---
schema_version: "secwatch.filing_event.v1"
accession: "0001493152-25-014613"
form_type: "8-K"
ticker: "SLNH"
cik: "0000064463"
company_name: "Soluna Holdings, Inc"
filed_at: "2025-09-23T23:59:59+00:00"
generated_at: "2026-05-17T05:55:27.383809+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Soluna Holdings files prospectus supplement for up to $87.65M ATM equity offering

## Summary
- Company filed prospectus supplement for ATM offering of common stock with aggregate offering price up to $87,650,000.
- Previously sold 13,680,483 shares for gross proceeds of approximately $12.3 million under same Sales Agreement.
- Offering conducted via H.C. Wainwright & Co. under Sales Agreement dated April 29, 2025.
- Legal opinion on share validity from Brownstein Hyatt Farber Schreck, LLP attached as Exhibit 5.1.

## SEC filing metadata
- accession: 0001493152-25-014613
- form_type: 8-K
- ticker: SLNH
- cik: 0000064463
- company_name: Soluna Holdings, Inc
- filed_at: 2025-09-23T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/64463/000149315225014613/0001493152-25-014613-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/64463/000149315225014613/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001493152-25-014613
- JSON: https://secwatch.observer/filing/0001493152-25-014613.json
- Plain text: https://secwatch.observer/filing/0001493152-25-014613.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.