Transaction · 0001045463-26-000014

SCULLY WILLIAM P

SCULLY WILLIAM P, 10%, reported an open-market or private purchase at PROTHENA CORP PUBLIC LTD CO involving 50000.000000 shares for an estimated $439430.00. Reported holdings after the transaction were 800000.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market buySEC transaction code P10%
PRTAPROTHENA CORP PUBLIC LTD CO
Filing timeAug 21
Trade dateAug 20, 2026
Filing · SECView on SEC
InsiderProfile

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$9.44
Pre-filing
1mo ago -7.3%1w ago -3.8%1d ago -1.7%
Returns since
7d -1.2%30d -1.2%90d -1.2%180d -1.2%1y -1.2%

PRTA price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
PRTA since 2026-08-21Filed 14 days ago · 30 days of pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Buy
Code P
Identifier
0001045463-26-000014
Ordinary Shares, par value $0.01 per share
Transaction date
Aug 20, 2026
Filed Aug 21, 2026, 06:32 PM · 1d delay
Shares
50.0k sh
$879 per share
Estimated value
$43.9M
Computed from shares × price
Holdings after
800k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Direct Ownership 10% Owner Buy
+26score
Filing-only score

+26

Compact filing score computed from stored Form 4 facts. Version v1.

Strong filing signal

This filing has a high positive filing-only score. It may deserve closer research, but it is not an investment recommendation.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

No officer title

Officer NoDirector No10% YesOther No
Footnotes & amended
  1. F1

    The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.7497 to $8.9000, inclusive. The reporting person undertakes t…

  2. F2

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

Original filing · 0001045463-26-000014
Related transactions

0 other filings

Same reporting owner
Recent company activity

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