Sevenson Environmental Services, Inc.

Form 5500

SEVENSON ENVIRONMENTAL SERVICES, INC.

2749 Lockport Road, Niagara Falls, Ny 14305 (716) 284-0431 EIN:16-0997941 Plan Admin:Lynne D. Mueller

Year	Plan Name	Participants BOY/EOY	Assets BOY/EOY
2023	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN Plan #002 Participants BOY/EOY461 / 541 Assets BOY/EOY$88,543,456 / $105,244,518	2023	SEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN - Plan #002	461 / 541	$88,543,456 / $105,244,518
2023	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN Plan #001 Participants BOY/EOY446 / 524 Assets BOY/EOY$49,372,621 / $56,286,877	2023	SEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN - Plan #001	446 / 524	$49,372,621 / $56,286,877
2023	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN Plan #004 Participants BOY/EOY77 / 73 Assets BOY/EOY$5,712,108 / $6,403,896	2023	SEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN - Plan #004	77 / 73	$5,712,108 / $6,403,896
2023	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC EMPLOYEE BENEFIT PLAN Plan #502 Participants BOY/EOY270 / 0 Assets BOY/EOY$0 / $0	2023	SEVENSON ENVIRONMENTAL SERVICES, INC EMPLOYEE BENEFIT PLAN - Plan #502	270 / 0	$0 / $0
2022	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN Plan #002 Participants BOY/EOY393 / 452 Assets BOY/EOY$109,017,099 / $88,543,456	2022	SEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN - Plan #002	393 / 452	$109,017,099 / $88,543,456
2022	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN Plan #001 Participants BOY/EOY375 / 437 Assets BOY/EOY$57,252,194 / $49,372,621	2022	SEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN - Plan #001	375 / 437	$57,252,194 / $49,372,621
2022	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN Plan #004 Participants BOY/EOY84 / 77 Assets BOY/EOY$7,640,372 / $5,712,108	2022	SEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN - Plan #004	84 / 77	$7,640,372 / $5,712,108
2022	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC EMPLOYEE BENEFIT PLAN Plan #502 Participants BOY/EOY220 / 0 Assets BOY/EOY$0 / $0	2022	SEVENSON ENVIRONMENTAL SERVICES, INC EMPLOYEE BENEFIT PLAN - Plan #502	220 / 0	$0 / $0
2021	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN Plan #002 Participants BOY/EOY378 / 386 Assets BOY/EOY$96,283,874 / $109,017,099	2021	SEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN - Plan #002	378 / 386	$96,283,874 / $109,017,099
2021	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN Plan #001 Participants BOY/EOY365 / 368 Assets BOY/EOY$51,234,459 / $57,252,194	2021	SEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN - Plan #001	365 / 368	$51,234,459 / $57,252,194
2021	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN Plan #004 Participants BOY/EOY92 / 84 Assets BOY/EOY$8,708,173 / $7,640,372	2021	SEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN - Plan #004	92 / 84	$8,708,173 / $7,640,372
2021	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC EMPLOYEE BENEFIT PLAN Plan #502 Participants BOY/EOY228 / 0 Assets BOY/EOY$0 / $0	2021	SEVENSON ENVIRONMENTAL SERVICES, INC EMPLOYEE BENEFIT PLAN - Plan #502	228 / 0	$0 / $0
2020	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN Plan #002 Participants BOY/EOY374 / 373 Assets BOY/EOY$85,952,272 / $96,283,874	2020	SEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN - Plan #002	374 / 373	$85,952,272 / $96,283,874
2020	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN Plan #001 Participants BOY/EOY246 / 360 Assets BOY/EOY$46,598,965 / $51,234,459	2020	SEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN - Plan #001	246 / 360	$46,598,965 / $51,234,459
2020	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN Plan #004 Participants BOY/EOY93 / 92 Assets BOY/EOY$7,507,664 / $8,708,173	2020	SEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN - Plan #004	93 / 92	$7,507,664 / $8,708,173
2020	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. EMPLOYEE BENEFIT PLAN Plan #502 Participants BOY/EOY240 / 0 Assets BOY/EOY$0 / $0	2020	SEVENSON ENVIRONMENTAL SERVICES, INC. EMPLOYEE BENEFIT PLAN - Plan #502	240 / 0	$0 / $0
2019	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN Plan #002 Participants BOY/EOY370 / 372 Assets BOY/EOY$70,806,261 / $85,952,272	2019	SEVENSON ENVIRONMENTAL SERVICES, INC. 401(K) PROFIT SHARING PLAN - Plan #002	370 / 372	$70,806,261 / $85,952,272
2019	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN Plan #001 Participants BOY/EOY254 / 244 Assets BOY/EOY$39,344,776 / $46,598,965	2019	SEVENSON ENVIRONMENTAL SERVICES, INC. PENSION PLAN - Plan #001	254 / 244	$39,344,776 / $46,598,965
2019	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN Plan #004 Participants BOY/EOY101 / 93 Assets BOY/EOY$5,920,033 / $7,507,664	2019	SEVENSON ENVIRONMENTAL SERVICES, INC. PREVAILING WAGE PENSION PLAN - Plan #004	101 / 93	$5,920,033 / $7,507,664
2019	Plan NameSEVENSON ENVIRONMENTAL SERVICES, INC. HEALTHCARE PLAN Plan #502 Participants BOY/EOY241 / 0 Assets BOY/EOY$0 / $0	2019	SEVENSON ENVIRONMENTAL SERVICES, INC. HEALTHCARE PLAN - Plan #502	241 / 0	$0 / $0