Comparable stake leader
Altos Venture AG
SEC ownership of Onconetix, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001782107.
Disclosed value leader
Joseph Hernandez
Comparable rows
9/26
Latest evidence
20 Jul 2026
- Public ticker
- ONCO on Nasdaq
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Altos Venture AG
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
9 of 26
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Altos Venture AG
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
20 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001782107
- Issuer location
- Cincinnati, OH
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Onconetix, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Altos Venture AG
Disclosed value leader
Joseph Hernandez
Comparable rows
9/26
Latest evidence
20 Jul 2026
13D/G
3/4/5
13F
Lead comparable stake: 36%
17 rows are not safely comparable across share classes.
13D/G row: Altos Venture AG
Showing 1-8 of 26 holder rows.
Quick read
Altos Venture AG leads the comparable SEC ownership view at 36%.
9 of 26 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Altos Venture AG's linked filing trail.
Comparable ownership
Top 5
Altos Venture AG
36%
KEYSTONE CAPITAL PARTNERS, LLC
6.1%
Ralph Schiess
4.6%
Christian Bruhlmann
4.2%
Zurcher Kantonalbank (Zurich Cant...
2.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 26 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Altos Venture AG |
13D/G
3/4/5
10%+ Owner
|
36%
|
$1,307,597
273,230 shares
|
$0 | 14 Jul 2025 |
| KEYSTONE CAPITAL PARTNERS, LLC |
13D/G
|
6.1%
|
$253,024
223,717 shares
|
$0 | 20 Jul 2026 |
| Ralph Schiess |
3/4/5
13D/G
Interim CEO, CSO
|
4.6%
from 13D/G
|
$1,106,888
673,365 shares
|
— | 20 Dec 2024 |
| Christian Bruhlmann |
3/4/5
13D/G
Chief Strategy Officer
|
4.2%
from 13D/G
|
$968,521
611,372 shares
|
— | 20 Dec 2024 |
| Zurcher Kantonalbank (Zurich Cantonalbank) |
13D/G
|
2.5%
|
$16,615
207,691 shares
|
$0 | 24 Dec 2024 |
| Simon Tarsh |
3/4/5
Director
|
0.09%
|
$2,112
658 shares
|
— | 15 Aug 2025 |
| Timothy R. Ramdeen |
3/4/5
Director
|
0.09%
|
$2,112
658 shares
|
— | 15 Aug 2025 |
| Thomas Meier |
3/4/5
Director
|
0.09%
|
$2,108
657 shares
|
— | 15 Aug 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$8,406.
Buys
$152,875
Insiders: 1
Sells
$144,469
Insiders: 1
Net
+$8,406
Shares: +3,501
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 201,540
Shares: 198,039
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 201,540 | 198,039 | $152,875 | $144,469 | +$8,406 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 25 reporting-owner rows connected to Onconetix, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
25
Largest Forms 3/4/5 holder
Joseph Hernandez
Net 12M change
+$8,406
Latest report
14 Apr 2026
| 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 | 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 |
Recent insider transactions for Onconetix, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported 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 |
* marks a reported price that did not pass the local price check.