---
schema_version: "secwatch.filing_event.v1"
accession: "0001877939-25-000025"
form_type: "8-K"
ticker: "CTM"
cik: "0001877939"
company_name: "Castellum, Inc."
filed_at: "2025-03-19T23:59:59+00:00"
generated_at: "2026-05-24T12:17:42.922644+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Castellum closes $4.5M public offering of common stock and warrants

## Summary
- Sold 4,500,000 units at $1.00/unit, each consisting of one share and one warrant to buy one share at $1.08.
- Warrants immediately exercisable, expire 60 days from issuance.
- Gross proceeds ~$4.5M; net proceeds for working capital and general corporate purposes.
- Maxim Group LLC acted as sole placement agent on best-efforts basis.
- Securities registered under effective shelf S-3; final prospectus filed.

## SEC filing metadata
- accession: 0001877939-25-000025
- form_type: 8-K
- ticker: CTM
- cik: 0001877939
- company_name: Castellum, Inc.
- filed_at: 2025-03-19T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1877939/000187793925000025/0001877939-25-000025-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1877939/000187793925000025/ctm-20250319.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001877939-25-000025
- JSON: https://secwatch.observer/filing/0001877939-25-000025.json
- Plain text: https://secwatch.observer/filing/0001877939-25-000025.txt

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