NorthWestern Energy Group, Inc. SEC filings NWE
NorthWestern Energy Group, Inc. has 318 filings in SEC EDGAR's recent list, going back to Oct 2, 2023. Its latest annual report, Form 10-K, was filed on Feb 12, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 5, 2026 (results of operations, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 5, 2026 | Nov 4, 2026 |
| 10-Q | Quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 9, 2026 | Sep 9, 2026 |
| 4 | Insider transaction | Aug 6, 2026 | Aug 6, 2026 |
| 4 | Insider transaction | Aug 5, 2026 | Aug 4, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 30, 2026 | Jul 29, 2026 |
| 10-Q | Quarterly report | Jul 30, 2026 | Jun 30, 2026 |
| 4/A | Form 4/a | Jul 13, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jul 13, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jul 13, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jul 13, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jul 13, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jul 13, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jul 13, 2026 | Jul 6, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 22, 2026 | Jun 15, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 2, 2026 | May 27, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 2, 2026 | Jun 2, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
May 27, 2026 | May 27, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
May 18, 2026 | May 18, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 11, 2026 |
| 8-K |
Current report
Shareholder vote results
|
May 5, 2026 | Apr 30, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 30, 2026 | Apr 29, 2026 |
| 10-Q | Quarterly report | Apr 30, 2026 | Mar 31, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 4 | Insider transaction | Apr 7, 2026 | Apr 7, 2026 |
| 4 | Insider transaction | Apr 7, 2026 | Apr 7, 2026 |
| 4 | Insider transaction | Apr 7, 2026 | Apr 7, 2026 |
| 4 | Insider transaction | Apr 7, 2026 | Apr 7, 2026 |
| 4 | Insider transaction | Apr 7, 2026 | Apr 7, 2026 |
| 4 | Insider transaction | Apr 7, 2026 | Apr 7, 2026 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Apr 3, 2026 | Apr 2, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| ANNLRPT | 2025 annual report | Mar 12, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Mar 12, 2026 | — |
| DEF 14A | Proxy statement | Mar 12, 2026 | Apr 30, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 24, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 24, 2026 |
| 8-K |
Current report
Officer or director change
|
Feb 17, 2026 | Feb 11, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 12, 2026 | Feb 11, 2026 |
| 10-K | Annual report | Feb 12, 2026 | Dec 31, 2025 |
| DEFM14A | Filing | Feb 6, 2026 | — |
| 425 | Filing | Feb 6, 2026 | — |
| 4 | Insider transaction | Feb 4, 2026 | Feb 3, 2026 |
| 4 | Insider transaction | Feb 4, 2026 | Feb 3, 2026 |
| 425 | Filing | Jan 30, 2026 | — |
| 4 | Insider transaction | Jan 26, 2026 | Jan 22, 2026 |
| 4 | Insider transaction | Jan 23, 2026 | Jan 22, 2026 |
| 4 | Insider transaction | Jan 23, 2026 | Jan 22, 2026 |
| 4 | Insider transaction | Jan 23, 2026 | Jan 22, 2026 |
| 4 | Insider transaction | Jan 23, 2026 | Jan 22, 2026 |
| 4 | Insider transaction | Jan 23, 2026 | Jan 22, 2026 |
| 4 | Insider transaction | Jan 23, 2026 | Jan 22, 2026 |
| 4 | Insider transaction | Jan 23, 2026 | Jan 22, 2026 |
| 425 | 425 krtv interview transcript | Jan 22, 2026 | — |
| 4 | Insider transaction | Jan 20, 2026 | Jan 15, 2026 |
| 4 | Insider transaction | Jan 20, 2026 | Jan 15, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 425 | 425 sd bill insert january 2026 | Dec 29, 2025 | — |
| 425 | 425 ne bill insert jan 2026 | Dec 29, 2025 | — |
| 425 | 425 mt radio ads 2025 12 29 | Dec 29, 2025 | — |
| 425 | 425 bird the outlet transcript | Dec 23, 2025 | — |
| 4 | Insider transaction | Dec 19, 2025 | Dec 19, 2025 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Dec 9, 2025 | Dec 9, 2025 |
| 425 | 425 employee email re dec mt bill insert | Dec 3, 2025 | — |
| 425 | 425 december 2025 mt customer bill insert | Dec 3, 2025 | — |
| 8-K |
Current report
Material agreement, New debt
|
Nov 13, 2025 | Nov 7, 2025 |
| 425 | 425 mt pbs impact transcript excerpts | Nov 13, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 10, 2025 | Nov 10, 2025 |
| 425 | Filing | Nov 10, 2025 | — |
| 4 | Insider transaction | Nov 5, 2025 | Nov 4, 2025 |
| 4 | Insider transaction | Nov 5, 2025 | Nov 4, 2025 |
| 8-K |
Current report
Officer or director change
|
Oct 31, 2025 | Oct 27, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Oct 30, 2025 | Oct 29, 2025 |
