As of September 09, 2026, Clene's top three insider holders are John Henry Stevens (Director, 800.20K shares), Resonance Llc General (TenPercentOwner, 704.59K shares), Resonance Llc General (TenPercentOwner, 704.59K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | David J Matlin | Director | 922,315 | 0 | 922,315 | 25.9% | 13 Jan, 2026 |
| 2 | John Henry Stevens | Director | 800,204 | 0 | 800,204 | 22.4% | 27 Jun, 2023 |
| 3 | Resonance Llc General | TenPercentOwner | 704,591 | 0 | 704,591 | 19.8% | 21 Aug, 2025 |
| 4 | Reed N Wilcox | Director | 575,145 | 0 | 575,145 | 16.1% | 14 Nov, 2022 |
| 5 | Alison Mosca | Director | 0 | 280,500 | 280,500 | 7.9% | 13 Jan, 2026 |
| 6 | Chidozie Ugwumba | TenPercentOwner | 0 | 198,890 | 198,890 | 5.6% | 05 May, 2026 |
| 7 | Robert Dee Etherington | Chief Executive Officer | 40,149 | 0 | 40,149 | 1.1% | 01 Oct, 2024 |
| 8 | Mark Mortenson | Chief Science Officer | 28,949 | 0 | 28,949 | 0.8% | 01 Oct, 2024 |
| 9 | Robert Glanzman | Chief Medical Officer | 10,564 | 0 | 10,564 | 0.3% | 18 May, 2022 |
| 10 | Jonathon Gay | Director | 0 | 5,281 | 5,281 | 0.1% | 20 Jun, 2023 |
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 |
|---|---|---|---|---|---|---|---|---|
| 13 Aug, 2026 | David J Matlin | Director | Acquired A | 6,230 | $0.00 | $0 | 6,230 | Direct |
| 13 Aug, 2026 | Vallerie Mclaughlin | Director | Acquired A | 3,514 | $0.00 | $0 | 3,514 | Direct |
| 13 Aug, 2026 | Shalom Jacobovitz | Director | Acquired A | 4,752 | $0.00 | $0 | 4,752 | Direct |
| 13 Aug, 2026 | Arjun Jj Desai | Director | Acquired A | 3,674 | $0.00 | $0 | 3,674 | Direct |
| 13 Aug, 2026 | Matthew Kiernan | Director | Acquired A | 3,195 | $0.00 | $0 | 3,195 | Direct |
| 13 Aug, 2026 | Jonathon Gay | Director | Acquired A | 3,794 | $0.00 | $0 | 3,794 | Direct |
| 13 Aug, 2026 | Alison Mosca | Director | Acquired A | 4,872 | $0.00 | $0 | 4,872 | Direct |
| 13 Aug, 2026 | Reed N Wilcox | Director | Acquired A | 3,514 | $0.00 | $0 | 3,514 | Direct |
| 17 Jul, 2026 | Chidozie Ugwumba | TenPercentOwner | Disposed J | 375,000 | — | — | 0 | Indirect |
| 17 Jul, 2026 | Chidozie Ugwumba | TenPercentOwner | Disposed J | 424,358 | — | — | 0 | Indirect |
| 11 Jun, 2026 | Morgan R Brown | Chief Financial Officer | Acquired A | 15,000 | $0.00 | $0 | 15,000 | Direct |
| 11 Jun, 2026 | Robert Dee Etherington | President Ceo | Acquired A | 65,000 | $0.00 | $0 | 65,000 | Direct |
| 11 Jun, 2026 | Mark Mortenson | Chief Science Officer | Acquired A | 45,000 | $0.00 | $0 | 45,000 | Direct |
| 21 May, 2026 | Vallerie Mclaughlin | Director | Acquired A | 1,500 | $0.00 | $0 | 1,500 | Direct |
| 21 May, 2026 | Jonathon Gay | Director | Acquired A | 1,500 | $0.00 | $0 | 1,500 | Direct |
| 21 May, 2026 | Reed N Wilcox | Director | Acquired A | 1,500 | $0.00 | $0 | 1,500 | Direct |
| 21 May, 2026 | Alison Mosca | Director | Acquired A | 1,500 | $0.00 | $0 | 1,500 | Direct |
| 21 May, 2026 | David J Matlin | Director | Acquired A | 1,500 | $0.00 | $0 | 1,500 | Direct |
| 21 May, 2026 | Arjun Jj Desai | Director | Acquired A | 1,500 | $0.00 | $0 | 1,500 | Direct |
| 21 May, 2026 | Shalom Jacobovitz | Director | Acquired A | 1,500 | $0.00 | $0 | 1,500 | Direct |