---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-25-028646"
form_type: "8-K"
ticker: "ONCO"
cik: "0001782107"
company_name: "Onconetix, Inc."
filed_at: "2025-04-03T23:59:59+00:00"
generated_at: "2026-05-23T22:43:30.390481+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Executive Chairman Sapirstein resigns; Interim CFO Fedasz appointed Interim CEO

## Summary
- James Sapirstein resigned as Executive Chairman and Board member, effective March 28, 2025.
- Karina Fedasz, 52, previously Interim CFO, appointed Interim CEO effective April 2, 2025.
- Fedasz has background in finance, M&A, and capital raising; formerly CFO at IDW Media Holdings and Head of Business Development at Evofem Biosciences.

## SEC filing metadata
- accession: 0001213900-25-028646
- form_type: 8-K
- ticker: ONCO
- cik: 0001782107
- company_name: Onconetix, Inc.
- filed_at: 2025-04-03T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1782107/000121390025028646/0001213900-25-028646-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1782107/000121390025028646/ea0237140-8k_oncon.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-25-028646
- JSON: https://secwatch.observer/filing/0001213900-25-028646.json
- Plain text: https://secwatch.observer/filing/0001213900-25-028646.txt

## Key facts
- Executive change
  Karina Fedasz was appointed as Interim Chief Executive Officer at Onconetix, Inc..
  - Action: appointed
  - Role: Interim Chief Executive Officer
  source text: On April 2, 2025, the Company appointed Karina Fedasz, 52, the Company’s Interim Chief Financial Officer, as Interim Chief Executive Officer of the Company, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1782107/000121390025028646/0001213900-25-028646-index.htm
- Executive change
  James Sapirstein resigned as Executive Chairman at Onconetix, Inc..
  - Action: resigned
  - Role: Executive Chairman
  source text: Effective as of March 28, 2025, James Sapirstein resigned as Executive Chairman and a member of the Board of Directors (the “Board”) of Onconetix, Inc. (the “Company”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1782107/000121390025028646/0001213900-25-028646-index.htm

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