---
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"
generated_at: "2026-06-25T07:31:15.942758+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# MacroGenics appoints William Heiden as Board Chair, replacing Paulo Costa

## Summary
- 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).

## SEC filing metadata
- 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
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 7.01, 9.01
- 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

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001125345-22-000070
- JSON: https://secwatch.observer/filing/0001125345-22-000070.json
- Plain text: https://secwatch.observer/filing/0001125345-22-000070.txt

## Key facts
- Executive change
  Paulo Costa departed as Director at MACROGENICS INC.
  - Action: term expired
  - Role: Director
  source text: 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_url: https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm
- Executive change
  William K. Heiden was appointed as Director at MACROGENICS INC.
  - Action: appointed
  - Role: Director
  source text: approved the appointment of William K. Heiden to serve as a director on the Board, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm
- Executive change
  William K. Heiden was appointed as non-executive Chair of the Board at MACROGENICS INC.
  - Action: appointed
  - Role: non-executive Chair of the Board
  source text: Mr. Heiden has been appointed to serve as non-executive Chair of the Board, effective immediately, replacing Mr. Paulo Costa
  evidence_url: https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm
- Executive change
  Paulo Costa departed as Chair of the Board at MACROGENICS INC.
  - Action: term expired
  - Role: Chair of the Board
  source text: replacing Mr. Paulo Costa, who served in such position until his term as a director expired on May 19, 2022
  evidence_url: https://www.sec.gov/Archives/edgar/data/1125345/000112534522000070/0001125345-22-000070-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.