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AI brief of an SEC Form 8-K · Black Hills (BKH)

Black Hills to combine with NorthWestern Energy in all-stock merger

Neutral Impact 5 of 5 m&a Written later

Black Hills and NorthWestern Energy signed a merger agreement on August 18, 2025, under which NorthWestern would become a wholly owned subsidiary of Black Hills and the combined company would be named NewCo. Black Hills shareholders would own about 56% of the combined company on a fully diluted basis, and the companies expect the deal to close in 12 to 15 months, subject to shareholder and regulatory approvals.

Key points

  • Each NorthWestern share would convert into 0.98 Black Hills shares; the companies cite an implied premium of about 4%.
  • Pro forma market capitalization is about $7.8 billion and combined enterprise value is $15.4 billion, based on August 18, 2025 closing prices.
  • Linn Evans will retire as Black Hills CEO at closing; Brian B. Bird, NorthWestern's CEO, will lead the combined company.
  • Either party would owe a $100 million termination fee in certain circumstances; the agreement can be terminated if closing has not occurred by August 18, 2026, subject to extensions.

The filing

CompanyBlack Hills (BKH)
Form8-K, current report
Filed with the SECAug 19, 2025, 4:22 PM ET
Accession number0001104659-25-080276

Items reported: 1.01 Material Definitive Agreement5.02 Director / Officer Change5.03 Bylaw / Charter Amendment7.01 Regulation FD Disclosure

Read the filing on SEC.gov ↗

Written by AI (Anthropic Claude, claude-haiku-5-5) on Nov 8, 2026, 12:58 AM ET, from the text of the filing and its press-release exhibits only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on August 19, 2025.

Briefs are written by AI from the filing text (each brief's own page names the model) and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the model's reading of the filing for shareholders, not a price forecast. Not investment advice.