{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-21-237716","form_type":"8-K","ticker":"GH","cik":"0001576280","company_name":"Guardant Health, Inc.","filed_at":"2021-08-05T23:59:59+00:00","discovered_at":"2026-05-14T18:04:18.645298+00:00","generated_at":"2026-06-29T21:39:45.086821+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"Guardant Health names co-CEOs, splits oncology and screening groups; adds Meghan Joyce to board","bullets":["Helmy Eltoukhy and AmirAli Talasaz appointed co-CEOs effective Aug 5, 2021; Eltoukhy becomes Chairman.","Talasaz steps down as COO but remains President; Eltoukhy leads oncology, Talasaz screening division.","Meghan Joyce, Oscar Health COO/EVP, named independent director; joined audit and compensation committees.","Joyce received initial stock option and RSU awards each valued at $362,500 under director compensation plan.","Company plans blood-based screening LDT launch in 2022 and cites recent launches of Reveal, TissueNext, Response."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-21-237716","json":"https://secwatch.observer/filing/0001193125-21-237716.json","markdown":"https://secwatch.observer/filing/0001193125-21-237716.md","text":"https://secwatch.observer/filing/0001193125-21-237716.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1576280/000119312521237716/0001193125-21-237716-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1576280/000119312521237716/d212126d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-29T21:39:45.086821+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":"7485b36617","claim":"Meghan Joyce was appointed as Class II director at Guardant Health, Inc..","evidence_excerpt":"the Board increased the number of directors on the Board to eight and appointed Meghan Joyce as a Class II director","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1576280/000119312521237716/0001193125-21-237716-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Class II director"}],"fact_type":"executive_change"},{"claim_id":"8e6ef817fa","claim":"Helmy Eltoukhy changed role as Co-Chief Executive Officer at Guardant Health, Inc..","evidence_excerpt":"changed the title of Helmy Eltoukhy, the Company’s current Chief Executive Officer, to the Company’s Co-CEO","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1576280/000119312521237716/0001193125-21-237716-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"changed title"},{"label":"Role","value":"Co-Chief Executive Officer"}],"fact_type":"executive_change"},{"claim_id":"b64ed44efb","claim":"AmirAli Talasaz resigned as Chief Operating Officer at Guardant Health, Inc..","evidence_excerpt":"Dr. Talasaz has also announced his intent to resign from his position as Chief Operating Officer of the Company","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1576280/000119312521237716/0001193125-21-237716-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Chief Operating Officer"}],"fact_type":"executive_change"},{"claim_id":"c58719f805","claim":"AmirAli Talasaz was appointed as Co-Chief Executive Officer at Guardant Health, Inc..","evidence_excerpt":"the Company appointed AmirAli Talasaz as the Company’s Co-CEO","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1576280/000119312521237716/0001193125-21-237716-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Co-Chief Executive Officer"}],"fact_type":"executive_change"},{"claim_id":"cfe06b72bf","claim":"AmirAli Talasaz resigned as Chairperson of the Board at Guardant Health, Inc..","evidence_excerpt":"Dr. Talasaz announced his intent to resign from his position as Chairperson of the Board","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1576280/000119312521237716/0001193125-21-237716-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Chairperson of the Board"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}