{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-25-142725","form_type":"8-K","ticker":"PRTA","cik":"0001559053","company_name":"PROTHENA CORP PUBLIC LTD CO","filed_at":"2025-06-18T23:59:59+00:00","discovered_at":"2026-05-14T18:02:48.757020+00:00","generated_at":"2026-05-19T02:55:08.877359+00:00","sec_items":["2.05","5.02"],"event_type":"leadership","sentiment":"negative","materiality_score":0.78,"calibrated_materiality_score":0.78,"confidence":"high","headline":"Prothena cuts 63% of workforce, expects $16-20M severance costs; two C-suite execs to leave Aug 1","bullets":["Workforce reduction of ~63% to cut operating costs; substantially complete by Q4 2025.","Expected severance and benefits $16-20M plus non-cash stock option acceleration.","Chief Regulatory Officer Carol D. Karp and Chief People Officer David A. Ford to depart Aug 1, 2025.","Follows May 23 decision to discontinue birtamimab development."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-25-142725","json":"https://secwatch.observer/filing/0001193125-25-142725.json","markdown":"https://secwatch.observer/filing/0001193125-25-142725.md","text":"https://secwatch.observer/filing/0001193125-25-142725.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1559053/000119312525142725/0001193125-25-142725-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1559053/000119312525142725/d945146d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-19T02:55:08.877359+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"0662d93ff0","claim":"Carol D. Karp was terminated as Chief Regulatory Officer at PROTHENA CORP PUBLIC LTD CO.","evidence_excerpt":"On June 18, 2025, the Company announced that in connection with the workforce reduction, the employment of Carol D. Karp, the Company’s Chief Regulatory Officer, and David A. Ford, the Company’s Chief People Officer, will terminate effective August 1, 2025.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1559053/000119312525142725/0001193125-25-142725-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"terminated"},{"label":"Role","value":"Chief Regulatory Officer"}],"fact_type":"executive_change"},{"claim_id":"e99042a674","claim":"David A. Ford was terminated as Chief People Officer at PROTHENA CORP PUBLIC LTD CO.","evidence_excerpt":"On June 18, 2025, the Company announced that in connection with the workforce reduction, the employment of Carol D. Karp, the Company’s Chief Regulatory Officer, and David A. Ford, the Company’s Chief People Officer, will terminate effective August 1, 2025.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1559053/000119312525142725/0001193125-25-142725-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"terminated"},{"label":"Role","value":"Chief People Officer"}],"fact_type":"executive_change"},{"claim_id":"45e5f0897925fa9f6bd88890fb26f31add71b75f","claim":"PROTHENA CORP PUBLIC LTD CO announced a restructuring with charges of approximately $16 to $20 million (approximate 63% reduction in its workforce).","evidence_excerpt":"periods will be extended, pursuant to the terms of the option award agreements under which those stock options were granted. The Company expects to recognize approximately $16 to $20 million in total for severance and related benefits for employees laid off under the reduction in workforce and non-cash share-based compensation expense related to the","evidence_source":"SEC 8-K Item 2.05/2.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/1559053/000119312525142725/0001193125-25-142725-index.htm","confidence":0.9,"family_label":"Restructurings & Charges","details":[{"label":"Type","value":"restructuring"},{"label":"Charge","value":"approximately $16 to $20 million"},{"label":"Headcount","value":"approximate 63% reduction in its workforce"}],"fact_type":"restructuring_charge"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}