---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-039475"
form_type: "8-K"
ticker: "MBX"
cik: "0001776111"
company_name: "MBX Biosciences, Inc."
filed_at: "2026-02-05T23:59:59+00:00"
generated_at: "2026-05-16T04:30:50.763485+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# MBX Biosciences raises ~$87.1M in ATM offering; 2.25M shares sold at $38.76 VWAP

## Summary
- Closed sale of 2,250,986 shares at a volume-weighted average price of $38.76 for gross proceeds of approximately $87.1 million on February 4, 2026.
- Shares sold under Open Market Sale Agreement with Jefferies dated November 6, 2025, and shelf registration statement effective December 8, 2025.
- Net proceeds to fund clinical-stage programs, discovery R&D, working capital, and potential in-licensing or acquisitions.
- Following this sale, up to $62.9 million in additional common stock remains available for future ATM sales through Jefferies.
- Company retains flexibility to use proceeds for general corporate purposes and complementary business investments.

## SEC filing metadata
- accession: 0001193125-26-039475
- form_type: 8-K
- ticker: MBX
- cik: 0001776111
- company_name: MBX Biosciences, Inc.
- filed_at: 2026-02-05T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1776111/000119312526039475/0001193125-26-039475-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1776111/000119312526039475/mbx-20260204.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-039475
- JSON: https://secwatch.observer/filing/0001193125-26-039475.json
- Plain text: https://secwatch.observer/filing/0001193125-26-039475.txt

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