| Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
|---|---|---|---|---|---|---|
| SC 13G/A | 2024-02-13 | VANGUARD GROUP INC | NORTHWESTERN CORP | 6,780,260 | 11.1% | EDGAR |
| SC 13G/A | 2024-01-22 | BlackRock Inc. | NORTHWESTERN CORP | 9,209,029 | 15.0% | EDGAR |
| SC 13G/A | 2023-03-08 | LAZARD ASSET MANAGEMENT LLC | NORTHWESTERN CORP | 495 | 0.0% | EDGAR |
| SC 13G/A | 2023-02-14 | PRICE T ROWE ASSOCIATES INC /MD/ | NORTHWESTERN CORP | 116,599 | 0.2% | EDGAR |
| SC 13G/A | 2023-02-09 | VANGUARD GROUP INC | NORTHWESTERN CORP | 6,266,775 | 10.8% | EDGAR |
| SC 13G/A | 2023-02-08 | AMERICAN CENTURY INVESTMENT MANAGEMENT INC | NORTHWESTERN CORP | 3,750,620 | 6.5% | EDGAR |
| SC 13G/A | 2023-01-23 | BlackRock Inc. | NORTHWESTERN CORP | 8,761,422 | 15.2% | EDGAR |
| SC 13G | 2022-02-14 | PRICE T ROWE ASSOCIATES INC /MD/ | NORTHWESTERN CORP | 2,833,636 | 5.2% | EDGAR |
| SC 13G | 2022-02-10 | LAZARD ASSET MANAGEMENT LLC | NORTHWESTERN CORP | - | - | EDGAR |
| SC 13G/A | 2022-02-09 | VANGUARD GROUP INC | NORTHWESTERN CORP | 5,525,331 | 10.2% | EDGAR |
| SC 13G/A | 2022-02-04 | AMERICAN CENTURY INVESTMENT MANAGEMENT INC | NORTHWESTERN CORP | 3,721,613 | 6.9% | EDGAR |
| SC 13G/A | 2022-01-27 | BlackRock Inc. | NORTHWESTERN CORP | 8,778,356 | 16.2% | EDGAR |
| SC 13G | 2022-01-25 | BlackRock Inc. | NORTHWESTERN CORP | 8,778,356 | 16.2% | EDGAR |
| SC 13G/A | 2021-12-07 | JPMORGAN CHASE & CO | NORTHWESTERN CORP | 2,353,443 | 4.3% | EDGAR |
| SC 13G | 2021-02-11 | AMERICAN CENTURY INVESTMENT MANAGEMENT INC | NORTHWESTERN CORP | 3,280,890 | 6.5% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | NORTHWESTERN CORP | 5,041,513 | 10.0% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | NORTHWESTERN CORP | 5,066,985 | 10.0% | EDGAR |
| SC 13G/A | 2021-01-26 | BlackRock Inc. | NORTHWESTERN CORP | 7,085,297 | 14.0% | EDGAR |
| SC 13G | 2021-01-15 | JPMORGAN CHASE & CO | NORTHWESTERN CORP | 2,559,366 | 5.0% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | NORTHWESTERN CORP | 5,363,995 | 10.6% | EDGAR |