William P Scully Insider Trades at Prothena ($PRTA)
William P Scully, 10% Owner at Prothena Corporation plc has 10 Form 4 trades on file since Sep 18, 2026. Open-market activity: 10 purchases ($7.96M) and 0 sales ($0), net +$7.96M. Latest filing: acquired 50K shares of $PRTA on Oct 23, 2026 at $8.07.
- Trades on file
- 10
- Open-market bought
- $7.96M
- Open-market sold
- $0
- Net open-market
- +$7.96M
- Shares held ($PRTA)
- 1.19M
- Latest filing
- Oct 23, 2026
Shares held by William P Scully
Shares owned after the most recent Form 4 for each company.
All insider trades by William P Scully
| Date | Ticker | Type | Shares | Price | Value | Owned after | ΔOwn | 1W | 1M | 6M | Role | Filing | Story |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| $PRTA | Buy (Open-market buy) | 50K | $8.07 | $403.52K | 1.19M | +4.40% | 10% Owner | SEC | Read | ||||
| $PRTA | Buy (Open-market buy) | 100K | $8.19 | $818.52K | 1.14M | +9.64% | 10% Owner | SEC | Read | ||||
| $PRTA | Buy (Open-market buy) | 10K | $8.46 | $84.57K | 1.04M | +0.97% | -4.1% | 10% Owner | SEC | Read | |||
| $PRTA | Buy (Open-market buy) | 100K | $8.35 | $835.48K | 1.03M | +10.79% | +1.7% | 10% Owner | SEC | Read | |||
| $PRTA | Buy (Open-market buy) | 90K | $8.57 | $770.90K | 529K | +20.50% | -1.3% | 10% Owner | SEC | — | |||
| $PRTA | Buy (Open-market buy) | 125K | $8.40 | $1.05M | 439K | +39.81% | -1.3% | 10% Owner | SEC | — | |||
| $PRTA | Buy (Open-market buy) | 100K | $8.57 | $857.24K | 314K | +46.73% | +5.7% | 10% Owner | SEC | — | |||
| $PRTA | Buy (Open-market buy) | 162K | $8.68 | $1.41M | 214K | +311.54% | -8.7% | 10% Owner | SEC | — | |||
| $PRTA | Buy (Open-market buy) | 103.50K | $8.60 | $889.87K | 187K | +123.95% | -5.2% | 10% Owner | SEC | — | |||
| $PRTA | Buy (Open-market buy) | 100K | $8.43 | $843.46K | 927K | +12.09% | -3.4% | -1.2% | 10% Owner | SEC | Read |
"Buy" means shares acquired on the Form 4 (including grants and option exercises); "Sell" means shares disposed. 1W / 1M / 6M = how the stock moved after the trade.
Stocks William P Scully traded
Frequently asked questions
Has William P Scully been buying or selling stock?
William P Scully has 10 open-market purchases and 0 open-market sales on file, net +$7.96M. Grants, option exercises and tax withholding are listed separately because they are not open-market trades.
What was William P Scully's latest insider trade?
acquired 50K shares of $PRTA on Oct 23, 2026 at $8.07.
Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.
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