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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2026 | Nov 5, 2026 |
| 8-K |
Current report
Agreement ended
|
Oct 29, 2026 | Oct 28, 2026 |
| 8-K |
Current report
Officer or director change
|
Oct 2, 2026 | Oct 2, 2026 |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| 8-K |
Current report
Shareholder vote results
|
May 15, 2026 | May 14, 2026 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 2026 |
| ARS | Annual report to shareholders | Mar 27, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Mar 27, 2026 | — |
| DEF 14A | Proxy statement | Mar 27, 2026 | May 14, 2026 |
| EFFECT | Filing | Mar 2, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Feb 27, 2026 | Feb 27, 2026 |
| POS AM | Filing | Feb 27, 2026 | — |
| 10-K | Annual report | Feb 27, 2026 | Dec 31, 2025 |
| POSASR | Filing | Feb 27, 2026 | — |
| 8-K |
Current report
Results of operations
|
Feb 19, 2026 | Feb 19, 2026 |
| 8-K |
Current report
Officer or director change
|
Dec 12, 2025 | Dec 10, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Nov 19, 2025 | Nov 19, 2025 |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| DEFA14A | Additional proxy material | Nov 6, 2025 | — |
| 8-K |
Current report
Results of operations
|
Nov 6, 2025 | Nov 6, 2025 |
| DEFA14A | Additional proxy material | Oct 7, 2025 | — |
| DEF 14A | Proxy statement | Oct 7, 2025 | Nov 19, 2025 |
| PRE 14A | Preliminary proxy statement | Sep 25, 2025 | Nov 19, 2025 |
| 8-K |
Current report
Other events
|
Aug 27, 2025 | Aug 27, 2025 |
| S-8 | Employee stock plan registration | Aug 8, 2025 | — |
| 8-K |
Current report
Other events
|
Aug 6, 2025 | Aug 6, 2025 |
| 10-Q | Quarterly report | Aug 4, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2025 | Aug 4, 2025 |
| 8-K |
Current report
Officer or director change
|
Jul 30, 2025 | Jul 30, 2025 |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change
|
Jun 18, 2025 | Jun 13, 2025 |
| 8-K |
Current report
Other events
|
Jun 16, 2025 | Jun 15, 2025 |
| 8-K |
Current report
Other events
|
May 23, 2025 | May 23, 2025 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 16, 2025 | May 13, 2025 |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 8, 2025 | May 8, 2025 |
| ARS | Annual report to shareholders | Mar 28, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Mar 28, 2025 | — |
| DEF 14A | Proxy statement | Mar 28, 2025 | May 13, 2025 |
| 10-K | Annual report | Feb 27, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 20, 2025 | Feb 20, 2025 |
| 8-K |
Current report
Officer or director change
|
Dec 30, 2024 | Dec 29, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2024 | Nov 12, 2024 |
| 10-Q | Quarterly report | Nov 12, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Sep 27, 2024 | Sep 23, 2024 |
| S-8 | Employee stock plan registration | Aug 8, 2024 | — |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 8-K |
Current report
Material agreement, Other events
|
May 28, 2024 | May 24, 2024 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 17, 2024 | May 14, 2024 |
| 10-Q | Quarterly report | May 8, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 8, 2024 | May 8, 2024 |
| ARS | Annual report to shareholders | Mar 29, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Mar 29, 2024 | — |
| DEF 14A | Proxy statement | Mar 29, 2024 | May 14, 2024 |
| S-3ASR | Automatic shelf registration | Feb 22, 2024 | — |
| 10-K | Annual report | Feb 22, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Officer or director change
|
Feb 21, 2024 | Feb 21, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 15, 2024 | Feb 15, 2024 |
| 8-K |
Current report
Results of operations, Other events
|
Jan 8, 2024 | Jan 8, 2024 |
| 10-Q | Quarterly report | Nov 2, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2023 | Nov 2, 2023 |
| UPLOAD | Letter from the SEC | Aug 23, 2023 | — |
| CORRESP | Letter to the SEC | Aug 4, 2023 | — |
| S-8 | Employee stock plan registration | Aug 3, 2023 | — |
| 10-Q | Quarterly report | Aug 3, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2023 | Aug 3, 2023 |
