{"schema_version":"secwatch.filing_event.v1","accession":"0000950170-23-047138","form_type":"8-K","ticker":"RARE","cik":"0001515673","company_name":"Ultragenyx Pharmaceutical Inc.","filed_at":"2023-09-08T23:59:59+00:00","discovered_at":"2026-05-14T18:03:34.163878+00:00","generated_at":"2026-06-10T22:07:58.957532+00:00","sec_items":["5.02","9.01"],"event_type":"other","sentiment":"neutral","materiality_score":0.1,"calibrated_materiality_score":0.1,"confidence":"high","headline":"Ultragenyx moves CFO start date to Oct 9 from Oct 16, 2023","bullets":["Howard Horn's appointment as CFO & EVP, Corporate Strategy effective October 9, 2023, one week earlier than originally announced.","Amendment No. 1 to offer letter dated September 6, 2023 changes only the start date; all other terms unchanged.","Original effective date of October 16, 2023 was disclosed in the July 12, 2023 Form 8-K."],"urls":{"canonical":"https://secwatch.observer/filing/0000950170-23-047138","json":"https://secwatch.observer/filing/0000950170-23-047138.json","markdown":"https://secwatch.observer/filing/0000950170-23-047138.md","text":"https://secwatch.observer/filing/0000950170-23-047138.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1515673/000095017023047138/0000950170-23-047138-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1515673/000095017023047138/rare-20230906.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-10T22:07:58.957532+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":"72c9ccc2f4","claim":"Howard Horn was appointed as Chief Financial Officer and Executive Vice President, Corporate Strategy at Ultragenyx Pharmaceutical Inc..","evidence_excerpt":"Mr. Horn and the Company have modified the effective date of Mr. Horn’s appointment as the Company’s CFO and EVP, Corporate Strategy from October 16, 2023 to October 9, 2023 (the “Effective Date”).","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1515673/000095017023047138/0000950170-23-047138-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Chief Financial Officer and Executive Vice President, Corporate Strategy"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}