BLACK HILLS CORP /SD/ — 425 Filings
26 425 filings on record
This page lists all 425 filings submitted to the SEC by BLACK HILLS CORP /SD/ (BKH), sorted by most recent first. Each row links to the full filing on EdgarLookup. BLACK HILLS CORP /SD/ has filed 26 425 documents with the SEC since 2016. To view all SEC filings by BLACK HILLS CORP /SD/, see the full filings list.
All
10-K
10-K/A
10-K405
10-K405/A
10-Q
10-Q/A
11-K
144
25-NSE
3
305B2
35-CERT
4
4/A
424B2
424B3
424B4
424B5
424B7
425
5
8-A12B
8-K
8-K/A
ARS
CERTNYS
CORRESP
DEF 14A
DEFA14A
DEFR14A
DRS
EFFECT
FWP
POSASR
PRE 14A
RW
S-1
S-1/A
S-3
S-3/A
S-3ASR
S-4
S-4/A
S-8
S-8 POS
SC 13G
SC 13G/A
SCHEDULE 13G/A
SE
U-1
U-1/A
U-3A-2
U-6B-2
U-9C-3
U5A
U5A/A
U5B
UPLOAD
| Form | Description | Accession Number | Filed | Period |
|---|---|---|---|---|
| 425 | 425 | 0001193125-26-041172 | Feb 6, 2026 | — |
| 425 | 425 | 0001104659-26-008728 | Jan 30, 2026 | — |
| 425 | 425 | 0001104659-25-108599 | Nov 10, 2025 | — |
| 425 | 425 | 0001104659-25-080299 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080309 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080308 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080307 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080306 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080305 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080303 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080302 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080278 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080320 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080317 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080315 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080314 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080312 | Aug 19, 2025 | — |
| 425 | 425 | 0001104659-25-080311 | Aug 19, 2025 | — |
| 425 | NORTHWESTERN CONFIDENTIALITY AGREEMENT | 0001130464-06-000114 | Feb 8, 2006 | — |
| 425 | PROSPECTUSES AND COMMUNICATIONS RE: BUSINESS COMBINATION TRANSACTIONS | 0001104659-05-059923 | Dec 9, 2005 | — |
| 425 | PROSPECTUSES AND COMMUNICATIONS RE: BUSINESS COMBINATION TRANSACTIONS | 0001104659-05-058143 | Nov 29, 2005 | — |
| 425 | CURRENT REPORT OF MATERIAL EVENTS OR CORPORATE CHANGES | 0001104659-05-057753 | Nov 28, 2005 | — |
| 425 | BHC NORTHWESTERN POSSIBLE MERGER | 0001130464-05-000406 | Nov 25, 2005 | — |
| 425 | SCHEDULE 14A12 | 0001130464-05-000410 | Nov 25, 2005 | — |
| 425 | FORM 425 BHC & MALLON S-4 FILING TO MERGE | 0001130464-02-000043 | Dec 2, 2002 | — |
| 425 | MALLON RESOURCES CORPORATION MERGER NEWS RELEASE | 0001130464-02-000034 | Oct 2, 2002 | — |