NorthWestern Energy Group, Inc.

Q: Jun 30 2026

Q: Mar 31 2026

FY: Dec 31 2025

Q: Sep 30 2025

Q: Jun 30 2025

Q: Mar 31 2025

FY: Dec 31 2024

Q: Sep 30 2024

Q: Jun 30 2024

Q: Mar 31 2024

FY: Dec 31 2023

Q: Sep 30 2023

Regulation FD Disclosure

Results of Operations and Financial Condition

Entry into a Material Definitive Agreement

Entry into a Material Definitive Agreement

Regulation FD Disclosure

Regulation FD Disclosure

Regulation FD Disclosure

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Submission of Matters to a Vote of Security Holders

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Regulation FD Disclosure

Entry into a Material Definitive Agreement

Regulation FD Disclosure

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Entry into a Material Definitive Agreement

Regulation FD Disclosure

Entry into a Material Definitive Agreement

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

No description available

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Sullivan Linda G

Edwards Sherina M.

Ide Britt E

Larson Kent T

Goodin David L

Yingling Jeffrey W.

HORSFALL JAN ROBERT

YAZDI MAHVASH

HORSFALL JAN ROBERT

Yingling Jeffrey W.

Sullivan Linda G

Edwards Sherina M.

Larson Kent T

Goodin David L

Ide Britt E

YAZDI MAHVASH

YAZDI MAHVASH

Yingling Jeffrey W.

HORSFALL JAN ROBERT

VANGUARD CAPITAL MANAGEMENT LLC

No description available

Annual Report Scanned (Paper)

Annual Report Scanned (Paper)

1.01,3.03,5.02,5.03,8.01,9.01