secwatch.observer — SEC 8-K summary ====================================== Issuer: PROTHENA CORP PUBLIC LTD CO (PRTA) CIK: 0001559053 Form: 8-K Filed at: 2026-10-02T20:17:50+00:00 Accession: 0001559053-26-000024 Event type: leadership Sentiment: neutral Materiality: 0.35 Item codes: 5.02, 9.01 LLM model: deepseek-v4.1-flash:cloud@v2 Prothena Chief Development Officer Chad Swanson resigns Oct 9 to join a strategic partner -------------------------------------------------------------------------------- - Chad J. Swanson, Ph.D., Chief Development Officer, notified Prothena on October 2, 2026 that he is resigning effective October 9, 2026. - Swanson is leaving to accept a position with one of the Company's strategic partners, according to the filing. - In the new role he will assume a leadership role over a program partnered with Prothena. - No successor or interim Chief Development Officer was named in the filing. Source: EDGAR index: https://www.sec.gov/Archives/edgar/data/1559053/000155905326000024/0001559053-26-000024-index.htm Primary doc: https://www.sec.gov/Archives/edgar/data/1559053/000155905326000024/prta-20261002.htm HTML page: https://secwatch.observer/filing/0001559053-26-000024 License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer