NorthWestern Energy Group, Inc. — All Filings
277 total filings on record
Public companies registered with the SEC are required to file periodic reports, disclosures, and notices throughout the year. The most important are the 10-K (annual report), 10-Q (quarterly report), and 8-K (material event notice). Use the filters below to narrow by form type.
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10-K
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144
3
4
425
8-K
8-K12G3
ANNLRPT
ARS
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DEFA14A
DEFM14A
S-3ASR
S-8
SC 13G/A
SCHEDULE 13G/A
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| SCHEDULE 13G/A | — | 0000102909-26-001990 | Mar 27, 2026 | — |
| ANNLRPT | 2025 ANNUAL REPORT | 0001993004-26-000022 | Mar 12, 2026 | Dec 31, 2025 |
| DEFA14A | DEFA14A | 0001993004-26-000020 | Mar 12, 2026 | — |
| DEF 14A | DEF 14A | 0001993004-26-000018 | Mar 12, 2026 | Apr 30, 2026 |
| 4 | FORM 4 | 0001522051-26-000006 | Mar 3, 2026 | — |
| 4 | FORM 4 | 0001271670-26-000006 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001960374-26-000006 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001981436-26-000004 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001656678-26-000006 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001522052-26-000006 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001450010-26-000004 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001945750-26-000004 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001335071-26-000006 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001847810-26-000004 | Mar 2, 2026 | Feb 27, 2026 |
| 4 | FORM 4 | 0001271670-26-000004 | Feb 25, 2026 | Feb 24, 2026 |
| 4 | FORM 4 | 0001656678-26-000004 | Feb 25, 2026 | Feb 24, 2026 |
| 4 | FORM 4 | 0001335071-26-000004 | Feb 25, 2026 | Feb 24, 2026 |
| 4 | FORM 4 | 0001522052-26-000004 | Feb 25, 2026 | Feb 24, 2026 |
| 4 | FORM 4 | 0001960374-26-000004 | Feb 25, 2026 | Feb 24, 2026 |
| 4 | FORM 4 | 0001522051-26-000004 | Feb 25, 2026 | Feb 24, 2026 |
| 8-K | 8-K | 0001993004-26-000010 | Feb 17, 2026 | Feb 11, 2026 |
| 8-K | 8-K | 0001993004-26-000008 | Feb 12, 2026 | Feb 11, 2026 |
| 10-K | 10-K | 0001993004-26-000006 | Feb 12, 2026 | Dec 31, 2025 |
| DEFM14A | DEFM14A | 0001104659-26-011567 | Feb 6, 2026 | — |
| 4 | FORM 4 | 0001244563-26-000002 | Feb 4, 2026 | Feb 3, 2026 |
| 4 | FORM 4 | 0001730877-26-000002 | Feb 4, 2026 | Feb 3, 2026 |
| 4 | FORM 4 | 0001450010-26-000002 | Jan 26, 2026 | Jan 22, 2026 |
| 4 | FORM 4 | 0001522052-26-000002 | Jan 23, 2026 | Jan 22, 2026 |
| 4 | FORM 4 | 0001981436-26-000002 | Jan 23, 2026 | Jan 22, 2026 |
| 4 | FORM 4 | 0001656678-26-000002 | Jan 23, 2026 | Jan 22, 2026 |
| 4 | FORM 4 | 0001945750-26-000002 | Jan 23, 2026 | Jan 22, 2026 |
| 4 | FORM 4 | 0001335071-26-000002 | Jan 23, 2026 | Jan 22, 2026 |
| 4 | FORM 4 | 0001847810-26-000002 | Jan 23, 2026 | Jan 22, 2026 |
| 4 | FORM 4 | 0001271670-26-000002 | Jan 23, 2026 | Jan 22, 2026 |
| 425 | 425 KRTV INTERVIEW TRANSCRIPT | 0001993004-26-000002 | Jan 22, 2026 | — |
| 4 | FORM 4 | 0001960374-26-000002 | Jan 20, 2026 | Jan 15, 2026 |
| 4 | FORM 4 | 0001522051-26-000002 | Jan 20, 2026 | Jan 15, 2026 |
| 4 | FORM 4 | 0001931208-26-000002 | Jan 6, 2026 | Jan 2, 2026 |
| 4 | FORM 4 | 0001428704-26-000002 | Jan 6, 2026 | Jan 2, 2026 |
| 4 | FORM 4 | 0001634403-26-000002 | Jan 6, 2026 | Jan 2, 2026 |
| 4 | FORM 4 | 0001530618-26-000002 | Jan 6, 2026 | Jan 2, 2026 |
| 4 | FORM 4 | 0001328106-26-000002 | Jan 6, 2026 | Jan 2, 2026 |
| 4 | FORM 4 | 0001182496-26-000002 | Jan 6, 2026 | Jan 2, 2026 |
| 425 | 425 SD BILL INSERT JANUARY 2026 | 0001993004-25-000212 | Dec 29, 2025 | — |
| 425 | 425 NE BILL INSERT JAN 2026 | 0001993004-25-000211 | Dec 29, 2025 | — |
| 425 | 425 MT RADIO ADS 2025 12 29 | 0001993004-25-000210 | Dec 29, 2025 | — |
| 425 | 425 BIRD THE OUTLET TRANSCRIPT | 0001993004-25-000209 | Dec 23, 2025 | — |
| 4 | FORM 4 | 0001271670-25-000009 | Dec 19, 2025 | — |
| 8-K | 8-K | 0001993004-25-000203 | Dec 9, 2025 | — |
| 425 | 425 EMPLOYEE EMAIL RE DEC MT BILL INSERT | 0001993004-25-000201 | Dec 3, 2025 | — |