| UPLOAD | Letter from the SEC | Jul 25, 2023 | — |
| 8-K |
Current report
Material agreement
|
Jul 10, 2023 | Jul 5, 2023 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 19, 2023 | May 16, 2023 |
| 8-K |
Current report
Officer or director change
|
May 16, 2023 | May 16, 2023 |
| 10-Q | Quarterly report | May 4, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 4, 2023 | May 4, 2023 |
| 8-K |
Current report
Officer or director change
|
Apr 28, 2023 | Apr 25, 2023 |
| ARS | Annual report to shareholders | Mar 31, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Mar 31, 2023 | — |
| DEF 14A | Proxy statement | Mar 31, 2023 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 10, 2023 | Mar 10, 2023 |
| 10-K | Annual report | Feb 28, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 23, 2023 | Feb 23, 2023 |
| 8-K |
Current report
Other events
|
Dec 16, 2022 | Dec 14, 2022 |
| 424B5 | Prospectus supplement | Dec 16, 2022 | — |
| 424B5 | Prospectus supplement | Dec 13, 2022 | — |
| 8-K |
Current report
Other events
|
Nov 21, 2022 | Nov 21, 2022 |
| 10-Q | Quarterly report | Nov 3, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2022 | Nov 3, 2022 |
| 8-K |
Current report
Material agreement
|
Oct 31, 2022 | Oct 28, 2022 |
| 8-K |
Current report
Officer or director change
|
Sep 1, 2022 | Aug 30, 2022 |
| S-8 | Employee stock plan registration | Aug 10, 2022 | — |
| 10-Q | Quarterly report | Aug 8, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2022 | Aug 8, 2022 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 20, 2022 | May 17, 2022 |
| 10-Q | Quarterly report | May 5, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 5, 2022 | May 5, 2022 |
| DEFA14A | Additional proxy material | May 5, 2022 | — |
| 8-K |
Current report
Other events
|
Apr 26, 2022 | Apr 26, 2022 |
| DEFA14A | Additional proxy material | Apr 25, 2022 | — |
| DEFA14A | Additional proxy material | Mar 31, 2022 | — |
| DEF 14A | Proxy statement | Mar 31, 2022 | May 17, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 28, 2022 | Mar 28, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 25, 2022 | Mar 25, 2022 |
| PRE 14A | Preliminary proxy statement | Mar 11, 2022 | May 17, 2022 |
| 10-K | Annual report | Feb 25, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 17, 2022 | Feb 17, 2022 |
| 8-K |
Current report
Other events
|
Dec 23, 2021 | Dec 23, 2021 |
| 424B5 | Prospectus supplement | Dec 23, 2021 | — |
| 10-Q | Quarterly report | Nov 4, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2021 | Nov 4, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 1, 2021 | Sep 29, 2021 |
| S-8 | Employee stock plan registration | Aug 6, 2021 | — |
| 10-Q | Quarterly report | Aug 5, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2021 | Aug 5, 2021 |
| 8-K |
Current report
Material agreement
|
Aug 3, 2021 | Jul 30, 2021 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jul 12, 2021 | Jul 8, 2021 |
| 8-K |
Current report
Other events
|
Jun 24, 2021 | Jun 24, 2021 |
| 8-K |
Current report
Other events
|
May 28, 2021 | May 28, 2021 |
| 424B5 | Prospectus supplement | May 28, 2021 | — |
| 8-K |
Current report
Other events
|
May 28, 2021 | May 28, 2021 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 21, 2021 | May 18, 2021 |
| 8-K |
Current report
Officer or director change
|
May 20, 2021 | May 18, 2021 |
| 10-Q | Quarterly report | May 11, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
May 11, 2021 | May 11, 2021 |
| CT ORDER | Filing | Apr 20, 2021 | — |
| DEFA14A | Additional proxy material | Mar 31, 2021 | — |
| DEF 14A | Proxy statement | Mar 31, 2021 | May 18, 2021 |
| 8-K |
Current report
Other events
|
Mar 26, 2021 | Mar 23, 2021 |
| 424B5 | Prospectus supplement | Mar 24, 2021 | — |
| 424B5 | Prospectus supplement | Mar 23, 2021 | — |
| S-3ASR | Automatic shelf registration | Mar 23, 2021 | — |
| PRE 14A | Preliminary proxy statement | Mar 15, 2021 | May 18, 2021 |
| 10-K | Annual report | Feb 26, 2021 | Dec 31, 2020 |
| SC TO-I/A | Amendment no. 5 to sc to-i | Feb 16, 2021 | — |
| 8-K |
Current report
Results of operations
