Onconetix, Inc. — Director's Dealing 2025

Jul 16, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Onconetix, Inc. (ONCO)
CIK: 0001782107
Period of Report: 2025-07-14

Reporting Person: Altos Venture AG (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-07-14	Common Stock	J	241514	—	Acquired	273230	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-07-14	Make-whole right (right to acquire)	$	J	241514	Disposed	2025-07-14	Common Stock (241514)	Direct

Footnotes

F1: 1. Pursuant to a Subscription Agreement with the Issuer dated December 15, 2023, the Reporting Person purchased Units of Common Stock and warrants (immediately exercised) on September 24, 2024. Under a "make-whole" provision in the Subscription Agreement, the Issuer agreed to adjust the price for the Units by issuing additional shares of Common Stock to the Reporting Person based on the Issuer VWAP (as defined in the Subscription Agreement) during a specified period following the purchase. At the end of the period, the number of additional shares to be issued was determined to be 241,514, and those shares were issued to the Reporting Person on July 14, 2025 pursuant to the "make-whole" provision.

F2: On September 24, 2024, the Issuer effected a 1-for-40 reverse split of its Common Stock, and on June 13, 2025, the Issuer effected a 1-for-85 reverse split of its Common Stock.