NORTHWESTERN CORPORATION is a South Dakota corporation, registered on December 3, 1923. It is based at 3010 W 69th Street, Sioux Falls, SD, 57108. The company is currently listed as active on the South Dakota register, is registered under company number FB000772 and carries EIN 208276648. Its E-Verify enrollment reports a workforce of 1,000 to 2,499 employees, hiring at 1.0 sites in South Dakota. It operates in natural gas distribution (NAICS 22121). Public records for the company include 1 SoS registration, 4 licenses, 3 federal contracts, 2 E-Verify records, 5 USDOT records and 25 Form 5500 filings. Every fact here is republished from an official public register and traces back to a primary source document.
| Legal entity name | NORTHWESTERN CORPORATION |
|---|---|
| Doing business as | NORTHWESTERN ENERGY |
| Former names | NorthWestern Energy; NORTHWESTERN PUBLIC SERVICE |
| Principal address | 3010 W 69th StreetSioux Falls57108SDUnited States922 E ARMSTRONG, MORRIS, IL, 60450 |
| Registration state | South Dakota |
| Status | Active |
| Formed in | Delaware (foreign registration) |
| Home company | NORTHWESTERN CORPORATION |
| Registered | 3 December 1923 (over 102 years ago) |
| Shareholders |
| BRANDI LAMMI, ownerDANIEL FITZPATRICK, owner |
| Entity type | Corporation |
|---|
| Standing | compliant |
|---|
| Company number | FB000772 |
|---|
| EIN | 208276648 |
|---|
| LEI | 3BPWMBHR1R9SHUN7J795 |
|---|
| Industry | Natural Gas Distribution · NAICS 22121 |
|---|
| Workforce size | 1,000 to 2,499 employees · updated 17 September 2025 |
|---|
| Hiring sites | 1.0 sites in South Dakota |
|---|
| USDOT carrier | USDOT 351798 (+2 more) · 1 power unit · 1 driver · Interstate |
|---|
| Registered agent | C T CORPORATION SYSTEM |
|---|
| Source registry | South Dakota Secretary of State · updated 25 May 2026 |
|---|
| Public records | 1 SoS registration |
|---|
The name “NORTHWESTERN CORPORATION” matches an entry on a sanctions list in the OpenSanctions data (ext_gleif, no_nbim_exclusions, permid, ext_eu_esma_firds). This is a name match only and may reflect a different entity — confirm identity against the underlying record before relying on it.
Direct email, phone, website, address and the contact person are unlocked with a Pro subscription. Create an account to reveal them.
| Est. annual revenue | $1.3B |
|---|---|
| Federal contracts | $494K · 2 awards |
| Total obligated | $494K |
|---|---|
| Awards | 2 |
| Top agency | Department of Justice |
| Action date | Agency | Obligated | |
|---|---|---|---|
| 2008-10-01 | Department of Justice | $241K | |
| 2007-10-01 | Department of Justice | $252K | |
| State | Business name | Filed | Registered agent | Officers | Status | |
|---|---|---|---|---|---|---|
| South DakotaTHIS | NORTHWESTERN CORPORATION | 1923-12-03 | C T CORPORATION SYSTEM | — | Active | |
Filing ID FB000772 Jurisdiction Foreign · CorporationFormed in Delaware Principal address 3010 W 69th Street, Sioux Falls, SD, 57108 Registered agent C T CORPORATION SYSTEM319 S COTEAU ST, PIERRE, SD, 57501-3187 Officers Not reported | ||||||
| Delaware | NORTHWESTERN CORPORATION | 1923-11-27 | THE CORPORATION TRUST COMPANY | — | Unknown | |
| Iowa | NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION | 2023-06-20 | C T CORPORATION SYSTEM | BLEAU LAFAVEDirectorBRIAN B. BIRDOfficer9 more | Active | |
| Iowa | NORTHWESTERN ENERGY GROUP, INC. | 2023-06-27 | C T CORPORATION SYSTEM | JAN R. HORSFALLDirectorBRITT E. IDEDirector8 more | Active | |
| Iowa | NORTHWESTERN CORPORATION | 1977-03-28 | C T CORPORATION SYSTEM | JOHN D. HINESDirectorJEANNE M. VOLDDirector9 more | Active | |
| Montana | NorthWestern Energy Group, Inc. | 2023-06-29 | C T CORPORATION SYSTEM | Timothy P. OlsonOfficerJeffrey B. BerzinaOfficer11 more | Active | |
| Montana | NORTHWESTERN CORPORATION | 2002-09-12 | C T CORPORATION SYSTEM | Emilie NgOfficerJeanne M. VoldDirector, Officer15 more | Active | |
| Montana | NorthWestern Cut Bank Gas LLC | 2024-12-13 | C T CORPORATION SYSTEM | NORTHWESTERN CORPORATIONMember | Active | |
| Montana | NorthWestern Services, LLC | 2025-04-25 | C T CORPORATION SYSTEM | NorthWestern Energy Group, IncMember | Active | |
| Montana | NorthWestern Great Falls Gas LLC | 2024-12-13 | C T CORPORATION SYSTEM | NORTHWESTERN CORPORATIONMember | Active | |
Companies and people linked to NORTHWESTERN CORPORATION in the state registers through shared officers, a shared registered agent, shared filing contacts or a shared address. Service companies file for many unrelated businesses — a shared agent, address or contact alone does not prove affiliation.
