Employer with a benefit plan ยท SEC filer
KNIFE RIVER CORPORATION
Also filed as Knife River Holding Co
1150 WEST CENTURY AVENUE, BISMARCK, ND 585065568
EIN
92-1008893
SEC CIK
0001955520
SEC · 2026-08-14
Industry (SIC)
Mining & Quarrying of Nonmetallic Minerals (No Fuels) (1400)
SEC · 2026-08-14
State of incorporation
DE
SEC · 2026-08-14
Ticker
KNF
SEC · 2026-08-14
Latest SEC filing
SCHEDULE 13G/A 2026-08-14
SEC · 2026-08-14
Benefit plan 4, 2024 filing
KNIFE RIVER CORPORATION SALARIED EMPLOYEES' PENSION PLAN
DOL · 2025-09-03
Participants (start of year)
199
DOL · 2025-09-03
Plan features
code 1A1B1I3H
DOL · 2025-09-03
Plan type
Single-employer plan
DOL · 2025-09-03
Business code (NAICS)
237310
DOL · 2025-09-03
Benefit plan 5, 2024 filing
KNIFE RIVER MASTER TRUST
DOL · 2025-09-02
Plan type
Direct filing entity
DOL · 2025-09-02
Benefit plan 501, 2024 filing
KNIFE RIVER CORPORATION HEALTH AND WELFARE BENEFITS PROGRAM
DOL · 2025-07-14
Participants (start of year)
3,395
DOL · 2025-07-14