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| Company Name: | NORTHWESTERN CORPORATION |
| Employer identification number (EIN): | 460172280 |
Additional information about NORTHWESTERN CORPORATION
| Jurisdiction of Incorporation: | |
| Incorporation Date: | |
| Company Identification Number: |
More information about NORTHWESTERN CORPORATION
The following addresses have been detected on the 401k submissions:
| USA Mailing Address | |||||
|---|---|---|---|---|---|
| |||||
| Date first seen: 2010-10-08 | |||||
| Date last seen: 2016-07-20 | |||||
| USA Mailing Address | |||||
|---|---|---|---|---|---|
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| Date first seen: 2007-01-01 | |||||
| Date last seen: 2025-11-23 | |||||
| USA Mailing Address | |||||
|---|---|---|---|---|---|
| |||||
| Date first seen: 2025-07-30 | |||||
| Date last seen: 2025-11-23 | |||||
The following addresses have been found in other jurisdictions:
| Jurisdiction: | Wyoming Corporations Division | ||||
| Address: |
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| Jurisdiction Company ID: | 2006-000521489 | ||||
| Jurisdiction Registration Date: | 2006-09-13 |
| Date | Description |
|---|---|
| 2024-10-07 | 460172280 Change of name detected from NORTHWESTERN CORPORATION DBA NORTHWESTERN ENERGY to NORTHWESTERN CORPORATION |
| 2024-10-07 | 460172280 Change of plan name detected from NORTHWESTERN ENERGY PENSION PLAN to NORTHWESTERN ENERGY MT PENSION PLAN for plan ID 101 |
| 2024-09-10 | 460172280 Change of name detected from NORTHWESTERN CORPORATION DBA NORTHWESTERN ENERGY to NORTHWESTERN CORPORATION |
| 2024-09-10 | 460172280 Change of plan name detected from NORTHWESTERN CORPORATION PENSION PLAN to NORTHWESTERN ENERGY SD/NE PENSION PLAN for plan ID 001 |
| Plan id# | Plan Name | Plan Start Date | Plan Effective Date |
|---|---|---|---|
| 103 | NORTHWESTERN ENERGY 401(K) RETIREMENT SAVINGS PLAN | 2014-01-01 | 1984-01-01 |
| 001 | NORTHWESTERN ENERGY SD/NE PENSION PLAN | 2015-01-01 | 1940-10-01 |
| 104 | NORTHWESTERN ENERGY MASTER RETIREMENT TRUST | 2015-01-01 | 2021-01-01 |
| 504 | NORTHWESTERN CORPORATION FAMILY PROTECTOR BENEFIT PLAN | 2012-07-01 | 1986-07-01 |
| 101 | NORTHWESTERN ENERGY MT PENSION PLAN | 2015-01-01 | 1948-06-01 |
| 530 | NORTHWESTERN ENERGY FLEXIBLE COMPENSATION PLAN | 2016-01-01 | 1987-07-01 |
| 508 | VISION SERVICES PLAN | 2012-01-01 | 1990-07-01 |
| 533 | EMPLOYEE GROUP LONG TERM DISABILITY INSURANCE PLAN | 2012-01-01 | 1967-10-01 |
| 536 | HEALTH BENEFIT PLAN FOR RETIREES AGE 65 OR OLDER OF NORTHWESTERN CORP DBA NORTHWESTERN ENERGY AKA RETIREES MEDICARE SUPPLEMENT PLAN | 2012-01-01 | 1970-05-01 |
| Date | Type of contribution | Contribution | Number of participants/employees | Average contribution per participant | |
|---|---|---|---|---|---|
| 2023-09-12 | Employer Contributions | $ 2,500,000 | 117 | $ 21,368 | |
| 2023-09-12 | Employee Contributions | $ 2,500,000 | 117 | $ 21,368 | |
| 2023-08-11 | Employer Contributions | $ 2,500,000 | 117 | $ 21,368 | |
| 2023-08-11 | Employee Contributions | $ 2,500,000 | 117 | $ 21,368 | |
| 2023-07-14 | Employer Contributions | $ 2,000,000 | 117 | $ 17,094 | |
| 2023-07-14 | Employee Contributions | $ 2,000,000 | 117 | $ 17,094 | |
