| Form type | Sec Links | Description | Filing date | Reporting date |
|---|---|---|---|---|
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 13, 2024 | |
| SC 13G/A | Report | Jan 22, 2024 | ||
| SC 13G/A | Report | Mar 8, 2023 | ||
| SC 13G/A | Report | Feb 14, 2023 | ||
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 9, 2023 | |
| SC 13G/A | Report | SC 13G/A | Feb 8, 2023 | |
| SC 13G/A | Report | Jan 23, 2023 | ||
| SC 13G | Report | Feb 14, 2022 | ||
| SC 13G | Report | Feb 10, 2022 | ||
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 9, 2022 | |
| SC 13G/A | Report | SC 13G/A | Feb 4, 2022 | |
| SC 13G/A | Report | Jan 27, 2022 | ||
| SC 13G | Report | Jan 25, 2022 | ||
| SC 13G/A | Report | FILING NORTHWESTERN CORP | Dec 7, 2021 | |
| SC 13G | Report | SC 13G | Feb 11, 2021 | |
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 10, 2021 | |
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 10, 2021 | |
| SC 13G/A | Report | Jan 26, 2021 | ||
| SC 13G | Report | FILING NORTHWESTERN CORP | Jan 15, 2021 | |
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 12, 2020 | |
| SC 13G/A | Report | SC 13G/A | Feb 11, 2020 | |
| SC 13G/A | Report | Feb 4, 2020 | ||
| SC 13G/A | Report | Feb 11, 2019 | ||
| SC 13G | Report | SC 13G | Feb 11, 2019 | |
| SC 13G/A | Report | Jan 31, 2019 | ||
| SC 13G/A | Report | NONE | Jan 7, 2019 | |
| SC 13G/A | Report | Nov 13, 2018 | ||
| SC 13G/A | Report | Feb 9, 2018 | ||
| SC 13G/A | Report | Jan 19, 2018 | ||
| SC 13G | Report | NONE | Jan 10, 2018 | |
| SC 13G/A | Report | Mar 2, 2017 | ||
| SC 13G/A | Report | Feb 13, 2017 | ||
| SC 13G/A | Report | Feb 10, 2017 | ||
| SC 13G/A | Report | Jan 17, 2017 | ||
| SC 13G/A | Report | Feb 16, 2016 | ||
| SC 13G/A | Report | Feb 11, 2016 | ||
| SC 13G/A | Report | NWE AS OF 12/31/2015 | Feb 9, 2016 | |
| SC 13G/A | Report | Jan 8, 2016 | ||
| SC 13G/A | Report | Jul 10, 2015 | ||
| SC 13G/A | Report | NORTHWESTERN AMENDEMENT | Feb 17, 2015 | |
| SC 13G/A | Report | NWE AS OF 12/31/2014 | Feb 11, 2015 | |
| SC 13G/A | Report | Feb 10, 2015 | ||
| SC 13G/A | Report | Jan 15, 2015 | ||
| SC 13G/A | Report | Dec 10, 2014 | ||
| SC 13G | Report | NORTHWESTERN INITIAL | Dec 9, 2014 | |
| SC 13G | Report | NORTHWESTERN CORP 13G | Feb 12, 2014 | |
| SC 13G/A | Report | Feb 12, 2014 | ||
| SC 13G/A | Report | NWE AS OF 12/31/2013 | Feb 10, 2014 | |
| SC 13G/A | Report | Jan 17, 2014 | ||
| SC 13G/A | Report | Jan 10, 2014 | ||
| SC 13G | Report | MUNDER 13G FILING FOR NORTHWESTERN CORPORATION | Feb 13, 2013 | |
| SC 13G/A | Report | NWE AS OF 12/31/12 | Feb 11, 2013 | |
| SC 13G/A | Report | Feb 11, 2013 | ||
| SC 13G | Report | NORTHWESTERN CORPORATION SC 13G | Jan 29, 2013 | |
| SC 13G/A | Report | Jan 11, 2013 | ||
| SC 13G/A | Report | Nov 9, 2012 | ||
| SC 13G/A | Report | MUNDER LIVE FILING FOR NORTHWESTERN CORPORATION | Feb 13, 2012 | |
| SC 13G/A | Report | MUNDER FILING FOR NOTHWESTERN CORPORATION | Feb 13, 2012 | |
| SC 13G/A | Report | Feb 9, 2012 | ||
| SC 13G/A | Report | 12/31/2011 | Feb 8, 2012 | |
| SC 13G/A | Report | Feb 8, 2012 | ||
| SC 13G/A | Report | NORTHWESTERN CORPORATION | Feb 8, 2012 | |
| SC 13G/A | Report | LIVE MUNDER FILING FOR NORTHWESTERN CORP 13-GA | Feb 14, 2011 | |
| SC 13G | Report | Feb 10, 2011 | ||
| SC 13G | Report | NORTHWESTERN CORP | Feb 10, 2011 | |
| SC 13G | Report | NWE AS OF 12/31/10 | Feb 9, 2011 | |
| SC 13G/A | Report | Feb 2, 2011 | ||
| SC 13G/A | Report | Feb 16, 2010 | ||
| SC 13G/A | Report | NORTHWESTERN CORPORATION 13GA MUNDER FILING | Feb 11, 2010 | |
| SC 13G | Report | Jan 29, 2010 |