253	$124,220,460 / $134,977,325
2020	Plan NameKOPPERS INC. SAVINGS PLAN FOR UNION HOURLY EMPLOYEES Plan #004 Participants BOY/EOY778 / 701 Assets BOY/EOY$35,489,702 / $35,919,429	2020	KOPPERS INC. SAVINGS PLAN FOR UNION HOURLY EMPLOYEES - Plan #004	778 / 701	$35,489,702 / $35,919,429
2020	Plan NameKOPPERS HEALTH AND WELFARE PLAN Plan #517 Participants BOY/EOY1,395 / 0 Assets BOY/EOY$0 / $0	2020	KOPPERS HEALTH AND WELFARE PLAN - Plan #517	1,395 / 0	$0 / $0
2019	Plan NameEMPLOYEE SAVINGS PLAN OF KOPPERS INC. AND SUBSIDIARIES Plan #001 Participants BOY/EOY1,545 / 1,510 Assets BOY/EOY$109,265,672 / $134,327,712	2019	EMPLOYEE SAVINGS PLAN OF KOPPERS INC. AND SUBSIDIARIES - Plan #001	1,545 / 1,510	$109,265,672 / $134,327,712
2019	Plan NameRETIREMENT PLAN FOR KOPPERS INC. Plan #003 Participants BOY/EOY1,354 / 1,268 Assets BOY/EOY$107,675,572 / $124,220,460	2019	RETIREMENT PLAN FOR KOPPERS INC. - Plan #003	1,354 / 1,268	$107,675,572 / $124,220,460
2019	Plan NameKOPPERS INC. SAVINGS PLAN FOR UNION HOURLY EMPLOYEES Plan #004 Participants BOY/EOY795 / 778 Assets BOY/EOY$29,954,982 / $35,489,702	2019	KOPPERS INC. SAVINGS PLAN FOR UNION HOURLY EMPLOYEES - Plan #004	795 / 778	$29,954,982 / $35,489,702
2019	Plan NameKOPPERS HEALTH AND WELFARE PLAN Plan #517 Participants BOY/EOY1,472 / 0 Assets BOY/EOY$0 / $0	2019	KOPPERS HEALTH AND WELFARE PLAN - Plan #517	1,472 / 0	$0 / $0