Company facts
- Industry
- Electric & Other Services Combined
- Headquarters
- Sioux Falls, South Dakota
- Most recent report
- 8-K, filed Sep 9, 2026
- Incorporated
- Delaware
- Filings on record
- 308 filings
- On EDGAR
- CIK 1993004
- Fiscal year ends
- December
- Filer status
- Large accelerated filer
Financials 8 of 12
News 8 of 57
- 8-K Current report on a material event Sep 9, 2026
- 8-K Quarterly results Jul 30, 2026
- 8-K Significant contract Jun 22, 2026
- 8-K Significant contract Jun 2, 2026
- 8-K Current report on a material event Jun 2, 2026
- 8-K Current report on a material event May 27, 2026
- 8-K Current report on a material event May 18, 2026
- 8-K Shareholder vote results May 5, 2026
Prospectuses and Registrations 4
Proxies 7
- DEFA14A Extra proxy material Mar 12, 2026
- DEF 14A Proxy statement for a shareholder vote Mar 12, 2026
- DEFM14A Feb 6, 2026
- DEFA14A Extra proxy material Mar 12, 2025
- DEF 14A Proxy statement for a shareholder vote Mar 12, 2025
- DEFA14A Extra proxy material Mar 6, 2024
- DEF 14A Proxy statement for a shareholder vote Mar 6, 2024
Ownership 8 of 182
- 4 Insider reported a trade Aug 6, 2026
- 4 Insider reported a trade Aug 5, 2026
- 4/A Insider reported a trade, amended Jul 13, 2026
- 4 Insider reported a trade Jul 13, 2026
- 4 Insider reported a trade Jul 13, 2026
- 4 Insider reported a trade Jul 13, 2026
- 4 Insider reported a trade Jul 13, 2026
- 4 Insider reported a trade Jul 13, 2026
Other 8 of 46
Everything here comes from NorthWestern Energy Group, Inc.'s own filings on SEC EDGAR. The filing list is rechecked every hour.