---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-417402"
form_type: "8-K"
ticker: "RNA"
cik: "0002093101"
company_name: "Atrium Therapeutics, Inc."
filed_at: "2026-10-08T10:52:04+00:00"
generated_at: "2026-10-12T15:39:59.408292+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Atrium Therapeutics raises $50M PIPE at $7.93/share, extending cash runway through 2028

## Summary
- PIPE priced at-the-market: 5,170,384 shares at $7.93 plus pre-funded warrants for 1,134,930 shares at $7.929 each (exercise price $0.001); gross proceeds ~$50M.
- Investors include Sirenia Capital Management, Aberdeen Investments, Montanova, Sessa Capital and Casdin Capital; Leerink Partners is lead placement agent with Cantor, Barclays and Wells Fargo.
- Net proceeds fund development of its two lead precision-cardiology RNA product candidates, other research programs, working capital and general corporate purposes.
- Company estimates proceeds plus existing cash fund operations through 2028; closing expected on or about October 9, 2026.
- Post-offering common shares outstanding total 22,276,027, including shares issued to settle make-whole equity awards from the Avidity Biosciences spin-off.

## SEC filing metadata
- accession: 0001193125-26-417402
- form_type: 8-K
- ticker: RNA
- cik: 0002093101
- company_name: Atrium Therapeutics, Inc.
- filed_at: 2026-10-08T10:52:04+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 3.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2093101/000119312526417402/0001193125-26-417402-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2093101/000119312526417402/d25901d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-417402
- JSON: https://secwatch.observer/filing/0001193125-26-417402.json
- Plain text: https://secwatch.observer/filing/0001193125-26-417402.txt

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