Dividend King Utility Sees Market Cap Plummet by 400 Billion in a Day: What Happened?

Black Hills Corp (NYSE: BKH) closed at $68.03 on the New York Stock Exchange on the 8th, plunging 5.76% from the prior session. Trading volume reached 2.249 million shares—approximately three times its 20-day average. With a market capitalization of roughly $5.18 billion, the company saw nearly $280 million in market value wiped out in a single day.

In April, shareholders of Black Hills and Northwestern Energy approved a stock-for-stock merger. In May, Black Hills filed a registration statement to expand its at-the-market (ATM) equity issuance program by up to $183.4 million, strengthening its capital-raising flexibility. Although first-quarter results slightly missed analysts’ estimates, the company reaffirmed its full-year 2026 earnings-per-share guidance and raised its quarterly dividend by $0.703 per share—equivalent to $2.81 annually—maintaining a dividend yield of about 3.8%.

Headquartered in Rapid City, South Dakota, Black Hills is an electric and gas utility serving over 1.3 million customers across eight states, including Arkansas, Colorado and Nebraska. It is recognized as one of the few U.S. “Dividend Kings,” having increased its dividend for more than 50 consecutive years, and remains popular with income-focused investors.