{"schema_version":"secwatch.filing_event.v1","accession":"0001595974-26-000032","form_type":"8-K","ticker":"MGNI","cik":"0001595974","company_name":"MAGNITE, INC.","filed_at":"2026-09-21T21:05:19+00:00","discovered_at":"2026-09-21T21:06:00.560417+00:00","generated_at":"2026-09-21T21:06:09.399573+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.6,"calibrated_materiality_score":0.6,"confidence":"high","headline":"Magnite promotes Brian Gephart to CFO, Haas Sullivan to CAO, effective Oct 1, 2026","bullets":["Brian Gephart, CAO since June 2021, becomes CFO on Oct 1, 2026, succeeding retiring David Day (10-year tenure).","Gephart receives equity award worth $2.25M: 70% RSUs ($1.575M) vesting over 4 years with 1-year cliff; 30% PSUs ($675k) granted in 2027.","Haas Sullivan, VP of Accounting since April 2020, becomes CAO on Oct 1, 2026; gets RSUs valued at ~$600k, 4-year vest, 1-year cliff.","Both appointments trigger amended or new Executive Severance Agreements; Gephart gets 12-month severance terms, Sullivan 3-month (6-month on sale).","Prior roles: Gephart was CFO of Leaf Group; Sullivan held VP Accounting at Magnite and audit at Deloitte."],"urls":{"canonical":"https://secwatch.observer/filing/0001595974-26-000032","json":"https://secwatch.observer/filing/0001595974-26-000032.json","markdown":"https://secwatch.observer/filing/0001595974-26-000032.md","text":"https://secwatch.observer/filing/0001595974-26-000032.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1595974/000159597426000032/0001595974-26-000032-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1595974/000159597426000032/mgni-20260921.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-09-21T21:06:09.399573+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":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}