WS
William P Scully (10% owner) filed 15 Form 4 reports in the trailing twelve months (15 purchases, 0 sales), most often in Prothena Corporation plc (PRTA). Across 13 priced purchase filings, the average 21-session return was +2.1% from execution and -0.6% from disclosure (delay-adjusted; derived). The largest single filing was $1.8M of PRTA (215,000 sh across 2 lots, as filed), executed Oct 7. Data as of Nov 8 2026.
Add to watchlistReturn, ttmiAverage return per filing, trailing twelve months
+2.1%
avg across 13 priced filings
Delay-adjustediThe same average, entered at disclosure dates
-0.6%
same 13 filings, from disclosure
Filings, ttm
15
15 buys · 0 sells
Median delay
2d
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$12.0M
shares × price, as filed
Last traded
Oct 23
Filed Oct 26
Median ADV $4.9M across their filed names
Impact on $10,000 · 12M
$7,900 (-21.0%)
S&P 500 $10,907 (+9.1%) · 30.1 pts behind
William P Scully
S&P 500
Derived: compounded across filings from disclosure dates · past 12 months
Open performance→Volume by month
Buys $14.7M
Sells $0
Shares × price, as filed · by filing month · past 24 months
Sectors filed on
Healthcare
15 filings
Sector per market data · by filing · past 12 months
Most traded names
PRTARecent filings
PRTAPURCHASE
Prothena Corporation plc
View filing →
$439K50,000 sh × $8.79
Exec Aug 20
Filed Aug 21 · 2:32 PM ET PRTAPURCHASE Prothena Corporation plc View filing → $293K
34,000 sh × $8.62
Exec Aug 7
Filed Aug 10 · 3:24 PM ET PRTAPURCHASE Prothena Corporation plc View filing → $158K
20,000 sh × $7.90
Exec Jun 16
Filed Jun 18 · 11:38 AM ET PRTAPURCHASE Prothena Corporation plc View filing → $1.0M
125,000 sh × $8.17
Exec Jun 11
Filed Jun 12 · 5:59 PM ET PRTAPURCHASE Prothena Corporation plc View filing → $465K
50,000 sh × $9.31
Exec Jun 4
Filed Jun 5 · 1:46 PM ET PRTAPURCHASE Prothena Corporation plc View filing → $471K
50,000 sh × $9.43
Exec Jun 2
Filed Jun 3 · 12:41 PM ET PRTAPURCHASE Prothena Corporation plc View filing → $981K
100,000 sh × $9.81
Exec May 22
Filed May 26 · 2:51 PM ET PRTAPURCHASE Prothena Corporation plc View filing → $2.7M
203,436 sh across 3 lots
Exec Dec 18 2024
Filed May 2 2025 · 5:30 PM ET †