Onconetix's top three insider shareholders as of September 09, 2026 are Cornerstone Investors Bwv I, Llc Cincinnati (TenPercentOwner, 1.16Mn shares), Ralph Schiess (Interim Ceo, Cso, 673.37K shares), Christian Bruhlmann (Chief Strategy Officer, 611.37K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Cornerstone Investors Bwv I, Llc Cincinnati | TenPercentOwner | 1,161,201 | 0 | 1,161,201 | 38.7% | 10 Apr, 2023 |
| 2 | Ralph Schiess | Interim Ceo, Cso | 673,365 | 0 | 673,365 | 22.4% | 22 Jan, 2025 |
| 3 | Christian Bruhlmann | Chief Strategy Officer | 611,372 | 0 | 611,372 | 20.4% | 22 Jan, 2025 |
| 4 | Venture Ag Altos | TenPercentOwner | 273,230 | 0 | 273,230 | 9.1% | 16 Jul, 2025 |
| 5 | Erin Henderson | Chief Business Officer | 174,752 | 0 | 174,752 | 5.8% | 11 May, 2023 |
| 6 | Jon Garfield | Chief Financial Officer | 100,000 | 0 | 100,000 | 3.3% | 11 May, 2023 |
| 7 | Ajit Singh | Director | 3,396 | 0 | 3,396 | 0.1% | 30 Sep, 2024 |
| 8 | Timothy R. Ramdeen | Director | 658 | 0 | 658 | 0.0% | 19 Aug, 2025 |
| 9 | Simon Tarsh | Director | 658 | 0 | 658 | 0.0% | 19 Aug, 2025 |
| 10 | Thomas Meier | Director | 657 | 0 | 657 | 0.0% | 19 Aug, 2025 |
| 11 | Andrew John Oakley | Director | 638 | 0 | 638 | 0.0% | 19 Aug, 2025 |
| 12 | Financial Lp Hrt | TenPercentOwner | 1 | 0 | 1 | 0.0% | 16 Apr, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 14 Apr, 2026 | Financial Lp Hrt | TenPercentOwner | Acquired P | 74,350 | $130,952.38 | $9.74Bn | 1 | Direct |
| 15 Apr, 2026 | Financial Lp Hrt | TenPercentOwner | Acquired P | 92,554 | $129,251.70 | $11.96Bn | 1 | Direct |
| 15 Aug, 2025 | Thomas Meier | Director | Acquired J | 39 | $0.00 | $0 | 39 | Direct |
| 15 Aug, 2025 | Timothy R. Ramdeen | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Timothy R. Ramdeen | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Simon Tarsh | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Simon Tarsh | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Timothy R. Ramdeen | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Timothy R. Ramdeen | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Simon Tarsh | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Simon Tarsh | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Timothy R. Ramdeen | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Simon Tarsh | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Simon Tarsh | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Andrew John Oakley | Director | Acquired J | 20 | $0.00 | $0 | 20 | Direct |
| 15 Aug, 2025 | Timothy R. Ramdeen | Director | Acquired J | 39 | $0.00 | $0 | 40 | Direct |
| 15 Aug, 2025 | Timothy R. Ramdeen | Director | Acquired A | 618 | $0.00 | $0 | 658 | Direct |
| 15 Aug, 2025 | Simon Tarsh | Director | Acquired A | 618 | $0.00 | $0 | 658 | Direct |
| 15 Aug, 2025 | Timothy R. Ramdeen | Director | Acquired A | 618 | $0.00 | $0 | 658 | Direct |
| 15 Aug, 2025 | Simon Tarsh | Director | Acquired A | 618 | $0.00 | $0 | 658 | Direct |