NorthWestern Energy Group, Inc.

Regulation FD Disclosure

General form for quarterly reports under Section 13 or 15(d)

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

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G)

Submission of Matters to a Vote of Security Holders

No description available

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

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

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

No description available

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)

Regulation FD Disclosure

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Entry into a Material Definitive Agreement

Written communication about a business combination transaction (Rule 425)

Regulation FD Disclosure

Written communication about a business combination transaction (Rule 425)

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

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

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)

Entry into a Material Definitive Agreement

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Regulation FD Disclosure

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Entry into a Material Definitive Agreement

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Annual Report Scanned (Paper)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Annual Report Scanned (Paper)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

1.01,3.03,5.02,5.03,8.01,9.01

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