NorthWestern Corporation
Ownership
Ownership Structure
Who owns NorthWestern Corporation (NWE)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.3% of the shares are freely tradable; institutional investors hold 100.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 13.46 | 8,281,530 | -3.9 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.67 | 3,489,737 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.52 | 2,782,707 | +0.0 | 03/31/2026 |
| State Street Corp | 3.80 | 2,335,081 | -11.5 | 03/31/2026 |
| Geode Capital Management, LLC | 2.75 | 1,694,354 | +4.0 | 03/31/2026 |
| Franklin Templeton Inc | 2.64 | 1,621,967 | +12.9 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.50 | 2,152,867 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.19 | 1,961,500 | +0.5 | 07/31/2026 |
| iShares Russell 2000 ETF | 2.61 | 1,603,983 | -0.6 | 08/31/2026 |
| Vanguard Small Cap Index | 2.30 | 1,414,041 | +0.2 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Sullivan Linda G | Director | 34,586 | 2,396,810 $ | Jul 9, 2026 | direct |
| Yingling Jeffrey W. | Director | 24,349 | 1,687,386 $ | Aug 4, 2026 | direct |
| Yazdi Mahvash | Director | 22,932 | 1,589,188 $ | Jul 6, 2026 | direct |
| Ide Britt E | Director | 15,558 | 1,078,169 $ | Jul 9, 2026 | direct |
| Larson Kent T | Director | 12,041 | 834,441 $ | Jul 9, 2026 | direct |
| Horsfall Jan Robert | Director | 11,670 | 808,731 $ | Aug 6, 2026 | direct |
| Edwards Sherina M. | Director | 9,978 | 691,475 $ | Jul 9, 2026 | direct |
| Goodin David L | Director | 5,624 | 389,743 $ | Jul 9, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 6, 2026 | Horsfall Jan Robert | Director | Other | 524 | 71.62 | 37,529 |
| Aug 4, 2026 | Yingling Jeffrey W. | Director | Other | 524 | 71.62 | 37,529 |
| Jul 9, 2026 | Edwards Sherina M. | Director | Other | 524 | 71.62 | 37,529 |
| Jul 9, 2026 | Ide Britt E | Director | Other | 524 | 71.62 | 37,529 |
| Jul 9, 2026 | Larson Kent T | Director | Other | 524 | 71.62 | 37,529 |
| Jul 9, 2026 | Goodin David L | Director | Other | 524 | 71.62 | 37,529 |
| Jul 9, 2026 | Sullivan Linda G | Director | Other | 768 | 71.62 | 55,004 |
| Jul 6, 2026 | Yazdi Mahvash | Director | Other | 524 | 71.62 | 37,529 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.