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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 2026-11-07T14:03:26.246Z

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2026-10-262026-10-23SCULLY WILLIAM PP50,000Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-10-23 and its public availability date is 2026-10-26. Subtracting those calendar dates gives 3 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code P: a purchase. A purchase code is only one eligibility check. Confirm reporting-owner role, amendment lineage and coverage before treating it as a strategy input.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0001045463-26-000022 ↗SEC 0001045463-26-000022 ↗SEC 0001045463-26-000021 ↗

Recent Form 4 activity

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2026-10-262026-10-23SCULLY WILLIAM PP50,000Not reported
2026-10-262026-10-22SCULLY WILLIAM PP100,000Not reported
2026-10-152026-10-14SCULLY WILLIAM PP10,000Not reported
2026-10-152026-10-13SCULLY WILLIAM PP100,000Not reported
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

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

Recent institutional filing receipts

Inspect all 50 displayed rows: 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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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.