Company: SLNH
Filing Date: 2025-10-27
Form Type: S-1
Source: 0001493152-25-019770
Chunk: 1

Company: Soluna Holdings, Inc
Filing Date: 2025-10-27
Form: S-1
Chunk 1
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 amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer 
 ☐                       | Accelerated filer ☐       |
| Non-accelerated filer ☒ | Smaller reporting company 
 ☒                         |
|                         | Emerging growth company   
 ☐                         |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

This registration statement shall hereafter become effective in accordance with the provisions of Section 8(a) of the Securities Act of 1933.

The information in this prospectus is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission. These securities may not be sold until the registration statement is effective. This prospectus is not an offer to sell these securities and does not solicit an offer to buy these securities in any state or other jurisdiction where the offer or sale is not permitted.

<div align='center'>Subject to completion, dated October 27, 2025</div>

PRELIMINARY PROSPECTUS

<div align='center'>Soluna Holdings, Inc.

Up to 3,500,000 Shares of Common Stock</div>

This prospectus relates to the resale of up to 3,500,000 shares of Soluna Holdings, Inc.’s (the “Company,” “we,” “our” or “us”) common stock, par value $0.001 per share (“common stock”), by the selling stockholder listed in this prospectus (the “Selling Stockholder”). The shares of common stock registered for resale pursuant to this prospectus consist of (i) 1,000,000 shares (the “Common Shares”) of our common stock issued to the Selling Stockholder on April 29, 2025, and (