P

PRTA

Nasdaq

PROTHENA CORP PUBLIC LTD CO

Latest disclosureOctober 6, 2026

Insider score Why 47?: 47/ 100
Qualifying buys · 30d: $4M

13 purchases · 2 sales

Price by TradingView

Insider transactions 47

Limited filing history

Filters

Last 30 daysInsiders bought $4M · 1 buyer, led by William P. Scully (10% owner) with $4M. No qualifying insider sales.

Showing the first 6 of 13 trades on this page.

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $857.24K
Reported price: $8.5724 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $1.41M
Reported price: $8.677 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $889.87K
Reported price: $8.5978 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $843.46K
Reported price: $8.4346 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $255.74K
Reported price: $9.4718 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $439.43K
Reported price: $8.7886 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $293.05K
Reported price: $8.6192 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $30.17K
Reported price: $8.6192 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $157.99K
Reported price: $7.8995 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $1.02M
Reported price: $8.1698 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $465.3K
Reported price: $9.3059 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $471.3K
Reported price: $9.426 / share

Purchase disclosed

William P. Scully

10% owner

Ordinary Shares, par value $0.01 per share

Reported value: $981.3K
Reported price: $9.813 / share

Reporting insider	Security / transaction	Amount / price	Value	Traded / disclosed	Source
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	100,000$8.57 / share	$857.24K	Oct 2Filed Oct 6 · 4d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	162,000$8.68 / share	$1.41M	Sep 29Filed Sep 30 · 1d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	103,500$8.60 / share	$889.87K	Sep 28Filed Sep 29 · 1d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	100,000$8.43 / share	$843.46K	Sep 18Filed Sep 21 · 3d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	27,000$9.47 / share	$255.74K	Sep 2Filed Sep 3 · 1d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	50,000$8.79 / share	$439.43K	Aug 20Filed Aug 21 · 1d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase2 trades	37,500avg $8.62 / share	$323.22K	Aug 7Filed Aug 10 · 3d later	2 filings 34,000 @ $8.62 · $293.05KSEC filing 3,500 @ $8.62 · $30.17KSEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	20,000$7.90 / share	$157.99K	Jun 16Filed Jun 18 · 2d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	125,000$8.17 / share	$1.02M	Jun 11Filed Jun 12 · 1d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	50,000$9.31 / share	$465.3K	Jun 4Filed Jun 5 · 1d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	50,000$9.43 / share	$471.3K	Jun 2Filed Jun 3 · 1d later	SEC filing
10% owner	Ordinary Shares, par value $0.01 per sharePurchase	100,000$9.81 / share	$981.3K	May 22Filed May 26 · 4d later	SEC filing

Why this buying score?

Qualifying common-equity purchase value

$5,385,325 of common-equity purchase value after transaction-age decay across 180 days.

+25 pts

Distinct buying groups

1 distinct reporting-owner group(s). Joint rows count once; identity is not proof of discretion.

+7 pts

Repeated purchases

A reporting-owner group bought on at least two distinct dates within the cluster window.

+5 pts

Material reported holdings increase

At least one row increased reported same-security holdings by 10% or established a new reported position; indirect interests may overlap.

+10 pts

This score describes qualifying insider purchases at issuer level. Read the methodology

Sources and coverage

Source: SEC EDGAR · Form 4
Issuer CIK: 0001559053
Latest public acceptance: Oct 6, 2026, 05:53 PM UTC
Score calculated: Oct 7, 2026, 12:08 AM UTC
Parser: form4-parser-1.5
Classifier: form4-classifier-1.1
Scoring methodology: insider-experimental-1.1
Availability: Public filing time, not trade date

Open a transaction's SEC filing for the primary evidence. A code P may describe an open-market or private purchase; classification is not proof of intent.

Insider activity can have many explanations. Signal Strength is not a probability of profit or a recommendation to trade.