---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-25-014928"
form_type: "8-K"
ticker: "ONCO"
cik: "0001782107"
company_name: "Onconetix, Inc."
filed_at: "2025-02-18T23:59:59+00:00"
generated_at: "2026-05-26T17:10:36.075433+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Onconetix issues $117k promissory note, changes auditor, strategy officer resigns

## Summary
- Entered $117,647 promissory note with Keystone Capital; purchase price $100k, due Nov 12, 2025 or earlier from ELOC proceeds.
- Appointed MaloneBailey LLP as new independent auditor effective Feb 13, 2025; no prior disagreements or reportable events.
- Christian Brühlmann resigned as Chief Strategy Officer on Feb 18, 2025; remains as Chief Business Officer of Proteomedix AG.
- Note is subordinate to existing Veru Inc debt obligations.

## SEC filing metadata
- accession: 0001213900-25-014928
- form_type: 8-K
- ticker: ONCO
- cik: 0001782107
- company_name: Onconetix, Inc.
- filed_at: 2025-02-18T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 1.01, 2.03, 4.01, 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1782107/000121390025014928/0001213900-25-014928-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1782107/000121390025014928/ea0231345-8k_onconetix.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-25-014928
- JSON: https://secwatch.observer/filing/0001213900-25-014928.json
- Plain text: https://secwatch.observer/filing/0001213900-25-014928.txt

## Key facts
- Executive change
  Christian Brühlmann resigned as Chief Strategy Officer at Onconetix, Inc..
  - Action: resigned
  - Role: Chief Strategy Officer
  source text: On February 18, 2025, Christian Brühlmann resigned from his position as Chief Strategy Officer of the Company.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1782107/000121390025014928/0001213900-25-014928-index.htm

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