Transaction · 0001045463-26-000020

SCULLY WILLIAM P

SCULLY WILLIAM P, 10%, reported an open-market or private purchase at PROTHENA CORP PUBLIC LTD CO involving 125000.000000 shares for an estimated $1050150.00. Reported holdings after the transaction were 439000.000000 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 timeOct 09
Trade dateOct 07, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position traded39.81%Shares purchased ÷ (holdings after − shares purchased). Estimated position before: 314,000 shares.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$8.61
Pre-filing
1mo ago +14.1%1w ago -2.7%1d ago -6.9%
Returns since
7d30d90d180d1y

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 2026-10-09Filed today · 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
0001045463-26-000020
Ordinary Shares, par value $0.01 per share
Transaction date
Oct 07, 2026
Filed Oct 09, 2026, 01:43 PM · 2d delay
Shares
125k sh
$8.40 per share
Estimated value
$1.05M
Computed from shares × price
Holdings after
439k sh
Indirect · By Spouse

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Large Buy Large Holdings Increase Repeat Buyer 10% Owner Buy
+46score
Filing-only score

+46

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 $8.2100 to $8.6000, inclusive. The reporting person undertakes t…

  2. F2

    The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.4000 to $8.8063, inclusive.

  3. F3

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

Original filing · 0001045463-26-000020
Related transactions

0 other filings

Same reporting owner
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