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PRTA insider trading — Prothena Corp Public Ltd Co

Over the last 90 days, insiders at Prothena Corp Public Ltd Co (PRTA) made 12 open-market purchases worth $7.76M and 0 open-market sales worth $0, making them net buyers by $7.76M. The largest purchase was by Scully William P (10% Owner), who bought 162,000 shares for $1.41M on Sep 29, 2026.

Updated Oct 16, 2026.

Insider buying · 90d
$7.76M
Insider selling · 90d
$0
Net · 90d
+$7.76M
Last 30 days
8B / 0S

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Recent PRTA insider transactions

Every Form 4 filed by Prothena Corp Public Ltd Co officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.

Trade dateInsiderRoleTypeOwnershipSharesPriceValueFiling
Oct 14, 2026Scully William P10% OwnerP · PurchaseDirect10,000$8.46$85KForm 4
Oct 13, 2026Scully William P10% OwnerP · PurchaseDirect100,000$8.35$835KForm 4
Oct 8, 2026Scully William P10% OwnerP · PurchaseIndirect90,000$8.57$771KForm 4
Oct 7, 2026Scully William P10% OwnerP · PurchaseIndirect125,000$8.40$1.05MForm 4
Oct 2, 2026Scully William P10% OwnerP · PurchaseIndirect100,000$8.57$857KForm 4
Sep 29, 2026Scully William P10% OwnerP · PurchaseIndirect162,000$8.68$1.41MForm 4
Sep 28, 2026Scully William P10% OwnerP · PurchaseIndirect103,500$8.60$890KForm 4
Sep 18, 2026Scully William P10% OwnerP · PurchaseDirect100,000$8.43$843KForm 4
Sep 2, 2026Scully William P10% OwnerP · PurchaseDirect27,000$9.47$256KForm 4
Aug 20, 2026Scully William P10% OwnerP · PurchaseDirect50,000$8.79$439KForm 4
Aug 18, 2026Scully William P10% OwnerG · GiftDirect627,553——Form 4
Aug 17, 2026Scully William P10% OwnerG · GiftDirect336,000——Form 4
Aug 10, 2026Scully William P10% OwnerG · GiftDirect251,553——Form 4
Aug 7, 2026Scully William P10% OwnerP · PurchaseDirect34,000$8.62$293KForm 4
Aug 7, 2026Scully William P10% OwnerP · PurchaseIndirect3,500$8.62$30KForm 4
Jul 28, 2026Walker Karin LChief Accounting OfficerM · Option exerciseDirect15,000——Form 4
Jul 28, 2026Walker Karin LChief Accounting OfficerD · DispositionDirect15,000$8.56$128KForm 4
Jul 28, 2026Zago Wagner M.Chief Scientific OfficerM · Option exerciseDirect51,000——Form 4
Jul 28, 2026Zago Wagner M.Chief Scientific OfficerD · DispositionDirect51,000$8.56$437KForm 4
Jul 28, 2026Smith Brandon S.Chief Operating OfficerM · Option exerciseDirect78,000——Form 4
Jul 28, 2026Smith Brandon S.Chief Operating OfficerD · DispositionDirect78,000$8.56$668KForm 4
Jul 28, 2026Swanson Chad J.Chief Development OfficerM · Option exerciseDirect51,000——Form 4
Jul 28, 2026Swanson Chad J.Chief Development OfficerD · DispositionDirect40,800$8.56$349KForm 4
Jul 28, 2026Swanson Chad J.Chief Development OfficerF · Tax withholdingDirect3,467$8.56$30KForm 4
Jul 28, 2026Nguyen TranChief Strategy Officer and CFOM · Option exerciseDirect57,000——Form 4
Jul 28, 2026Nguyen TranChief Strategy Officer and CFOD · DispositionDirect57,000$8.56$488KForm 4
Jul 29, 2026Kingston Anne EvansChief Strategy OfficerS · Sale · 10b5-1Direct7,662$8.47$65KForm 4
Jul 28, 2026Kingston Anne EvansChief Strategy OfficerF · Tax withholding · 10b5-1Direct3,498$8.56$30KForm 4
Jul 28, 2026Kinney Gene G.President and CEOM · Option exerciseDirect84,000——Form 4
Jul 28, 2026Kinney Gene G.President and CEOD · DispositionDirect84,000$8.56$719KForm 4
Jul 29, 2026Isaacs Michael JohnGeneral Counsel & Company Sec.S · Sale · 10b5-1Direct8,386$8.47$71KForm 4
Jul 28, 2026Isaacs Michael JohnGeneral Counsel & Company Sec.F · Tax withholding · 10b5-1Direct4,694$8.56$40KForm 4

PRTA insider trading FAQ

Are insiders buying PRTA stock?

Yes. In the last 90 days, Prothena Corp Public Ltd Co insiders made 12 open-market purchases totaling $7.76M, and no open-market sales. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).

Who are the insiders trading PRTA?

Recent buyers: Scully William P.

Where does PRTA insider trading data come from?

Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.

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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.