BKH offering history
Every offering-related filing in BLACK HILLS CORP /SD/’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 1,002 filings back to Jul 8, 2016.
| Date | Filing | What it means | |
|---|---|---|---|
| May 19, 2026 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| May 19, 2026 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 6, 2026 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| Feb 6, 2026 | EFFECT → | EFFECTIVE | SEC declared a registration effective — selling can begin |
| Sep 26, 2025 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Sep 25, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Sep 25, 2025 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| May 8, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| May 14, 2024 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| May 13, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| May 13, 2024 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Sep 7, 2023 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Sep 6, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Sep 6, 2023 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Jun 16, 2023 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Jun 16, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 3, 2023 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Mar 2, 2023 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 2, 2023 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Aug 24, 2021 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Aug 23, 2021 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 23, 2021 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Aug 4, 2020 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Aug 4, 2020 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Aug 4, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jun 16, 2020 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Jun 12, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jun 12, 2020 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Feb 25, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Sep 30, 2019 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Sep 26, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Sep 26, 2019 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Aug 16, 2018 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 15, 2018 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Aug 13, 2018 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 4, 2017 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Aug 4, 2017 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Aug 4, 2017 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 11, 2016 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Aug 10, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
Two honest limits. (1) A 424B takedown can price shares or notes— EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.
BKH offering FAQ
When did BKH last execute an offering?
Per SEC filings, BLACK HILLS CORP /SD/'s most recent priced offering document is a 424B5 filed 2026-05-19. Note a 424B takedown can price shares or notes (debt) — the linked document says which.
When did BKH last announce or register an offering?
The most recent registration is a S-3ASR filed 2026-05-19. A registration is capacity to sell shares — not a sale.
Does an offering always mean dilution?
Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.