Prothena Insider Trades
NASDAQ: PRTAHealth CareBiotechnology: Pharmaceutical PreparationsUSD
At close: Oct 9, 4:00 PM ET · Delayed 15 min
Last 12 months
- Purchases
- 2 · $1.82M
- Sales
- 0 · $0
- Shares bought / sold
- 215.00K / 0
- Net activity
- Net buying $1.8 million
Prothena insider activity
Over the last 12 months, Prothena insiders reported 2 transactions on SEC Form 4: 2 open-market purchases and 0 sales. Insiders bought $1.8 million and sold $0 worth of stock, for net insider buying of $1.8 million. The most recent filing shows SCULLY WILLIAM P (10% Owner) buying 90,000 shares at $8.57 on Oct 8, 2026.
Insider sales are common for compensation, tax and diversification reasons, while open-market purchases are rarer; tracking both helps put PRTA's ownership changes in context.
Summary generated from market data by MetaCap's automated system. Methodology
PRTA insider transactions
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Oct 8, 2026 | SCULLY WILLIAM P10% Owner | Buy | 90,000 | $770.90K | Form 4 |
| Oct 7, 2026 | SCULLY WILLIAM P10% Owner | Buy | 125,000 | $1.05M | Form 4 |
Transaction codes follow SEC Form 4: P = open-market purchase, S = open-market sale, A = grant or award, M = option exercise, F = shares withheld for taxes. About Form 4