Company: SLNH
Filing Date: 2025-04-18
Form Type: POS AM
Source: 0001641172-25-005429
Chunk: 0

Company: Soluna Holdings, Inc
Filing Date: 2025-04-18
Form: POS AM
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on April 18, 2025</div>

Registration No. 333-282559

<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 1

TO

FORM S-1 REGISTRATION STATEMENT NO. 333-282559

REGISTRATION STATEMENT UNDER

THE SECURITIES ACT OF 1933

SOLUNA HOLDINGS, INC.

(Exact name of registrant as specified in its charter)</div>

| Nevada                          |     |                         7374 |     | 14-1462255            |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -Primary Standard Industrial 
   Classification Code Number |     | -I.R.S. Employer      
 Identification Number |

<div align='center'>325 Washington Avenue Extension

Albany, New York 12205

(516) 216-9257

(Address, including zip code, and telephone number,
including area code, of registrant’s principal executive offices)

John Belizaire

Chief Executive Officer

Soluna Holdings, Inc.

325 Washington Ave Extension

Albany, New York 12205

(516) 216-9257

(Name, address, including zip code, and telephone number,
including area code, of agent for service)

Copies to:

Steven E. Siesser, Esq.

Daniel L. Forman, Esq.

Lowenstein Sandler LLP

1251 Avenue of the Americas

New York, New York 10020

Telephone: (212) 204-8688

Approximate date of commencement of proposed sale to the public:

From time to time, as determined by the Selling Holders,
after this Registration Statement becomes effective.</div>

If any of the securities being registered on this
Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box.
☒

If this Form is filed to register additional securities
for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration
statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant
to Rule 462(c) under the Securities Act, check the following box and list