Prothena Corp plc (PRTA) is a publicly traded company in the Unknown sector. Across all available filings, 20 corporate insiders have executed 629 transactions totaling $288.2M, demonstrating a bearish sentiment with -$134.8M in net insider flow. The most recent transaction on Jul 28, 2025 involved a transaction of 140,000 shares valued at $0.
No significant insider buying has been recorded for PRTA in the recent period.
No significant insider selling has been recorded for PRTA in the recent period.
Based on recent SEC filings, insider sentiment for PRTA is bearish with an Insider Alignment Score of 27/100 and a net flow of -$134.8M. Insiders are reducing their positions, though this can be driven by factors unrelated to company outlook.
Insider trading at Prothena Corp plc (PRTA) refers to stock transactions made by corporate insiders—executives, directors, and beneficial owners holding more than 10% of the company's shares. These individuals have access to material non-public information and are required by law to report their trades to the SEC within two business days. Currently, 20 insiders are actively trading PRTA stock, having executed 629 transactions in the past 90 days. The most active insider is Capital, Llc Ecor1 (Executive), who has made 13 transactions totaling $114.6M.
Get notified when executives and directors at PRTA file new Form 4 transactions
Date | Insider | Title | Type | Shares | Price | Value | Flags |
|---|---|---|---|---|---|---|---|
| Jul 28, 2025 | G. Kinney Gene | Executive | Award | 140,000 | $N/A | $0 | |
| Jul 28, 2025 | J. Malecek Michael | Executive | Award | 80,000 | $N/A | $0 | |
| Jul 28, 2025 | Nguyen Tran | Executive | Award | 95,000 | $N/A | $0 | |
| Jul 28, 2025 | S. Smith Brandon | Executive | Award | 130,000 | $N/A | $0 | |
| Jul 28, 2025 | J. Swanson Chad | Executive | Award | 85,000 | $N/A | $0 | |
| Jul 28, 2025 | L. Walker Karin | Executive | Award | 25,000 | $N/A | $0 | |
| Jul 28, 2025 | M. Zago Wagner | Executive | Award | 85,000 | $N/A | $0 | |
| Jan 24, 2024 | L. Walker Karin | Executive | Option Exercise | 5,000 | $13.53 | $67.7K | 10b5-1 |
| Jan 24, 2024 | L. Walker Karin | Executive | Sale | 5,000 | $34.00 | $170.0K | 10b5-1 |
| Dec 20, 2023 | L. Walker Karin | Executive | Sale | 3,322 | $37.45 | $124.4K | 10b5-1 |
| Dec 20, 2023 | L. Walker Karin | Executive | Option Exercise | 5,000 | $13.53 | $67.7K | 10b5-1 |
| Dec 20, 2023 | L. Walker Karin | Executive | Sale | 1,678 | $36.68 | $61.5K | 10b5-1 |
| Nov 30, 2023 | L. Walker Karin | Executive | Option Exercise | 5,000 | $13.53 | $67.7K | 10b5-1 |
| Nov 30, 2023 | L. Walker Karin | Executive | Sale | 5,000 | $34.00 | $170.0K | 10b5-1 |
| Oct 25, 2023 | L. Walker Karin | Executive | Option Exercise | 5,000 | $13.53 | $67.7K | 10b5-1 |
| TYPE | COUNT | VALUE | % |
|---|---|---|---|
Sale(S) | 401 | $211.5M | 66.5% |
Purchase(P) | 18 | $76.7M | 24.1% |
Exercise(M) | 194 | $22.4M | 7.0% |
Exercise (Options)(X) | 1 | $7.5M | 2.4% |
Award(A) | 7 | $0 | 0.0% |
Gift(G) | 6 | $0 | 0.0% |
Other(J) | 2 | $0 | 0.0% |
Insider selling pressure at Prothena Corp plc has increased, with 20 insiders executing 629 transactions across all time. Total sales of $211.5M significantly outpace purchases of $76.7M, resulting in a net outflow of $134.8M. However, 86% of these transactions are pre-scheduled 10b5-1 plans, often used for tax planning or diversification rather than signaling negative outlook.