William P. Scully - 16 Jun 2026 Form 4 Insider Report for PROTHENA CORP PUBLIC LTD CO (PRTA)

Reporting relationship: 10%+ Owner
Issuer ticker: PRTA
Reported as of: 16 Jun 2026
Net transaction value: +$157,990
SEC form: 4
Accepted by SEC: 18 Jun 2026, 11:38:32 UTC
Prior SEC filing: 16 Jun 2026
Source filing: View source filing
Reporting owner signature: Reid E. Buchanan by POA from William P. Scully

Key filing fact

William P. Scully filed Form 4 for PROTHENA CORP PUBLIC LTD CO (PRTA) on 18 Jun 2026.

Key facts

This page summarizes William P. Scully's Form 4 filing for PROTHENA CORP PUBLIC LTD CO (PRTA).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 18 Jun 2026, 11:38.

Change

Previous filing in this sequence was filed on 16 Jun 2026.
Current net transaction value: +$157,990.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001045463 Primary reporting owner

SCULLY WILLIAM P

Relationship: 10%+ Owner
Address: 771 MANATEE COVE, VERO BEACH
Signature: Reid E. Buchanan by POA from William P. Scully
Signature date: 18 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

PRTA transaction

Ordinary Shares, par value $0.01 per share

Purchase

Transaction value: $157,990
Shares: +20,000
Change %: +2.7%
Price: $7.90
Shares after: 756,000
Date: 16 Jun 2026
Ownership: Direct
Footnotes: F1

PRTA holding

Ordinary Shares, par value $0.01 per share

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 80,000
Date: 16 Jun 2026
Ownership: By Manatee Equity Fund LLC
Footnotes: F2

PRTA holding

Ordinary Shares, par value $0.01 per share

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 52,000
Date: 16 Jun 2026
Ownership: By Spouse

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $7.8600 to $7.9312, inclusive. The reporting person undertakes to provide to Prothena Corp Public Ltd Co, any security holder of Prothena Corp Public Ltd Co, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4.

Footnote F2

The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.