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Prothena ($PRTA) Insider Trading & Smart Money Activity

Prothena Corporation plc · Biotechnology · Latest filing Oct 14, 2026

Prothena Corporation plc ($PRTA) has 12 insider trades on file. In the last 12 months on the open market, 2 insiders bought ($8.94M) and no insider sold, net +$8.94M.

Insider buyers (12 mo)
2
Insider sellers (12 mo)
0
Net insider $ (12 mo)
+$8.94M
Congress trades (12 mo)
0
13F moves on file
0
Analyst ratings on file
0

PRTA insider buying and selling by quarter

QuarterInsider buysInsider salesCongress buys / sales13F added / cut
Q1 2026 0 0 0 / 0 0 / 0
Q2 2026 3 · $2.20M 0 0 / 0 0 / 0
Q3 2026 3 · $3.14M 0 0 / 0 0 / 0
Q4 2026 5 · $3.60M 0 0 / 0 0 / 0

Insider buys and sales count open-market trades only (Form 4 codes P and S). Grants, option exercises and tax withholding are left out.

All PRTA insider, congress, 13F and analyst activity

DateSourceWhoActionSharesValue / amount ΔOwn1W1M6MFilingStory
Insider Scully William P10% Owner Buy (Open-market buy) 10K sh $84.57K Read
Insider Scully William P10% Owner Buy (Open-market buy) 100K sh $835.48K Read
Insider Scully William P10% Owner Buy (Open-market buy) 90K sh $770.90K -1.3% —
Insider Scully William P10% Owner Buy (Open-market buy) 125K sh $1.05M -1.3% —
Insider Scully William P10% Owner Buy (Open-market buy) 100K sh $857.24K +5.7% —
Insider Scully William P10% Owner Buy (Open-market buy) 162K sh $1.41M -8.7% —
Insider Scully William P10% Owner Buy (Open-market buy) 103.50K sh $889.87K -5.2% —
Insider Scully William P10% Owner Buy (Open-market buy) 100K sh $843.46K -3.4% Read
Insider William Scully Buy (Open-market buy) 20K sh $158K +15.2%+2.2% Read
Insider William Scully Sell (Gift) 325K sh +12.3%+3.4% —
Insider William Scully Buy (Open-market buy) 125K sh $1.02M +8.1%+6.9% —
Insider William Scully Buy (Open-market buy) 125K sh $1.02M +8.1%+6.9% —

1W / 1M / 6M = how PRTA moved from the trade or filing date.

Insider trading in PRTA: who is buying and selling

InsiderRoleTradesOpen-market netShares heldLast trade
Scully William P 10% Owner 8 +$6.74M Oct 14, 2026
William Scully 4 +$2.20M Jun 16, 2026

Frequently asked questions

Are PRTA insiders buying or selling?

Over the last 12 months 2 insiders made 11 open-market purchases worth $8.94M and 0 insiders made 0 open-market sales worth $0, a net +$8.94M.

What is the latest insider trade in PRTA?

Scully William P, 10% Owner filed a buy (open-market buy) of 10K sh worth $84.57K on Oct 14, 2026.

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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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