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Stocks/BKH/SEC Filings/424B5 May 19, 2026

BKH 424B5: Secondary offering

Black Hills Corp

Filed with the SEC on May 19, 2026 · accession 0001104659-26-063508

BKH filed a 424B5 (prospectus (offering)) with the SEC on May 19, 2026. The final terms of an offering of shares or bonds. The stock moved -0.9% by the first close after the filing.

Summary of the filing

Black Hills Corp filed a 424B5 prospectus supplement for a secondary offering of securities under its existing S-3 shelf registration.

For details, click here →How to read a 424B5 →

Key details

IssuerBlack Hills Corp

How BKH stock reacted

Close before

$73.98

May 18, 2026

First close after

-0.93%

$73.29

5 trading days

+1.05%

$74.76

Since filing

+14.40%

$84.63

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Frequently asked questions

What did BKH file with the SEC on May 19, 2026?

BKH filed a 424B5 (Secondary offering). Black Hills Corp filed a 424B5 prospectus supplement for a secondary offering of securities under its existing S-3 shelf registration.

What does a secondary offering mean for BKH stock?

New shares dilute existing holders and are often sold at a discount to the market price.

How do I read a 424B5?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B5 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did BKH stock react to this filing?

BKH closed at $73.98 before the filing and $73.29 on May 19, 2026 (-0.93%). Five trading days later: $74.76 (+1.05%).

Other BKH SEC filings

  • 10-Q · SEC filingNov 5, 2026
  • 8-K · SEC filingNov 4, 2026
  • 8-K · AcquisitionOct 23, 2026
  • 8-K · Contract winOct 6, 2026
  • 8-K · AcquisitionAug 17, 2026
  • 10-Q · SEC filingAug 6, 2026
  • 8-K · SEC filingAug 5, 2026
  • 8-K · AcquisitionMay 15, 2026
  • 10-Q · SEC filingMay 7, 2026
  • 8-K · SEC filingMay 6, 2026

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Source: SEC EDGAR filing 0001104659-26-063508. The summary and key details are extracted by SEPT from the filing and may contain errors. Price reaction uses daily closing prices. Not financial advice.