{"schema_version":"secwatch.filing_event.v1","accession":"0001125345-22-000070","form_type":"8-K","ticker":"MGNX","cik":"0001125345","company_name":"MACROGENICS INC","filed_at":"2022-05-24T23:59:59+00:00","discovered_at":"2026-05-14T18:03:59.828121+00:00","generated_at":"2026-06-25T07:31:15.942758+00:00","sec_items":["5.02","7.01","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.55,"calibrated_materiality_score":0.55,"confidence":"high","headline":"MacroGenics appoints William Heiden as Board Chair, replacing Paulo Costa","bullets":["William Heiden appointed as non-executive Chair of the Board and director, effective May 22, 2022.","Heiden replaces Paulo Costa, whose term expired at 2022 Annual Meeting on May 19.","Heiden also appointed to Audit Committee; granted option to purchase 36,000 shares at $3.96, vesting monthly over 36 months.","Board now comprises 8 directors, 7 of whom are independent.","Heiden brings 35 years biopharma experience, most recently CEO of AMAG Pharmaceuticals (acquired 2020 for $650M)."],"urls":{"canonical":"https://secwatch.observer/filing/0001125345-22-000070","json":"https://secwatch.observer/filing/0001125345-22-000070.json","markdown":"https://secwatch.observer/filing/0001125345-22-000070.md","text":"https://secwatch.observer/filing/0001125345-22-000070.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/mgnx-20220522.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-25T07:31:15.942758+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":"2a91d43398","claim":"Paulo Costa departed as Director at MACROGENICS INC.","evidence_excerpt":"who served in such position until his term as a director expired on May 19, 2022 upon the conclusion of the 2022 Annual Meeting of Stockholders","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"term expired"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"63fb59c865","claim":"William K. Heiden was appointed as Director at MACROGENICS INC.","evidence_excerpt":"approved the appointment of William K. Heiden to serve as a director on the Board, effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Director"}],"fact_type":"executive_change"},{"claim_id":"8c707bbf17","claim":"William K. Heiden was appointed as non-executive Chair of the Board at MACROGENICS INC.","evidence_excerpt":"Mr. Heiden has been appointed to serve as non-executive Chair of the Board, effective immediately, replacing Mr. Paulo Costa","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"non-executive Chair of the Board"}],"fact_type":"executive_change"},{"claim_id":"efb5301f7a","claim":"Paulo Costa departed as Chair of the Board at MACROGENICS INC.","evidence_excerpt":"replacing Mr. Paulo Costa, who served in such position until his term as a director expired on May 19, 2022","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"term expired"},{"label":"Role","value":"Chair 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"}