Form 4: Prothena Corp Public Ltd Executive Sells Shares
Insider Transaction (Form 4)
Michael John Isaacs, General Counsel & Company Sec. of Prothena Corp Public Ltd Co, sold 8,386 shares of common stock on July 28, 2026 for $8.47 per share.
Summary
- Tax/exercise-price withholding: disposed of 4,694 Ordinary Shares, par value $0.01 per share at $8.56 ($40,181) on July 28, 2026; holds 44,131 after (Direct).
- Open-market sale: disposed of 8,386 Ordinary Shares, par value $0.01 per share at $8.47 ($71,055) on July 29, 2026; holds 35,745 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $71,055 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Michael John Isaacs — Officer (General Counsel & Company Sec.)
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-07-28 | Tax/exercise-price withholding | Ordinary Shares, par value $0.01 per share | 4,694 | $9 | $40.2K | 44,131 |
| 2026-07-29 | Open-market sale | Ordinary Shares, par value $0.01 per share | 8,386 | $8 | $71.1K | 35,745 |
Key Dates
| Date | Description |
|---|---|
| 2026-07-28 | Tax/exercise-price withholding (4,694 shares) |
| 2026-07-29 | Open-market sale (8,386 shares) |
Keywords
insider transaction, Form 4, PRTA, PROTHENA CORP PUBLIC LTD CO, bearish, Michael John Isaacs
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