7001 MT RUSHMORE RD, RAPID CITY, SD
Reports Strong Financial Results for the First Quarter of 2026, Unaudited Pro Forma Condensed Combined Consolidated Financial Information
Reaffirms 2026 Earnings Guidance, Reports 2026 First-Quarter Results, and Provides Updates on Merger with NorthWestern Energy and Data Center Progress
Shareholders Elect Three Class II Directors at Annual Meeting
Shareholders Approve Merger Proposals
Annual Report to Security Holders
Unaudited Pro Forma Condensed Combined Consolidated Financial Information
Reports 2025 Fourth-Quarter and Full-Year Results and Initiates 2026 Earnings Guidance
Reports 2025 Third-Quarter Results and Reaffirms 2025 Adjusted Earnings Guidance
FY 2024
Q3
Q2
Q1
FY 2023
Prospectus filed pursuant to Rule 424(b)(5)
S-3ASR
Effectiveness Notice
Prospectus filed pursuant to Rule 424(b)(3)
Prospectus Filed Pursuant to Rule 425
S-4
Definitive Proxy Statement
Additional Proxy Materials
Schedule 13G - Ownership Report
Statement of Changes in Beneficial Ownership
Free Writing Prospectus
Automatic Shelf Registration Statement