Prothena Corp Public Ltd Co SEC filings PRTA
Prothena Corp Public Ltd Co has 1,006 filings in SEC EDGAR's recent list, going back to Jan 31, 2013. Its latest annual report, Form ARS, was filed on Mar 27, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 5, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Oct 29, 2026 | Oct 27, 2026 |
| 4 | Insider transaction | Oct 26, 2026 | Oct 22, 2026 |
| 4 | Insider transaction | Oct 15, 2026 | Oct 13, 2026 |
| 4 | Insider transaction | Oct 9, 2026 | Oct 7, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 4 | Insider transaction | Sep 30, 2026 | Sep 29, 2026 |
| 4 | Insider transaction | Sep 29, 2026 | Sep 28, 2026 |
| 4 | Insider transaction | Sep 21, 2026 | Sep 18, 2026 |
| 4 | Insider transaction | Sep 3, 2026 | Sep 2, 2026 |
| 4 | Insider transaction | Aug 21, 2026 | Aug 20, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 19, 2026 | — |
| 3 | Initial insider ownership | Aug 18, 2026 | Aug 18, 2026 |
| 4 | Insider transaction | Aug 18, 2026 | Aug 18, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| 4 | Insider transaction | Aug 11, 2026 | Aug 10, 2026 |
| 3 | Initial insider ownership | Aug 11, 2026 | Aug 6, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 7, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 6, 2026 | — |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 4 | Insider transaction | Jul 30, 2026 | Jul 28, 2026 |
| 144 | Notice of proposed sale | Jul 29, 2026 | — |
| 144 | Notice of proposed sale | Jul 29, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 29, 2026 | — |
| 4 | Insider transaction | Jun 18, 2026 | Jun 16, 2026 |
| 4 | Insider transaction | Jun 16, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 3 | Initial insider ownership | Jun 12, 2026 | Jun 8, 2026 |
| 144 | Notice of proposed sale | Jun 9, 2026 | — |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 2, 2026 |
| 4 | Insider transaction | May 26, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 15, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 15, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 15, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 15, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 15, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 15, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| 3 | Initial insider ownership | May 14, 2026 | May 7, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 11, 2026 | — |
| 4 | Insider transaction | Apr 10, 2026 | Apr 10, 2026 |
| 3 | Initial insider ownership | Apr 10, 2026 | Apr 10, 2026 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Mar 5, 2026 | Mar 3, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 13, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 17, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2025 | — |
| 4 | Insider transaction | Jul 30, 2025 | Jul 28, 2025 |
| 4 | Insider transaction | Jul 30, 2025 | Jul 28, 2025 |
| 4 | Insider transaction | Jul 30, 2025 | Jul 28, 2025 |
| 4 | Insider transaction | Jul 30, 2025 | Jul 28, 2025 |
| 4 | Insider transaction | Jul 30, 2025 | Jul 28, 2025 |
| 4 | Insider transaction | Jul 30, 2025 | Jul 28, 2025 |
| 4 | Insider transaction | Jul 30, 2025 | Jul 28, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jun 5, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 4, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 29, 2025 | — |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| 4 | Insider transaction | May 16, 2025 | May 14, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 6, 2025 | — |
| 4 | Insider transaction | May 6, 2025 | May 2, 2025 |
| 4 | Insider transaction | May 2, 2025 | Dec 18, 2024 |
| 3 | Initial insider ownership | May 1, 2025 | Dec 17, 2024 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 21, 2025 | — |
| 4 | Insider transaction | Feb 14, 2025 | Apr 8, 2020 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 10, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jan 3, 2025 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 8, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 7, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 18, 2024 | — |
| 4 | Insider transaction | Oct 3, 2024 | Oct 1, 2024 |
| 3 | Initial insider ownership | Oct 3, 2024 | Sep 27, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | Mar 5, 2024 | Mar 1, 2024 |
| 3 | Initial insider ownership | Mar 5, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Feb 29, 2024 | Feb 27, 2024 |
