---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-26-058997"
form_type: "8-K"
ticker: "ONCO"
cik: "0001782107"
company_name: "Onconetix, Inc."
filed_at: "2026-05-19T20:05:26+00:00"
generated_at: "2026-05-19T20:06:47.895485+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Onconetix announces 1-for-10 reverse stock split effective May 21, 2026 to meet Nasdaq bid price rule

## Summary
- Board fixed 1-for-10 reverse split ratio; effective 12:01 a.m. ET on May 21, 2026.
- Reverse split reduces outstanding shares from ~11.4M to ~1.14M; no change in authorized shares or par value.
- Split intended to regain compliance with Nasdaq $1.00 minimum bid price rule for continued listing.
- No fractional shares issued; holders of fractional shares will receive cash compensation based on closing price on May 20, 2026.
- Common stock continues trading on Nasdaq Capital Market under symbol ONCO with new CUSIP 68237Q 401.

## SEC filing metadata
- accession: 0001213900-26-058997
- form_type: 8-K
- ticker: ONCO
- cik: 0001782107
- company_name: Onconetix, Inc.
- filed_at: 2026-05-19T20:05:26+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1782107/000121390026058997/0001213900-26-058997-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1782107/000121390026058997/ea0291543-8k_onconetix.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-26-058997
- JSON: https://secwatch.observer/filing/0001213900-26-058997.json
- Plain text: https://secwatch.observer/filing/0001213900-26-058997.txt

## Key facts
- Governance Changes
  Onconetix, Inc.: Amended charter to effect a 1-for-10 reverse stock split of common stock, effective May 21, 2026 (effective 2026-05-21).
  - Change: charter amendment
  - Effective: 2026-05-21
  source text: On May 20, 2026, the Company expects to file an amendment to its Charter with the Secretary of State of the State of Delaware (the “Amendment”) to effect the Reverse Stock Split.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1782107/000121390026058997/0001213900-26-058997-index.htm

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