Subject to Receipt of Satisfactory Final Regulatory Approval and Completion of Proposed Merger, Black Hills Corp. to be Renamed Bright Horizon Energy Corporation with Ticker Symbol “HZN”

Black Hills Corp. and NorthWestern Energy announced plans for the combined company name and ticker symbol pending final regulatory approval. If approved, Black Hills will be renamed Bright Horizon Energy Corporation and trade under ticker 'HZN' on NYSE, with NorthWestern Energy becoming a wholly owned subsidiary. The merger has already received shareholder and most regulatory approvals, with Montana Public Service Commission expected to decide by November 12, 2026.