| 2023-04-14 | Employer Contributions | $ 600,000 | 117 | $ 5,128 | |
| 2023-04-14 | Employee Contributions | $ 600,000 | 117 | $ 5,128 | |
| 2022-09-12 | Employer Contributions | $ 2,500,000 | 1531 | $ 1,633 | |
| 2022-09-12 | Employee Contributions | $ 2,500,000 | 1531 | $ 1,633 | |
| 2022-08-12 | Employer Contributions | $ 2,500,000 | 1531 | $ 1,633 | |
| 2022-08-12 | Employee Contributions | $ 2,500,000 | 1531 | $ 1,633 | |
| 2022-07-15 | Employer Contributions | $ 2,000,000 | 1531 | $ 1,306 | |
| 2022-07-15 | Employee Contributions | $ 2,000,000 | 1531 | $ 1,306 | |
| 2022-04-15 | Employer Contributions | $ 600,000 | 1531 | $ 392 | |
| 2022-04-15 | Employee Contributions | $ 600,000 | 1531 | $ 392 | |
| 2021-08-13 | Employer Contributions | $ 1,234,479 | 139 | $ 8,881 | |
| 2021-08-13 | Employee Contributions | $ 1,234,479 | 139 | $ 8,881 | |
| 2021-07-15 | Employer Contributions | $ 2,538,936 | 139 | $ 18,266 | |
| 2021-07-15 | Employee Contributions | $ 2,538,936 | 139 | $ 18,266 | |
| 2021-04-15 | Employer Contributions | $ 2,538,936 | 139 | $ 18,266 | |
| 2021-04-15 | Employee Contributions | $ 2,538,936 | 139 | $ 18,266 | |
| 2020-08-15 | Employer Contributions | $ 1,614,439 | 1538 | $ 1,050 | |
| 2020-08-15 | Employee Contributions | $ 1,614,439 | 1538 | $ 1,050 | |
| 2020-07-15 | Employer Contributions | $ 600,000 | 1538 | $ 390 | |
| 2020-07-15 | Employee Contributions | $ 600,000 | 1538 | $ 390 | |
| 2020-04-15 | Employer Contributions | $ 600,000 | 1538 | $ 390 | |
| 2020-04-15 | Employee Contributions | $ 600,000 | 1538 | $ 390 | |
| 2020-01-15 | Employer Contributions | $ 1,371,888 | 1538 | $ 892 | |
| 2020-01-15 | Employee Contributions | $ 1,371,888 | 1538 | $ 892 | |
| 2019-10-15 | Employer Contributions | $ 3,000,000 | 1530 | $ 1,961 | |
| 2019-10-15 | Employee Contributions | $ 3,000,000 | 1530 | $ 1,961 | |
| 2019-07-15 | Employer Contributions | $ 3,000,000 | 1530 | $ 1,961 | |
| 2019-07-15 | Employee Contributions | $ 3,000,000 | 1530 | $ 1,961 | |
| 2019-04-15 | Employer Contributions | $ 2,915,000 | 1530 | $ 1,905 | |
| 2019-04-15 | Employee Contributions | $ 2,915,000 | 1530 | $ 1,905 | |
| 2018-08-10 | Employer Contributions | $ 600,000 | 1523 | $ 394 | |
| 2018-08-10 | Employee Contributions | $ 600,000 | 1523 | $ 394 | |
| 2018-07-13 | Employer Contributions | $ 600,000 | 1523 | $ 394 | |
| 2018-07-13 | Employee Contributions | $ 600,000 | 1523 | $ 394 | |
| 2017-12-28 | Employer Contributions | $ 1,500,000 | 1545 | $ 971 | |
| 2017-12-28 | Employee Contributions | $ 1,500,000 | 1545 | $ 971 | |
| 2017-08-11 | Employer Contributions | $ 600,000 | 1545 | $ 388 | |
| 2017-08-11 | Employee Contributions | $ 600,000 | 1545 | $ 388 | |
| 2017-07-14 | Employer Contributions | $ 600,000 | 1545 | $ 388 | |
| 2017-07-14 | Employee Contributions | $ 600,000 | 1545 | $ 388 | |
| 2016-12-27 | Employer Contributions | $ 2,500,000 | 749 | $ 3,338 | |
| 2016-12-27 | Employee Contributions | $ 2,500,000 | 749 | $ 3,338 | |
| 2016-08-12 | Employer Contributions | $ 600,000 | 749 | $ 801 | |
| 2016-08-12 | Employee Contributions | $ 600,000 | 749 | $ 801 | |
| 2016-07-15 | Employer Contributions | $ 600,000 | 749 | $ 801 | |
| 2016-07-15 | Employee Contributions | $ 600,000 | 749 | $ 801 | |
