Insider Transactions Reported by 25 Insiders of Onconetix, Inc.

Symbol: ONCO on Nasdaq
Location: Cincinnati, OH

Quick Takeaways

ONCO - Onconetix, Inc. has 25 insiders with reported activity on this page.
Net insider value flow over the last year: +$8,406.
Recent transaction rows are available for direct filing-level review.

What Changed

Buy value: $152,875; sell value: $144,469.
Net share flow: +3,501.

Why This Matters

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Source Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to buying over the last 12 months. Net value: +$8,406.

Buys

$152,875

Shares: 201,540

Insiders: 1

Sells

$144,469

Shares: 198,039

Insiders: 1

Net

+$8,406

Shares: +3,501

Insiders: 0

Window (months)	Buy shares	Sell shares	Buy $	Sell $	Net $
0-3	201,540	198,039	$152,875	$144,469	+$8,406
3-6	0	0	$0	$0	$0
6-9	0	0	$0	$0	$0
9-12	0	0	$0	$0	$0

Onconetix, Inc. executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Joseph Hernandez	CEO, Director, 10%+ Owner	$11,490,960			Mixed	09 May 2023
Cincinnati Cornerstone Investors BWV I, LLC	10%+ Owner	$4,764,872			Mixed	10 Apr 2023
Ralph Schiess	Interim CEO, CSO	$1,106,888			Mixed	20 Dec 2024
Christian Bruhlmann	Chief Strategy Officer	$968,521			Mixed	20 Dec 2024
Erin Henderson	Chief Business Officer	$717,077			Mixed	09 May 2023
Jon Garfield	Chief Financial Officer	$410,340			Mixed	09 May 2023
Vuk Jeremic	Director	$26,098			Mixed	31 May 2023
James Sapirstein Power	Director	$26,098			Mixed	26 Sep 2024
HRT FINANCIAL LP	10%+ Owner	$23,217	+$8,406	+57%	Filing P/S	14 Apr 2026
Altos Venture AG	10%+ Owner	$21,858			Mixed	14 Jul 2025
Simon Tarsh	Director	$2,112			Mixed	15 Aug 2025
Timothy R. Ramdeen	Director	$2,112			Mixed	15 Aug 2025
Thomas Meier	Director	$2,108			Mixed	15 Aug 2025
Andrew John Oakley	Director	$2,047			Mixed	15 Aug 2025
Bruce Harmon	Chief Financial Officer				Mixed	04 Oct 2023
Neil J. Campbell	Chief Executive Officer, Director				Mixed	04 Oct 2023
Kimberly M. Murphy	Director				Mixed	04 May 2022
Allan Shaw	Director				Mixed	19 Aug 2022
John McCune Rice Jr.	Director				Mixed	17 Feb 2022
Michael Venerable	Director				Mixed	04 May 2022
Ajit Singh	Director				Mixed	26 Sep 2024
Sarah Romano	Director				Mixed	05 Dec 2025
Sammy Dorf	Director				Mixed	19 Mar 2026
David A. White	Chief Executive Officer				Mixed	18 Mar 2026
Karina M. Fedasz	Interim CFO				Mixed	10 Jun 2024

