Public ownership evidence

Prothena Corporation plc Ordinary Shares (PRTA) Ownership Disclosures

Read PRTA insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Prothena Corporation plc Ordinary Shares: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-10-09
Trade date
2026-10-08
Reporting owners
SCULLY WILLIAM P
Code
P
Shares
90,000
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001045463-26-000020
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read PRTA fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read PRTA fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity

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2026-10-092026-10-08SCULLY WILLIAM PP90,000Not reported
2026-10-092026-10-07SCULLY WILLIAM PP125,000Not reported
2026-10-062026-10-02SCULLY WILLIAM PP100,000Not reported
2026-09-302026-09-29SCULLY WILLIAM PP162,000Not reported
2026-09-292026-09-28SCULLY WILLIAM PP103,500Not reported
2026-09-212026-09-18SCULLY WILLIAM PP100,000Not reported
2026-09-042026-09-02SCULLY WILLIAM PP27,000Not reported
2026-08-222026-08-20SCULLY WILLIAM PP50,000Not reported
2026-08-112026-08-07SCULLY WILLIAM PP3,500Not reported
2026-08-112026-08-07SCULLY WILLIAM PP34,000Not reported
2026-07-312026-07-29Kingston Anne EvansS7,662Not reported
2026-07-312026-07-29Isaacs Michael JohnS8,386Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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Cornerstone Financial Management LLC2026-06-302026-08-2955$538None
Cornerstone Financial Management LLC2026-03-312026-08-2955$535None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25613$6,001None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-256,001$613,000None
Assenagon Asset Management S.A.2026-06-302026-08-2262,785$614,665None
Palo Alto Investors LP2026-06-302026-08-201,143,155$11,191,487None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-2011,454$112,135None
Palo Alto Investors LP2026-06-302026-08-191,143,155$11,191,487None
Leo H. Evart, Inc.2026-06-302026-08-1922$215None
Palo Alto Investors LP2026-06-302026-08-181,143,155$11,191,487None
Seven Fleet Capital Management LP2026-06-302026-08-1843,300$423,907None
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO2026-06-302026-08-1842,158$412,727None
Graham Capital Management, L.P.2026-06-302026-08-1518,496$181,076None
SEI INVESTMENTS CO2026-06-302026-08-1530,773$301,268None
SEI INVESTMENTS CO2026-06-302026-08-15104$1,020None
Federation des caisses Desjardins du Quebec2026-06-302026-08-15500$4,895None
SHELTON CAPITAL MANAGEMENT2026-06-302026-08-1539,472$386,431None
Rafferty Asset Management, LLC2026-06-302026-08-1540,397$395,487None
Susquehanna Portfolio Strategies, LLC2026-06-302026-08-1582,710$809,731None
Basecamp Wealth Advisors LLC2026-06-302026-08-15197$1,929None
Quarry LP2026-06-302026-08-1590$881None
ADAR1 Capital Management, LLC2026-06-302026-08-151,554,535$15,218,898None
Rangeley Capital, LLC2026-06-302026-08-15417,270$4,085,073None
DIADEMA PARTNERS LP2026-06-302026-08-15149,482$1,463,429None
MONIMUS CAPITAL MANAGEMENT, LP2026-06-302026-08-15329,052$3,221,419None
XTX Topco Ltd2026-06-302026-08-1585,717$839,169None
Aquatic Capital Management LLC2026-06-302026-08-1525,419$248,852None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15355,896$3,484,222None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15355,896$3,484,222None
ExodusPoint Capital Management, LP2026-06-302026-08-1582,023$803,005None
Qube Research & Technologies Ltd2026-06-302026-08-15791,169$7,745,545None
IFG Advisory, LLC2026-06-302026-08-157$69None
OSAIC HOLDINGS, INC.2026-06-302026-08-15278$2,719None
Schonfeld Strategic Advisors LLC2026-06-302026-08-1550,350$492,925None
Squarepoint Ops LLC2026-06-302026-08-15223,971$2,192,676None
Man Group plc2026-06-302026-08-15678,116$6,638,756None
Trexquant Investment LP2026-06-302026-08-1576,731$751,196None
Quinn Opportunity Partners LLC2026-06-302026-08-1550,000$489,500None
MetLife Investment Management, LLC2026-06-302026-08-1525,890$253,463None
Engineers Gate Manager LP2026-06-302026-08-1541,270$404,033None
Birchview Capital, LP2026-06-302026-08-15449,019$4,395,896None
JANE STREET GROUP, LLC2026-06-302026-08-1547,500$465,025Put
JANE STREET GROUP, LLC2026-06-302026-08-15103,600$1,014,244Call
Legal & General Group Plc2026-06-302026-08-154,512$44,172None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15420,900$4,120,611Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1566,000$646,140Put
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-15149,900$1,467,521Call
JONES FINANCIAL COMPANIES LLLP2026-06-302026-08-1519,430$194,689None
AMERIPRISE FINANCIAL INC2026-06-302026-08-1522$215None
AMERIPRISE FINANCIAL INC2026-06-302026-08-15903$8,840None

90-day public filing window, up to 50 source positions.

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗Assenagon Asset Management S.A. ↗Palo Alto Investors LP ↗MERCER GLOBAL ADVISORS INC /ADV ↗Palo Alto Investors LP ↗Leo H. Evart, Inc. ↗Palo Alto Investors LP ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

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