---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-24-073821"
form_type: "8-K"
ticker: "ALEC"
cik: "0001653087"
company_name: "Alector, Inc."
filed_at: "2024-03-21T23:59:59+00:00"
generated_at: "2026-06-04T09:54:56.804084+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Alector announces director resignation and appointment of two new board members

## Summary
- Terry McGuire resigns from Board and all committees effective March 20, 2024; personal reasons, no disagreement.
- Errol De Souza, Ph.D. and Mark Altmeyer appointed to Board on March 19, 2024.
- De Souza as Class II director (term to 2026 annual meeting); Altmeyer as Class III (term to 2024 annual meeting).
- Board size increased to ten then reduced to nine after McGuire's resignation.
- Each new director receives initial equity: option for 19,420 shares and RSU for 41,250 shares, vesting over time.

## SEC filing metadata
- accession: 0001193125-24-073821
- form_type: 8-K
- ticker: ALEC
- cik: 0001653087
- company_name: Alector, Inc.
- filed_at: 2024-03-21T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1653087/000119312524073821/0001193125-24-073821-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1653087/000119312524073821/d773925d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-24-073821
- JSON: https://secwatch.observer/filing/0001193125-24-073821.json
- Plain text: https://secwatch.observer/filing/0001193125-24-073821.txt

## Key facts
- Executive change
  Errol De Souza, Ph.D. was appointed as Director at Alector, Inc..
  - Action: appointed
  - Role: Director
  source text: On March 19, 2024 (the “Appointment Date”), each of Errol De Souza, Ph.D. and Mark Altmeyer was appointed to the Board.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1653087/000119312524073821/0001193125-24-073821-index.htm
- Executive change
  Terry McGuire resigned as Director at Alector, Inc..
  - Action: resigned
  - Role: Director
  source text: On March 15, 2024, Terry McGuire informed Alector, Inc. (the “Company”) of his resignation as a member of the Board of Directors (the “Board”) and all committees and subcommittees thereof, effective close of business March 20, 2024.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1653087/000119312524073821/0001193125-24-073821-index.htm
- Executive change
  Mark Altmeyer was appointed as Director at Alector, Inc..
  - Action: appointed
  - Role: Director
  source text: On March 19, 2024 (the “Appointment Date”), each of Errol De Souza, Ph.D. and Mark Altmeyer was appointed to the Board.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1653087/000119312524073821/0001193125-24-073821-index.htm

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