Insider BuyPRTA· · June 5, 2026, 5:47 PM UTC
A 10% owner keeps buying Prothena
William Scully adds another 50,000 shares of PRTA.
William Scully, a 10% owner of Prothena, disclosed repeated open-market purchases of PRTA totaling nearly $1M across the window. A large holder accumulating a clinical-stage biotech is the kind of pattern the cluster and magnitude factors reward.
Reporting insider: SCULLY WILLIAM P · 10% owner · discretionary, open-market
The filing, structured
| Security | Date | Type | Shares | Price | Owned after | Holding |
|---|---|---|---|---|---|---|
| Ordinary Shares, par value $0.01 per share | 2026-06-04 | Open-market purchase | +50K | $9.31 | 936K | Direct |
FAQ
- What insider transaction did PROTHENA CORP PUBLIC LTD CO (PRTA) report?
- William Scully, a 10% owner of Prothena, disclosed repeated open-market purchases of PRTA totaling nearly $1M across the window. A large holder accumulating a clinical-stage biotech is the kind of pattern the cluster and magnitude factors reward.
- Who made the purchase at $PRTA?
- SCULLY WILLIAM P, 10% owner, is the reporting insider on this Form 4, a purchase of about $465K.
- Was the $PRTA trade an open-market transaction or a 10b5-1 plan?
- The trade was a discretionary, open-market transaction — not executed under a pre-arranged 10b5-1 plan.
- What is the DEHY Score for this $PRTA filing?
- This filing scored 53 out of 100 on the DEHY Score, a 0–100 triage signal for how much analyst attention a filing warrants — not a price prediction.
Structured from public SEC data within seconds of filing. The DEHY Score is a 0–100 triage signal, not investment advice or a price prediction. See methodology.