Soluna Holdings, Inc SEC filings SLNH
Soluna Holdings, Inc has 1,001 filings in SEC EDGAR's recent list, going back to Dec 26, 2007. Its latest annual report, Form ARS, was filed on Aug 24, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 13, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 26, 2026 (regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 27, 2026 | — |
| 3 | Initial insider ownership | Oct 26, 2026 | Oct 16, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 26, 2026 | Oct 26, 2026 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Oct 21, 2026 | Oct 20, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 21, 2026 | Oct 21, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 20, 2026 | Oct 20, 2026 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Oct 19, 2026 | Oct 16, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 28, 2026 | Sep 28, 2026 |
| 4 | Insider transaction | Sep 24, 2026 | Sep 23, 2026 |
| 4 | Insider transaction | Sep 17, 2026 | Sep 1, 2026 |
| 4 | Insider transaction | Sep 17, 2026 | Sep 1, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 14, 2026 | Sep 14, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 9, 2026 | Sep 9, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 8, 2026 | Sep 8, 2026 |
| 4 | Insider transaction | Sep 4, 2026 | Sep 3, 2026 |
| 144 | Notice of proposed sale | Sep 3, 2026 | — |
| 4 | Insider transaction | Sep 1, 2026 | Aug 28, 2026 |
| 4 | Insider transaction | Sep 1, 2026 | Sep 1, 2026 |
| 144 | Notice of proposed sale | Sep 1, 2026 | — |
| 4 | Insider transaction | Aug 31, 2026 | Aug 28, 2026 |
| 4 | Insider transaction | Aug 27, 2026 | Aug 26, 2026 |
| 4 | Insider transaction | Aug 27, 2026 | Aug 25, 2026 |
| 4 | Insider transaction | Aug 25, 2026 | Aug 21, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 25, 2026 | Aug 25, 2026 |
| 4 | Insider transaction | Aug 24, 2026 | Aug 20, 2026 |
| ARS | Annual report to shareholders | Aug 24, 2026 | Dec 31, 2025 |
| DEF 14A | Proxy statement | Aug 24, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 24, 2026 | Aug 24, 2026 |
| 4 | Insider transaction | Aug 21, 2026 | Aug 19, 2026 |
| 144 | Notice of proposed sale | Aug 19, 2026 | — |
| 4 | Insider transaction | Aug 18, 2026 | Aug 17, 2026 |
| PRE 14A | Preliminary proxy statement | Aug 14, 2026 | Dec 31, 2025 |
| 10-Q | Quarterly report | Aug 13, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 13, 2026 | Aug 13, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 5, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 5, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Aug 4, 2026 | Aug 1, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 30, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 30, 2026 | Jul 30, 2026 |
| S-8 | Employee stock plan registration | Jul 28, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Jul 24, 2026 | Jul 9, 2026 |
| 3 | Initial insider ownership | Jul 21, 2026 | Jul 13, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 16, 2026 | Jul 16, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 14, 2026 | Jul 14, 2026 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Jun 25, 2026 | Jun 23, 2026 |
| 4 | Insider transaction | Jun 22, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 144 | Notice of proposed sale | Jun 17, 2026 | — |
| 8-K/A | Amended current report | Jun 17, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Jun 10, 2026 | Jun 8, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jun 9, 2026 | Jun 3, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 1, 2026 | Jun 1, 2026 |
| 144 | Notice of proposed sale | Jun 1, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 26, 2026 | — |
| 4 | Insider transaction | May 22, 2026 | May 21, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
May 20, 2026 | May 19, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 18, 2026 | May 18, 2026 |
| 10-Q | Quarterly report | May 15, 2026 | Mar 31, 2026 |
| 424B3 | Prospectus | May 11, 2026 | — |
| EFFECT | Filing | May 8, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
May 7, 2026 | May 7, 2026 |
| CORRESP | Letter to the SEC | May 6, 2026 | — |
| UPLOAD | Letter from the SEC | May 6, 2026 | — |
| 8-K |
Current report
Other events
|
May 1, 2026 | Apr 30, 2026 |
| S-3 | Shelf registration | Apr 29, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 28, 2026 | Apr 28, 2026 |
| 424B3 | Prospectus | Apr 22, 2026 | — |
| EFFECT | Filing | Apr 21, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 21, 2026 | Apr 21, 2026 |
| 424B3 | Prospectus | Apr 20, 2026 | — |
| EFFECT | Filing | Apr 17, 2026 | — |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Apr 17, 2026 | Apr 15, 2026 |
| CORRESP | Letter to the SEC | Apr 17, 2026 | — |
| UPLOAD | Letter from the SEC | Apr 17, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 16, 2026 | Apr 16, 2026 |
| CORRESP | Letter to the SEC | Apr 15, 2026 | — |
| S-1 | Registration statement | Apr 15, 2026 | — |
| S-3 | Shelf registration | Apr 15, 2026 | — |
| 8-K |
Current report
Listing notice
|
Apr 15, 2026 | Apr 10, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 9, 2026 | Apr 9, 2026 |
| 4 | Insider transaction | Apr 8, 2026 | Apr 6, 2026 |
| S-8 | Employee stock plan registration | Apr 8, 2026 | — |
| UPLOAD | Letter from the SEC | Apr 7, 2026 | — |
