{"schema_version":"secwatch.filing_event.v1","accession":"0001819142-23-000078","form_type":"8-K","ticker":"SES","cik":"0001819142","company_name":"SES AI Corp","filed_at":"2023-09-22T23:59:59+00:00","discovered_at":"2026-05-14T18:03:35.418413+00:00","generated_at":"2026-06-10T09:49:35.074476+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"SES AI CTO Yongkyu Son resigns effective Sept 30; interim team assigned","bullets":["Yongkyu Son resigned as CTO effective Sept 30, 2023, citing personal reasons.","No disagreement with management, board, operations, policies, or practices.","Hong Gan (Chief Science Officer) and Daniel Li (Chief Manufacturing Officer) assume interim CTO responsibilities.","Company has commenced a search for a permanent successor."],"urls":{"canonical":"https://secwatch.observer/filing/0001819142-23-000078","json":"https://secwatch.observer/filing/0001819142-23-000078.json","markdown":"https://secwatch.observer/filing/0001819142-23-000078.md","text":"https://secwatch.observer/filing/0001819142-23-000078.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1819142/000181914223000078/0001819142-23-000078-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1819142/000181914223000078/ses-20230919x8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-10T09:49:35.074476+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":"3b68fedf69","claim":"Yongkyu Son resigned as Chief Technology Officer at SES AI Corp.","evidence_excerpt":"On September 19, 2023, Yongkyu Son informed SES AI Corporation (the “Company”) of his decision to resign from his position as Chief Technology Officer of the Company, effective September 30, 2023.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1819142/000181914223000078/0001819142-23-000078-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Chief Technology Officer"}],"fact_type":"executive_change"},{"claim_id":"8f7ea4978d","claim":"Hong Gan changed role as Interim Chief Technology Officer at SES AI Corp.","evidence_excerpt":"Mr. Son’s prior responsibilities shall be assumed by Hong Gan and Daniel Li, the Company’s Chief Science Officer and Chief Manufacturing Officer, respectively.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1819142/000181914223000078/0001819142-23-000078-index.htm","confidence":0.9,"family_label":"Executive change","details":[{"label":"Action","value":"assumed interim CTO responsibilities"},{"label":"Role","value":"Interim Chief Technology Officer"}],"fact_type":"executive_change"},{"claim_id":"b9dcb1e124","claim":"Daniel Li changed role as Interim Chief Technology Officer at SES AI Corp.","evidence_excerpt":"Mr. Son’s prior responsibilities shall be assumed by Hong Gan and Daniel Li, the Company’s Chief Science Officer and Chief Manufacturing Officer, respectively.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1819142/000181914223000078/0001819142-23-000078-index.htm","confidence":0.9,"family_label":"Executive change","details":[{"label":"Action","value":"assumed interim CTO responsibilities"},{"label":"Role","value":"Interim Chief Technology Officer"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}