Paydirt
PRTA
Ticker

Prothena Corporation plc

PRTA · Healthcare · Prothena Corporation plc, a late-stage clinical biotechnology company, focuses on discovery and development of novel therapies to treat dis…

Prothena Corporation plc (PRTA), in the Healthcare sector, has 9 disclosed filings on Paydirt over the trailing twelve months from 1 corporate insider: 9 purchases and 0 sales. Filers took a median of 1 day from execution to disclosure, and the most recent trade was executed Sep 18 and filed Sep 21. The most active filer was William P Scully with 10 filings.

Add to watchlist
Filings, ttm
9
9 buys · 0 sells
Traders, ttm
1
1 insider
Volume, ttmiDollar value disclosed in the window
$4.9M
estimated for Congress, as filed for insiders
Median delay
1d
execution to disclosure
Last traded
Sep 18
Filed today
ADViAverage daily dollar volume
$4.9M
market data
Share price · 12M
$8.51 (+2.7%)
$11.51$9.71$7.91Sep 22 2025Mar 23Sep 21

Adjusted for splits and dividends.

Volume by month
$50.8M$25.4M$0Oct 2024Apr 2025Oct 2025Apr 2026May 2025 · buys $2.7MMay 2025 · sells $50.8MMay 2026 · buys $981KJun 2026 · buys $2.1MAug 2026 · buys $732KSep 2026 · buys $1.1M
Buys $7.6M Sells $50.8M

Estimated for Congress, as filed for insiders · by filing month · past 24 months

Who filed
WS William P Scully 10% owner 10 filings EL EcoR1 Capital, LLC Director 1 filing
Recent filings
William P ScullyPURCHASE 10% owner $843K
100,000 sh × $8.43
Exec Sep 18
Filed Sep 21 · 4:23 PM ET William P ScullyPURCHASE 10% owner $256K
27,000 sh × $9.47
Exec Sep 2
Filed Sep 3 · 6:23 PM ET William P ScullyPURCHASE 10% owner $439K
50,000 sh × $8.79
Exec Aug 20
Filed Aug 21 · 2:32 PM ET William P ScullyPURCHASE 10% owner $293K
34,000 sh × $8.62
Exec Aug 7
Filed Aug 10 · 3:24 PM ET William P ScullyPURCHASE 10% owner $158K
20,000 sh × $7.90
Exec Jun 16
Filed Jun 18 · 11:38 AM ET William P ScullyPURCHASE 10% owner $1.0M
125,000 sh × $8.17
Exec Jun 11
Filed Jun 12 · 5:59 PM ET William P ScullyPURCHASE 10% owner $465K
50,000 sh × $9.31
Exec Jun 4
Filed Jun 5 · 1:46 PM ET William P ScullyPURCHASE 10% owner $471K
50,000 sh × $9.43
Exec Jun 2
Filed Jun 3 · 12:41 PM ET William P ScullyPURCHASE 10% owner $981K
100,000 sh × $9.81
Exec May 22
Filed May 26 · 2:51 PM ET EcoR1 Capital, LLCSALE 10% owner $50.8M
6,279,684 sh across 3 lots
Exec May 2 2025
Filed May 6 2025 · 5:30 PM ET William P ScullyPURCHASE 10% owner $2.7M
203,436 sh across 3 lots
Exec Dec 18 2024
Filed May 2 2025 · 5:30 PM ET †