| 2015-08-14 | Employer Contributions | $ 600,000 | 233 | $ 2,575 | |
| 2015-08-14 | Employee Contributions | $ 600,000 | 233 | $ 2,575 | |
| 2015-07-17 | Employer Contributions | $ 600,000 | 233 | $ 2,575 | |
| 2015-07-17 | Employee Contributions | $ 600,000 | 233 | $ 2,575 | |
| 2014-05-09 | Employer Contributions | $ 600,000 | 1587 | $ 378 | |
| 2014-05-09 | Employee Contributions | $ 600,000 | 1587 | $ 378 | |
| 2014-04-11 | Employer Contributions | $ 600,000 | 1587 | $ 378 | |
| 2014-04-11 | Employee Contributions | $ 600,000 | 1587 | $ 378 | |
| 2013-12-27 | Employer Contributions | $ 1,500,000 | 861 | $ 1,742 | |
| 2013-12-27 | Employee Contributions | $ 1,500,000 | 861 | $ 1,742 | |
| 2013-07-05 | Employer Contributions | $ 4,500,000 | 861 | $ 5,226 | |
| 2013-07-05 | Employee Contributions | $ 4,500,000 | 861 | $ 5,226 | |
| 2013-06-07 | Employer Contributions | $ 4,500,000 | 861 | $ 5,226 | |
| 2013-06-07 | Employee Contributions | $ 4,500,000 | 861 | $ 5,226 | |
| 2012-06-01 | Employer Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-06-01 | Employee Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-05-04 | Employer Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-05-04 | Employee Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-04-06 | Employer Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-04-06 | Employee Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-03-02 | Employer Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-03-02 | Employee Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-02-03 | Employer Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-02-03 | Employee Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-01-06 | Employer Contributions | $ 200,000 | 267 | $ 749 | |
| 2012-01-06 | Employee Contributions | $ 200,000 | 267 | $ 749 | |
| 2010-06-22 | Employer Contributions | $ 3,000,000 | 1160 | $ 2,586 | |
| 2010-06-22 | Employee Contributions | $ 3,000,000 | 1160 | $ 2,586 | |
| 2010-05-25 | Employer Contributions | $ 500,000 | 1160 | $ 431 | |
| 2010-05-25 | Employee Contributions | $ 500,000 | 1160 | $ 431 | |
| 2010-04-27 | Employer Contributions | $ 500,000 | 1160 | $ 431 | |
| 2010-04-27 | Employee Contributions | $ 500,000 | 1160 | $ 431 | |
| 2009-11-30 | Employer Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-11-30 | Employee Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-11-13 | Employer Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-11-13 | Employee Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-10-30 | Employer Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-10-30 | Employee Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-10-16 | Employer Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-10-16 | Employee Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-10-02 | Employer Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-10-02 | Employee Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-09-18 | Employer Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-09-18 | Employee Contributions | $ 300,000 | 303 | $ 990 | |
| 2009-03-27 | Employer Contributions | $ 700,000 | 303 | $ 2,310 | |
| 2009-03-27 | Employee Contributions | $ 700,000 | 303 | $ 2,310 |
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