Top shareholders of Onconetix, Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Joseph Hernandez	3/4/5	CEO, Director, 10%+ Owner	— class O/S missing	2,800,351	$11,490,960	—	09 May 2023	3/4/5
Cincinnati Cornerstone Investors BWV I, LLC	3/4/5	10%+ Owner	— class O/S missing	1,161,201	$4,764,872	—	10 Apr 2023	3/4/5
Altos Venture AG	13D/G 3/4/5	10%+ Owner	36%	273,230	$1,307,597	$0	14 Jul 2025	13D/G 3/4/5
Ralph Schiess	3/4/5 13D/G	Interim CEO, CSO	4.6% from 13D/G	673,365	$1,106,888	—	20 Dec 2024	3/4/5 13D/G
Christian Bruhlmann	3/4/5 13D/G	Chief Strategy Officer	4.2% from 13D/G	611,372	$968,521	—	20 Dec 2024	3/4/5 13D/G
Erin Henderson	3/4/5	Chief Business Officer	— class O/S missing	174,752	$717,077	—	09 May 2023	3/4/5
Jon Garfield	3/4/5	Chief Financial Officer	— class O/S missing	100,000	$410,340	—	09 May 2023	3/4/5
DRW Securities, LLC	13F	Company	5.1%	39,046	$60,911	—	31 Dec 2025	13F
Vuk Jeremic	3/4/5	Director	— class O/S missing	6,360	$26,098	—	31 May 2023	3/4/5
James Sapirstein Power	3/4/5	Director	— class O/S missing	3,477	$26,098	—	26 Sep 2024	3/4/5
HRT FINANCIAL LP	3/4/5	10%+ Owner	— class O/S missing	33,649	$23,217	+$8,406	14 Apr 2026	3/4/5
XTX Topco Ltd	13F	Company	1.4%	10,827	$16,890	—	31 Dec 2025	13F
Zurcher Kantonalbank (Zurich Cantonalbank)	13D/G	—	2.5%	207,691	$16,615	$0	24 Dec 2024	13D/G
UBS Group AG	13F	Company	1.2%	9,203	$14,357	—	31 Dec 2025	13F
AMERICAN FINANCIAL GROUP INC	13D/G	—	— class O/S missing	36,023	$2,882	$0	31 Dec 2024	13D/G
Tower Research Capital LLC (TRC)	13F	Company	0.24%	1,819	$2,838	—	31 Dec 2025	13F
Simon Tarsh	3/4/5	Director	0.09%	658	$2,112	—	15 Aug 2025	3/4/5
Timothy R. Ramdeen	3/4/5	Director	0.09%	658	$2,112	—	15 Aug 2025	3/4/5
Thomas Meier	3/4/5	Director	0.09%	657	$2,108	—	15 Aug 2025	3/4/5
Andrew John Oakley	3/4/5	Director	0.08%	638	$2,047	—	15 Aug 2025	3/4/5
SBI Securities Co., Ltd.	13F	Company	0.02%	154	$240	—	31 Dec 2025	13F
BANK OF AMERICA CORP /DE/	13F	Company	0%	11	$17	—	31 Dec 2025	13F
DANSKE BANK A/S	13F	Company	0%	1	$2	—	31 Dec 2025	13F
Kimberly M. Murphy	3/4/5	Director	— class O/S missing	50,575	—	—	04 May 2022	3/4/5
Allan Shaw	3/4/5	Director	— class O/S missing	16,284	—	—	19 Aug 2022	3/4/5
Michael Venerable	3/4/5	Director	— class O/S missing	4,655	—	—	04 May 2022	3/4/5
Ajit Singh	3/4/5	Director	— class O/S missing	3,396	—	—	26 Sep 2024	3/4/5

Recent Insider Transactions by Companies or Individuals for Onconetix, Inc.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
Hrt Financial Lp	ONCO	Class A Shares	Sale	-59.6%	$34,300	$0.6900	-49,710	33,649	21 Apr 2026	Direct
Hrt Financial Lp	ONCO	Class A Shares	Sale	-53.1%	$70,846	$0.7500	-94,462	83,359	20 Apr 2026	Direct
Hrt Financial Lp	ONCO	Class A Shares	Purchase	24.2%	$25,284	$0.7300	34,636	177,821	17 Apr 2026	Direct
Hrt Financial Lp	ONCO	Class A Shares	Sale	-27.3%	$39,323	$0.7300	-53,867	143,185	16 Apr 2026	Direct
Hrt Financial Lp	ONCO	Class A Shares	Purchase	88.6%	$70,341	$0.7600	92,554	197,052	15 Apr 2026	Direct
Hrt Financial Lp	ONCO	Class A Shares	Purchase	246.6%	$57,250	$0.7700	74,350	104,498	14 Apr 2026	Direct
Andrew John Oakley	ONCO	Common Stock	Award	3090%			618	638	15 Aug 2025	Direct
Andrew John Oakley	ONCO	Common Stock	Other				20	20	15 Aug 2025	Direct
Simon Tarsh	ONCO	Common Stock	Award	1545%			618	658	15 Aug 2025	Direct
Simon Tarsh	ONCO	Common Stock	Other	3900%			39	40	15 Aug 2025	Direct
Thomas Meier	ONCO	Common Stock	Award	1584.6%			618	657	15 Aug 2025	Direct
Thomas Meier	ONCO	Common Stock	Other				39	39	15 Aug 2025	Direct
Timothy R. Ramdeen	ONCO	Common Stock	Award	1545%			618	658	15 Aug 2025	Direct
Timothy R. Ramdeen	ONCO	Common Stock	Other	3900%			39	40	15 Aug 2025	Direct
Altos Venture AG	ONCO	Common Stock	Other	761.5%			241,514	273,230	14 Jul 2025	Direct
Altos Venture AG	ONCO	Make-whole right (right to acquire)	Other	-100%			-241,514	0	14 Jul 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.