| 144 | Notice of proposed sale | Apr 6, 2026 | — |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Apr 3, 2026 | Apr 1, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 2, 2026 | Apr 2, 2026 |
| DRS | Filing | Apr 1, 2026 | — |
| 424B5 | Prospectus supplement | Apr 1, 2026 | — |
| 3 | Initial insider ownership | Apr 1, 2026 | Apr 1, 2026 |
| 8-K |
Current report
Auditor change
|
Mar 31, 2026 | Mar 29, 2026 |
| EFFECT | Filing | Mar 30, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Mar 30, 2026 | Mar 30, 2026 |
| S-3/A | Filing | Mar 30, 2026 | — |
| 10-K | Annual report | Mar 30, 2026 | Dec 31, 2025 |
| CORRESP | Letter to the SEC | Mar 26, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 10, 2026 | Mar 10, 2026 |
| S-3 | Shelf registration | Mar 9, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Feb 17, 2026 | Feb 17, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Feb 12, 2026 | Feb 12, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 11, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Feb 10, 2026 | Feb 10, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Feb 3, 2026 | Feb 3, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jan 20, 2026 | Jan 19, 2026 |
| UPLOAD | Letter from the SEC | Jan 15, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 15, 2026 | Jan 15, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 13, 2026 | Jan 13, 2026 |
| DRS | Filing | Jan 12, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 8, 2026 | Jan 8, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Dec 17, 2025 | Dec 16, 2025 |
| 144 | Notice of proposed sale | Dec 16, 2025 | — |
| 4 | Insider transaction | Dec 15, 2025 | Dec 12, 2025 |
| 4 | Insider transaction | Dec 12, 2025 | Dec 10, 2025 |
| 4 | Insider transaction | Dec 12, 2025 | Dec 10, 2025 |
| 4/A | Filing | Dec 11, 2025 | Dec 1, 2025 |
| 4/A | Filing | Dec 11, 2025 | Dec 1, 2025 |
| 144 | Notice of proposed sale | Dec 11, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 9, 2025 | Dec 9, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 8, 2025 | Dec 8, 2025 |
| 424B5 | Prospectus supplement | Dec 5, 2025 | — |
| 8-K |
Current report
Material agreement, Other events
|
Dec 5, 2025 | Dec 4, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 3, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Dec 2, 2025 | Nov 28, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 21, 2025 | Nov 19, 2025 |
| S-8 | Employee stock plan registration | Nov 21, 2025 | — |
| 144 | Notice of proposed sale | Nov 21, 2025 | — |
| 144 | Notice of proposed sale | Nov 19, 2025 | — |
| 424B3 | Prospectus | Nov 17, 2025 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 17, 2025 | Nov 17, 2025 |
| 10-Q | Quarterly report | Nov 14, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 13, 2025 | Nov 13, 2025 |
| 424B3 | Prospectus | Nov 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 12, 2025 | — |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Nov 10, 2025 | Nov 7, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 7, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 6, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Oct 30, 2025 | Oct 15, 2025 |
| 3 | Initial insider ownership | Oct 30, 2025 | Oct 15, 2025 |
| S-1 | Registration statement | Oct 27, 2025 | — |
| DEFA14A | Additional proxy material | Oct 27, 2025 | — |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Oct 21, 2025 | Oct 15, 2025 |
| DEFA14A | Additional proxy material | Oct 20, 2025 | — |
| S-3/A | Filing | Oct 16, 2025 | — |
| DEF 14A | Proxy statement | Oct 14, 2025 | Oct 14, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 9, 2025 | Oct 9, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 7, 2025 | Oct 7, 2025 |
| 8-K |
Current report
Other events
|
Oct 6, 2025 | Oct 3, 2025 |
| PRE 14A | Preliminary proxy statement | Oct 3, 2025 | Oct 3, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 30, 2025 | Sep 29, 2025 |
| UPLOAD | Letter from the SEC | Sep 29, 2025 | — |
| S-3 | Shelf registration | Sep 26, 2025 | — |
| 8-K |
Current report
Other events
|
Sep 23, 2025 | Sep 23, 2025 |
| 424B5 | Prospectus supplement | Sep 23, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 18, 2025 | — |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Regulation FD disclosure
|
Sep 16, 2025 | Sep 12, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 11, 2025 | Sep 11, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 9, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 4 | Insider transaction | Sep 2, 2025 | Sep 1, 2025 |
| 424B5 | Prospectus supplement | Sep 2, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 26, 2025 | Aug 26, 2025 |
| S-8 | Employee stock plan registration | Aug 22, 2025 | — |
| 8-K |
Current report
Shareholder vote results
|
Aug 20, 2025 | Aug 18, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Aug 15, 2025 | Aug 15, 2025 |
| 10-Q | Quarterly report | Aug 14, 2025 | Jun 30, 2025 |
Showing 200 filings, the most recent 200. 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
- Finance Services (SIC 6199)
- Listed as
- SLNH (Nasdaq), SLNHP (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- NV
- Headquarters
- Albany, NY
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 64463
- Former names
- MECHANICAL TECHNOLOGY INC (until Oct 29, 2021)
Other Finance Services companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.