Black Hills Corp /SD/ SEC filings BKH
Black Hills Corp /SD/ has 1,001 filings in SEC EDGAR's recent list, going back to Aug 4, 2016. Its latest annual report, Form ARS, was filed on Mar 18, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 6, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Nov 4, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 424B5 | Prospectus supplement | May 19, 2026 | — |
| S-3ASR | Automatic shelf registration | May 19, 2026 | — |
| 424B3 | Prospectus | Feb 6, 2026 | — |
| S-4 | Registration for a merger or exchange | Jan 30, 2026 | — |
| 424B2 | Prospectus | Sep 26, 2025 | — |
| FWP | Free writing prospectus | Sep 25, 2025 | — |
| 424B5 | Prospectus supplement | Sep 25, 2025 | — |
| 424B5 | Prospectus supplement | May 8, 2025 | — |
| 424B2 | Prospectus | May 14, 2024 | — |
| FWP | Free writing prospectus | May 13, 2024 | — |
| 424B5 | Prospectus supplement | May 13, 2024 | — |
| 424B2 | Prospectus | Sep 7, 2023 | — |
| FWP | Free writing prospectus | Sep 6, 2023 | — |
| 424B5 | Prospectus supplement | Sep 6, 2023 | — |
| 424B5 | Prospectus supplement | Jun 16, 2023 | — |
| S-3ASR | Automatic shelf registration | Jun 16, 2023 | — |
| 424B2 | Prospectus | Mar 3, 2023 | — |
| FWP | Free writing prospectus | Mar 2, 2023 | — |
| 424B5 | Prospectus supplement | Mar 2, 2023 | — |
| S-8 | Employee stock plan registration | May 5, 2022 | — |
| 424B2 | Prospectus | Aug 24, 2021 | — |
| FWP | Free writing prospectus | Aug 23, 2021 | — |
| 424B5 | Prospectus supplement | Aug 23, 2021 | — |
| 424B5 | Prospectus supplement | Aug 4, 2020 | — |
| S-3ASR | Automatic shelf registration | Aug 4, 2020 | — |
| S-3ASR | Automatic shelf registration | Aug 4, 2020 | — |
| 424B2 | Prospectus | Jun 16, 2020 | — |
| FWP | Free writing prospectus | Jun 12, 2020 | — |
| 424B5 | Prospectus supplement | Jun 12, 2020 | — |
| 424B5 | Prospectus supplement | Feb 25, 2020 | — |
| 424B2 | Prospectus | Sep 30, 2019 | — |
| FWP | Free writing prospectus | Sep 26, 2019 | — |
| 424B5 | Prospectus supplement | Sep 26, 2019 | — |
| 424B5 | Prospectus supplement | Aug 16, 2018 | — |
| FWP | Free writing prospectus | Aug 15, 2018 | — |
| 424B5 | Prospectus supplement | Aug 13, 2018 | — |
| 424B5 | Prospectus supplement | Aug 4, 2017 | — |
| S-3ASR | Automatic shelf registration | Aug 4, 2017 | — |
| S-3ASR | Automatic shelf registration | Aug 4, 2017 | — |
| S-8 | Employee stock plan registration | May 5, 2017 | — |
| 424B2 | Prospectus | Aug 11, 2016 | — |
| FWP | Free writing prospectus | Aug 10, 2016 | — |
| 424B5 | Prospectus supplement | Aug 10, 2016 | — |
Showing 43 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Electric Services (SIC 4911)
- Listed as
- BKH (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- SD
- Headquarters
- Rapid City, SD
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1130464
- Former names
- BLACK HILLS HOLDING CORP (until Dec 26, 2000)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.