|
Feb 11, 2021 | Feb 11, 2021 |
| SC TO-I/A | Amendment no. 4 to sc to-i | Feb 5, 2021 | — |
| 8-K |
Current report
Other events
|
Feb 1, 2021 | Feb 1, 2021 |
| SC TO-I/A | Amendment no. 3 to sc to-i | Jan 28, 2021 | — |
| SC TO-I/A | Amendment no. 2 to sc to-i | Jan 21, 2021 | — |
| 8-K |
Current report
Other events
|
Dec 9, 2020 | Dec 9, 2020 |
| SC TO-I/A | Amendment no. 1 to sc to-i | Dec 4, 2020 | — |
| SC TO-I | Filing | Nov 9, 2020 | — |
| 10-Q | Quarterly report | Nov 4, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 4, 2020 | Nov 4, 2020 |
| 8-K |
Current report
Other events
|
Oct 20, 2020 | Oct 20, 2020 |
| S-8 | Employee stock plan registration | Aug 11, 2020 | — |
| 10-Q | Quarterly report | Aug 6, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2020 | Aug 6, 2020 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
May 22, 2020 | May 19, 2020 |
| 10-Q | Quarterly report | May 6, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations
|
May 6, 2020 | May 6, 2020 |
| DEFA14A | Additional proxy material | Apr 24, 2020 | — |
| DEFA14A | Additional proxy material | Mar 25, 2020 | — |
| DEF 14A | Proxy statement | Mar 25, 2020 | May 19, 2020 |
| PRE 14A | Preliminary proxy statement | Mar 12, 2020 | May 19, 2020 |
| 10-K | Annual report | Mar 3, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations
|
Feb 12, 2020 | Feb 12, 2020 |
| 8-K |
Current report
Other events
|
Dec 19, 2019 | Dec 19, 2019 |
| EFFECT | Filing | Dec 12, 2019 | — |
| CORRESP | Letter to the SEC | Dec 10, 2019 | — |
| 8-K |
Current report
Officer or director change
|
Dec 5, 2019 | Dec 3, 2019 |
| S-3/A | Amendment no. 1 to form s-3 | Nov 27, 2019 | — |
| 10-Q | Quarterly report | Nov 5, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2019 | Nov 5, 2019 |
| 8-K/A |
Amended current report
Officer or director change
|
Oct 30, 2019 | Oct 29, 2019 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Sep 24, 2019 | Sep 24, 2019 |
| 8-K/A |
Amended current report
Officer or director change
|
Sep 20, 2019 | Sep 18, 2019 |
| 10-Q | Quarterly report | Aug 6, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2019 | Aug 6, 2019 |
| UPLOAD | Letter from the SEC | Jul 31, 2019 | — |
| CT ORDER | Filing | Jul 12, 2019 | — |
| 8-K |
Current report
Officer or director change
|
Jul 3, 2019 | Jul 1, 2019 |
| CORRESP | Letter to the SEC | Jun 26, 2019 | — |
| CORRESP | Letter to the SEC | Jun 18, 2019 | — |
| CORRESP | Letter to the SEC | Jun 7, 2019 | — |
| UPLOAD | Letter from the SEC | May 29, 2019 | — |
| UPLOAD | Letter from the SEC | May 29, 2019 | — |
| 8-K |
Current report
Shareholder vote results
|
May 24, 2019 | May 21, 2019 |
| S-3 | Shelf registration | May 22, 2019 | — |
| 10-Q | Quarterly report | May 7, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations
|
May 7, 2019 | May 7, 2019 |
| 8-K |
Current report
Other events
|
Apr 18, 2019 | Apr 18, 2019 |
| CORRESP | Letter to the SEC | Apr 17, 2019 | — |
| UPLOAD | Letter from the SEC | Apr 4, 2019 | — |
| DEFA14A | Additional proxy material | Mar 28, 2019 | — |
| DEF 14A | Proxy statement | Mar 28, 2019 | May 21, 2019 |
| CT ORDER | Filing | Mar 28, 2019 | — |
| 10-K | Annual report | Mar 15, 2019 | Dec 31, 2018 |
| CORRESP | Letter to the SEC | Feb 28, 2019 | — |
| 8-K |
Current report
Results of operations
|
Feb 14, 2019 | Feb 14, 2019 |
| CORRESP | Letter to the SEC | Jan 22, 2019 | — |
| CORRESP | Letter to the SEC | Jan 3, 2019 | — |
| UPLOAD | Letter from the SEC | Dec 19, 2018 | — |
| 8-K |
Current report
Officer or director change
|
Dec 14, 2018 | Dec 11, 2018 |
| 10-Q | Quarterly report | Nov 6, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2018 | Nov 6, 2018 |
| 8-K |
Current report
Material agreement
|
Sep 28, 2018 | Sep 24, 2018 |
| CT ORDER | Filing | Aug 22, 2018 | — |
| 10-Q/A | Amended quarterly report | Aug 17, 2018 | Mar 31, 2018 |
| S-8 | Employee stock plan registration | Aug 9, 2018 | — |
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)
Other Pharmaceutical Preparations companies
- ELI LILLY & Co LLY
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.