Over the trailing 12 months, PRTA insiders bought $9.93 million worth of shares (1.14Mn shares) and sold $135,975 worth (16.05K shares) in open-market trades.
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Capital, Llc Ecor1 | TenPercentOwner | 0 | 5,304,596 | 5,304,596 | 78.4% | 06 May, 2025 |
| 2 | William P Scully | TenPercentOwner | 1,037,000 | 0 | 1,037,000 | 15.3% | 15 Oct, 2026 |
| 3 | Michael J Malecek | Chief Legal Officer | 80,000 | 0 | 80,000 | 1.2% | 30 Jul, 2025 |
| 4 | Gene G. Kinney | President And Ceo | 68,793 | 0 | 68,793 | 1.0% | 30 Jul, 2026 |
| 5 | Anne Evans Kingston | Chief Strategy Officer | 55,782 | 0 | 55,782 | 0.8% | 30 Jul, 2026 |
| 6 | Brandon S. Smith | Chief Operating Officer | 52,000 | 0 | 52,000 | 0.8% | 30 Jul, 2026 |
| 7 | Chad J. Swanson | Chief Development Officer | 40,733 | 0 | 40,733 | 0.6% | 30 Jul, 2026 |
| 8 | Tran Nguyen | Chief Strategy Officer And Cfo | 40,205 | 0 | 40,205 | 0.6% | 30 Jul, 2026 |
| 9 | Michael John Isaacs | General Counsel Company Sec. | 35,745 | 0 | 35,745 | 0.5% | 30 Jul, 2026 |
| 10 | Wagner M. Zago | Chief Scientific Officer | 34,000 | 0 | 34,000 | 0.5% | 30 Jul, 2026 |
| 11 | Karin L Walker | Chief Accounting Officer | 10,000 | 0 | 10,000 | 0.1% | 30 Jul, 2026 |
| 12 | Dennis J. Selkoe | Director | 2,845 | 0 | 2,845 | 0.0% | 03 Jul, 2023 |
| 13 | Richard T Collier | Director | 1,219 | 0 | 1,219 | 0.0% | 05 Jan, 2023 |
| 14 | Lars Ekman | Director, Other | 243 | 0 | 243 | 0.0% | 05 Jan, 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 Oct, 2026 | William P Scully | TenPercentOwner | Acquired P | 100,000 | $8.35 | $835.48K | 1,027,000 | Direct |
| 14 Oct, 2026 | William P Scully | TenPercentOwner | Acquired P | 10,000 | $8.46 | $84.57K | 1,037,000 | Direct |
| 07 Oct, 2026 | William P Scully | TenPercentOwner | Acquired P | 125,000 | $8.40 | $1.05Mn | 439,000 | Indirect |
| 08 Oct, 2026 | William P Scully | TenPercentOwner | Acquired P | 90,000 | $8.57 | $770.90K | 529,000 | Indirect |
| 02 Oct, 2026 | William P Scully | TenPercentOwner | Acquired P | 100,000 | $8.57 | $857.24K | 314,000 | Indirect |
| 29 Sep, 2026 | William P Scully | TenPercentOwner | Acquired P | 162,000 | $8.68 | $1.41Mn | 214,000 | Indirect |
| 28 Sep, 2026 | William P Scully | TenPercentOwner | Acquired P | 103,500 | $8.60 | $889.87K | 187,000 | Indirect |
| 18 Sep, 2026 | William P Scully | TenPercentOwner | Acquired P | 100,000 | $8.43 | $843.46K | 927,000 | Direct |
| 02 Sep, 2026 | William P Scully | TenPercentOwner | Acquired P | 27,000 | $9.47 | $255.74K | 827,000 | Direct |
| 20 Aug, 2026 | William P Scully | TenPercentOwner | Acquired P | 50,000 | $8.79 | $439.43K | 800,000 | Direct |
| 17 Aug, 2026 | William P Scully | TenPercentOwner | Acquired G | 336,000 | $0.00 | $0 | 1,377,553 | Direct |
| 18 Aug, 2026 | William P Scully | TenPercentOwner | Disposed G | 627,553 | $0.00 | $0 | 750,000 | Direct |
| 10 Aug, 2026 | William P Scully | TenPercentOwner | Acquired G | 251,553 | $0.00 | $0 | 1,041,553 | Direct |
| 07 Aug, 2026 | William P Scully | TenPercentOwner | Acquired P | 34,000 | $8.62 | $293.05K | 790,000 | Direct |
| 07 Aug, 2026 | William P Scully | TenPercentOwner | Acquired P | 3,500 | $8.62 | $30.17K | 83,500 | Indirect |
| 28 Jul, 2026 | Anne Evans Kingston | Chief Strategy Officer | Disposed F | 3,498 | $8.56 | $29.94K | 63,444 | Direct |
| 28 Jul, 2026 | Chad J. Swanson | Chief Development Officer | Acquired M | 51,000 | — | — | 85,000 | Direct |
| 28 Jul, 2026 | Tran Nguyen | Chief Strategy Officer And Cfo | Acquired M | 57,000 | — | — | 97,205 | Direct |
| 28 Jul, 2026 | Michael John Isaacs | General Counsel Company Sec. | Disposed F | 4,694 | $8.56 | $40.18K | 44,131 | Direct |
| 28 Jul, 2026 | Karin L Walker | Chief Accounting Officer | Acquired M | 15,000 | — | — | 25,000 | Direct |