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PROTHENA CORP PUBLIC LTD CO — Investor Relations & Filings

Ticker · PRTA ISIN · USG728001086 US Professional, scientific and technical activities
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Filings indexed 958 across all filing types
Latest filing 2026-05-15 Regulatory Filings
Country US United States of America
Listing US PRTA

About PROTHENA CORP PUBLIC LTD CO

https://www.prothena.com/

Prothena Corporation is a late-stage clinical biotechnology company specializing in the science of protein dysregulation. The company leverages its expertise in the biology of misfolded proteins to discover and develop novel therapeutics. Its primary focus is on advancing a diverse pipeline of investigational treatments for neurodegenerative conditions and rare peripheral amyloid diseases. Prothena's scientific approach integrates insights into neurological dysfunction and the mechanisms of protein misfolding to create antibody-based therapies designed to provide clinically meaningful benefits for patients.

Recent filings

Filing Released Lang Actions
8-K
Regulatory Filings
2026-05-15 English
DEF 14A - PROTHENA CORP PUBLIC LTD CO (0001559053) (Filer)
Proxy Solicitation & Information Statement
2026-03-27 English
8-K - PROTHENA CORP PUBLIC LTD CO (0001559053) (Filer)
Transaction in Own Shares Classification · 95% confidence The document is a Form 8-K filed with the SEC, dated February 27, 2026, reporting a share repurchase plan announcement by Prothena Corporation plc. The text explicitly states the announcement of a share repurchase plan up to $100 million, including details about the plan's expiration and conditions. There are no financial statements or detailed financial data included, only the announcement of the share repurchase plan. According to the classification rules, announcements about share repurchase programs fall under 'Transaction in Own Shares' (POS). The document length is 4596 characters, which is sufficient to contain substantive information about the share repurchase plan, not merely a brief notice or a report publication announcement. Therefore, the correct classification is POS with high confidence.
2026-02-27 English
10-K - PROTHENA CORP PUBLIC LTD CO (0001559053) (Filer)
Annual Report FY 2025
2026-02-27 English
8-K - PROTHENA CORP PUBLIC LTD CO (0001559053) (Filer)
Earnings Release Classification · 95% confidence The document is a Form 8-K filed with the SEC, which is a current report used to announce major events. The text states that the company issued a press release announcing financial results for the fourth quarter and fiscal year ended December 31, 2025, and that the press release is furnished as an exhibit. The document itself does not contain detailed financial statements or comprehensive analysis but rather references the press release. The length is 4135 characters, which is relatively short and consistent with an announcement rather than a full report. According to the rules, such a document is classified as an Earnings Release (ER) because it is the initial announcement of quarterly/fiscal financial results with key highlights only, not the full annual report or detailed financial statements.
2026-02-19 English
8-K
Board/Management Information Classification · 100% confidence The document is a Form 8-K filed with the SEC, which is used for current reports to announce major events that shareholders should know about. The key content is in Item 5.02, which announces the resignation of a director from the Board of Directors effective December 31, 2025. This is a clear announcement of a change in the company's board of directors. The document length is 3815 characters, which is relatively short and focused on this management change. There is no financial data or detailed report content, so it is not an Annual Report, Interim Report, or Earnings Release. The primary subject is a board change, fitting the Board/Management Information category (MANG).
2025-12-12 English

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