| 10-Q | Quarterly report | Oct 30, 2025 | Sep 30, 2025 |
| 425 | Filing | Oct 28, 2025 | — |
| 425 | Filing | Oct 28, 2025 | — |
| 425 | 425 press release mt merger approval filing | Oct 21, 2025 | — |
| 4 | Insider transaction | Oct 7, 2025 | Oct 6, 2025 |
| 4 | Insider transaction | Oct 7, 2025 | Oct 6, 2025 |
| 4 | Insider transaction | Oct 7, 2025 | Oct 6, 2025 |
| 4 | Insider transaction | Oct 7, 2025 | Oct 6, 2025 |
| 4 | Insider transaction | Oct 7, 2025 | Oct 6, 2025 |
| 4 | Insider transaction | Oct 7, 2025 | Oct 6, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 3, 2025 | Sep 29, 2025 |
| 425 | 425 voices of mt transcript | Sep 22, 2025 | — |
| 425 | 425 b of a interview transcript bird | Sep 11, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Sep 3, 2025 | Sep 3, 2025 |
| 425 | 425 hh transcript | Aug 28, 2025 | — |
| 425 | 425 jh linkedin post | Aug 20, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | 425 nwe supplier business partner | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | 425 regulator elected official | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | 425 nwe people leader toolkit | Aug 19, 2025 | — |
| 425 | 425 nwe people leader cover email | Aug 19, 2025 | — |
| 425 | Filing | Aug 19, 2025 | — |
| 425 | 425 nwe leader comm toolkit | Aug 19, 2025 | — |
| 425 | 425 nwe employee faq | Aug 19, 2025 | — |
| 425 | 425 nwe customer email | Aug 19, 2025 | — |
| 425 | 425 analyst investor courtesy | Aug 19, 2025 | — |
| 425 | 425 nwe employee email | Aug 19, 2025 | — |
| 8-K |
Current report
Material agreement, Officer or director change, Bylaw or fiscal year change, Regulation FD disclosure
|
Aug 19, 2025 | Aug 18, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 19, 2025 | Aug 19, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Aug 4, 2025 | Aug 1, 2025 |
| 4 | Insider transaction | Aug 4, 2025 | Aug 1, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 31, 2025 | Jul 30, 2025 |
| 10-Q | Quarterly report | Jul 31, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 9, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 7, 2025 | Jul 1, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 5, 2025 | Jun 5, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
May 28, 2025 | May 28, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
May 19, 2025 | May 19, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
May 7, 2025 | May 1, 2025 |
| 4 | Insider transaction | May 6, 2025 | May 5, 2025 |
| 4 | Insider transaction | May 5, 2025 | May 2, 2025 |
| 8-K |
Current report
Shareholder vote results
|
May 5, 2025 | Apr 30, 2025 |
| 4 | Insider transaction | May 2, 2025 | May 2, 2025 |
| 144 | Notice of proposed sale | May 2, 2025 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Apr 30, 2025 | Apr 29, 2025 |
| 10-Q | Quarterly report | Apr 30, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 10, 2025 | Apr 10, 2025 |
| 4 | Insider transaction | Apr 7, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 7, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 7, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 7, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 7, 2025 | Apr 4, 2025 |
| 4 | Insider transaction | Apr 7, 2025 | Apr 4, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 3, 2025 | — |
| 8-K |
Current report
Material agreement, New debt
|
Mar 27, 2025 | Mar 21, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 25, 2025 | Mar 25, 2025 |
| ARS | Annual report to shareholders | Mar 12, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Mar 12, 2025 | — |
| DEF 14A | Proxy statement | Mar 12, 2025 | Apr 30, 2025 |
| 4 | Insider transaction | Mar 10, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Mar 10, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Mar 10, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 25, 2025 |
| 144 | Notice of proposed sale | Feb 25, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 13, 2025 | Feb 12, 2025 |
| 10-K | Annual report | Feb 13, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Feb 6, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 6, 2025 | Feb 5, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2025 | — |
| 4 | Insider transaction | Jan 6, 2025 | Jan 6, 2025 |
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Company profile
- Industry
- Electric & Other Services Combined (SIC 4931)
- Listed as
- NWE (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Sioux Falls, SD
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1993004
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.