| 4 | Insider transaction | Feb 29, 2024 | Feb 27, 2024 |
| 4 | Insider transaction | Feb 29, 2024 | Feb 27, 2024 |
| 4 | Insider transaction | Feb 29, 2024 | Feb 27, 2024 |
| 4 | Insider transaction | Feb 29, 2024 | Feb 27, 2024 |
| 4 | Insider transaction | Feb 29, 2024 | Feb 27, 2024 |
| 4 | Insider transaction | Feb 29, 2024 | Feb 27, 2024 |
| 4 | Insider transaction | Feb 29, 2024 | Feb 27, 2024 |
| 4 | Insider transaction | Feb 23, 2024 | Feb 21, 2024 |
| 3 | Initial insider ownership | Feb 23, 2024 | Feb 21, 2024 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 2, 2024 | — |
| 4 | Insider transaction | Jan 24, 2024 | Jan 24, 2024 |
| 144 | Notice of proposed sale | Jan 24, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Jan 24, 2024 | — |
| 4 | Insider transaction | Dec 20, 2023 | Dec 20, 2023 |
| 144 | Notice of proposed sale | Dec 20, 2023 | — |
| 4 | Insider transaction | Nov 30, 2023 | Nov 30, 2023 |
| 144 | Notice of proposed sale | Nov 30, 2023 | — |
| 4 | Insider transaction | Oct 25, 2023 | Oct 25, 2023 |
| 144 | Notice of proposed sale | Oct 25, 2023 | — |
| 4 | Insider transaction | Oct 11, 2023 | Oct 11, 2023 |
| 144 | Notice of proposed sale | Oct 11, 2023 | — |
| 4 | Insider transaction | Oct 4, 2023 | Oct 4, 2023 |
| 144 | Notice of proposed sale | Oct 4, 2023 | — |
| 4 | Insider transaction | Sep 27, 2023 | Sep 27, 2023 |
| 144 | Notice of proposed sale | Sep 27, 2023 | — |
| 144 | Notice of proposed sale | Sep 25, 2023 | — |
| 4 | Insider transaction | Sep 19, 2023 | Sep 19, 2023 |
| 144 | Notice of proposed sale | Sep 19, 2023 | — |
| 4 | Insider transaction | Sep 13, 2023 | Sep 13, 2023 |
| 4 | Insider transaction | Sep 13, 2023 | Sep 13, 2023 |
| 144 | Notice of proposed sale | Sep 13, 2023 | — |
| 144 | Notice of proposed sale | Sep 13, 2023 | — |
| 4 | Insider transaction | Sep 6, 2023 | Sep 6, 2023 |
| 144 | Notice of proposed sale | Sep 6, 2023 | — |
| 4 | Insider transaction | Aug 30, 2023 | Aug 30, 2023 |
| 144 | Notice of proposed sale | Aug 30, 2023 | — |
| 4 | Insider transaction | Aug 18, 2023 | Aug 18, 2023 |
| 144 | Notice of proposed sale | Aug 18, 2023 | — |
| 4 | Insider transaction | Aug 16, 2023 | Aug 16, 2023 |
| 4 | Insider transaction | Aug 16, 2023 | Aug 16, 2023 |
| 144 | Notice of proposed sale | Aug 16, 2023 | — |
| 144 | Notice of proposed sale | Aug 16, 2023 | — |
| 4 | Insider transaction | Aug 2, 2023 | Aug 2, 2023 |
| 4 | Insider transaction | Aug 2, 2023 | Aug 2, 2023 |
| 144 | Notice of proposed sale | Aug 2, 2023 | — |
| 144 | Notice of proposed sale | Aug 2, 2023 | — |
| 4 | Insider transaction | Jul 26, 2023 | Jul 26, 2023 |
| 144 | Notice of proposed sale | Jul 26, 2023 | — |
| 4 | Insider transaction | Jul 19, 2023 | Jul 19, 2023 |
| 144 | Notice of proposed sale | Jul 19, 2023 | — |
| 4 | Insider transaction | Jul 12, 2023 | Jul 12, 2023 |
| 4 | Insider transaction | Jul 12, 2023 | Jul 12, 2023 |
| 144 | Notice of proposed sale | Jul 12, 2023 | — |
| 144 | Notice of proposed sale | Jul 12, 2023 | — |
| 4 | Insider transaction | Jul 5, 2023 | Jul 5, 2023 |
| 4 | Insider transaction | Jul 5, 2023 | Jul 5, 2023 |
| 144 | Notice of proposed sale | Jul 5, 2023 | — |
| 144 | Notice of proposed sale | Jul 5, 2023 | — |
| 4 | Insider transaction | Jul 3, 2023 | Jul 3, 2023 |
| 144 | Notice of proposed sale | Jul 3, 2023 | — |
| 4 | Insider transaction | Jun 28, 2023 | Jun 28, 2023 |
| 144 | Notice of proposed sale | Jun 28, 2023 | — |
| 4 | Insider transaction | Jun 20, 2023 | Jun 20, 2023 |
| 144 | Notice of proposed sale | Jun 20, 2023 | — |
| 4 | Insider transaction | Jun 16, 2023 | Jun 16, 2023 |
| 144 | Notice of proposed sale | Jun 16, 2023 | — |
| 4 | Insider transaction | Jun 14, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 14, 2023 | Jun 14, 2023 |
| 144 | Notice of proposed sale | Jun 14, 2023 | — |
| 144 | Notice of proposed sale | Jun 14, 2023 | — |
| 144 | Notice of proposed sale | Jun 14, 2023 | — |
| 4 | Insider transaction | Jun 7, 2023 | Jun 7, 2023 |
| 4 | Insider transaction | Jun 7, 2023 | Jun 7, 2023 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- PRTA (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- Ireland
- Headquarters
- Dublin 2, Ireland
- SEC filer status
- Accelerated filer
- SEC CIK
- 1559053
- Former names
- Prothena Corp plc (until May 22, 2020); Neotope Corp Ltd (until Oct 1, 2012)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.