Northwestern Energy Group, Inc.

NWE·NASDAQ·$72.44Share Price as of 11/2·$4BMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2607/30/26 10-QQ1 ended 03/31/2604/30/26 10-KFY 202502/12/26 10-QQ3 ended 09/30/2510/30/25 10-QQ2 ended 06/30/2507/31/25

Disclosures

8-KCurrent report09/09/26 8-KCurrent report07/30/26 8-KCurrent report06/22/26 8-KCurrent report06/02/26 8-KCurrent report06/02/26

Prospectuses and Registrations

S-8Registration of securities for employees10/03/23 S-8Registration of securities for employees10/03/23 S-3ASRAutomatic shelf registration10/02/23 S-3ASRAutomatic shelf registration10/02/23

Proxies

DEF 14ADefinitive proxy03/12/26 DEFA14AAdditional proxy materials03/12/26 DEFM14ADefinitive proxy (merger)02/06/26 DEF 14ADefinitive proxy03/12/25 DEFA14AAdditional proxy materials03/12/25

Ownership

Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26 Form 4Insider transaction10/05/26

Other

ANNLRPTANNLRPT03/12/26 42542502/06/26 42542501/30/26 42542501/22/26 42542512/29/25