Form 425 - Prospectuses and communications, business combinations:
SEC Accession No. 0001104659-25-080307
Filing Date
2025-08-19
Accepted
2025-08-19 16:50:00
Documents
1

Document Format Files

Seq Description Document Type Size
1 425 tm2523729d9_425.htm 425 19629
  Complete submission text file 0001104659-25-080307.txt   21379
Mailing Address 7001 MT RUSHMORE RD PO BOX 1400 RAPID SD 57709
Business Address 7001 MT RUSHMORE RD PO BOX 1400 RAPID CITY SD 57709 6057212343
BLACK HILLS CORP /SD/ (Filed by) CIK: 0001130464 (see all company filings)

EIN.: 460458824 | State of Incorp.: SD | Fiscal Year End: 1231
Type: 425
SIC: 4911 Electric Services
(CF Office: 01 Energy & Transportation)

Mailing Address 3010 WEST 69TH STREET SIOUX FALLS SD 57108
Business Address 3010 WEST 69TH STREET SIOUX FALLS SD 57108 605-978-2900
NorthWestern Energy Group, Inc. (Subject) CIK: 0001993004 (see all company filings)

EIN.: 932020320 | State of Incorp.: DE | Fiscal Year End: 1231
Type: 425 | Act: 34 | File No.: 000-56598 | Film No.: 251232591
SIC: 4931 Electric & Other Services Combined
(CF Office: 01 Energy & Transportation)