Michael J. Malecek serves as Executive at PROTHENA CORP PUBLIC LTD CO, where they oversee executive responsibilities. Since joining the company, Michael J. Malecek has executed 50 insider transactions totaling $9.3M, demonstrating a bearish approach to their equity position. Their most recent transaction on Jul 28, 2025 involved receiving (via award) 80,000 shares valued at $0.
Michael J. Malecek currently holds 80,000 shares of PROTHENA CORP PUBLIC LTD CO (PRTA), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Michael J. Malecek has been a net seller of PRTA stock. They have purchased $0 and sold $9.3M worth of shares.
Michael J. Malecek's most recent insider trade was on Jul 28, 2025, when they sold 80,000 shares at $0.00 per share.
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| $48.31 |
| Planned |
| Sep 27, 2023 | PRTA | $51.4K | Option Exercise | 5,000 | $10.27 | Planned |
| Sep 27, 2023 | PRTA | $217.3K | Sale | 4,596 | $47.29 | Planned |
| Aug 30, 2023 | PRTA | $147.6K | Sale | 2,664 | $55.39 | Planned |
| Aug 30, 2023 | PRTA | $126.7K | Sale | 2,322 | $54.58 | Planned |
| Aug 30, 2023 | PRTA | $51.4K | Option Exercise | 5,000 | $10.27 | Planned |
| Aug 30, 2023 | PRTA | $787 | Sale | 14 | $56.21 | Planned |
| Jul 26, 2023 | PRTA | $119.3K | Sale | 1,903 | $62.69 | Planned |
| Jul 26, 2023 | PRTA | $153.0K | Sale | 2,477 | $61.78 | Planned |
| Jul 26, 2023 | PRTA | $51.4K | Option Exercise | 5,000 | $10.27 | Planned |
| Jul 26, 2023 | PRTA | $39.3K | Sale | 620 | $63.40 | Planned |
| Jun 28, 2023 | PRTA | $85.6K | Sale | 1,240 | $69.07 | Planned |
| Jun 28, 2023 | PRTA | $51.4K | Option Exercise | 5,000 | $10.27 | Planned |
| Jun 28, 2023 | PRTA | $213.2K | Sale | 3,050 | $69.89 | Planned |
| Jun 28, 2023 | PRTA | $50.3K | Sale | 710 | $70.84 | Planned |
| May 31, 2023 | PRTA | $46.9K | Sale | 711 | $65.98 | Planned |
| May 31, 2023 | PRTA | $70.3K | Sale | 1,078 | $65.20 | Planned |
| May 31, 2023 | PRTA | $51.4K | Option Exercise | 5,000 | $10.27 | Planned |
| May 31, 2023 | PRTA | $206.0K | Sale | 3,211 | $64.16 | Planned |
| Apr 26, 2023 | PRTA | $249.9K | Sale | 4,680 | $53.40 | Planned |
| Apr 26, 2023 | PRTA | $17.4K | Sale | 320 | $54.25 | Planned |
| Apr 26, 2023 | PRTA | $51.4K | Option Exercise | 5,000 | $10.27 | Planned |
| Mar 29, 2023 | PRTA | $51.4K | Option Exercise | 5,000 | $10.27 | Planned |
| Mar 29, 2023 | PRTA | $133.4K | Sale | 2,734 | $48.81 | Planned |
| Mar 29, 2023 | PRTA | $111.7K | Sale | 2,266 | $49.28 | Planned |
| Mar 15, 2023 | PRTA | $309.8K | Sale | 6,436 | $48.13 | Discretionary |
| Mar 15, 2023 | PRTA | $416.8K | Sale | 8,564 | $48.67 | Discretionary |
| Mar 15, 2023 | PRTA | $154.1K | Option Exercise | 15,000 | $10.27 | Discretionary |
| Nov 30, 2022 | PRTA | $51.4K | Option Exercise | 5,000 | $10.27 | Discretionary |