company person group former role
Browse the indexed registries by state, or look up any debtor name free, at UCC lien search.
| State | License / ID | Type | Issued | Status | |
|---|---|---|---|---|---|
| — | — | — | — | Unknown | |
| — | — | — | — | Unknown | |
| — | — | — | — | Unknown | |
| — | — | — | — | Unknown | |
| Illinois | 351798 | Interstate carrier | — | Inactive | |
| Montana | 410856 | Interstate carrier | — | Active | |
| South Dakota | 219835 | Interstate carrier | — | Active | |
| Montana | 410856 | Carrier authority (USDOT) | — | Active | |
| South Dakota | 219835 | Carrier authority (USDOT) | — | Active | |
| State | Workforce | Hiring sites | Enrolled | Industry | Status | |
|---|---|---|---|---|---|---|
| South Dakota | 1,000 to 2,499 | 1.0 | 9/17/2025 | UTILITIES (22) | Open | |
| Montana | 1,000 to 2,499 | 1.0 | 9/25/2009 | UTILITIES (22) | Open | |
Employee-benefit plan filings by NORTHWESTERN CORPORATION with the Department of Labor. Employee and revenue figures are modeled estimates derived from retirement-plan participant counts and industry ratios — not official headcount or reported revenue.
| Retirement plan assets | $234.9M |
|---|---|
| Benefit plans | No 401(k) on file |
| Filing history | 2 plan years filed, 2007–2008 |
| Sponsor EIN | 20-8276648 |
| Plan year | Employees (est.) | Participants | Plan assets | Revenue (est.) | 401(k) | |
|---|---|---|---|---|---|---|
| 2008 | — | — | $234.9M | — | Unknown | |
| 2007 | — | — | $320.9M | — | Unknown | |
Matched Form 5500 filing records:
| Plan | Plan year | Participants | EIN | |
|---|---|---|---|---|
| NORTHWESTERN ENERGY 401(K) RETIREMENT SAVINGS PLAN | — | — | — | |
| THE NORTHWESTERN CORPORATION 401(K) PROFIT SHARING PLAN | — | — | — | |
| THE NORTHWESTERN CORPORATION 401(K) PROFIT SHARING PLAN | — | — | — | |
| THE NORTHWESTERN CORPORATION 401(K) PROFIT SHARING PLAN | — | — | — | |
| NORTHWESTERN ENERGY 401(K) RETIREMENT SAVINGS PLAN | — | — | — | |
| NORTHWESTERN ENERGY 401(K) RETIREMENT SAVINGS PLAN | — | — | — | |
| THE NORTHWESTERN CORPORATION 401(K) PROFIT SHARING PLAN | — | — | — | |
| NORTHWESTERN ENERGY 401(K) RETIREMENT SAVINGS PLAN | — | — | — | |
| THE NORTHWESTERN CORPORATION 401(K) PROFIT SHARING PLAN | — | — | — | |
| NORTHWESTERN ENERGY 401(K) RETIREMENT SAVINGS PLAN | — | — | — | |
Federal court records load when you reach this section.
Companies adjacent to NORTHWESTERN CORPORATION in the South Dakota Secretary of State register, in alphabetical order.
6 companies are registered at 3010 W 69th Street, Sioux Falls — shared registered-office and agent addresses are common; a shared address alone does not link businesses.
Netstate aggregates public records from federal, state and municipal sources; records are matched to this company by its registered legal names. Latest source snapshot 2026-06-07. Document getpalm-companies/4417-1250-4951.