PRTA Prothena Corporation PLC
Health Care, filed as PROTHENA CORP PLC (SHS), Equity As of 2026 Q2 among managers we track Quote on Google Finance, opens in a new tab
In 2026 Q2 Palo Alto Investors trimmed Prothena.
Who owns this now
Largest portfolio weights among holders, up to 1.6% (Palo Alto Investors). Not free-float ownership.
Who owns PRTA
Sorted by value, long equity only, as of 2026 Q2.
| History | |||||
|---|---|---|---|---|---|
| Palo Alto Investors | Reduce −5.4% | 1,143,155 | $11M | History |
Insider trades
Open-market buys and sales by PRTA's executives, directors and 10% owners in the last 12 months, from their Form 4s
- $12.1M bought by 1 insider
- None no sales outside a trading plan
- $136K sold by 2 insiders under 10b5-1 plans
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William P Scully 10% ownerBuy$1.2M 150,000 shares at $8.15 +15% to stakeTraded Oct 22–23 Filed Oct 26
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William P Scully 10% ownerBuy$920K 110,000 shares at $8.36 +12% to stakeTraded Oct 13–14 Filed Oct 15
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William P Scully 10% ownerBuy$1.8M 215,000 shares at $8.47 +69% to stakeTraded Oct 7–8 Filed Oct 9
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William P Scully 10% ownerBuy$857K 100,000 shares at $8.57 +47% to stakeTraded Oct 2 Filed Oct 6
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William P Scully 10% ownerBuy$1.4M 162,000 shares at $8.68 +312% to stakeTraded Sep 29 Filed Sep 30
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William P Scully 10% ownerBuy$890K 103,500 shares at $8.60 +124% to stakeTraded Sep 28 Filed Sep 29
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William P Scully 10% ownerBuy$843K 100,000 shares at $8.43 +12% to stakeTraded Sep 18 Filed Sep 21
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William P Scully 10% ownerBuy$256K 27,000 shares at $9.47 +3.4% to stakeTraded Sep 2 Filed Sep 3
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William P Scully 10% ownerBuy$439K 50,000 shares at $8.79 +6.7% to stakeTraded Aug 20 Filed Aug 21
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William P Scully 10% ownerBuy$323K 37,500 shares at $8.62Traded Aug 7 Filed Aug 10
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Anne Evans Kingston Chief Strategy OfficerPlanned sale$65K 7,662 shares at $8.47 12% of stakeTraded Jul 29 Filed Jul 30
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Michael John Isaacs General Counsel & Company Sec.Planned sale$71K 8,386 shares at $8.47 19% of stakeTraded Jul 29 Filed Jul 30
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William P Scully 10% ownerBuy$158K 20,000 shares at $7.90 +2.7% to stakeTraded Jun 16 Filed Jun 18
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William P Scully 10% ownerBuy$1M 125,000 shares at $8.17 +13% to stakeTraded Jun 11 Filed Jun 12
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William P Scully 10% ownerBuy$465K 50,000 shares at $9.31 +5.6% to stakeTraded Jun 4 Filed Jun 5
Also filed in the last 12 months, not counted as buying or selling: 6 sales back to the company, 6 option exercises, 5 gifts, and 3 share withholdings for taxes.
SEC filings
Recent issuer filings from EDGAR, 8 shown.
Financials
US-GAAP annual figures by fiscal year, as tagged in Form 10-K. Each value links to its SEC filing.
Income statement
Balance sheet
| Metric | FY2023 | FY2024 | FY2025 |
|---|---|---|---|
| Total current assets | $639.28M | $485.41M | $315.19M |
| Total non-current assets | $57.1M | $61.7M | $11.61M |
| Total assets | $696.38M | $547.11M | $326.8M |
| Total current liabilities | $56.89M | $48.5M | $40.84M |
| Total non-current liabilities | $78.13M | $11.68M | $5.49M |
| Total equity | $561.36M | $486.93M | $280.47M |
Ownership over time
13Fs that reported it each quarter. Click a bar for that quarter’s holders.