Based on data from the past 90 days ending December 12, 2025, Prothena Corp Public's three largest insider shareholders are TenPercentOwner Capital, Llc Ecor1 (5.30Mn shares), President And CEO Gene G. Kinney (152.79K shares), Chief Operating Officer Brandon S. Smith (130.00K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Capital, Llc Ecor1 | 5,304,596 | 06 May, 2025 | |
| Gene G. Kinney | President And CEO | 152,793 | 30 Jul, 2025 |
| Brandon S. Smith | Chief Operating Officer | 130,000 | 30 Jul, 2025 |
| Tran Nguyen | Chief Strategy Officer And Cfo | 97,205 | 30 Jul, 2025 |
| Chad J. Swanson | Chief Development Officer | 85,000 | 30 Jul, 2025 |
| Wagner M. Zago | Chief Scientific Officer | 85,000 | 30 Jul, 2025 |
| Michael J Malecek | Chief Legal Officer | 80,000 | 30 Jul, 2025 |
| Karin L Walker | Chief Accounting Officer | 25,000 | 30 Jul, 2025 |
| Dennis J. Selkoe | 2,845 | 03 Jul, 2023 | |
| Richard T Collier | 1,219 | 05 Jan, 2023 | |
| Lars Ekman | 243 | 05 Jan, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 28 Jul, 2025 | Tran Nguyen | Ordinary Shares, par value $0.01 per share | A | 95,000 | $0.00 | 97,205 | D | A |
| 28 Jul, 2025 | Karin L Walker | Ordinary Shares, par value $0.01 per share | A | 25,000 | $0.00 | 25,000 | D | A |
| 28 Jul, 2025 | Wagner M. Zago | Ordinary Shares, par value $0.01 per share | A | 85,000 | $0.00 | 85,000 | D | A |
| 28 Jul, 2025 | Gene G. Kinney | Ordinary Shares, par value $0.01 per share | A | 140,000 | $0.00 | 152,793 | D | A |
| 28 Jul, 2025 | Chad J. Swanson | Ordinary Shares, par value $0.01 per share | A | 85,000 | $0.00 | 85,000 | D | A |
| 28 Jul, 2025 | Michael J Malecek | Ordinary Shares, par value $0.01 per share | A | 80,000 | $0.00 | 80,000 | D | A |
| 28 Jul, 2025 | Brandon S. Smith | Ordinary Shares, par value $0.01 per share | A | 130,000 | $0.00 | 130,000 | D | A |
| 02 May, 2025 | Capital, Llc Ecor1 | - | - | 8,266,342 | I | |||
| 02 May, 2025 | Capital, Llc Ecor1 | Ordinary Shares | D | 3,317,938 | $8.36 | 8,266,342 | I | S |
| 05 May, 2025 | Capital, Llc Ecor1 | - | - | 7,288,649 | I | |||
| 05 May, 2025 | Capital, Llc Ecor1 | Ordinary Shares | D | 977,693 | $8.11 | 7,288,649 | I | S |
| 06 May, 2025 | Capital, Llc Ecor1 | - | - | 5,304,596 | I | |||
| 06 May, 2025 | Capital, Llc Ecor1 | Ordinary Shares | D | 1,984,053 | $7.64 | 5,304,596 | I | S |
| 24 Jan, 2024 | Karin L Walker | - | - | 5,000 | D | |||
| 24 Jan, 2024 | Karin L Walker | Ordinary Shares, par value $0.01 per share | A | 5,000 | $13.53 | 5,000 | D | M |
| 24 Jan, 2024 | Karin L Walker | Ordinary Shares, par value $0.01 per share | D | 5,000 | $34.00 | 0 | D | S |
| 24 Jan, 2024 | Karin L Walker | - | - | 0 | D | |||
| 20 Dec, 2023 | Karin L Walker | Ordinary Shares, par value $0.01 per share | A | 5,000 | $13.53 | 5,000 | D | M |
| 20 Dec, 2023 | Karin L Walker | Ordinary Shares, par value $0.01 per share | D | 1,678 | $36.68 | 3,322 | D | S |
| 20 Dec, 2023 | Karin L Walker | Ordinary Shares, par value $0.01 per share | D | 3,322 | $37.45 | 0 | D | S |